| 1 | package com.pivovarit.collectors; | |
| 2 | ||
| 3 | import java.util.ArrayList; | |
| 4 | import java.util.Collection; | |
| 5 | import java.util.EnumSet; | |
| 6 | import java.util.List; | |
| 7 | import java.util.Set; | |
| 8 | import java.util.concurrent.CompletableFuture; | |
| 9 | import java.util.concurrent.Executor; | |
| 10 | import java.util.function.BiConsumer; | |
| 11 | import java.util.function.BinaryOperator; | |
| 12 | import java.util.function.Function; | |
| 13 | import java.util.function.Supplier; | |
| 14 | import java.util.stream.Collector; | |
| 15 | import java.util.stream.Stream; | |
| 16 | ||
| 17 | import static com.pivovarit.collectors.AsyncParallelCollector.requireValidParallelism; | |
| 18 | import static com.pivovarit.collectors.BatchingSpliterator.batching; | |
| 19 | import static com.pivovarit.collectors.BatchingSpliterator.partitioned; | |
| 20 | import static com.pivovarit.collectors.CompletionStrategy.ordered; | |
| 21 | import static com.pivovarit.collectors.CompletionStrategy.unordered; | |
| 22 | import static java.util.Collections.emptySet; | |
| 23 | import static java.util.Objects.requireNonNull; | |
| 24 | import static java.util.stream.Collectors.collectingAndThen; | |
| 25 | import static java.util.stream.Collectors.toList; | |
| 26 | ||
| 27 | /** | |
| 28 | * @author Grzegorz Piwowarek | |
| 29 | */ | |
| 30 | class ParallelStreamCollector<T, R> implements Collector<T, List<CompletableFuture<R>>, Stream<R>> { | |
| 31 | ||
| 32 | private static final EnumSet<Characteristics> UNORDERED = EnumSet.of(Characteristics.UNORDERED); | |
| 33 | ||
| 34 | private final Function<T, R> function; | |
| 35 | ||
| 36 | private final CompletionStrategy<R> completionStrategy; | |
| 37 | ||
| 38 | private final Set<Characteristics> characteristics; | |
| 39 | ||
| 40 | private final Dispatcher<R> dispatcher; | |
| 41 | ||
| 42 | private ParallelStreamCollector( | |
| 43 | Function<T, R> function, | |
| 44 | CompletionStrategy<R> completionStrategy, | |
| 45 | Set<Characteristics> characteristics, | |
| 46 | Dispatcher<R> dispatcher) { | |
| 47 | this.completionStrategy = completionStrategy; | |
| 48 | this.characteristics = characteristics; | |
| 49 | this.dispatcher = dispatcher; | |
| 50 | this.function = function; | |
| 51 | } | |
| 52 | ||
| 53 | @Override | |
| 54 | public Supplier<List<CompletableFuture<R>>> supplier() { | |
| 55 |
1
1. supplier : replaced return value with null for com/pivovarit/collectors/ParallelStreamCollector::supplier → KILLED |
return ArrayList::new; |
| 56 | } | |
| 57 | ||
| 58 | @Override | |
| 59 | public BiConsumer<List<CompletableFuture<R>>, T> accumulator() { | |
| 60 |
2
1. lambda$accumulator$0 : replaced return value with null for com/pivovarit/collectors/ParallelStreamCollector::lambda$accumulator$0 → KILLED 2. accumulator : replaced return value with null for com/pivovarit/collectors/ParallelStreamCollector::accumulator → KILLED |
return (acc, e) -> acc.add(dispatcher.enqueue(() -> function.apply(e))); |
| 61 | } | |
| 62 | ||
| 63 | @Override | |
| 64 | public BinaryOperator<List<CompletableFuture<R>>> combiner() { | |
| 65 |
1
1. combiner : replaced return value with null for com/pivovarit/collectors/ParallelStreamCollector::combiner → SURVIVED |
return (left, right) -> { |
| 66 | throw new UnsupportedOperationException( | |
| 67 | "Using parallel stream with parallel collectors is a bad idea"); | |
| 68 | }; | |
| 69 | } | |
