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A general programming library in Java
/*
* Copyright (C) 2016 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.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Comparator;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.atomic.AtomicLong;
import com.landawn.abacus.util.ByteIterator;
import com.landawn.abacus.util.CharIterator;
import com.landawn.abacus.util.CompletableFuture;
import com.landawn.abacus.util.DoubleIterator;
import com.landawn.abacus.util.FloatIterator;
import com.landawn.abacus.util.Holder;
import com.landawn.abacus.util.Indexed;
import com.landawn.abacus.util.IntIterator;
import com.landawn.abacus.util.LongIterator;
import com.landawn.abacus.util.LongMultiset;
import com.landawn.abacus.util.Multimap;
import com.landawn.abacus.util.Multiset;
import com.landawn.abacus.util.MutableBoolean;
import com.landawn.abacus.util.MutableInt;
import com.landawn.abacus.util.N;
import com.landawn.abacus.util.Nth;
import com.landawn.abacus.util.NullabLe;
import com.landawn.abacus.util.Pair;
import com.landawn.abacus.util.ShortIterator;
import com.landawn.abacus.util.Try;
import com.landawn.abacus.util.function.BiConsumer;
import com.landawn.abacus.util.function.BiFunction;
import com.landawn.abacus.util.function.BiPredicate;
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.IntFunction;
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;
import com.landawn.abacus.util.function.TriConsumer;
import com.landawn.abacus.util.function.TriFunction;
/**
* This class is a sequential, stateful and immutable stream implementation.
*
* @param
* @since 0.8
*
* @author Haiyang Li
*/
final class ParallelArrayStream extends ArrayStream {
private final int maxThreadNum;
private final Splitor splitor;
private volatile ArrayStream sequential;
ParallelArrayStream(final T[] values, final int fromIndex, final int toIndex, final Collection closeHandlers, final boolean sorted,
Comparator comparator, int maxThreadNum, Splitor splitor) {
super(values, fromIndex, toIndex, closeHandlers, sorted, comparator);
this.maxThreadNum = fromIndex >= toIndex ? 1 : N.min(maxThreadNum, MAX_THREAD_NUM_PER_OPERATION, toIndex - fromIndex);
this.splitor = splitor == null ? DEFAULT_SPLITOR : splitor;
}
@Override
public Stream filter(final Predicate predicate) {
if (maxThreadNum <= 1) {
return new ParallelIteratorStream<>(sequential().filter(predicate).iterator(), closeHandlers, sorted, cmp, maxThreadNum, splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
private T next = null;
private boolean hasNext = false;
@Override
public boolean hasNext() {
if (hasNext == false) {
while (cursor < to) {
next = elements[cursor++];
if (predicate.test(next)) {
hasNext = true;
break;
}
}
}
return hasNext;
}
@Override
public T next() {
if (hasNext == false && hasNext() == false) {
throw new NoSuchElementException();
}
hasNext = false;
return next;
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private T next = null;
private boolean hasNext = false;
@Override
public boolean hasNext() {
if (hasNext == false) {
while (true) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
} else {
break;
}
}
if (predicate.test(next)) {
hasNext = true;
break;
}
}
}
return hasNext;
}
@Override
public T next() {
if (hasNext == false && hasNext() == false) {
throw new NoSuchElementException();
}
hasNext = false;
return next;
}
});
}
}
return new ParallelIteratorStream<>(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, null, maxThreadNum, splitor);
}
@Override
public Stream takeWhile(final Predicate predicate) {
if (maxThreadNum <= 1) {
return new ParallelIteratorStream<>(sequential().takeWhile(predicate).iterator(), closeHandlers, sorted, cmp, maxThreadNum, splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
final MutableBoolean hasMore = MutableBoolean.of(true);
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private T next = null;
private boolean hasNext = false;
@Override
public boolean hasNext() {
if (hasNext == false && hasMore.isTrue()) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
hasNext = true;
} else {
hasMore.setFalse();
}
}
if (hasNext && predicate.test(next) == false) {
hasNext = false;
hasMore.setFalse();
}
}
return hasNext;
}
@Override
public T next() {
if (hasNext == false && hasNext() == false) {
throw new NoSuchElementException();
}
hasNext = false;
return next;
}
});
}
return new ParallelIteratorStream<>(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, null, maxThreadNum, splitor);
}
@Override
public Stream dropWhile(final Predicate predicate) {
if (maxThreadNum <= 1) {
return new ParallelIteratorStream<>(sequential().dropWhile(predicate).iterator(), closeHandlers, sorted, cmp, maxThreadNum, splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
final MutableBoolean dropped = MutableBoolean.of(false);
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private T next = null;
private boolean hasNext = false;
@Override
public boolean hasNext() {
if (hasNext == false) {
// Only one thread is kept for running after it's dropped.
