| 1 | /* | |
| 2 | * Copyright 2014-2026 Grzegorz Piwowarek, https://4comprehension.com/ | |
| 3 | * | |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 | * you may not use this file except in compliance with the License. | |
| 6 | * You may obtain a copy of the License at | |
| 7 | * | |
| 8 | * https://www.apache.org/licenses/LICENSE-2.0 | |
| 9 | * | |
| 10 | * Unless required by applicable law or agreed to in writing, software | |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 13 | * See the License for the specific language governing permissions and | |
| 14 | * limitations under the License. | |
| 15 | */ | |
| 16 | package com.pivovarit.collectors; | |
| 17 | ||
| 18 | import java.util.List; | |
| 19 | import java.util.Objects; | |
| 20 | import java.util.concurrent.CompletableFuture; | |
| 21 | import java.util.concurrent.Executor; | |
| 22 | import java.util.function.Function; | |
| 23 | import java.util.stream.Collector; | |
| 24 | import java.util.stream.Stream; | |
| 25 | import org.jspecify.annotations.NullMarked; | |
| 26 | ||
| 27 | /** | |
| 28 | * An umbrella class exposing static factory methods for instantiating parallel {@link Collector}s | |
| 29 | * | |
| 30 | * @author Grzegorz Piwowarek | |
| 31 | */ | |
| 32 | @NullMarked | |
| 33 | public final class ParallelCollectors { | |
| 34 | ||
| 35 | private ParallelCollectors() { | |
| 36 | } | |
| 37 | ||
| 38 | /** | |
| 39 | * A convenience {@link Collector} that performs parallel computations using Virtual Threads | |
| 40 | * and returns a {@link CompletableFuture} containing the result of applying the user-provided | |
| 41 | * {@link Collector} to the mapped elements. | |
| 42 | * <p> | |
| 43 | * Each element is transformed using the provided {@code mapper} in parallel on Virtual Threads, | |
| 44 | * and the results are reduced according to the supplied {@code collector}. | |
| 45 | * | |
| 46 | * <br> | |
| 47 | * Example: | |
| 48 | * <pre>{@code | |
| 49 | * CompletableFuture<List<String>> result = Stream.of(1, 2, 3) | |
| 50 | * .collect(parallel(i -> foo(i), toList())); | |
| 51 | * }</pre> | |
| 52 | * | |
| 53 | * @param mapper transformation applied to each element | |
| 54 | * @param collector the {@code Collector} describing the reduction | |
| 55 | * @param <T> the input element type | |
| 56 | * @param <R> the type produced by {@code mapper} | |
| 57 | * @param <RR> the reduction result type produced by {@code collector} | |
| 58 | * | |
| 59 | * @return a {@code Collector} producing a {@link CompletableFuture} of the reduced result | |
| 60 | * | |
| 61 | * @since 3.0.0 | |
| 62 | */ | |
| 63 | public static <T, R, RR> Collector<T, ?, CompletableFuture<RR>> parallel( | |
| 64 | Function<? super T, ? extends R> mapper, | |
| 65 | Collector<R, ?, RR> collector) { | |
| 66 | ||
| 67 | Objects.requireNonNull(collector, "collector cannot be null"); | |
| 68 |
2
1. parallel : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallel → KILLED 2. lambda$parallel$0 : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::lambda$parallel$0 → KILLED |
return Factory.collecting(s -> s.collect(collector), mapper, Configurer.collecting(c -> {})); |
| 69 | } | |
| 70 | ||
| 71 | /** | |
| 72 | * A convenience {@link Collector} that performs parallel computations by classifying input | |
| 73 | * elements using the provided {@code classifier}, applying the given {@code mapper}, and | |
| 74 | * emitting {@link Grouped} entries representing each batch. | |
| 75 | * <p> | |
| 76 | * The generated {@link Stream} of {@code Grouped<K, R>} instances is then reduced using the | |
| 77 | * user-provided {@code collector}, executed on Virtual Threads. Each group is processed | |
| 78 | * independently, and every batch is guaranteed to be processed on a single thread. | |
| 79 | * The reduction is applied to the grouped results rather than to the raw mapped elements. | |
| 80 | * <br> | |
| 81 | * <br> | |
| 82 | * Example: | |
| 83 | * <pre>{@code | |
| 84 | * CompletableFuture<List<Grouped<String, String>>> result = Stream.of(t1, t2, t3) | |
| 85 | * .collect(parallelBy(Task::groupId, t -> compute(t), toList())); | |
| 86 | * }</pre> | |
| 87 | * | |
| 88 | * @param classifier function that groups elements into batches | |
| 89 | * @param mapper transformation applied to each element | |
| 90 | * @param collector the {@code Collector} describing the reduction for each batch | |
| 91 | * @param <T> the input element type | |
| 92 | * @param <K> the classification key type | |
| 93 | * @param <R> the type produced by {@code mapper} | |
| 94 | * @param <RR> the reduction result type produced by {@code collector} | |
| 95 | * | |
| 96 | * @return a {@code Collector} producing a {@link CompletableFuture} whose value is obtained | |
| 97 | * by reducing the {@code Stream<Grouped<K, R>>} produced by the parallel classification | |
| 98 | * | |
| 99 | * @since 3.4.0 | |
| 100 | */ | |
| 101 | public static <T, K, R, RR> Collector<T, ?, CompletableFuture<RR>> parallelBy( | |
| 102 | Function<? super T, ? extends K> classifier, | |
| 103 | Function<? super T, ? extends R> mapper, | |
| 104 | Collector<Grouped<K, R>, ?, RR> collector) { | |
| 105 | ||
| 106 | Objects.requireNonNull(collector, "collector cannot be null"); | |
| 107 | ||
| 108 |
2
1. parallelBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelBy → KILLED 2. lambda$parallelBy$0 : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::lambda$parallelBy$0 → KILLED |
return Factory.collectingBy(classifier, (Function<Stream<Grouped<K, R>>, RR>) s -> s.collect(collector), mapper, Configurer.collecting(c -> {})); |
| 109 | } | |
| 110 | ||
| 111 | /** | |
| 112 | * A convenience {@link Collector} that performs parallel computations using Virtual Threads | |
| 113 | * and returns a {@link CompletableFuture} containing the result of applying the user-provided | |
| 114 | * {@link Collector} to the mapped elements, with a configurable parallelism level. | |
| 115 | * <p> | |
| 116 | * Each element is transformed using the provided {@code mapper} in parallel on Virtual Threads, | |
| 117 | * and the results are reduced according to the supplied {@code collector}. | |
| 118 | * | |
| 119 | * <br> | |
| 120 | * Example: | |
| 121 | * <pre>{@code | |
| 122 | * CompletableFuture<List<String>> result = Stream.of(1, 2, 3) | |
| 123 | * .collect(parallel(i -> foo(i), toList(), 2)); | |
| 124 | * }</pre> | |
| 125 | * | |
| 126 | * @param mapper transformation applied to each element | |
| 127 | * @param collector the {@code Collector} describing the reduction | |
| 128 | * @param parallelism the maximum degree of parallelism | |
| 129 | * @param <T> the input element type | |
| 130 | * @param <R> the type produced by {@code mapper} | |
| 131 | * @param <RR> the reduction result type produced by {@code collector} | |
| 132 | * | |
| 133 | * @return a {@code Collector} producing a {@link CompletableFuture} of the reduced result | |
| 134 | * | |
| 135 | * @since 3.2.0 | |
| 136 | */ | |
| 137 | public static <T, R, RR> Collector<T, ?, CompletableFuture<RR>> parallel( | |
| 138 | Function<? super T, ? extends R> mapper, | |
| 139 | Collector<R, ?, RR> collector, | |
| 140 | int parallelism) { | |
| 141 | ||
| 142 | Objects.requireNonNull(collector, "collector cannot be null"); | |
| 143 |
2
1. lambda$parallel$2 : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::lambda$parallel$2 → KILLED 2. parallel : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallel → KILLED |
return Factory.collecting(s -> s.collect(collector), mapper, Configurer.collecting(c -> c.parallelism(parallelism))); |
| 144 | } | |
| 145 | ||
| 146 | /** | |
| 147 | * A convenience {@link Collector} that performs parallel computations by classifying input | |
| 148 | * elements using the provided {@code classifier}, applying the given {@code mapper}, and | |
| 149 | * emitting {@link Grouped} entries representing each batch. | |
| 150 | * <p> | |
| 151 | * The generated {@link Stream} of {@code Grouped<K, R>} instances is then reduced using the | |
| 152 | * user-provided {@code collector}, executed on Virtual Threads. Each group is processed | |
| 153 | * independently, and every batch is guaranteed to be processed on a single thread. | |
| 154 | * The reduction is applied to the grouped results rather than to the raw mapped elements. | |
| 155 | * A configurable {@code parallelism} parameter defines the maximum | |
| 156 | * level of concurrent processing. | |
| 157 | * <br> | |
| 158 | * <br> | |
| 159 | * Example: | |
| 160 | * <pre>{@code | |
| 161 | * CompletableFuture<List<Grouped<String, String>>> result = Stream.of(t1, t2, t3) | |
| 162 | * .collect(parallelBy(Task::groupId, t -> compute(t), toList(), 4)); | |
| 163 | * }</pre> | |
| 164 | * | |
| 165 | * @param classifier function that groups elements into batches | |
| 166 | * @param mapper transformation applied to each element | |
| 167 | * @param collector reduction applied to the resulting {@code Stream<Grouped<K, R>>} | |
| 168 | * @param parallelism maximum allowed parallelism | |
| 169 | * @param <T> the input element type | |
| 170 | * @param <K> the classification key type | |
| 171 | * @param <R> the type produced by {@code mapper} | |
| 172 | * @param <RR> the reduction result type produced by {@code collector} | |
| 173 | * | |
| 174 | * @return a {@code Collector} producing a {@link CompletableFuture} whose value is obtained | |
| 175 | * by reducing the {@code Stream<Grouped<K, R>>} produced by the parallel classification | |
| 176 | * | |
