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A general and simple library for Android
/*
* Copyright (C) 2016, 2017, 2018, 2019 HaiYang Li
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package com.landawn.abacus.util.stream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Deque;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import com.landawn.abacus.util.AsyncExecutor;
import com.landawn.abacus.util.ContinuableFuture;
import com.landawn.abacus.util.IntIterator;
import com.landawn.abacus.util.MutableBoolean;
import com.landawn.abacus.util.MutableLong;
import com.landawn.abacus.util.N;
import com.landawn.abacus.util.Nth;
import com.landawn.abacus.util.Pair;
import com.landawn.abacus.util.Try;
import com.landawn.abacus.util.u.Holder;
import com.landawn.abacus.util.u.OptionalInt;
import com.landawn.abacus.util.function.BiConsumer;
import com.landawn.abacus.util.function.BinaryOperator;
import com.landawn.abacus.util.function.Consumer;
import com.landawn.abacus.util.function.Function;
import com.landawn.abacus.util.function.IntBiFunction;
import com.landawn.abacus.util.function.IntBinaryOperator;
import com.landawn.abacus.util.function.IntConsumer;
import com.landawn.abacus.util.function.IntFunction;
import com.landawn.abacus.util.function.IntPredicate;
import com.landawn.abacus.util.function.IntTernaryOperator;
import com.landawn.abacus.util.function.IntToByteFunction;
import com.landawn.abacus.util.function.IntToCharFunction;
import com.landawn.abacus.util.function.IntToDoubleFunction;
import com.landawn.abacus.util.function.IntToFloatFunction;
import com.landawn.abacus.util.function.IntToLongFunction;
import com.landawn.abacus.util.function.IntToShortFunction;
import com.landawn.abacus.util.function.IntUnaryOperator;
import com.landawn.abacus.util.function.ObjIntConsumer;
import com.landawn.abacus.util.function.Predicate;
import com.landawn.abacus.util.function.Supplier;
import com.landawn.abacus.util.function.ToByteFunction;
import com.landawn.abacus.util.function.ToCharFunction;
import com.landawn.abacus.util.function.ToDoubleFunction;
import com.landawn.abacus.util.function.ToFloatFunction;
import com.landawn.abacus.util.function.ToIntFunction;
import com.landawn.abacus.util.function.ToLongFunction;
import com.landawn.abacus.util.function.ToShortFunction;
/**
*
*/
final class ParallelIteratorIntStream extends IteratorIntStream {
private final int maxThreadNum;
private final Splitor splitor;
private final AsyncExecutor asyncExecutor;
private volatile IteratorIntStream sequential;
private volatile Stream boxed;
ParallelIteratorIntStream(final IntIterator values, final boolean sorted, final int maxThreadNum, final Splitor splitor, final AsyncExecutor asyncExector,
final Collection closeHandlers) {
super(values, sorted, closeHandlers);
this.maxThreadNum = checkMaxThreadNum(maxThreadNum);
this.splitor = splitor == null ? DEFAULT_SPLITOR : splitor;
this.asyncExecutor = asyncExector == null ? DEFAULT_ASYNC_EXECUTOR : asyncExector;
}
ParallelIteratorIntStream(final IntStream stream, final boolean sorted, final int maxThreadNum, final Splitor splitor, final AsyncExecutor asyncExector,
final Deque closeHandlers) {
this(stream.iteratorEx(), sorted, maxThreadNum, splitor, asyncExector, mergeCloseHandlers(stream, closeHandlers));
}
ParallelIteratorIntStream(final Stream stream, final boolean sorted, final int maxThreadNum, final Splitor splitor,
final AsyncExecutor asyncExector, final Deque closeHandlers) {
this(intIterator(stream.iteratorEx()), sorted, maxThreadNum, splitor, asyncExector, mergeCloseHandlers(stream, closeHandlers));
}
@Override
public IntStream filter(final IntPredicate predicate) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.filter(predicate);
}
final Stream stream = boxed().filter(new Predicate() {
@Override
public boolean test(Integer value) {
return predicate.test(value);
}
});
return new ParallelIteratorIntStream(stream, false, maxThreadNum, splitor, asyncExecutor, closeHandlers);
}
@Override
public IntStream takeWhile(final IntPredicate predicate) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.takeWhile(predicate);
}
final Stream stream = boxed().takeWhile(new Predicate() {
@Override
public boolean test(Integer value) {
return predicate.test(value);
}
});
return new ParallelIteratorIntStream(stream, false, maxThreadNum, splitor, asyncExecutor, closeHandlers);
}
@Override