if (dropped.isTrue()) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
hasNext = true;
}
}
} else {
while (dropped.isFalse()) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
} else {
break;
}
}
if (predicate.test(next) == false) {
hasNext = true;
dropped.setTrue();
break;
}
}
if (hasNext == false && dropped.isTrue()) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
hasNext = true;
}
}
}
}
}
return hasNext;
}
@Override
public T next() {
if (hasNext == false && hasNext() == false) {
throw new NoSuchElementException();
}
hasNext = false;
return next;
}
});
}
return new ParallelIteratorStream<>(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, null, maxThreadNum, splitor);
}
@Override
public Stream map(final Function mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorStream<>(sequential().map(mapper).iterator(), closeHandlers, false, null, maxThreadNum, splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
@Override
public boolean hasNext() {
return cursor < to;
}
@Override
public R next() {
if (cursor >= to) {
throw new NoSuchElementException();
}
return mapper.apply(elements[cursor++]);
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private Object next = NONE;
@Override
public boolean hasNext() {
if (next == NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
}
}
}
return next != NONE;
}
@Override
public R next() {
if (next == NONE && hasNext() == false) {
throw new NoSuchElementException();
}
R result = mapper.apply((T) next);
next = NONE;
return result;
}
});
}
}
return new ParallelIteratorStream<>(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, null, maxThreadNum, splitor);
}
@Override
public Stream biMap(final BiFunction mapper, final boolean ignoreNotPaired) {
if (maxThreadNum <= 1) {
return new ParallelIteratorStream<>(sequential().biMap(mapper, ignoreNotPaired).iterator(), closeHandlers, false, null, maxThreadNum, splitor);
}
final int atLeast = ignoreNotPaired ? 2 : 1;
final int count = (toIndex - fromIndex) / 2 + (ignoreNotPaired || (toIndex - fromIndex) % 2 == 0 ? 0 : 1);
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = count / maxThreadNum + (count % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize * 2;
private final int to = toIndex - cursor > sliceSize * 2 ? cursor + sliceSize * 2 : toIndex;
@Override
public boolean hasNext() {
return to - cursor >= atLeast;
}
@Override
public R next() {
if (to - cursor < atLeast) {
throw new NoSuchElementException();
}
return mapper.apply(elements[cursor++], cursor == toIndex ? null : elements[cursor++]);
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private Object pre = NONE;
private Object next = NONE;
@Override
public boolean hasNext() {
if (pre == NONE) {
synchronized (elements) {
if (toIndex - cursor.intValue() >= atLeast) {
pre = elements[cursor.getAndIncrement()];
next = cursor.intValue() == toIndex ? null : elements[cursor.getAndIncrement()];
}
}
}
return pre != NONE;
}
@Override
public R next() {
if (pre == NONE && hasNext() == false) {
throw new NoSuchElementException();
}
final R result = mapper.apply((T) pre, (T) next);
pre = NONE;
next = NONE;
return result;
}
});
}
}
return new ParallelIteratorStream<>(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, null, maxThreadNum, splitor);
}
@Override
public Stream triMap(final TriFunction mapper, final boolean ignoreNotPaired) {
if (maxThreadNum <= 1) {
return new ParallelIteratorStream<>(sequential().triMap(mapper, ignoreNotPaired).iterator(), closeHandlers, false, null, maxThreadNum, splitor);
}
final int atLeast = ignoreNotPaired ? 3 : 1;
final int count = (toIndex - fromIndex) / 3 + (ignoreNotPaired || (toIndex - fromIndex) % 3 == 0 ? 0 : 1);
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = count / maxThreadNum + (count % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize * 3;
private final int to = toIndex - cursor > sliceSize * 3 ? cursor + sliceSize * 3 : toIndex;
@Override
public boolean hasNext() {
return to - cursor >= atLeast;
}
@Override
public R next() {
if (to - cursor < atLeast) {
throw new NoSuchElementException();
}
return mapper.apply(elements[cursor++], cursor == toIndex ? null : elements[cursor++], cursor == toIndex ? null : elements[cursor++]);