| 177 | * @since 3.4.0 | |
| 178 | */ | |
| 179 | public static <T, K, R, RR> Collector<T, ?, CompletableFuture<RR>> parallelBy( | |
| 180 | Function<? super T, ? extends K> classifier, | |
| 181 | Function<? super T, ? extends R> mapper, | |
| 182 | Collector<Grouped<K, R>, ?, RR> collector, | |
| 183 | int parallelism) { | |
| 184 | ||
| 185 | Objects.requireNonNull(collector, "collector cannot be null"); | |
| 186 | ||
| 187 |
2
1. lambda$parallelBy$2 : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::lambda$parallelBy$2 → KILLED 2. parallelBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelBy → KILLED |
return Factory.collectingBy(classifier, (Function<Stream<Grouped<K, R>>, RR>) s -> s.collect(collector), mapper, Configurer.collecting(c -> c.parallelism(parallelism))); |
| 188 | } | |
| 189 | ||
| 190 | /** | |
| 191 | * A convenience {@link Collector} that performs parallel computations on a custom {@link Executor} | |
| 192 | * and returns a {@link CompletableFuture} containing the result of applying the user-provided | |
| 193 | * {@link Collector} to the mapped elements, with a configurable parallelism level. | |
| 194 | * <p> | |
| 195 | * Each element is transformed using the provided {@code mapper} in parallel on the specified | |
| 196 | * {@code executor}, and the results are reduced according to the supplied {@code collector}. | |
| 197 | * | |
| 198 | * <br> | |
| 199 | * Example: | |
| 200 | * <pre>{@code | |
| 201 | * CompletableFuture<List<String>> result = Stream.of(1, 2, 3) | |
| 202 | * .collect(parallel(i -> foo(i), toList(), executor, 2)); | |
| 203 | * }</pre> | |
| 204 | * | |
| 205 | * @param mapper transformation applied to each element | |
| 206 | * @param collector the {@code Collector} describing the reduction | |
| 207 | * @param executor the {@code Executor} used for asynchronous execution | |
| 208 | * @param parallelism the maximum degree of parallelism | |
| 209 | * @param <T> the input element type | |
| 210 | * @param <R> the type produced by {@code mapper} | |
| 211 | * @param <RR> the reduction result type produced by {@code collector} | |
| 212 | * | |
| 213 | * @return a {@code Collector} producing a {@link CompletableFuture} of the reduced result | |
| 214 | * | |
| 215 | * @since 2.0.0 | |
| 216 | */ | |
| 217 | public static <T, R, RR> Collector<T, ?, CompletableFuture<RR>> parallel( | |
| 218 | Function<? super T, ? extends R> mapper, | |
| 219 | Collector<R, ?, RR> collector, | |
| 220 | Executor executor, | |
| 221 | int parallelism) { | |
| 222 | ||
| 223 | Objects.requireNonNull(collector, "collector cannot be null"); | |
| 224 |
2
1. lambda$parallel$4 : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::lambda$parallel$4 → KILLED 2. parallel : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallel → KILLED |
return Factory.collecting(s -> s.collect(collector), mapper, Configurer.collecting(c -> c.executor(executor) |
| 225 | .parallelism(parallelism))); | |
| 226 | } | |
| 227 | ||
| 228 | /** | |
| 229 | * A convenience {@link Collector} that performs parallel computations by classifying input | |
| 230 | * elements using the provided {@code classifier}, applying the given {@code mapper}, and | |
| 231 | * emitting {@link Grouped} entries representing each batch. | |
| 232 | * <p> | |
| 233 | * The generated {@link Stream} of {@code Grouped<K, R>} instances is then reduced using the | |
| 234 | * user-provided {@code collector}, executed on the supplied {@link Executor}. Each group is | |
| 235 | * processed independently, and every batch is guaranteed to be processed on a single thread. | |
| 236 | * The reduction is applied to grouped results rather than to the raw mapped elements. A | |
| 237 | * configurable {@code parallelism} parameter defines the maximum level of concurrent batch | |
| 238 | * execution. | |
| 239 | * <br> | |
| 240 | * <br> | |
| 241 | * Example: | |
| 242 | * <pre>{@code | |
| 243 | * CompletableFuture<List<Grouped<String, String>>> result = Stream.of(t1, t2, t3) | |
| 244 | * .collect(parallelBy(Task::groupId, t -> compute(t), toList(), executor, 4)); | |
| 245 | * }</pre> | |
| 246 | * | |
| 247 | * @param classifier function that groups elements into batches | |
| 248 | * @param mapper transformation applied to each element | |
| 249 | * @param collector reduction applied to the resulting {@code Stream<Grouped<K, R>>} | |
| 250 | * @param executor the {@code Executor} used for asynchronous execution | |
| 251 | * @param parallelism maximum allowed parallelism | |
| 252 | * @param <T> the input element type | |
| 253 | * @param <K> the classification key type | |
| 254 | * @param <R> the type produced by {@code mapper} | |
| 255 | * @param <RR> the reduction result type produced by {@code collector} | |
| 256 | * | |
| 257 | * @return a {@code Collector} producing a {@link CompletableFuture} whose value is obtained | |
| 258 | * by reducing the {@code Stream<Grouped<K, R>>} produced by the parallel classification | |
| 259 | * | |
| 260 | * @since 3.4.0 | |
| 261 | */ | |
| 262 | public static <T, K, R, RR> Collector<T, ?, CompletableFuture<RR>> parallelBy( | |
| 263 | Function<? super T, ? extends K> classifier, | |
| 264 | Function<? super T, ? extends R> mapper, | |
| 265 | Collector<Grouped<K, R>, ?, RR> collector, | |
| 266 | Executor executor, | |
| 267 | int parallelism) { | |
| 268 | ||
| 269 | Objects.requireNonNull(collector, "collector cannot be null"); | |
| 270 | ||
| 271 |
2
1. parallelBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelBy → KILLED 2. lambda$parallelBy$4 : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::lambda$parallelBy$4 → KILLED |
return Factory.collectingBy(classifier, (Function<Stream<Grouped<K, R>>, RR>) s -> s.collect(collector), mapper, |
| 272 | Configurer.collecting(c -> c | |
| 273 | .executor(executor) | |
| 274 | .parallelism(parallelism))); | |
| 275 | } | |
| 276 | ||
| 277 | /** | |
| 278 | * A convenience {@link Collector} that performs parallel computations on a custom {@link Executor} | |
| 279 | * with effectively unlimited parallelism and returns a {@link CompletableFuture} containing the | |
| 280 | * result of applying the user-provided {@link Collector} to the mapped elements. | |
| 281 | * <p> | |
| 282 | * Each element is transformed using the provided {@code mapper} in parallel on the specified | |
| 283 | * {@code executor}, and the results are reduced according to the supplied {@code collector}. | |
| 284 | * | |
| 285 | * <br> | |
| 286 | * Example: | |
| 287 | * <pre>{@code | |
| 288 | * CompletableFuture<List<String>> result = Stream.of(1, 2, 3) | |
| 289 | * .collect(parallel(i -> foo(i), toList(), executor)); | |
| 290 | * }</pre> | |
| 291 | * | |
| 292 | * @param mapper transformation applied to each element | |
| 293 | * @param collector the {@code Collector} describing the reduction | |
| 294 | * @param executor the {@code Executor} used for asynchronous execution | |
| 295 | * @param <T> the input element type | |
| 296 | * @param <R> the type produced by {@code mapper} | |
| 297 | * @param <RR> the reduction result type produced by {@code collector} | |
| 298 | * | |
| 299 | * @return a {@code Collector} producing a {@link CompletableFuture} of the reduced result | |
| 300 | * | |
| 301 | * @since 3.3.0 | |
| 302 | */ | |
| 303 | public static <T, R, RR> Collector<T, ?, CompletableFuture<RR>> parallel( | |
| 304 | Function<? super T, ? extends R> mapper, | |
| 305 | Collector<R, ?, RR> collector, | |
| 306 | Executor executor) { | |
| 307 | ||
| 308 | Objects.requireNonNull(collector, "collector cannot be null"); | |
| 309 |
2
1. parallel : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallel → KILLED 2. lambda$parallel$6 : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::lambda$parallel$6 → KILLED |
return Factory.collecting(s -> s.collect(collector), mapper, Configurer.collecting(c -> c.executor(executor))); |
| 310 | } | |
| 311 | ||
| 312 | /** | |
| 313 | * A convenience {@link Collector} that performs parallel computations by classifying input | |
| 314 | * elements using the provided {@code classifier}, applying the given {@code mapper}, and | |
| 315 | * emitting {@link Grouped} entries representing each batch. | |
| 316 | * <p> | |
| 317 | * The generated {@link Stream} of {@code Grouped<K, R>} instances is then reduced using the | |
| 318 | * user-provided {@code collector}, executed on the supplied {@link Executor}. Each group is | |
| 319 | * processed independently, and every batch is guaranteed to be processed on a single thread. | |
| 320 | * The reduction is applied to grouped results rather than to the raw mapped elements. | |
| 321 | * <br> | |
| 322 | * <br> | |
| 323 | * Example: | |
| 324 | * <pre>{@code | |
| 325 | * CompletableFuture<List<Grouped<String, String>>> result = Stream.of(task1, task2, task3) | |
| 326 | * .collect(parallelBy( | |
| 327 | * Task::groupId, | |
| 328 | * t -> compute(t), | |
| 329 | * toList(), | |
| 330 | * executor)); | |
| 331 | * }</pre> | |
| 332 | * | |
| 333 | * @param classifier function that groups elements into batches | |
| 334 | * @param mapper transformation applied to each element | |
| 335 | * @param collector reduction applied to the resulting {@code Stream<Grouped<K, R>>} | |
| 336 | * @param executor the {@code Executor} used for asynchronous execution | |
| 337 | * @param <T> the input element type | |
| 338 | * @param <K> the classification key type | |
| 339 | * @param <R> the type produced by {@code mapper} | |
| 340 | * @param <RR> the reduction result type produced by {@code collector} | |