public IntStream dropWhile(final IntPredicate predicate) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.dropWhile(predicate);
}
final Stream stream = boxed().dropWhile(new Predicate() {
@Override
public boolean test(Integer value) {
return predicate.test(value);
}
});
return new ParallelIteratorIntStream(stream, false, maxThreadNum, splitor, asyncExecutor, closeHandlers);
}
@Override
public IntStream map(final IntUnaryOperator mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.map(mapper);
}
final IntStream stream = boxed().mapToInt(new ToIntFunction() {
@Override
public int applyAsInt(Integer value) {
return mapper.applyAsInt(value);
}
});
return new ParallelIteratorIntStream(stream, false, maxThreadNum, splitor, asyncExecutor, closeHandlers);
}
@Override
public CharStream mapToChar(final IntToCharFunction mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.mapToChar(mapper);
}
final CharStream stream = boxed().mapToChar(new ToCharFunction() {
@Override
public char applyAsChar(Integer value) {
return mapper.applyAsChar(value);
}
});
return new ParallelIteratorCharStream(stream, false, maxThreadNum, splitor, asyncExecutor, closeHandlers);
}
@Override
public ByteStream mapToByte(final IntToByteFunction mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.mapToByte(mapper);
}
final ByteStream stream = boxed().mapToByte(new ToByteFunction() {
@Override
public byte applyAsByte(Integer value) {
return mapper.applyAsByte(value);
}
});
return new ParallelIteratorByteStream(stream, false, maxThreadNum, splitor, asyncExecutor, closeHandlers);
}
@Override
public ShortStream mapToShort(final IntToShortFunction mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.mapToShort(mapper);
}
final ShortStream stream = boxed().mapToShort(new ToShortFunction() {
@Override
public short applyAsShort(Integer value) {
return mapper.applyAsShort(value);
}
});
return new ParallelIteratorShortStream(stream, false, maxThreadNum, splitor, asyncExecutor, closeHandlers);
}
@Override
public LongStream mapToLong(final IntToLongFunction mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.mapToLong(mapper);
}
final LongStream stream = boxed().mapToLong(new ToLongFunction() {
@Override
public long applyAsLong(Integer value) {
return mapper.applyAsLong(value);
}
});
return new ParallelIteratorLongStream(stream, false, maxThreadNum, splitor, asyncExecutor, closeHandlers);
}
@Override
public FloatStream mapToFloat(final IntToFloatFunction mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.mapToFloat(mapper);
}
final FloatStream stream = boxed().mapToFloat(new ToFloatFunction() {
@Override
public float applyAsFloat(Integer value) {
return mapper.applyAsFloat(value);
}
});
return new ParallelIteratorFloatStream(stream, false, maxThreadNum, splitor, asyncExecutor, closeHandlers);
}
@Override
public DoubleStream mapToDouble(final IntToDoubleFunction mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.mapToDouble(mapper);
}
final DoubleStream stream = boxed().mapToDouble(new ToDoubleFunction() {
@Override
public double applyAsDouble(Integer value) {
return mapper.applyAsDouble(value);
}
});
return new ParallelIteratorDoubleStream(stream, false, maxThreadNum, splitor, asyncExecutor, closeHandlers);
}
@Override
public Stream mapToObj(final IntFunction mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.mapToObj(mapper);
}
return boxed().map(new Function() {
@Override
public U apply(Integer value) {
return mapper.apply(value);
}
});
}
@Override
public IntStream flatMap(final IntFunction mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return new ParallelIteratorIntStream(sequential().flatMap(mapper), false, maxThreadNum, splitor, asyncExecutor, null);
}
final IntStream stream = boxed().flatMapToInt(new Function() {
@Override
public IntStream apply(Integer value) {
return mapper.apply(value);
}
});
return new ParallelIteratorIntStream(stream, false, maxThreadNum, splitor, asyncExecutor, null);
}
@Override
public CharStream flatMapToChar(final IntFunction mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return new ParallelIteratorCharStream(sequential().flatMapToChar(mapper), false, maxThreadNum, splitor, asyncExecutor, null);
}
final CharStream stream = boxed().flatMapToChar(new Function() {
@Override
public CharStream apply(Integer value) {
return mapper.apply(value);
}
});
return new ParallelIteratorCharStream(stream, false, maxThreadNum, splitor, asyncExecutor, null);
}
@Override