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private Object prepre = NONE;
private Object pre = NONE;
private Object next = NONE;
@Override
public boolean hasNext() {
if (prepre == NONE) {
synchronized (elements) {
if (toIndex - cursor.intValue() >= atLeast) {
prepre = elements[cursor.getAndIncrement()];
pre = cursor.intValue() == toIndex ? null : elements[cursor.getAndIncrement()];
next = cursor.intValue() == toIndex ? null : elements[cursor.getAndIncrement()];
}
}
}
return prepre != NONE;
}
@Override
public R next() {
if (prepre == NONE && hasNext() == false) {
throw new NoSuchElementException();
}
final R result = mapper.apply((T) prepre, (T) pre, (T) next);
prepre = NONE;
pre = NONE;
next = NONE;
return result;
}
});
}
}
return new ParallelIteratorStream<>(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, null, maxThreadNum, splitor);
}
@SuppressWarnings("resource")
@Override
public Stream mapFirst(final Function mapperForFirst) {
N.requireNonNull(mapperForFirst);
if (maxThreadNum <= 1) {
return new ParallelIteratorStream<>(sequential().mapFirst(mapperForFirst).iterator(), closeHandlers, false, null, maxThreadNum, splitor);
}
if (fromIndex == toIndex) {
return this;
} else if (toIndex - fromIndex == 1) {
return map(mapperForFirst);
} else {
return new ParallelArrayStream<>(elements, fromIndex + 1, toIndex, closeHandlers, sorted, cmp, maxThreadNum, splitor)
.prepend(new ArrayStream<>(elements, fromIndex, fromIndex + 1).map(mapperForFirst));
}
}
@SuppressWarnings("resource")
@Override
public Stream mapFirstOrElse(final Function mapperForFirst, final Function mapperForElse) {
N.requireNonNull(mapperForFirst);
N.requireNonNull(mapperForElse);
if (maxThreadNum <= 1) {
return new ParallelIteratorStream<>(sequential().mapFirstOrElse(mapperForFirst, mapperForElse).iterator(), closeHandlers, false, null, maxThreadNum,
splitor);
}
if (fromIndex == toIndex) {
return (Stream) this;
} else if (toIndex - fromIndex == 1) {
return map(mapperForFirst);
} else {
final Function mapperForFirst2 = (Function) mapperForFirst;
final Function mapperForElse2 = (Function) mapperForElse;
return new ParallelArrayStream<>(elements, fromIndex + 1, toIndex, closeHandlers, sorted, cmp, maxThreadNum, splitor).map(mapperForElse2)
.prepend(new ArrayStream<>(elements, fromIndex, fromIndex + 1).map(mapperForFirst2));
}
}
@SuppressWarnings("resource")
@Override
public Stream mapLast(final Function mapperForLast) {
N.requireNonNull(mapperForLast);
if (maxThreadNum <= 1) {
return new ParallelIteratorStream<>(sequential().mapLast(mapperForLast).iterator(), closeHandlers, false, null, maxThreadNum, splitor);
}
if (fromIndex == toIndex) {
return this;
} else if (toIndex - fromIndex == 1) {
return map(mapperForLast);
} else {
return new ParallelArrayStream<>(elements, fromIndex, toIndex - 1, closeHandlers, sorted, cmp, maxThreadNum, splitor)
.append(new ArrayStream<>(elements, toIndex - 1, toIndex).map(mapperForLast));
}
}
@SuppressWarnings("resource")
@Override
public Stream mapLastOrElse(final Function mapperForLast, final Function mapperForElse) {
N.requireNonNull(mapperForLast);
N.requireNonNull(mapperForElse);
if (maxThreadNum <= 1) {
return new ParallelIteratorStream<>(sequential().mapLastOrElse(mapperForLast, mapperForElse).iterator(), closeHandlers, false, null, maxThreadNum,
splitor);
}
if (fromIndex == toIndex) {
return (Stream) this;
} else if (toIndex - fromIndex == 1) {
return map(mapperForLast);
} else {
final Function mapperForLast2 = (Function) mapperForLast;
final Function mapperForElse2 = (Function) mapperForElse;
return new ParallelArrayStream<>(elements, fromIndex, toIndex - 1, closeHandlers, sorted, cmp, maxThreadNum, splitor).map(mapperForElse2)
.append(new ArrayStream<>(elements, toIndex - 1, toIndex).map(mapperForLast2));
}
}
@Override
public CharStream mapToChar(final ToCharFunction mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorCharStream(sequential().mapToChar(mapper).exIterator(), closeHandlers, false, maxThreadNum, splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
@Override
public boolean hasNext() {
return cursor < to;
}
@Override
public Character next() {