| 341 | * | |
| 342 | * @return a {@code Collector} producing a {@link CompletableFuture} whose value is obtained | |
| 343 | * by reducing the {@code Stream<Grouped<K, R>>} produced by the parallel classification | |
| 344 | * | |
| 345 | * @since 3.4.0 | |
| 346 | */ | |
| 347 | public static <T, K, R, RR> Collector<T, ?, CompletableFuture<RR>> parallelBy( | |
| 348 | Function<? super T, ? extends K> classifier, | |
| 349 | Function<? super T, ? extends R> mapper, | |
| 350 | Collector<Grouped<K, R>, ?, RR> collector, | |
| 351 | Executor executor) { | |
| 352 | Objects.requireNonNull(collector, "collector cannot be null"); | |
| 353 |
2
1. lambda$parallelBy$6 : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::lambda$parallelBy$6 → KILLED 2. parallelBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelBy → KILLED |
return Factory.collectingBy(classifier, (Function<Stream<Grouped<K, R>>, RR>) s -> s.collect(collector), mapper, Configurer.collecting(c -> c.executor(executor))); |
| 354 | } | |
| 355 | ||
| 356 | /** | |
| 357 | * A convenience {@link Collector} that performs parallel computations using Virtual Threads | |
| 358 | * and returns a {@link CompletableFuture} containing a {@link Stream} of the mapped elements. | |
| 359 | * <p> | |
| 360 | * The collector maintains the encounter order of the processed elements. Instances of this | |
| 361 | * collector should not be reused. | |
| 362 | * | |
| 363 | * <br> | |
| 364 | * Example: | |
| 365 | * <pre>{@code | |
| 366 | * CompletableFuture<Stream<String>> result = Stream.of(1, 2, 3) | |
| 367 | * .collect(parallel(i -> foo())); | |
| 368 | * }</pre> | |
| 369 | * | |
| 370 | * @param mapper a transformation applied to each element | |
| 371 | * @param <T> the input element type | |
| 372 | * @param <R> the type produced by {@code mapper} | |
| 373 | * | |
| 374 | * @return a {@code Collector} producing a {@link CompletableFuture} of a {@link Stream} of mapped elements | |
| 375 | * | |
| 376 | * @since 3.0.0 | |
| 377 | */ | |
| 378 | public static <T, R> Collector<T, ?, CompletableFuture<Stream<R>>> parallel( | |
| 379 | Function<? super T, ? extends R> mapper) { | |
| 380 | ||
| 381 |
2
1. parallel : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallel → KILLED 2. lambda$parallel$8 : replaced return value with Stream.empty for com/pivovarit/collectors/ParallelCollectors::lambda$parallel$8 → KILLED |
return Factory.collecting((Function<Stream<R>, Stream<R>>) i -> i, mapper, Configurer.collecting(c -> {})); |
| 382 | } | |
| 383 | ||
| 384 | /** | |
| 385 | * A convenience {@link Collector} that performs parallel computations by classifying input | |
| 386 | * elements using the provided {@code classifier}, applying the given {@code mapper}, and | |
| 387 | * emitting {@link Grouped} entries representing each batch. | |
| 388 | * <p> | |
| 389 | * The resulting {@link CompletableFuture} completes with a {@link Stream} of | |
| 390 | * {@code Grouped<K, R>} instances. Each group is processed independently on Virtual Threads, | |
| 391 | * and every batch is guaranteed to be processed on a single thread. The encounter order of | |
| 392 | * elements within each batch is preserved. | |
| 393 | * <br> | |
| 394 | * <br> | |
| 395 | * Example: | |
| 396 | * <pre>{@code | |
| 397 | * CompletableFuture<Stream<Grouped<String, String>>> result = Stream.of(t1, t2, t3) | |
| 398 | * .collect(parallelBy(Task::groupId, t -> compute(t))); | |
| 399 | * }</pre> | |
| 400 | * | |
| 401 | * @param classifier function that groups elements into batches | |
| 402 | * @param mapper transformation applied to each element | |
| 403 | * @param <T> the input element type | |
| 404 | * @param <K> the classification key type | |
| 405 | * @param <R> the type produced by {@code mapper} | |
| 406 | * | |
| 407 | * @return a {@code Collector} producing a {@link CompletableFuture} whose value is a | |
| 408 | * {@link Stream} of {@code Grouped<K, R>} produced by the parallel classification | |
| 409 | * | |
| 410 | * @since 3.4.0 | |
| 411 | */ | |
| 412 | public static <T, K, R> Collector<T, ?, CompletableFuture<Stream<Grouped<K, R>>>> parallelBy( | |
| 413 | Function<? super T, ? extends K> classifier, | |
| 414 | Function<? super T, ? extends R> mapper) { | |
| 415 |
1
1. parallelBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelBy → KILLED |
return Factory.collectingBy(classifier, mapper, Configurer.collecting(c -> {})); |
| 416 | } | |
| 417 | ||
| 418 | /** | |
| 419 | * A convenience {@link Collector} that performs parallel computations using Virtual Threads | |
| 420 | * and returns a {@link CompletableFuture} containing a {@link Stream} of the mapped elements. | |
| 421 | * <p> | |
| 422 | * The collector maintains the encounter order of the processed elements. Instances of this | |
| 423 | * collector should not be reused. | |
| 424 | * | |
| 425 | * <br> | |
| 426 | * Example: | |
| 427 | * <pre>{@code | |
| 428 | * CompletableFuture<Stream<String>> result = Stream.of(1, 2, 3) | |
| 429 | * .collect(parallel(i -> foo(), 4)); | |
| 430 | * }</pre> | |
| 431 | * | |
| 432 | * @param mapper a transformation applied to each element | |
| 433 | * @param parallelism the maximum degree of parallelism | |
| 434 | * @param <T> the input element type | |
| 435 | * @param <R> the type produced by {@code mapper} | |
| 436 | * | |
| 437 | * @return a {@code Collector} producing a {@link CompletableFuture} of a {@link Stream} of mapped elements | |
| 438 | * | |
| 439 | * @since 3.2.0 | |
| 440 | */ | |
| 441 | public static <T, R> Collector<T, ?, CompletableFuture<Stream<R>>> parallel( | |
| 442 | Function<? super T, ? extends R> mapper, | |
| 443 | int parallelism) { | |
| 444 |
2
1. parallel : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallel → KILLED 2. lambda$parallel$10 : replaced return value with Stream.empty for com/pivovarit/collectors/ParallelCollectors::lambda$parallel$10 → KILLED |
return Factory.collecting((Function<Stream<R>, Stream<R>>) i -> i, mapper, Configurer.collecting(c -> c.parallelism(parallelism))); |
| 445 | } | |
| 446 | ||
| 447 | /** | |
| 448 | * A convenience {@link Collector} that performs parallel computations by classifying input | |
| 449 | * elements using the provided {@code classifier}, applying the given {@code mapper}, and | |
| 450 | * emitting {@link Grouped} entries representing each batch. | |
| 451 | * <p> | |
| 452 | * The resulting {@link CompletableFuture} completes with a {@link Stream} of | |
| 453 | * {@code Grouped<K, R>} instances. Each group is processed independently on Virtual Threads, | |
| 454 | * and every batch is guaranteed to be processed on a single thread. The encounter order of | |
| 455 | * elements within each batch is preserved. | |
| 456 | * <br> | |
| 457 | * <br> | |
| 458 | * Example: | |
| 459 | * <pre>{@code | |
| 460 | * CompletableFuture<Stream<Grouped<String, String>>> result = Stream.of(t1, t2, t3) | |
| 461 | * .collect(parallelBy(Task::groupId, t -> compute(t), 4)); | |
| 462 | * }</pre> | |
| 463 | * | |
| 464 | * @param classifier function that groups elements into batches | |
| 465 | * @param mapper transformation applied to each element | |
| 466 | * @param parallelism the maximum degree of parallelism | |
| 467 | * @param <T> the input element type | |
| 468 | * @param <K> the classification key type | |
| 469 | * @param <R> the type produced by {@code mapper} | |
| 470 | * | |
| 471 | * @return a {@code Collector} producing a {@link CompletableFuture} whose value is a | |
| 472 | * {@link Stream} of {@code Grouped<K, R>} produced by the parallel classification | |
| 473 | * | |
| 474 | * @since 3.4.0 | |
| 475 | */ | |
| 476 | public static <T, K, R> Collector<T, ?, CompletableFuture<Stream<Grouped<K, R>>>> parallelBy( | |
| 477 | Function<? super T, ? extends K> classifier, | |
| 478 | Function<? super T, ? extends R> mapper, | |
| 479 | int parallelism) { | |
| 480 |
1
1. parallelBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelBy → KILLED |
return Factory.collectingBy(classifier, mapper, Configurer.collecting(c -> c.parallelism(parallelism))); |
| 481 | } | |
| 482 | ||
| 483 | /** | |
| 484 | * A convenience {@link Collector} that performs parallel computations on a custom {@link Executor} | |
| 485 | * and returns a {@link CompletableFuture} containing a {@link Stream} of the mapped elements. | |
| 486 | * <p> | |
| 487 | * The collector maintains the encounter order of the processed elements. Instances of this | |
| 488 | * collector should not be reused. | |
| 489 | * | |
| 490 | * <br> | |
| 491 | * Example: | |
| 492 | * <pre>{@code | |
| 493 | * CompletableFuture<Stream<String>> result = Stream.of(1, 2, 3) | |
| 494 | * .collect(parallel(i -> foo(), executor, 2)); | |
| 495 | * }</pre> | |
| 496 | * | |
| 497 | * @param mapper a transformation applied to each element | |
| 498 | * @param executor the {@code Executor} used for asynchronous execution | |
| 499 | * @param parallelism the maximum degree of parallelism | |
| 500 | * @param <T> the input element type | |
| 501 | * @param <R> the type produced by {@code mapper} | |
| 502 | * | |
| 503 | * @return a {@code Collector} producing a {@link CompletableFuture} of a {@link Stream} of mapped elements | |
| 504 | * | |
| 505 | * @since 2.0.0 | |
| 506 | */ | |
| 507 | public static <T, R> Collector<T, ?, CompletableFuture<Stream<R>>> parallel( | |
| 508 | Function<? super T, ? extends R> mapper, | |
| 509 | Executor executor, | |
| 510 | int parallelism) { | |
| 511 | ||
| 512 |
2