public ByteStream flatMapToByte(final IntFunction mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return new ParallelIteratorByteStream(sequential().flatMapToByte(mapper), false, maxThreadNum, splitor, asyncExecutor, null);
}
final ByteStream stream = boxed().flatMapToByte(new Function() {
@Override
public ByteStream apply(Integer value) {
return mapper.apply(value);
}
});
return new ParallelIteratorByteStream(stream, false, maxThreadNum, splitor, asyncExecutor, null);
}
@Override
public ShortStream flatMapToShort(final IntFunction mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return new ParallelIteratorShortStream(sequential().flatMapToShort(mapper), false, maxThreadNum, splitor, asyncExecutor, null);
}
final ShortStream stream = boxed().flatMapToShort(new Function() {
@Override
public ShortStream apply(Integer value) {
return mapper.apply(value);
}
});
return new ParallelIteratorShortStream(stream, false, maxThreadNum, splitor, asyncExecutor, null);
}
@Override
public LongStream flatMapToLong(final IntFunction mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return new ParallelIteratorLongStream(sequential().flatMapToLong(mapper), false, maxThreadNum, splitor, asyncExecutor, null);
}
final LongStream stream = boxed().flatMapToLong(new Function() {
@Override
public LongStream apply(Integer value) {
return mapper.apply(value);
}
});
return new ParallelIteratorLongStream(stream, false, maxThreadNum, splitor, asyncExecutor, null);
}
@Override
public FloatStream flatMapToFloat(final IntFunction mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return new ParallelIteratorFloatStream(sequential().flatMapToFloat(mapper), false, maxThreadNum, splitor, asyncExecutor, null);
}
final FloatStream stream = boxed().flatMapToFloat(new Function() {
@Override
public FloatStream apply(Integer value) {
return mapper.apply(value);
}
});
return new ParallelIteratorFloatStream(stream, false, maxThreadNum, splitor, asyncExecutor, null);
}
@Override
public DoubleStream flatMapToDouble(final IntFunction mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return new ParallelIteratorDoubleStream(sequential().flatMapToDouble(mapper), false, maxThreadNum, splitor, asyncExecutor, null);
}
final DoubleStream stream = boxed().flatMapToDouble(new Function() {
@Override
public DoubleStream apply(Integer value) {
return mapper.apply(value);
}
});
return new ParallelIteratorDoubleStream(stream, false, maxThreadNum, splitor, asyncExecutor, null);
}
@Override
public Stream flatMapToObj(final IntFunction> mapper) {
assertNotClosed();
if (maxThreadNum <= 1) {
return new ParallelIteratorStream<>(sequential().flatMapToObj(mapper), false, null, maxThreadNum, splitor, asyncExecutor, null);
}
return boxed().flatMap(new Function>() {
@Override
public Stream apply(Integer value) {
return mapper.apply(value);
}
});
}
@Override
public IntStream peek(final IntConsumer action) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.peek(action);
}
final IntStream stream = boxed().peek(new Consumer() {
@Override
public void accept(Integer t) {
action.accept(t);
}
}).sequential().mapToInt(ToIntFunction.UNBOX);
return new ParallelIteratorIntStream(stream, false, maxThreadNum, splitor, asyncExecutor, closeHandlers);
}
@Override
public void forEach(final Try.IntConsumer action) throws E {
assertNotClosed();
if (maxThreadNum <= 1) {
super.forEach(action);
return;
}
final List> futureList = new ArrayList<>(maxThreadNum);
final Holder eHolder = new Holder<>();
for (int i = 0; i < maxThreadNum; i++) {
futureList.add(asyncExecutor.execute(new Try.Runnable() {
@Override
public void run() {
int next = 0;
try {
while (eHolder.value() == null) {
synchronized (elements) {
if (elements.hasNext()) {
next = elements.nextInt();
} else {
break;
}
}
action.accept(next);
}
} catch (Exception e) {
setError(eHolder, e);
}
}
}));
}
try {
complette(futureList, eHolder, (E) null);
} finally {
close();
}
}
@Override
public > M toMap(final IntFunction keyMapper, final IntFunction valueMapper,
final BinaryOperator mergeFunction, final Supplier mapFactory) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.toMap(keyMapper, valueMapper, mergeFunction, mapFactory);
}
final Function keyMapper2 = new Function() {
@Override
public K apply(Integer value) {
return keyMapper.apply(value);
}
};
final Function valueMapper2 = new Function() {
@Override
public V apply(Integer value) {
return valueMapper.apply(value);
}
};
return boxed().toMap(keyMapper2, valueMapper2, mergeFunction, mapFactory);