if (cursor >= to) {
throw new NoSuchElementException();
}
return mapper.applyAsChar(elements[cursor++]);
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private Object next = NONE;
@Override
public boolean hasNext() {
if (next == NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
}
}
}
return next != NONE;
}
@Override
public Character next() {
if (next == NONE && hasNext() == false) {
throw new NoSuchElementException();
}
Character result = mapper.applyAsChar((T) next);
next = NONE;
return result;
}
});
}
}
return new ParallelIteratorCharStream(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, maxThreadNum, splitor);
}
@Override
public ByteStream mapToByte(final ToByteFunction mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorByteStream(sequential().mapToByte(mapper).exIterator(), closeHandlers, false, maxThreadNum, splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
@Override
public boolean hasNext() {
return cursor < to;
}
@Override
public Byte next() {
if (cursor >= to) {
throw new NoSuchElementException();
}
return mapper.applyAsByte(elements[cursor++]);
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private Object next = NONE;
@Override
public boolean hasNext() {
if (next == NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
}
}
}
return next != NONE;
}
@Override
public Byte next() {
if (next == NONE && hasNext() == false) {
throw new NoSuchElementException();
}
Byte result = mapper.applyAsByte((T) next);
next = NONE;
return result;
}
});
}
}
return new ParallelIteratorByteStream(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, maxThreadNum, splitor);
}
@Override
public ShortStream mapToShort(final ToShortFunction mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorShortStream(sequential().mapToShort(mapper).exIterator(), closeHandlers, false, maxThreadNum, splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
@Override
public boolean hasNext() {
return cursor < to;
}
@Override
public Short next() {
if (cursor >= to) {
throw new NoSuchElementException();
}
return mapper.applyAsShort(elements[cursor++]);
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private Object next = NONE;
@Override
public boolean hasNext() {
if (next == NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
}
}
}
return next != NONE;
}
@Override
public Short next() {
if (next == NONE && hasNext() == false) {
throw new NoSuchElementException();
}
Short result = mapper.applyAsShort((T) next);
next = NONE;
return result;
}
});
}
}
return new ParallelIteratorShortStream(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, maxThreadNum, splitor);
}
@Override
public IntStream mapToInt(final ToIntFunction mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorIntStream(sequential().mapToInt(mapper).exIterator(), closeHandlers, false, maxThreadNum, splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
@Override
public boolean hasNext() {
return cursor < to;
}
@Override
public Integer next() {
if (cursor >= to) {
throw new NoSuchElementException();
}
return mapper.applyAsInt(elements[cursor++]);
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private Object next = NONE;
@Override
public boolean hasNext() {
if (next == NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
}
}
}
return next != NONE;
}
@Override
public Integer next() {
if (next == NONE && hasNext() == false) {
throw new NoSuchElementException();
}
Integer result = mapper.applyAsInt((T) next);
next = NONE;
return result;
}
});
}
}
return new ParallelIteratorIntStream(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, maxThreadNum, splitor);
}
@Override
public LongStream mapToLong(final ToLongFunction mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorLongStream(sequential().mapToLong(mapper).exIterator(), closeHandlers, false, maxThreadNum, splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
@Override
public boolean hasNext() {
return cursor < to;
}
@Override
public Long next() {
if (cursor >= to) {
throw new NoSuchElementException();
}
return mapper.applyAsLong(elements[cursor++]);
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private Object next = NONE;
@Override
public boolean hasNext() {