1. lambda$parallel$12 : replaced return value with Stream.empty for com/pivovarit/collectors/ParallelCollectors::lambda$parallel$12 → KILLED 2. parallel : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallel → KILLED |
return Factory.collecting((Function<Stream<R>, Stream<R>>) i -> i, mapper, |
| 513 | Configurer.collecting(c -> c | |
| 514 | .executor(executor) | |
| 515 | .parallelism(parallelism))); | |
| 516 | } | |
| 517 | ||
| 518 | /** | |
| 519 | * A convenience {@link Collector} that performs parallel computations by classifying elements | |
| 520 | * into groups using the provided {@code classifier}, executing each group asynchronously on the | |
| 521 | * supplied {@link Executor}, and returning a {@link CompletableFuture} that yields a | |
| 522 | * {@link Stream} of {@link Grouped} results. | |
| 523 | * <p> | |
| 524 | * Elements within each group preserve encounter order. Instances of this collector are not | |
| 525 | * intended to be reused. | |
| 526 | * | |
| 527 | * <br> | |
| 528 | * Example: | |
| 529 | * <pre>{@code | |
| 530 | * CompletableFuture<Stream<Grouped<String, String>>> result = Stream.of(t1, t2, t3) | |
| 531 | * .collect(parallelBy(Task::groupId, t -> compute(t), executor, 4)); | |
| 532 | * }</pre> | |
| 533 | * | |
| 534 | * @param classifier function that assigns each input element to a group | |
| 535 | * @param mapper transformation applied to each element | |
| 536 | * @param executor the {@code Executor} used for asynchronous execution | |
| 537 | * @param parallelism the maximum degree of parallelism | |
| 538 | * @param <T> the input element type | |
| 539 | * @param <K> the classification key type | |
| 540 | * @param <R> the mapped element type | |
| 541 | * | |
| 542 | * @return a {@code Collector} producing a {@link CompletableFuture} of a | |
| 543 | * {@link Stream} of {@link Grouped} results | |
| 544 | * | |
| 545 | * @since 3.4.0 | |
| 546 | */ | |
| 547 | public static <T, K, R> Collector<T, ?, CompletableFuture<Stream<Grouped<K, R>>>> parallelBy( | |
| 548 | Function<? super T, ? extends K> classifier, | |
| 549 | Function<? super T, ? extends R> mapper, | |
| 550 | Executor executor, | |
| 551 | int parallelism) { | |
| 552 |
1
1. parallelBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelBy → KILLED |
return Factory.collectingBy(classifier, mapper, |
| 553 | Configurer.collecting(c -> c | |
| 554 | .executor(executor) | |
| 555 | .parallelism(parallelism))); | |
| 556 | } | |
| 557 | ||
| 558 | /** | |
| 559 | * A convenience {@link Collector} that performs parallel computations on a custom {@link Executor} | |
| 560 | * with effectively unlimited parallelism and returns a {@link CompletableFuture} containing a | |
| 561 | * {@link Stream} of the mapped elements. | |
| 562 | * <p> | |
| 563 | * The collector maintains the encounter order of the processed elements. Instances of this | |
| 564 | * collector should not be reused. | |
| 565 | * | |
| 566 | * <br> | |
| 567 | * Example: | |
| 568 | * <pre>{@code | |
| 569 | * CompletableFuture<Stream<String>> result = Stream.of(1, 2, 3) | |
| 570 | * .collect(parallel(i -> foo(), executor)); | |
| 571 | * }</pre> | |
| 572 | * | |
| 573 | * @param mapper a transformation applied to each element | |
| 574 | * @param executor the {@code Executor} used for asynchronous execution | |
| 575 | * @param <T> the input element type | |
| 576 | * @param <R> the type produced by {@code mapper} | |
| 577 | * | |
| 578 | * @return a {@code Collector} producing a {@link CompletableFuture} of a {@link Stream} of mapped elements | |
| 579 | * | |
| 580 | * @since 3.3.0 | |
| 581 | */ | |
| 582 | public static <T, R> Collector<T, ?, CompletableFuture<Stream<R>>> parallel( | |
| 583 | Function<? super T, ? extends R> mapper, | |
| 584 | Executor executor) { | |
| 585 | ||
| 586 |
2
1. parallel : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallel → KILLED 2. lambda$parallel$14 : replaced return value with Stream.empty for com/pivovarit/collectors/ParallelCollectors::lambda$parallel$14 → KILLED |
return Factory.collecting((Function<Stream<R>, Stream<R>>) i -> i, mapper, Configurer.collecting(c -> c.executor(executor))); |
| 587 | } | |
| 588 | ||
| 589 | /** | |
| 590 | * A convenience {@link Collector} that performs parallel computations by classifying elements | |
| 591 | * using the provided {@code classifier}, executing each group asynchronously on the supplied | |
| 592 | * {@link Executor}, and returning a {@link CompletableFuture} that yields a | |
| 593 | * {@link Stream} of {@link Grouped} results. | |
| 594 | * <p> | |
| 595 | * Elements within a group preserve their encounter order. Instances of this collector are | |
| 596 | * not intended to be reused. | |
| 597 | * | |
| 598 | * <br> | |
| 599 | * Example: | |
| 600 | * <pre>{@code | |
| 601 | * CompletableFuture<Stream<Grouped<String, String>>> future = Stream.of(t1, t2, t3) | |
| 602 | * .collect(parallelBy(Task::groupId, t -> compute(t), executor)); | |
| 603 | * }</pre> | |
| 604 | * | |
| 605 | * @param classifier function that assigns each element to a group | |
| 606 | * @param mapper transformation applied to each element | |
| 607 | * @param executor the {@code Executor} used for asynchronous execution | |
| 608 | * @param <T> the input element type | |
| 609 | * @param <K> the classification key type | |
| 610 | * @param <R> the mapped element type | |
| 611 | * | |
| 612 | * @return a {@code Collector} producing a {@link CompletableFuture} | |
| 613 | * of a {@link Stream} of {@link Grouped} results | |
| 614 | * | |
| 615 | * @since 3.4.0 | |
| 616 | */ | |
| 617 | public static <T, K, R> Collector<T, ?, CompletableFuture<Stream<Grouped<K, R>>>> parallelBy( | |
| 618 | Function<? super T, ? extends K> classifier, | |
| 619 | Function<? super T, ? extends R> mapper, | |
| 620 | Executor executor) { | |
| 621 | ||
| 622 |
1
1. parallelBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelBy → KILLED |
return Factory.collectingBy(classifier, mapper, Configurer.collecting(c -> c.executor(executor))); |
| 623 | } | |
| 624 | ||
| 625 | /** | |
| 626 | * A convenience {@link Collector} that performs parallel computations using Virtual Threads | |
| 627 | * and returns a {@link Stream} of the mapped elements as they arrive. | |
| 628 | * <p> | |
| 629 | * For a parallelism of 1, the stream is executed by the calling thread. | |
| 630 | * | |
| 631 | * <br> | |
| 632 | * Example: | |
| 633 | * <pre>{@code | |
| 634 | * Stream.of(1, 2, 3) | |
| 635 | * .collect(parallelToStream(i -> foo())) | |
| 636 | * .forEach(System.out::println); | |
| 637 | * }</pre> | |
| 638 | * | |
| 639 | * @param mapper a transformation applied to each element | |
| 640 | * @param <T> the input element type | |
| 641 | * @param <R> the type produced by {@code mapper} | |
| 642 | * | |
| 643 | * @return a {@code Collector} producing a {@link Stream} of mapped elements in parallel | |
| 644 | * | |
| 645 | * @since 3.0.0 | |
| 646 | */ | |
| 647 | public static <T, R> Collector<T, ?, Stream<R>> parallelToStream( | |
| 648 | Function<? super T, ? extends R> mapper) { | |
| 649 | ||
| 650 |
1
1. parallelToStream : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToStream → KILLED |
return Factory.streaming(mapper, Configurer.streaming(c -> {})); |
| 651 | } | |
| 652 | ||
| 653 | /** | |
| 654 | * A convenience {@link Collector} that performs parallel computations by classifying elements | |
| 655 | * using the provided {@code classifier}, applying the given {@code mapper}, and producing a | |
| 656 | * {@link Stream} of {@link Grouped} elements as they become available. | |
| 657 | * <p> | |
| 658 | * Each group is processed independently on Virtual Threads, and every batch is guaranteed to | |
| 659 | * be executed on a single thread. The encounter order within each group is preserved. | |
| 660 | * | |
| 661 | * <br> | |
| 662 | * Example: | |
| 663 | * <pre>{@code | |
| 664 | * Stream.of(task1, task2, task3) | |
| 665 | * .collect(parallelToStreamBy(Task::groupId, t -> compute(t))) | |
| 666 | * .forEach(System.out::println); | |
| 667 | * }</pre> | |
| 668 | * | |
| 669 | * @param classifier function that assigns each input element to a group | |
| 670 | * @param mapper transformation applied to each element | |
| 671 | * @param <T> the input element type | |
| 672 | * @param <K> the classification key type | |
| 673 | * @param <R> the mapped element type | |
| 674 | * | |
| 675 | * @return a {@code Collector} producing a {@link Stream} of {@link Grouped} elements | |
| 676 | * computed in parallel | |
| 677 | * | |
| 678 | * @since 3.4.0 | |
| 679 | */ | |
| 680 | public static <T, K, R> Collector<T, ?, Stream<Grouped<K, R>>> parallelToStreamBy( | |
| 681 | Function<? super T, ? extends K> classifier, | |
| 682 | Function<? super T, ? extends R> mapper) { | |
| 683 | ||
| 684 |
1
1. parallelToStreamBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToStreamBy → KILLED |
return Factory.streamingBy(classifier, mapper, Configurer.streaming(c -> {})); |
| 685 | } | |
| 686 | ||
| 687 | /** | |
| 688 | * A convenience {@link Collector} that performs parallel computations using Virtual Threads | |
| 689 | * and returns a {@link Stream} of the mapped elements as they arrive. | |
| 690 | * <p> | |
| 691 | * For a parallelism of 1, the stream is executed by the calling thread. | |
| 692 | * | |
| 693 | * <br> | |
| 694 | * Example: | |
| 695 | * <pre>{@code | |
| 696 | * Stream.of(1, 2, 3) | |
| 697 | * .collect(parallelToStream(i -> foo(), 2)) | |
| 698 | * .forEach(System.out::println); | |