| 70 | ||
| 71 | @Override | |
| 72 | public Function<List<CompletableFuture<R>>, Stream<R>> finisher() { | |
| 73 |
1
1. finisher : replaced return value with null for com/pivovarit/collectors/ParallelStreamCollector::finisher → KILLED |
return completionStrategy; |
| 74 | } | |
| 75 | ||
| 76 | @Override | |
| 77 | public Set<Characteristics> characteristics() { | |
| 78 |
1
1. characteristics : replaced return value with Collections.emptySet for com/pivovarit/collectors/ParallelStreamCollector::characteristics → SURVIVED |
return characteristics; |
| 79 | } | |
| 80 | ||
| 81 | static <T, R> Collector<T, ?, Stream<R>> streaming(Function<T, R> mapper) { | |
| 82 | requireNonNull(mapper, "mapper can't be null"); | |
| 83 | ||
| 84 |
1
1. streaming : replaced return value with null for com/pivovarit/collectors/ParallelStreamCollector::streaming → KILLED |
return new ParallelStreamCollector<>(mapper, unordered(), UNORDERED, Dispatcher.virtual()); |
| 85 | } | |
| 86 | ||
| 87 | static <T, R> Collector<T, ?, Stream<R>> streaming(Function<T, R> mapper, Executor executor, int parallelism) { | |
| 88 | requireNonNull(executor, "executor can't be null"); | |
| 89 | requireNonNull(mapper, "mapper can't be null"); | |
| 90 |
1
1. streaming : removed call to com/pivovarit/collectors/AsyncParallelCollector::requireValidParallelism → KILLED |
requireValidParallelism(parallelism); |
| 91 | ||
| 92 |
1
1. streaming : replaced return value with null for com/pivovarit/collectors/ParallelStreamCollector::streaming → KILLED |
return new ParallelStreamCollector<>(mapper, unordered(), UNORDERED, Dispatcher.from(executor, parallelism)); |
| 93 | } | |
| 94 | ||
| 95 | static <T, R> Collector<T, ?, Stream<R>> streamingOrdered(Function<T, R> mapper) { | |
| 96 | requireNonNull(mapper, "mapper can't be null"); | |
| 97 | ||
| 98 |
1
1. streamingOrdered : replaced return value with null for com/pivovarit/collectors/ParallelStreamCollector::streamingOrdered → KILLED |
return new ParallelStreamCollector<>(mapper, ordered(), emptySet(), Dispatcher.virtual()); |
| 99 | } | |
| 100 | ||
| 101 | static <T, R> Collector<T, ?, Stream<R>> streamingOrdered(Function<T, R> mapper, Executor executor, | |
| 102 | int parallelism) { | |
| 103 | requireNonNull(executor, "executor can't be null"); | |
| 104 | requireNonNull(mapper, "mapper can't be null"); | |
| 105 |
1
1. streamingOrdered : removed call to com/pivovarit/collectors/AsyncParallelCollector::requireValidParallelism → KILLED |
requireValidParallelism(parallelism); |
| 106 | ||
| 107 |
1
1. streamingOrdered : replaced return value with null for com/pivovarit/collectors/ParallelStreamCollector::streamingOrdered → KILLED |
return new ParallelStreamCollector<>(mapper, ordered(), emptySet(), Dispatcher.from(executor, parallelism)); |
| 108 | } | |
| 109 | ||
| 110 | static final class BatchingCollectors { | |
| 111 | ||
| 112 | private BatchingCollectors() { | |
| 113 | } | |
| 114 | ||
| 115 | static <T, R> Collector<T, ?, Stream<R>> streaming(Function<T, R> mapper, Executor executor, | |
| 116 | int parallelism) { | |
| 117 | requireNonNull(executor, "executor can't be null"); | |
| 118 | requireNonNull(mapper, "mapper can't be null"); | |
| 119 |
1
1. streaming : removed call to com/pivovarit/collectors/AsyncParallelCollector::requireValidParallelism → KILLED |
requireValidParallelism(parallelism); |
| 120 | ||
| 121 |
2