if (next == NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
}
}
}
return next != NONE;
}
@Override
public Long next() {
if (next == NONE && hasNext() == false) {
throw new NoSuchElementException();
}
Long result = mapper.applyAsLong((T) next);
next = NONE;
return result;
}
});
}
}
return new ParallelIteratorLongStream(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, maxThreadNum, splitor);
}
@Override
public FloatStream mapToFloat(final ToFloatFunction mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorFloatStream(sequential().mapToFloat(mapper).exIterator(), closeHandlers, false, maxThreadNum, splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
@Override
public boolean hasNext() {
return cursor < to;
}
@Override
public Float next() {
if (cursor >= to) {
throw new NoSuchElementException();
}
return mapper.applyAsFloat(elements[cursor++]);
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private Object next = NONE;
@Override
public boolean hasNext() {
if (next == NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
}
}
}
return next != NONE;
}
@Override
public Float next() {
if (next == NONE && hasNext() == false) {
throw new NoSuchElementException();
}
Float result = mapper.applyAsFloat((T) next);
next = NONE;
return result;
}
});
}
}
return new ParallelIteratorFloatStream(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, maxThreadNum, splitor);
}
@Override
public DoubleStream mapToDouble(final ToDoubleFunction mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorDoubleStream(sequential().mapToDouble(mapper).exIterator(), closeHandlers, false, maxThreadNum, splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
@Override
public boolean hasNext() {
return cursor < to;
}
@Override
public Double next() {
if (cursor >= to) {
throw new NoSuchElementException();
}
return mapper.applyAsDouble(elements[cursor++]);
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private Object next = NONE;
@Override
public boolean hasNext() {
if (next == NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
}
}
}
return next != NONE;
}
@Override
public Double next() {
if (next == NONE && hasNext() == false) {
throw new NoSuchElementException();
}
Double result = mapper.applyAsDouble((T) next);
next = NONE;
return result;
}
});
}
}
return new ParallelIteratorDoubleStream(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, maxThreadNum, splitor);
}
@Override
Stream flatMap0(final Function> mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorStream<>(((ArrayStream) sequential()).flatMap0(mapper).iterator(), closeHandlers, false, null, maxThreadNum, splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
private Iterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < to) {
cur = mapper.apply(elements[cursor++]);
}
return cur != null && cur.hasNext();
}
@Override
public R next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.next();
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private T next = null;
private Iterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && next != NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
} else {
next = (T) NONE;
break;
}
}
cur = mapper.apply(next);
}
return cur != null && cur.hasNext();
}
@Override
public R next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.next();
}
});
}
}
return new ParallelIteratorStream<>(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, null, maxThreadNum, splitor);
}
@Override
CharStream flatMapToChar0(final Function mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorCharStream(((ArrayStream) sequential()).flatMapToChar0(mapper).exIterator(), closeHandlers, false, maxThreadNum,
splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
private CharIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < to) {
cur = mapper.apply(elements[cursor++]);
}
return cur != null && cur.hasNext();
}
@Override
public Character next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextChar();
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private T next = null;
private CharIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && next != NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
} else {