| 699 | * }</pre> | |
| 700 | * | |
| 701 | * @param mapper a transformation applied to each element | |
| 702 | * @param parallelism the maximum degree of parallelism | |
| 703 | * @param <T> the input element type | |
| 704 | * @param <R> the type produced by {@code mapper} | |
| 705 | * | |
| 706 | * @return a {@code Collector} producing a {@link Stream} of mapped elements in parallel | |
| 707 | * | |
| 708 | * @since 3.2.0 | |
| 709 | */ | |
| 710 | public static <T, R> Collector<T, ?, Stream<R>> parallelToStream( | |
| 711 | Function<? super T, ? extends R> mapper, | |
| 712 | int parallelism) { | |
| 713 | ||
| 714 |
1
1. parallelToStream : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToStream → KILLED |
return Factory.streaming(mapper, Configurer.streaming(c -> c.parallelism(parallelism))); |
| 715 | } | |
| 716 | ||
| 717 | /** | |
| 718 | * A convenience {@link Collector} that performs parallel computations by classifying elements | |
| 719 | * using the provided {@code classifier}, applying the given {@code mapper}, and producing a | |
| 720 | * {@link Stream} of {@link Grouped} elements as they become available. | |
| 721 | * <p> | |
| 722 | * Each group is processed independently on Virtual Threads, and every batch is guaranteed to | |
| 723 | * be executed on a single thread. The encounter order within each group is preserved. | |
| 724 | * A {@code parallelism} parameter limits the maximum number of concurrently processed groups. | |
| 725 | * | |
| 726 | * <br> | |
| 727 | * Example: | |
| 728 | * <pre>{@code | |
| 729 | * Stream.of(t1, t2, t3) | |
| 730 | * .collect(parallelToStreamBy(Task::groupId, t -> compute(t), 2)) | |
| 731 | * .forEach(System.out::println); | |
| 732 | * }</pre> | |
| 733 | * | |
| 734 | * @param classifier function that assigns each input element to a group | |
| 735 | * @param mapper transformation applied to each element | |
| 736 | * @param parallelism the maximum degree of parallelism | |
| 737 | * @param <T> the input element type | |
| 738 | * @param <K> the classification key type | |
| 739 | * @param <R> the mapped element type | |
| 740 | * | |
| 741 | * @return a {@code Collector} producing a {@link Stream} of {@link Grouped} elements | |
| 742 | * computed in parallel | |
| 743 | * | |
| 744 | * @since 3.4.0 | |
| 745 | */ | |
| 746 | public static <T, K, R> Collector<T, ?, Stream<Grouped<K, R>>> parallelToStreamBy( | |
| 747 | Function<? super T, ? extends K> classifier, | |
| 748 | Function<? super T, ? extends R> mapper, | |
| 749 | int parallelism) { | |
| 750 | ||
| 751 |
1
1. parallelToStreamBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToStreamBy → KILLED |
return Factory.streamingBy(classifier, mapper, Configurer.streaming(c -> c.parallelism(parallelism))); |
| 752 | } | |
| 753 | ||
| 754 | /** | |
| 755 | * A convenience {@link Collector} that performs parallel computations on a custom {@link Executor} | |
| 756 | * with effectively unlimited parallelism and returns a {@link Stream} of the mapped elements as they arrive. | |
| 757 | * <p> | |
| 758 | * For a parallelism of 1, the stream is executed by the calling thread. | |
| 759 | * | |
| 760 | * <br> | |
| 761 | * Example: | |
| 762 | * <pre>{@code | |
| 763 | * Stream.of(1, 2, 3) | |
| 764 | * .collect(parallelToStream(i -> foo(), executor)) | |
| 765 | * .forEach(System.out::println); | |
| 766 | * }</pre> | |
| 767 | * | |
| 768 | * @param mapper a transformation applied to each element | |
| 769 | * @param executor the {@code Executor} used for asynchronous execution | |
| 770 | * @param <T> the input element type | |
| 771 | * @param <R> the type produced by {@code mapper} | |
| 772 | * | |
| 773 | * @return a {@code Collector} producing a {@link Stream} of mapped elements in parallel | |
| 774 | * | |
| 775 | * @since 3.3.0 | |
| 776 | */ | |
| 777 | public static <T, R> Collector<T, ?, Stream<R>> parallelToStream( | |
| 778 | Function<? super T, ? extends R> mapper, | |
| 779 | Executor executor) { | |
| 780 | ||
| 781 |
1
1. parallelToStream : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToStream → KILLED |
return Factory.streaming(mapper, Configurer.streaming(c -> c.executor(executor))); |
| 782 | } | |
| 783 | ||
| 784 | /** | |
| 785 | * A convenience {@link Collector} that performs parallel computations by classifying elements | |
| 786 | * using the provided {@code classifier}, applying the given {@code mapper}, and producing a | |
| 787 | * {@link Stream} of {@link Grouped} elements as they become available. | |
| 788 | * <p> | |
| 789 | * Each group is processed independently on the supplied {@link Executor}, and every batch is | |
| 790 | * guaranteed to be executed on a single thread. The encounter order within each group is preserved. | |
| 791 | * | |
| 792 | * <br> | |
| 793 | * Example: | |
| 794 | * <pre>{@code | |
| 795 | * Stream.of(t1, t2, t3) | |
| 796 | * .collect(parallelToStreamBy(Task::groupId, t -> compute(t), executor)) | |
| 797 | * .forEach(System.out::println); | |
| 798 | * }</pre> | |
| 799 | * | |
| 800 | * @param classifier function that assigns each input element to a group | |
| 801 | * @param mapper transformation applied to each element | |
| 802 | * @param executor the {@code Executor} used for asynchronous execution | |
| 803 | * @param <T> the input element type | |
| 804 | * @param <K> the classification key type | |
| 805 | * @param <R> the mapped element type | |
| 806 | * | |
| 807 | * @return a {@code Collector} producing a {@link Stream} of {@link Grouped} elements | |
| 808 | * computed in parallel | |
| 809 | * | |
| 810 | * @since 3.4.0 | |
| 811 | */ | |
| 812 | public static <T, K, R> Collector<T, ?, Stream<Grouped<K, R>>> parallelToStreamBy( | |
| 813 | Function<? super T, ? extends K> classifier, | |
| 814 | Function<? super T, ? extends R> mapper, | |
| 815 | Executor executor) { | |
| 816 | ||
| 817 |
1
1. parallelToStreamBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToStreamBy → KILLED |
return Factory.streamingBy(classifier, mapper, Configurer.streaming(c -> c.executor(executor))); |
| 818 | } | |
| 819 | ||
| 820 | /** | |
| 821 | * A convenience {@link Collector} that performs parallel computations on a custom {@link Executor} | |
| 822 | * and returns a {@link Stream} yielding results as soon as they are produced. | |
| 823 | * <p> | |
| 824 | * Each input element is submitted independently for asynchronous processing using the provided | |
| 825 | * {@code mapper}. Execution may proceed in parallel up to the configured {@code parallelism}. | |
| 826 | * When the parallelism is set to {@code 1}, all work is performed on the calling thread. | |
| 827 | * <p> | |
| 828 | * Ordering characteristics: | |
| 829 | * <ul> | |
| 830 | * <li>The encounter order of input elements is not preserved.</li> | |
| 831 | * <li>Results are emitted in the order in which they complete.</li> | |
| 832 | * </ul> | |
| 833 | * <p> | |
| 834 | * Example: | |
| 835 | * <pre>{@code | |
| 836 | * Stream.of(1, 2, 3) | |
| 837 | * .collect(parallelToStream(i -> foo(i), executor, 2)) | |
| 838 | * .forEach(System.out::println); | |
| 839 | * }</pre> | |
| 840 | * | |
| 841 | * @param mapper transformation applied to each element | |
| 842 | * @param executor the {@code Executor} used for asynchronous execution | |
| 843 | * @param parallelism the maximum degree of parallelism | |
| 844 | * @param <T> the input element type | |
| 845 | * @param <R> the result type produced by {@code mapper} | |
| 846 | * | |
| 847 | * @return a {@code Collector} producing a {@link Stream} of mapped results as they complete | |
| 848 | * | |
| 849 | * @since 2.0.0 | |
| 850 | */ | |
| 851 | public static <T, R> Collector<T, ?, Stream<R>> parallelToStream(Function<? super T, ? extends R> mapper, Executor executor, int parallelism) { | |
| 852 |
1
1. parallelToStream : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToStream → KILLED |
return Factory.streaming(mapper, |
| 853 | Configurer.streaming(c -> c | |
| 854 | .executor(executor) | |
| 855 | .parallelism(parallelism))); | |
| 856 | } | |
| 857 | ||
| 858 | /** | |
| 859 | * A convenience {@link Collector} that performs parallel computations on a custom {@link Executor}, | |
| 860 | * ensuring that all elements classified into the same group are processed on a single thread. | |
| 861 | * <p> | |
| 862 | * Incoming elements are partitioned using the provided {@code classifier}. Each partition | |
| 863 | * (i.e., batch associated with a classification key) is executed as a unit, guaranteeing that all | |
| 864 | * elements within that batch are processed by the same thread. Different batches may run in | |
| 865 | * parallel depending on the configured {@code parallelism}. | |
| 866 | * <p> | |
| 867 | * Ordering guarantees: | |
| 868 | * <ul> | |
| 869 | * <li>Elements within the same batch preserve their encounter order.</li> | |
| 870 | * <li>Batches themselves may execute and complete in any order.</li> | |
| 871 | * </ul> | |
| 872 | * <p> | |
| 873 | * The resulting {@link Stream} emits mapped results as soon as they are produced. If | |
| 874 | * {@code parallelism} is set to {@code 1}, all work is executed on the calling thread. | |
| 875 | * | |
| 876 | * <br> | |
| 877 | * Example: | |
| 878 | * <pre>{@code | |
| 879 | * Stream.of(t1, t2, t3) | |
| 880 | * .collect(parallelToStreamBy(Task::groupId, t -> compute(t), executor, 4)) | |
| 881 | * .forEach(System.out::println); | |
| 882 | * }</pre> | |
| 883 | * | |
| 884 | * @param classifier function that assigns elements to groups; all elements with the same key | |