1. streaming : negated conditional → KILLED 2. streaming : replaced return value with null for com/pivovarit/collectors/ParallelStreamCollector$BatchingCollectors::streaming → KILLED |
return parallelism == 1 |
| 122 | ? syncCollector(mapper) | |
| 123 | : batchingCollector(mapper, executor, parallelism); | |
| 124 | } | |
| 125 | ||
| 126 | static <T, R> Collector<T, ?, Stream<R>> streamingOrdered(Function<T, R> mapper, Executor executor, | |
| 127 | int parallelism) { | |
| 128 | requireNonNull(executor, "executor can't be null"); | |
| 129 | requireNonNull(mapper, "mapper can't be null"); | |
| 130 |
1
1. streamingOrdered : removed call to com/pivovarit/collectors/AsyncParallelCollector::requireValidParallelism → KILLED |
requireValidParallelism(parallelism); |
| 131 | ||
| 132 |
2
1. streamingOrdered : replaced return value with null for com/pivovarit/collectors/ParallelStreamCollector$BatchingCollectors::streamingOrdered → KILLED 2. streamingOrdered : negated conditional → KILLED |
return parallelism == 1 |
| 133 | ? syncCollector(mapper) | |
| 134 | : batchingCollector(mapper, executor, parallelism); | |
| 135 | } | |
| 136 | ||
| 137 | private static <T, R> Collector<T, ?, Stream<R>> batchingCollector(Function<T, R> mapper, | |
| 138 | Executor executor, int parallelism) { | |
| 139 |
1
1. batchingCollector : replaced return value with null for com/pivovarit/collectors/ParallelStreamCollector$BatchingCollectors::batchingCollector → KILLED |
return collectingAndThen( |
| 140 | toList(), | |
| 141 | list -> { | |
| 142 | // no sense to repack into batches of size 1 | |
| 143 |
1
1. lambda$batchingCollector$1 : negated conditional → KILLED |
if (list.size() == parallelism) { |
| 144 |
1
1. lambda$batchingCollector$1 : replaced return value with Stream.empty for com/pivovarit/collectors/ParallelStreamCollector$BatchingCollectors::lambda$batchingCollector$1 → KILLED |
return list.stream() |
| 145 | .collect(new ParallelStreamCollector<>( | |
| 146 | mapper, | |
| 147 | ordered(), | |
| 148 | emptySet(), | |
| 149 | Dispatcher.from(executor, parallelism))); | |
| 150 | } | |
| 151 | else { | |
| 152 |
1
1. lambda$batchingCollector$1 : replaced return value with Stream.empty for com/pivovarit/collectors/ParallelStreamCollector$BatchingCollectors::lambda$batchingCollector$1 → KILLED |
return partitioned(list, parallelism) |
| 153 | .collect(collectingAndThen(new ParallelStreamCollector<>( | |
| 154 | batching(mapper), | |
| 155 | ordered(), | |
| 156 | emptySet(), | |
| 157 | Dispatcher.from(executor, parallelism)), | |
| 158 |
1
1. lambda$batchingCollector$0 : replaced return value with Stream.empty for com/pivovarit/collectors/ParallelStreamCollector$BatchingCollectors::lambda$batchingCollector$0 → KILLED |
s -> s.flatMap(Collection::stream))); |
| 159 | } | |
| 160 | }); | |
| 161 | } | |
| 162 | ||
| 163 | private static <T, R> Collector<T, Stream.Builder<R>, Stream<R>> syncCollector(Function<T, R> mapper) { | |
| 164 |
1
1. syncCollector : replaced return value with null for com/pivovarit/collectors/ParallelStreamCollector$BatchingCollectors::syncCollector → KILLED |
return Collector.of(Stream::builder, (rs, t) -> rs.add(mapper.apply(t)), (rs, rs2) -> { |
| 165 | throw new UnsupportedOperationException( | |
| 166 | "Using parallel stream with parallel collectors is a bad idea"); | |
| 167 | }, Stream.Builder::build); | |
| 168 | } | |
| 169 | ||
| 170 | } | |
| 171 | ||
| 172 | } | |
Mutations | ||
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