next = (T) NONE;
break;
}
}
cur = mapper.apply(next);
}
return cur != null && cur.hasNext();
}
@Override
public Character next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextChar();
}
});
}
}
return new ParallelIteratorCharStream(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, maxThreadNum, splitor);
}
@Override
ByteStream flatMapToByte0(final Function mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorByteStream(((ArrayStream) sequential()).flatMapToByte0(mapper).exIterator(), closeHandlers, false, maxThreadNum,
splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
private ByteIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < to) {
cur = mapper.apply(elements[cursor++]);
}
return cur != null && cur.hasNext();
}
@Override
public Byte next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextByte();
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private T next = null;
private ByteIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && next != NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
} else {
next = (T) NONE;
break;
}
}
cur = mapper.apply(next);
}
return cur != null && cur.hasNext();
}
@Override
public Byte next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextByte();
}
});
}
}
return new ParallelIteratorByteStream(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, maxThreadNum, splitor);
}
@Override
ShortStream flatMapToShort0(final Function mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorShortStream(((ArrayStream) sequential()).flatMapToShort0(mapper).exIterator(), closeHandlers, false, maxThreadNum,
splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
private ShortIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < to) {
cur = mapper.apply(elements[cursor++]);
}
return cur != null && cur.hasNext();
}
@Override
public Short next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextShort();
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private T next = null;
private ShortIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && next != NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
} else {
next = (T) NONE;
break;
}
}
cur = mapper.apply(next);
}
return cur != null && cur.hasNext();
}
@Override
public Short next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextShort();
}
});
}
}
return new ParallelIteratorShortStream(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, maxThreadNum, splitor);
}
@Override
IntStream flatMapToInt0(final Function mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorIntStream(((ArrayStream) sequential()).flatMapToInt0(mapper).exIterator(), closeHandlers, false, maxThreadNum,
splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
private IntIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < to) {
cur = mapper.apply(elements[cursor++]);
}
return cur != null && cur.hasNext();
}
@Override
public Integer next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextInt();
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private T next = null;
private IntIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && next != NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
} else {
next = (T) NONE;
break;
}
}
cur = mapper.apply(next);
}
return cur != null && cur.hasNext();
}
@Override
public Integer next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextInt();
}
});
}
}
return new ParallelIteratorIntStream(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, maxThreadNum, splitor);
}
@Override
LongStream flatMapToLong0(final Function mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorLongStream(((ArrayStream) sequential()).flatMapToLong0(mapper).exIterator(), closeHandlers, false, maxThreadNum,
splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
private LongIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < to) {
cur = mapper.apply(elements[cursor++]);
}
return cur != null && cur.hasNext();
}
@Override
public Long next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextLong();
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private T next = null;
private LongIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && next != NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