| 885 | * are guaranteed to run on the same thread | |
| 886 | * @param mapper transformation applied to each element | |
| 887 | * @param executor the {@code Executor} used for asynchronous execution | |
| 888 | * @param parallelism the maximum allowed parallelism | |
| 889 | * @param <T> the input element type | |
| 890 | * @param <K> the classification key type | |
| 891 | * @param <R> the mapped result type | |
| 892 | * | |
| 893 | * @return a {@code Collector} producing a {@link Stream} of mapped results as they become available | |
| 894 | * | |
| 895 | * @since 3.4.0 | |
| 896 | */ | |
| 897 | public static <T, K, R> Collector<T, ?, Stream<Grouped<K, R>>> parallelToStreamBy(Function<? super T, ? extends K> classifier, Function<? super T, ? extends R> mapper, Executor executor, int parallelism) { | |
| 898 |
1
1. parallelToStreamBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToStreamBy → KILLED |
return Factory.streamingBy(classifier, mapper, |
| 899 | Configurer.streaming(c -> c | |
| 900 | .executor(executor) | |
| 901 | .parallelism(parallelism))); | |
| 902 | } | |
| 903 | ||
| 904 | /** | |
| 905 | * A convenience {@link Collector} that performs parallel computations using Virtual Threads | |
| 906 | * and returns a {@link Stream} of the mapped elements as they arrive while maintaining the initial order. | |
| 907 | * <p> | |
| 908 | * For a parallelism of 1, the stream is executed by the calling thread. | |
| 909 | * | |
| 910 | * <br> | |
| 911 | * Example: | |
| 912 | * <pre>{@code | |
| 913 | * Stream.of(1, 2, 3) | |
| 914 | * .collect(parallelToOrderedStream(i -> foo())) | |
| 915 | * .forEach(System.out::println); | |
| 916 | * }</pre> | |
| 917 | * | |
| 918 | * @param mapper a transformation applied to each element | |
| 919 | * @param <T> the input element type | |
| 920 | * @param <R> the type produced by {@code mapper} | |
| 921 | * | |
| 922 | * @return a {@code Collector} producing a {@link Stream} of mapped elements in parallel, preserving order | |
| 923 | * | |
| 924 | * @since 3.0.0 | |
| 925 | */ | |
| 926 | public static <T, R> Collector<T, ?, Stream<R>> parallelToOrderedStream( | |
| 927 | Function<? super T, ? extends R> mapper) { | |
| 928 | ||
| 929 |
1
1. parallelToOrderedStream : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToOrderedStream → KILLED |
return Factory.streaming(mapper, Configurer.streaming(Configurer.Streaming::ordered)); |
| 930 | } | |
| 931 | ||
| 932 | /** | |
| 933 | * A convenience {@link Collector} that performs parallel computations by classifying elements | |
| 934 | * using the provided {@code classifier}, applying the given {@code mapper}, and producing a | |
| 935 | * {@link Stream} of {@link Grouped} elements as they become available while preserving the | |
| 936 | * original encounter order of input elements. | |
| 937 | * <p> | |
| 938 | * Ordering guarantees: | |
| 939 | * <ul> | |
| 940 | * <li>The encounter order of input elements is preserved within the resulting {@link Stream}.</li> | |
| 941 | * <li>Parallel execution does not affect the final ordering of elements in the resulting stream.</li> | |
| 942 | * </ul> | |
| 943 | * <p> | |
| 944 | * Each group is processed independently on Virtual Threads, and every batch is guaranteed to | |
| 945 | * be executed on a single thread. | |
| 946 | * | |
| 947 | * <br> | |
| 948 | * Example: | |
| 949 | * <pre>{@code | |
| 950 | * Stream.of(t1, t2, t3) | |
| 951 | * .collect(parallelToOrderedStreamBy(Task::groupId, t -> compute(t))) | |
| 952 | * .forEach(System.out::println); | |
| 953 | * }</pre> | |
| 954 | * | |
| 955 | * @param classifier function that assigns elements to groups | |
| 956 | * @param mapper transformation applied to each element | |
| 957 | * @param <T> the input element type | |
| 958 | * @param <K> the classification key type | |
| 959 | * @param <R> the mapped element type | |
| 960 | * | |
| 961 | * @return a {@code Collector} producing a {@link Stream} of {@link Grouped} elements | |
| 962 | * computed in parallel while preserving input order | |
| 963 | * | |
| 964 | * @since 3.4.0 | |
| 965 | */ | |
| 966 | public static <T, K, R> Collector<T, ?, Stream<Grouped<K, R>>> parallelToOrderedStreamBy( | |
| 967 | Function<? super T, ? extends K> classifier, | |
| 968 | Function<? super T, ? extends R> mapper) { | |
| 969 | ||
| 970 |
1
1. parallelToOrderedStreamBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToOrderedStreamBy → KILLED |
return Factory.streamingBy(classifier, mapper, Configurer.streaming(Configurer.Streaming::ordered)); |
| 971 | } | |
| 972 | ||
| 973 | /** | |
| 974 | * A convenience {@link Collector} that performs parallel computations using Virtual Threads | |
| 975 | * while preserving the encounter order of the input elements. Results are emitted in the same | |
| 976 | * order as the corresponding elements were encountered, regardless of when individual tasks | |
| 977 | * complete. | |
| 978 | * <p> | |
| 979 | * Each element is submitted independently for asynchronous processing on Virtual Threads using | |
| 980 | * the provided {@code mapper}. Execution may proceed in parallel up to the configured | |
| 981 | * {@code parallelism}. When the parallelism is set to {@code 1}, all work is performed on the | |
| 982 | * calling thread. | |
| 983 | * <p> | |
| 984 | * Ordering guarantees: | |
| 985 | * <ul> | |
| 986 | * <li>The encounter order of input elements is preserved.</li> | |
| 987 | * <li>Parallel execution does not affect the final ordering of the resulting stream.</li> | |
| 988 | * </ul> | |
| 989 | * | |
| 990 | * <br> | |
| 991 | * Example: | |
| 992 | * <pre>{@code | |
| 993 | * Stream.of(1, 2, 3) | |
| 994 | * .collect(parallelToOrderedStream(i -> foo(i), 2)) | |
| 995 | * .forEach(System.out::println); | |
| 996 | * }</pre> | |
| 997 | * | |
| 998 | * @param mapper transformation applied to each element | |
| 999 | * @param parallelism the maximum degree of parallelism | |
| 1000 | * @param <T> the input element type | |
| 1001 | * @param <R> the mapped result type | |
| 1002 | * | |
| 1003 | * @return a {@code Collector} producing an ordered {@link Stream} of mapped results | |
| 1004 | * | |
| 1005 | * @since 3.2.0 | |
| 1006 | */ | |
| 1007 | public static <T, R> Collector<T, ?, Stream<R>> parallelToOrderedStream( | |
| 1008 | Function<? super T, ? extends R> mapper, | |
| 1009 | int parallelism) { | |
| 1010 |
1
1. parallelToOrderedStream : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToOrderedStream → KILLED |
return Factory.streaming(mapper, |
| 1011 | Configurer.streaming(c -> c | |
| 1012 | .ordered() | |
| 1013 | .parallelism(parallelism))); | |
| 1014 | } | |
| 1015 | ||
| 1016 | /** | |
| 1017 | * A convenience {@link Collector} that performs parallel computations using Virtual Threads | |
| 1018 | * while preserving the encounter order of both batches and the elements within each batch. | |
| 1019 | * <p> | |
| 1020 | * Incoming elements are partitioned using the provided {@code classifier}. Each partition | |
| 1021 | * (i.e., batch associated with a classification key) is processed as a unit. Although batches | |
| 1022 | * may execute in parallel up to the configured {@code parallelism}, their results are emitted | |
| 1023 | * strictly in encounter order. | |
| 1024 | * <p> | |
| 1025 | * Ordering guarantees: | |
| 1026 | * <ul> | |
| 1027 | * <li>Elements within a batch preserve their encounter order.</li> | |
| 1028 | * <li>Batches are emitted in the encounter order of their first element.</li> | |
| 1029 | * <li>Parallel execution does not affect the final ordering of the resulting stream.</li> | |
| 1030 | * </ul> | |
| 1031 | * <p> | |
| 1032 | * When {@code parallelism} is {@code 1}, all processing is performed on the calling thread. | |
| 1033 | * | |
| 1034 | * <br> | |
| 1035 | * Example: | |
| 1036 | * <pre>{@code | |
| 1037 | * Stream.of(t1, t2, t3) | |
| 1038 | * .collect(parallelToOrderedStreamBy(Task::groupId, t -> compute(t), 4)) | |
| 1039 | * .forEach(System.out::println); | |
| 1040 | * }</pre> | |
| 1041 | * | |
| 1042 | * @param classifier function that groups elements into batches | |
| 1043 | * @param mapper transformation applied to each element | |
| 1044 | * @param parallelism the maximum allowed parallelism | |
| 1045 | * @param <T> the input element type | |
| 1046 | * @param <K> the classification key type | |
| 1047 | * @param <R> the mapped result type | |
| 1048 | * | |
| 1049 | * @return a {@code Collector} producing an ordered {@link Stream} of {@link Grouped} results | |
| 1050 | * | |
| 1051 | * @since 3.4.0 | |
| 1052 | */ | |
| 1053 | public static <T, K, R> Collector<T, ?, Stream<Grouped<K, R>>> parallelToOrderedStreamBy( | |
| 1054 | Function<? super T, ? extends K> classifier, | |
| 1055 | Function<? super T, ? extends R> mapper, | |
| 1056 | int parallelism) { | |
| 1057 |
1
1. parallelToOrderedStreamBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToOrderedStreamBy → KILLED |
return Factory.streamingBy(classifier, mapper, |
| 1058 | Configurer.streaming(c -> c | |
| 1059 | .ordered() | |
| 1060 | .parallelism(parallelism))); | |
| 1061 | } | |
| 1062 | ||
| 1063 | /** | |
| 1064 | * A convenience {@link Collector} that performs parallel computations on a custom {@link Executor} | |
| 1065 | * while preserving the encounter order of the input elements. Results are emitted in the same order | |
| 1066 | * as the corresponding elements were encountered, regardless of when individual tasks complete. | |