}
@Override
public > M toMap(final IntFunction keyMapper, final Collector downstream,
final Supplier mapFactory) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.toMap(keyMapper, downstream, mapFactory);
}
final Function keyMapper2 = new Function() {
@Override
public K apply(Integer value) {
return keyMapper.apply(value);
}
};
return boxed().toMap(keyMapper2, downstream, mapFactory);
}
@Override
public int reduce(final int identity, final IntBinaryOperator op) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.reduce(identity, op);
}
final List> futureList = new ArrayList<>(maxThreadNum);
final Holder eHolder = new Holder<>();
for (int i = 0; i < maxThreadNum; i++) {
futureList.add(asyncExecutor.execute(new Callable() {
@Override
public Integer call() {
int result = identity;
int next = 0;
try {
while (eHolder.value() == null) {
synchronized (elements) {
if (elements.hasNext()) {
next = elements.nextInt();
} else {
break;
}
}
result = op.applyAsInt(result, next);
}
} catch (Exception e) {
setError(eHolder, e);
}
return result;
}
}));
}
if (eHolder.value() != null) {
close();
throw N.toRuntimeException(eHolder.value());
}
Integer result = null;
try {
for (ContinuableFuture future : futureList) {
if (result == null) {
result = future.get();
} else {
result = op.applyAsInt(result, future.get());
}
}
} catch (InterruptedException | ExecutionException e) {
throw N.toRuntimeException(e);
} finally {
close();
}
return result == null ? identity : result;
}
@Override
public OptionalInt reduce(final IntBinaryOperator accumulator) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.reduce(accumulator);
}
final List> futureList = new ArrayList<>(maxThreadNum);
final Holder eHolder = new Holder<>();
for (int i = 0; i < maxThreadNum; i++) {
futureList.add(asyncExecutor.execute(new Callable() {
@Override
public Integer call() {
int result = 0;
synchronized (elements) {
if (elements.hasNext()) {
result = elements.nextInt();
} else {
return null;
}
}
int next = 0;
try {
while (eHolder.value() == null) {
synchronized (elements) {
if (elements.hasNext()) {
next = elements.nextInt();
} else {
break;
}
}
result = accumulator.applyAsInt(result, next);
}
} catch (Exception e) {
setError(eHolder, e);
}
return result;
}
}));
}
if (eHolder.value() != null) {
close();
throw N.toRuntimeException(eHolder.value());
}
Integer result = null;
try {
for (ContinuableFuture future : futureList) {
final Integer tmp = future.get();
if (tmp == null) {
continue;
} else if (result == null) {
result = tmp;
} else {
result = accumulator.applyAsInt(result, tmp);
}
}
} catch (InterruptedException | ExecutionException e) {
throw N.toRuntimeException(e);
} finally {
close();
}
return result == null ? OptionalInt.empty() : OptionalInt.of(result);
}
@Override
public R collect(final Supplier supplier, final ObjIntConsumer accumulator, final BiConsumer combiner) {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.collect(supplier, accumulator, combiner);
}
final List> futureList = new ArrayList<>(maxThreadNum);
final Holder eHolder = new Holder<>();
for (int i = 0; i < maxThreadNum; i++) {
futureList.add(asyncExecutor.execute(new Callable() {
@Override
public R call() {
final R container = supplier.get();
int next = 0;
try {
while (eHolder.value() == null) {
synchronized (elements) {
if (elements.hasNext()) {
next = elements.nextInt();
} else {
break;
}
}
accumulator.accept(container, next);
}
} catch (Exception e) {
setError(eHolder, e);
}
return container;
}
}));
}
if (eHolder.value() != null) {
close();
throw N.toRuntimeException(eHolder.value());
}
R container = (R) NONE;
try {
for (ContinuableFuture future : futureList) {
if (container == NONE) {
container = future.get();
} else {
combiner.accept(container, future.get());
}
}
} catch (InterruptedException | ExecutionException e) {
throw N.toRuntimeException(e);
} finally {
close();
}
return container == NONE ? supplier.get() : container;
}
@Override
public boolean anyMatch(final Try.IntPredicate predicate) throws E {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.anyMatch(predicate);
}
final List> futureList = new ArrayList<>(maxThreadNum);
final Holder eHolder = new Holder<>();
final MutableBoolean result = MutableBoolean.of(false);
for (int i = 0; i < maxThreadNum; i++) {
futureList.add(asyncExecutor.execute(new Try.Runnable() {
@Override
public void run() {
int next = 0;
try {
while (result.isFalse() && eHolder.value() == null) {
synchronized (elements) {