} else {
next = (T) NONE;
break;
}
}
cur = mapper.apply(next);
}
return cur != null && cur.hasNext();
}
@Override
public Long next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextLong();
}
});
}
}
return new ParallelIteratorLongStream(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, maxThreadNum, splitor);
}
@Override
FloatStream flatMapToFloat0(final Function mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorFloatStream(((ArrayStream) sequential()).flatMapToFloat0(mapper).exIterator(), closeHandlers, false, maxThreadNum,
splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
private FloatIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < to) {
cur = mapper.apply(elements[cursor++]);
}
return cur != null && cur.hasNext();
}
@Override
public Float next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextFloat();
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private T next = null;
private FloatIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && next != NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
} else {
next = (T) NONE;
break;
}
}
cur = mapper.apply(next);
}
return cur != null && cur.hasNext();
}
@Override
public Float next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextFloat();
}
});
}
}
return new ParallelIteratorFloatStream(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, maxThreadNum, splitor);
}
@Override
DoubleStream flatMapToDouble0(final Function mapper) {
if (maxThreadNum <= 1) {
return new ParallelIteratorDoubleStream(((ArrayStream) sequential()).flatMapToDouble0(mapper).exIterator(), closeHandlers, false, maxThreadNum,
splitor);
}
final List> iters = new ArrayList<>(maxThreadNum);
if (splitor == Splitor.ARRAY) {
final int sliceSize = (toIndex - fromIndex) / maxThreadNum + ((toIndex - fromIndex) % maxThreadNum == 0 ? 0 : 1);
for (int i = 0; i < maxThreadNum; i++) {
final int sliceIndex = i;
iters.add(new ExIterator() {
private int cursor = fromIndex + sliceIndex * sliceSize;
private final int to = toIndex - cursor > sliceSize ? cursor + sliceSize : toIndex;
private DoubleIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < to) {
cur = mapper.apply(elements[cursor++]);
}
return cur != null && cur.hasNext();
}
@Override
public Double next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextDouble();
}
});
}
} else {
final MutableInt cursor = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private T next = null;
private DoubleIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && next != NONE) {
synchronized (elements) {
if (cursor.intValue() < toIndex) {
next = elements[cursor.getAndIncrement()];
} else {
next = (T) NONE;
break;
}
}
cur = mapper.apply(next);
}
return cur != null && cur.hasNext();
}
@Override
public Double next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextDouble();
}
});
}
}
return new ParallelIteratorDoubleStream(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, maxThreadNum, splitor);
}
@Override
public Stream slidingMap(final BiFunction mapper, final int increment) {
if (maxThreadNum <= 1) {
return new ParallelIteratorStream<>(sequential().slidingMap(mapper, increment).iterator(), closeHandlers, false, null, maxThreadNum, splitor);
}
final int windowSize = 2;
N.checkArgument(windowSize > 0 && increment > 0, "'windowSize'=%s and 'increment'=%s must not be less than 1", windowSize, increment);
final List> iters = new ArrayList<>(maxThreadNum);
final MutableInt curIndex = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private int cursor = -1;
@Override
public boolean hasNext() {
if (cursor == -1) {
synchronized (elements) {
if (curIndex.intValue() < toIndex) {
cursor = curIndex.value();
curIndex.setValue(increment < toIndex - cursor && windowSize < toIndex - cursor ? cursor + increment : toIndex);
}
}
}
return cursor != -1;
}
@Override
public R next() {
if (cursor == -1 && hasNext() == false) {
throw new NoSuchElementException();
}
final R result = mapper.apply(elements[cursor], cursor < toIndex - 1 ? elements[cursor + 1] : null);
cursor = -1;
return result;
}
});
}
return new ParallelIteratorStream<>(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, null, maxThreadNum, splitor);