| 1067 | * <p> | |
| 1068 | * Each element is submitted independently for asynchronous processing using the provided | |
| 1069 | * {@code mapper} and executed on the specified {@code executor}. Execution may proceed with | |
| 1070 | * effectively unlimited parallelism. When all work is performed on the calling thread | |
| 1071 | * ({@code parallelism} of 1), the stream behaves sequentially. | |
| 1072 | * <p> | |
| 1073 | * Ordering guarantees: | |
| 1074 | * <ul> | |
| 1075 | * <li>The encounter order of input elements is preserved.</li> | |
| 1076 | * <li>Parallel execution does not affect the final ordering of the resulting stream.</li> | |
| 1077 | * </ul> | |
| 1078 | * | |
| 1079 | * <br> | |
| 1080 | * Example: | |
| 1081 | * <pre>{@code | |
| 1082 | * Stream.of(1, 2, 3) | |
| 1083 | * .collect(parallelToOrderedStream(i -> foo(i), executor)) | |
| 1084 | * .forEach(System.out::println); | |
| 1085 | * }</pre> | |
| 1086 | * | |
| 1087 | * @param mapper transformation applied to each element | |
| 1088 | * @param executor the {@code Executor} used for asynchronous execution | |
| 1089 | * @param <T> the input element type | |
| 1090 | * @param <R> the mapped result type | |
| 1091 | * | |
| 1092 | * @return a {@code Collector} producing an ordered {@link Stream} of mapped results | |
| 1093 | * | |
| 1094 | * @since 3.3.0 | |
| 1095 | */ | |
| 1096 | public static <T, R> Collector<T, ?, Stream<R>> parallelToOrderedStream( | |
| 1097 | Function<? super T, ? extends R> mapper, | |
| 1098 | Executor executor) { | |
| 1099 |
1
1. parallelToOrderedStream : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToOrderedStream → KILLED |
return Factory.streaming(mapper, |
| 1100 | Configurer.streaming(c -> c | |
| 1101 | .ordered() | |
| 1102 | .executor(executor))); | |
| 1103 | } | |
| 1104 | ||
| 1105 | /** | |
| 1106 | * A convenience {@link Collector} that performs parallel computations by classifying elements | |
| 1107 | * into batches using the provided {@code classifier}, executed on a custom {@link Executor}, | |
| 1108 | * while preserving the encounter order of both batches and elements within each batch. | |
| 1109 | * <p> | |
| 1110 | * Each batch is processed as a unit on the specified executor. Results are emitted in the | |
| 1111 | * encounter order of the batches and the elements within them, even though batches may execute | |
| 1112 | * concurrently. | |
| 1113 | * <p> | |
| 1114 | * Ordering guarantees: | |
| 1115 | * <ul> | |
| 1116 | * <li>Elements within a batch preserve their encounter order.</li> | |
| 1117 | * <li>Batches are emitted in the encounter order of their first element.</li> | |
| 1118 | * </ul> | |
| 1119 | * | |
| 1120 | * <br> | |
| 1121 | * Example: | |
| 1122 | * <pre>{@code | |
| 1123 | * Stream.of(t1, t2, t3) | |
| 1124 | * .collect(parallelToOrderedStreamBy(Task::groupId, t -> compute(t), executor)) | |
| 1125 | * .forEach(System.out::println); | |
| 1126 | * }</pre> | |
| 1127 | * | |
| 1128 | * @param classifier function that assigns elements to groups; all elements with the same key | |
| 1129 | * are guaranteed to run on the same thread | |
| 1130 | * @param mapper transformation applied to each element | |
| 1131 | * @param executor the {@code Executor} used for asynchronous execution | |
| 1132 | * @param <T> the input element type | |
| 1133 | * @param <K> the classification key type | |
| 1134 | * @param <R> the mapped result type | |
| 1135 | * | |
| 1136 | * @return a {@code Collector} producing an ordered {@link Stream} of {@link Grouped} results | |
| 1137 | * | |
| 1138 | * @since 3.4.0 | |
| 1139 | */ | |
| 1140 | public static <T, K, R> Collector<T, ?, Stream<Grouped<K, R>>> parallelToOrderedStreamBy( | |
| 1141 | Function<? super T, ? extends K> classifier, | |
| 1142 | Function<? super T, ? extends R> mapper, | |
| 1143 | Executor executor) { | |
| 1144 |
1
1. parallelToOrderedStreamBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToOrderedStreamBy → KILLED |
return Factory.streamingBy(classifier, mapper, |
| 1145 | Configurer.streaming(c -> c | |
| 1146 | .ordered() | |
| 1147 | .executor(executor))); | |
| 1148 | } | |
| 1149 | ||
| 1150 | /** | |
| 1151 | * A convenience {@link Collector} that performs parallel computations on a custom {@link Executor} | |
| 1152 | * while preserving the encounter order of input elements. Results are emitted in the same order | |
| 1153 | * as the corresponding elements were encountered, regardless of completion order. | |
| 1154 | * <p> | |
| 1155 | * Each element is submitted independently for asynchronous processing using the provided | |
| 1156 | * {@code mapper} and executed on the specified {@code executor}. Execution may proceed in | |
| 1157 | * parallel up to the configured {@code parallelism}. When {@code parallelism} is {@code 1}, | |
| 1158 | * all work is executed on the calling thread. | |
| 1159 | * <p> | |
| 1160 | * Ordering guarantees: | |
| 1161 | * <ul> | |
| 1162 | * <li>The encounter order of input elements is preserved.</li> | |
| 1163 | * <li>Parallel execution does not affect the final ordering of the resulting stream.</li> | |
| 1164 | * </ul> | |
| 1165 | * | |
| 1166 | * <br> | |
| 1167 | * Example: | |
| 1168 | * <pre>{@code | |
| 1169 | * Stream.of(1, 2, 3) | |
| 1170 | * .collect(parallelToOrderedStream(i -> foo(i), executor, 2)) | |
| 1171 | * .forEach(System.out::println); | |
| 1172 | * }</pre> | |
| 1173 | * | |
| 1174 | * @param mapper transformation applied to each element | |
| 1175 | * @param executor the {@code Executor} used for asynchronous execution | |
| 1176 | * @param parallelism the maximum degree of parallelism | |
| 1177 | * @param <T> the input element type | |
| 1178 | * @param <R> the mapped result type | |
| 1179 | * | |
| 1180 | * @return a {@code Collector} producing an ordered {@link Stream} of mapped results | |
| 1181 | * | |
| 1182 | * @since 2.0.0 | |
| 1183 | */ | |
| 1184 | public static <T, R> Collector<T, ?, Stream<R>> parallelToOrderedStream( | |
| 1185 | Function<? super T, ? extends R> mapper, | |
| 1186 | Executor executor, | |
| 1187 | int parallelism) { | |
| 1188 | ||
| 1189 |
1
1. parallelToOrderedStream : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToOrderedStream → KILLED |
return Factory.streaming( |
| 1190 | mapper, Configurer.streaming(c -> c | |
| 1191 | .ordered() | |
| 1192 | .executor(executor) | |
| 1193 | .parallelism(parallelism)) | |
| 1194 | ); | |
| 1195 | } | |
| 1196 | ||
| 1197 | /** | |
| 1198 | * A convenience {@link Collector} that performs parallel computations by classifying elements | |
| 1199 | * into batches using the provided {@code classifier}, executed on a custom {@link Executor}, | |
| 1200 | * while preserving the encounter order of both batches and elements within each batch. | |
| 1201 | * <p> | |
| 1202 | * Each batch is processed as a unit on the specified executor. Results are emitted in the | |
| 1203 | * encounter order of batches and of elements within each batch, even though batches may execute | |
| 1204 | * concurrently up to the configured {@code parallelism}. | |
| 1205 | * <p> | |
| 1206 | * Ordering guarantees: | |
| 1207 | * <ul> | |
| 1208 | * <li>Elements within a batch preserve their encounter order.</li> | |
| 1209 | * <li>Batches are emitted in the encounter order of their first element.</li> | |
| 1210 | * </ul> | |
| 1211 | * | |
| 1212 | * <br> | |
| 1213 | * Example: | |
| 1214 | * <pre>{@code | |
| 1215 | * Stream.of(t1, t2, t3) | |
| 1216 | * .collect(parallelToOrderedStreamBy(Task::groupId, t -> compute(t), executor, 4)) | |
| 1217 | * .forEach(System.out::println); | |
| 1218 | * }</pre> | |
| 1219 | * | |
| 1220 | * @param classifier function that assigns elements to groups; all elements with the same key | |
| 1221 | * are guaranteed to run on the same thread | |
| 1222 | * @param mapper transformation applied to each element | |
| 1223 | * @param executor the {@code Executor} used for asynchronous execution | |
| 1224 | * @param parallelism the maximum allowed parallelism | |
| 1225 | * @param <T> the input element type | |
| 1226 | * @param <K> the classification key type | |
| 1227 | * @param <R> the mapped result type | |
| 1228 | * | |
| 1229 | * @return a {@code Collector} producing an ordered {@link Stream} of {@link Grouped} results | |
| 1230 | * | |
| 1231 | * @since 3.4.0 | |
| 1232 | */ | |
| 1233 | public static <T, K, R> Collector<T, ?, Stream<Grouped<K, R>>> parallelToOrderedStreamBy( | |
| 1234 | Function<? super T, ? extends K> classifier, | |
| 1235 | Function<? super T, ? extends R> mapper, | |
| 1236 | Executor executor, | |
| 1237 | int parallelism) { | |
| 1238 | ||
| 1239 |
1
1. parallelToOrderedStreamBy : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::parallelToOrderedStreamBy → KILLED |
return Factory.streamingBy(classifier, mapper, |
| 1240 | Configurer.streaming(c -> c | |
| 1241 | .ordered() | |
| 1242 | .executor(executor) | |
| 1243 | .parallelism(parallelism))); | |
| 1244 | } | |
| 1245 | ||
| 1246 | /** | |
| 1247 | * A convenience {@code Collector} for collecting a {@code Stream<CompletableFuture<T>>} | |
| 1248 | * into a {@code CompletableFuture<R>} using a provided {@code Collector<T, ?, R>} | |
| 1249 | * | |
| 1250 | * @param collector the {@code Collector} describing the reduction | |
| 1251 | * @param <T> the type of the collected elements | |
| 1252 | * @param <R> the result of the transformation | |
| 1253 | * | |
| 1254 | * @return a {@code Collector} which collects all futures and combines them into a single future | |