if (elements.hasNext()) {
next = elements.nextInt();
} else {
break;
}
}
if (predicate.test(next)) {
result.setTrue();
break;
}
}
} catch (Exception e) {
setError(eHolder, e);
}
}
}));
}
try {
complette(futureList, eHolder, (E) null);
} finally {
close();
}
return result.value();
}
@Override
public boolean allMatch(final Try.IntPredicate predicate) throws E {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.allMatch(predicate);
}
final List> futureList = new ArrayList<>(maxThreadNum);
final Holder eHolder = new Holder<>();
final MutableBoolean result = MutableBoolean.of(true);
for (int i = 0; i < maxThreadNum; i++) {
futureList.add(asyncExecutor.execute(new Try.Runnable() {
@Override
public void run() {
int next = 0;
try {
while (result.isTrue() && eHolder.value() == null) {
synchronized (elements) {
if (elements.hasNext()) {
next = elements.nextInt();
} else {
break;
}
}
if (predicate.test(next) == false) {
result.setFalse();
break;
}
}
} catch (Exception e) {
setError(eHolder, e);
}
}
}));
}
try {
complette(futureList, eHolder, (E) null);
} finally {
close();
}
return result.value();
}
@Override
public boolean noneMatch(final Try.IntPredicate predicate) throws E {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.noneMatch(predicate);
}
final List> futureList = new ArrayList<>(maxThreadNum);
final Holder eHolder = new Holder<>();
final MutableBoolean result = MutableBoolean.of(true);
for (int i = 0; i < maxThreadNum; i++) {
futureList.add(asyncExecutor.execute(new Try.Runnable() {
@Override
public void run() {
int next = 0;
try {
while (result.isTrue() && eHolder.value() == null) {
synchronized (elements) {
if (elements.hasNext()) {
next = elements.nextInt();
} else {
break;
}
}
if (predicate.test(next)) {
result.setFalse();
break;
}
}
} catch (Exception e) {
setError(eHolder, e);
}
}
}));
}
try {
complette(futureList, eHolder, (E) null);
} finally {
close();
}
return result.value();
}
@Override
public OptionalInt findFirst(final Try.IntPredicate predicate) throws E {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.findFirst(predicate);
}
final List> futureList = new ArrayList<>(maxThreadNum);
final Holder eHolder = new Holder<>();
final Holder> resultHolder = new Holder<>();
final MutableLong index = MutableLong.of(0);
for (int i = 0; i < maxThreadNum; i++) {
futureList.add(asyncExecutor.execute(new Try.Runnable() {
@Override
public void run() {
final Pair pair = new Pair<>();
try {
while (resultHolder.value() == null && eHolder.value() == null) {
synchronized (elements) {
if (elements.hasNext()) {
pair.left = index.getAndIncrement();
pair.right = elements.nextInt();
} else {
break;
}
}
if (predicate.test(pair.right)) {
synchronized (resultHolder) {
if (resultHolder.value() == null || pair.left < resultHolder.value().left) {
resultHolder.setValue(pair.copy());
}
}
break;
}
}
} catch (Exception e) {
setError(eHolder, e);
}
}
}));
}
try {
complette(futureList, eHolder, (E) null);
} finally {
close();
}
return resultHolder.value() == null ? OptionalInt.empty() : OptionalInt.of(resultHolder.value().right);
}
@Override
public OptionalInt findLast(final Try.IntPredicate predicate) throws E {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.findLast(predicate);
}
final List> futureList = new ArrayList<>(maxThreadNum);
final Holder eHolder = new Holder<>();
final Holder> resultHolder = new Holder<>();
final MutableLong index = MutableLong.of(0);
for (int i = 0; i < maxThreadNum; i++) {
futureList.add(asyncExecutor.execute(new Try.Runnable() {
@Override
public void run() {
final Pair pair = new Pair<>();
try {
while (eHolder.value() == null) {
synchronized (elements) {
if (elements.hasNext()) {
pair.left = index.getAndIncrement();
pair.right = elements.nextInt();
} else {
break;
}
}
if (predicate.test(pair.right)) {
synchronized (resultHolder) {
if (resultHolder.value() == null || pair.left > resultHolder.value().left) {
resultHolder.setValue(pair.copy());
}
}
}
}
} catch (Exception e) {
setError(eHolder, e);
}
}
}));
}
try {
complette(futureList, eHolder, (E) null);
} finally {
close();
}
return resultHolder.value() == null ? OptionalInt.empty() : OptionalInt.of(resultHolder.value().right);
}
@Override
public OptionalInt findAny(final Try.IntPredicate predicate) throws E {
assertNotClosed();
if (maxThreadNum <= 1) {
return super.findAny(predicate);
}
final List> futureList = new ArrayList<>(maxThreadNum);
final Holder eHolder = new Holder<>();
final Holder