}
@Override
public Stream slidingMap(final TriFunction mapper, final int increment) {
if (maxThreadNum <= 1) {
return new ParallelIteratorStream<>(sequential().slidingMap(mapper, increment).iterator(), closeHandlers, false, null, maxThreadNum, splitor);
}
final int windowSize = 3;
N.checkArgument(windowSize > 0 && increment > 0, "'windowSize'=%s and 'increment'=%s must not be less than 1", windowSize, increment);
final List> iters = new ArrayList<>(maxThreadNum);
final MutableInt curIndex = MutableInt.of(fromIndex);
for (int i = 0; i < maxThreadNum; i++) {
iters.add(new ExIterator() {
private int cursor = -1;
@Override
public boolean hasNext() {
if (cursor == -1) {
synchronized (elements) {
if (curIndex.intValue() < toIndex) {
cursor = curIndex.value();
curIndex.setValue(increment < toIndex - cursor && windowSize < toIndex - cursor ? cursor + increment : toIndex);
}
}
}
return cursor != -1;
}
@Override
public R next() {
if (cursor == -1 && hasNext() == false) {
throw new NoSuchElementException();
}
final R result = mapper.apply(elements[cursor], cursor < toIndex - 1 ? elements[cursor + 1] : null,
cursor < toIndex - 2 ? elements[cursor + 2] : null);
cursor = -1;
return result;
}
});
}
return new ParallelIteratorStream<>(Stream.parallelConcat(iters, asyncExecutor), closeHandlers, false, null, maxThreadNum, splitor);
}
@Override
public Stream> split(final int size) {
return new ParallelIteratorStream<>(sequential().split(size).iterator(), closeHandlers, false, null, maxThreadNum, splitor);
}
@Override
public Stream> splitToList(final int size) {
return new ParallelIteratorStream<>(sequential().splitToList(size).iterator(), closeHandlers, false, null, maxThreadNum, splitor);
}
@Override
public Stream> splitToSet(final int size) {
return new ParallelIteratorStream<>(sequential().splitToSet(size).iterator(), closeHandlers, false, null, maxThreadNum, splitor);
}
@Override
public Stream> split(final U identity, final BiFunction predicate, final Consumer identityUpdate) {
return new ParallelIteratorStream<>(sequential().split(identity, predicate, identityUpdate).iterator(), closeHandlers, false, null, maxThreadNum,
splitor);
}
@Override
public Stream> splitToList(final U identity, final BiFunction predicate,
final Consumer identityUpdate) {
return new ParallelIteratorStream<>(sequential().splitToList(identity, predicate, identityUpdate).iterator(), closeHandlers, false, null, maxThreadNum,
splitor);
}
@Override
public Stream> splitToSet(final U identity, final BiFunction predicate,
final Consumer identityUpdate) {
return new ParallelIteratorStream<>(sequential().splitToSet(identity, predicate, identityUpdate).iterator(), closeHandlers, false, null, maxThreadNum,
splitor);
}
@Override
public Stream> splitAt(final int n) {
if (n < 0) {
throw new IllegalArgumentException("'n' can't be negative");
}
final Stream[] a = new Stream[2];
final int middleIndex = n < toIndex - fromIndex ? fromIndex + n : toIndex;
a[0] = middleIndex == fromIndex ? (Stream) Stream.empty() : new ArrayStream<>(elements, fromIndex, middleIndex, null, sorted, cmp);
a[1] = middleIndex == toIndex ? (Stream) Stream.empty() : new ArrayStream<>(elements, middleIndex, toIndex, null, sorted, cmp);
return new ParallelArrayStream<>(a, 0, a.length, closeHandlers, false, null, maxThreadNum, splitor);
}
@Override
public Stream> splitBy(final Predicate where) {
N.requireNonNull(where);
final NullabLe> first = indexed().findFirst(new Predicate>() {
@Override
public boolean test(Indexed indexed) {
return !where.test(indexed.value());
}
});
return splitAt(first.isPresent() ? (int) first.get().index() : toIndex - fromIndex);
}
@Override
public Stream> sliding(final int windowSize, final int increment) {
return new ParallelIteratorStream<>(sequential().sliding(windowSize, increment).iterator(), closeHandlers, false, null, maxThreadNum, splitor);
}
@Override
public Stream> slidingToList(final int windowSize, final int increment) {
return new ParallelIteratorStream<>(sequential().slidingToList(windowSize, increment).iterator(), closeHandlers, false, null, maxThreadNum, splitor);
}
@Override
public Stream distinctBy(final Function keyExtractor) {
final Set