| 1255 | * using the provided downstream {@code Collector} | |
| 1256 | * | |
| 1257 | * @since 2.3.0 | |
| 1258 | */ | |
| 1259 | public static <T, R> Collector<CompletableFuture<T>, ?, CompletableFuture<R>> toFuture(Collector<T, ?, R> collector) { | |
| 1260 |
1
1. toFuture : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::toFuture → KILLED |
return FutureCollectors.toFuture(collector); |
| 1261 | } | |
| 1262 | ||
| 1263 | /** | |
| 1264 | * A convenience {@code Collector} for collecting a {@code Stream<CompletableFuture<T>>} into a {@code CompletableFuture<List<T>>} | |
| 1265 | * | |
| 1266 | * @param <T> the type of the collected elements | |
| 1267 | * | |
| 1268 | * @return a {@code Collector} which collects all futures and combines them into a single future | |
| 1269 | * returning a list of results | |
| 1270 | * | |
| 1271 | * @since 2.3.0 | |
| 1272 | */ | |
| 1273 | public static <T> Collector<CompletableFuture<T>, ?, CompletableFuture<List<T>>> toFuture() { | |
| 1274 |
1
1. toFuture : replaced return value with null for com/pivovarit/collectors/ParallelCollectors::toFuture → KILLED |
return FutureCollectors.toFuture(); |
| 1275 | } | |
| 1276 | ||
| 1277 | /** | |
| 1278 | * A subset of collectors which perform operations in batches and not separately (one object in a thread pool's worker queue represents a batch of operations to be performed by a single thread) | |
| 1279 | */ | |
| 1280 | @Deprecated(forRemoval = true) | |
| 1281 | public static final class Batching { | |
| 1282 | ||
| 1283 | private Batching() { | |
| 1284 | } | |
| 1285 | ||
| 1286 | /** | |
| 1287 | * A convenience {@link Collector} used for executing parallel computations on a custom {@link Executor} | |
| 1288 | * and returning them as a {@link CompletableFuture} containing a result of the application of the user-provided {@link Collector}. | |
| 1289 | * | |
| 1290 | * <br> | |
| 1291 | * Example: | |
| 1292 | * <pre>{@code | |
| 1293 | * CompletableFuture<List<String>> result = Stream.of(1, 2, 3) | |
| 1294 | * .collect(parallel(i -> foo(i), toList(), executor, 2)); | |
| 1295 | * }</pre> | |
| 1296 | * | |
| 1297 | * @param mapper a transformation to be performed in parallel | |
| 1298 | * @param collector the {@code Collector} describing the reduction | |
| 1299 | * @param executor the {@code Executor} to use for asynchronous execution | |
| 1300 | * @param parallelism the max parallelism level | |
| 1301 | * @param <T> the type of the collected elements | |
| 1302 | * @param <R> the result returned by {@code mapper} | |
| 1303 | * @param <RR> the reduction result {@code collector} | |
| 1304 | * | |
| 1305 | * @return a {@code Collector} which collects all processed elements into a user-provided mutable {@code Collection} in parallel | |
| 1306 | * | |
| 1307 | * @since 2.1.0 | |
| 1308 | */ | |
| 1309 | public static <T, R, RR> Collector<T, ?, CompletableFuture<RR>> parallel(Function<? super T, ? extends R> mapper, Collector<R, ?, RR> collector, Executor executor, int parallelism) { | |
| 1310 | Objects.requireNonNull(collector, "collector cannot be null"); | |
| 1311 |
2
1. lambda$parallel$0 : replaced return value with null for com/pivovarit/collectors/ParallelCollectors$Batching::lambda$parallel$0 → KILLED 2. parallel : replaced return value with null for com/pivovarit/collectors/ParallelCollectors$Batching::parallel → KILLED |
return Factory.collecting(s -> s.collect(collector), mapper, |
| 1312 | Configurer.collecting(c -> c | |
| 1313 | .batching() | |
| 1314 | .executor(executor) | |
| 1315 | .parallelism(parallelism))); | |
| 1316 | } | |
| 1317 | ||
| 1318 | /** | |
| 1319 | * A convenience {@link Collector} used for executing parallel computations on a custom {@link Executor} | |
| 1320 | * and returning them as {@link CompletableFuture} containing a {@link Stream} of these elements. | |
| 1321 | * | |
| 1322 | * <br><br> | |
| 1323 | * The collector maintains the order of processed {@link Stream}. Instances should not be reused. | |
| 1324 | * | |
| 1325 | * <br> | |
| 1326 | * Example: | |
| 1327 | * <pre>{@code | |
| 1328 | * CompletableFuture<Stream<String>> result = Stream.of(1, 2, 3) | |
| 1329 | * .collect(parallel(i -> foo(), executor, 2)); | |
| 1330 | * }</pre> | |
| 1331 | * | |
| 1332 | * @param mapper a transformation to be performed in parallel | |
| 1333 | * @param executor the {@code Executor} to use for asynchronous execution | |
| 1334 | * @param parallelism the max parallelism level | |
| 1335 | * @param <T> the type of the collected elements | |
| 1336 | * @param <R> the result returned by {@code mapper} | |
| 1337 | * | |
| 1338 | * @return a {@code Collector} which collects all processed elements into a {@code Stream} in parallel | |
| 1339 | * | |
| 1340 | * @since 2.1.0 | |
| 1341 | */ | |
| 1342 | public static <T, R> Collector<T, ?, CompletableFuture<Stream<R>>> parallel(Function<? super T, ? extends R> mapper, Executor executor, int parallelism) { | |
| 1343 |
2
1. lambda$parallel$2 : replaced return value with Stream.empty for com/pivovarit/collectors/ParallelCollectors$Batching::lambda$parallel$2 → SURVIVED 2. parallel : replaced return value with null for com/pivovarit/collectors/ParallelCollectors$Batching::parallel → KILLED |
return Factory.collecting((Function<Stream<R>, Stream<R>>) i -> i, mapper, |
| 1344 | Configurer.collecting(c -> c | |
| 1345 | .batching() | |
| 1346 | .executor(executor) | |
| 1347 | .parallelism(parallelism))); | |
| 1348 | } | |
| 1349 | ||
| 1350 | /** | |
| 1351 | * A convenience {@link Collector} used for executing parallel computations on a custom {@link Executor} | |
| 1352 | * and returning a {@link Stream} instance returning results as they arrive. | |
| 1353 | * <p> | |
| 1354 | * For the parallelism of 1, the stream is executed by the calling thread. | |
| 1355 | * | |
| 1356 | * <br> | |
| 1357 | * Example: | |
| 1358 | * <pre>{@code | |
| 1359 | * Stream.of(1, 2, 3) | |
| 1360 | * .collect(parallelToStream(i -> foo(), executor, 2)) | |
| 1361 | * .forEach(System.out::println); | |
| 1362 | * }</pre> | |
| 1363 | * | |
| 1364 | * @param mapper a transformation to be performed in parallel | |
| 1365 | * @param executor the {@code Executor} to use for asynchronous execution | |
| 1366 | * @param parallelism the max parallelism level | |
| 1367 | * @param <T> the type of the collected elements | |
| 1368 | * @param <R> the result returned by {@code mapper} | |
| 1369 | * | |
| 1370 | * @return a {@code Collector} which collects all processed elements into a {@code Stream} in parallel | |
| 1371 | * | |
| 1372 | * @since 2.1.0 | |
| 1373 | */ | |
| 1374 | public static <T, R> Collector<T, ?, Stream<R>> parallelToStream(Function<? super T, ? extends R> mapper, Executor executor, int parallelism) { | |
| 1375 |
1
1. parallelToStream : replaced return value with null for com/pivovarit/collectors/ParallelCollectors$Batching::parallelToStream → KILLED |
return Factory.streaming(mapper, |
| 1376 | Configurer.streaming(c -> c | |
| 1377 | .batching() | |
| 1378 | .executor(executor) | |
| 1379 | .parallelism(parallelism))); | |
| 1380 | } | |
| 1381 | ||
| 1382 | /** | |
| 1383 | * A convenience {@link Collector} used for executing parallel computations on a custom {@link Executor} | |
| 1384 | * and returning a {@link Stream} instance returning results as they arrive while maintaining the initial order. | |
| 1385 | * <p> | |
| 1386 | * For the parallelism of 1, the stream is executed by the calling thread. | |
| 1387 | * | |
| 1388 | * <br> | |
| 1389 | * Example: | |
| 1390 | * <pre>{@code | |
| 1391 | * Stream.of(1, 2, 3) | |
| 1392 | * .collect(parallelToOrderedStream(i -> foo(), executor, 2)) | |
| 1393 | * .forEach(System.out::println); | |
| 1394 | * }</pre> | |
| 1395 | * | |
| 1396 | * @param mapper a transformation to be performed in parallel | |
| 1397 | * @param executor the {@code Executor} to use for asynchronous execution | |
| 1398 | * @param parallelism the max parallelism level | |
| 1399 | * @param <T> the type of the collected elements | |
| 1400 | * @param <R> the result returned by {@code mapper} | |
| 1401 | * | |
| 1402 | * @return a {@code Collector} which collects all processed elements into a {@code Stream} in parallel | |
| 1403 | * | |
| 1404 | * @since 2.1.0 | |
| 1405 | */ | |
| 1406 | public static <T, R> Collector<T, ?, Stream<R>> parallelToOrderedStream(Function<? super T, ? extends R> mapper, Executor executor, int parallelism) { | |
| 1407 |
1
1. parallelToOrderedStream : replaced return value with null for com/pivovarit/collectors/ParallelCollectors$Batching::parallelToOrderedStream → KILLED |
return Factory.streaming(mapper, |
| 1408 | Configurer.streaming(c -> c | |
| 1409 | .ordered() | |
| 1410 | .batching() | |
| 1411 | .executor(executor) | |
| 1412 | .parallelism(parallelism))); | |
| 1413 | } | |
| 1414 | } | |
| 1415 | } | |
Mutations | ||
| 68 |
1.1 2.2 |
|
| 108 |
1.1 2.2 |
|
| 143 |
1.1 2.2 |
|
| 187 |
1.1 2.2 |
|
| 224 |
1.1 2.2 |
|
| 271 |
1.1 2.2 |
|
| 309 |
1.1 2.2 |
|
| 353 |
1.1 2.2 |
|
| 381 |
1.1 2.2 |
|
| 415 |
1.1 |
|
| 444 |
1.1 2.2 |
|
| 480 |
1.1 |
|
| 512 |
1.1 2.2 |
|
| 552 |
1.1 |
|
| 586 |
1.1 2.2 |
|
| 622 |
1.1 |
|
| 650 |
1.1 |
|
| 684 |
1.1 |
|
| 714 |
1.1 |
|
| 751 |
1.1 |
|
| 781 |
1.1 |
|
| 817 |
1.1 |
|
| 852 |
1.1 |
|
| 898 |
1.1 |
|
| 929 |
1.1 |
|
| 970 |
1.1 |
|
| 1010 |
1.1 |
|
| 1057 |
1.1 |
|
| 1099 |
1.1 |
|
| 1144 |
1.1 |
|
| 1189 |
1.1 |
|
| 1239 |
1.1 |
|
| 1260 |
1.1 |
|
| 1274 |
1.1 |
|
| 1311 |
1.1 2.2 |
|
| 1343 |
1.1 2.2 |
|
| 1375 |
1.1 |
|
| 1407 |
1.1 |