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Reactive Extensions for Java
/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* 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 io.reactivex.internal.operators.observable;
import java.util.*;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.locks.*;
import io.reactivex.ObservableSource;
import io.reactivex.disposables.Disposable;
import io.reactivex.internal.disposables.DisposableHelper;
import io.reactivex.internal.queue.SpscLinkedArrayQueue;
import io.reactivex.internal.util.*;
public final class BlockingObservableIterable implements Iterable {
final ObservableSource extends T> source;
final int bufferSize;
public BlockingObservableIterable(ObservableSource extends T> source, int bufferSize) {
this.source = source;
this.bufferSize = bufferSize;
}
@Override
public Iterator iterator() {
BlockingObservableIterator it = new BlockingObservableIterator(bufferSize);
source.subscribe(it);
return it;
}
static final class BlockingObservableIterator
extends AtomicReference
implements io.reactivex.Observer, Iterator, Disposable {
private static final long serialVersionUID = 6695226475494099826L;
final SpscLinkedArrayQueue queue;
final Lock lock;
final Condition condition;
volatile boolean done;
Throwable error;
BlockingObservableIterator(int batchSize) {
this.queue = new SpscLinkedArrayQueue(batchSize);
this.lock = new ReentrantLock();
this.condition = lock.newCondition();
}
@Override
public boolean hasNext() {
for (;;) {
boolean d = done;
boolean empty = queue.isEmpty();
if (d) {
Throwable e = error;
if (e != null) {
throw ExceptionHelper.wrapOrThrow(e);
} else
if (empty) {
return false;
}
}
if (empty) {
try {
BlockingHelper.verifyNonBlocking();
lock.lock();
try {
while (!done && queue.isEmpty()) {
condition.await();
}
} finally {
lock.unlock();
}
} catch (InterruptedException ex) {
DisposableHelper.dispose(this);
signalConsumer();
throw ExceptionHelper.wrapOrThrow(ex);
}
} else {
return true;
}
}
}
@Override
public T next() {
if (hasNext()) {
return queue.poll();
}
throw new NoSuchElementException();
}
@Override
public void onSubscribe(Disposable d) {
DisposableHelper.setOnce(this, d);
}
@Override
public void onNext(T t) {
queue.offer(t);
signalConsumer();
}
@Override
public void onError(Throwable t) {
error = t;
done = true;
signalConsumer();
}
@Override
public void onComplete() {
done = true;
signalConsumer();
}
void signalConsumer() {
lock.lock();
try {
condition.signalAll();
} finally {
lock.unlock();
}
}
@Override // otherwise default method which isn't available in Java 7
public void remove() {
throw new UnsupportedOperationException("remove");
}
@Override
public void dispose() {
DisposableHelper.dispose(this);
}
@Override
public boolean isDisposed() {
return DisposableHelper.isDisposed(get());
}
}
}
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