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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC
/*
* 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.rxjava3.internal.operators.flowable;
import java.util.*;
import java.util.concurrent.Semaphore;
import java.util.concurrent.atomic.AtomicReference;
import org.reactivestreams.Publisher;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.internal.util.*;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
import io.reactivex.rxjava3.subscribers.DisposableSubscriber;
/**
* Wait for and iterate over the latest values of the source observable. If the source works faster than the
* iterator, values may be skipped, but not the {@code onError} or {@code onComplete} events.
* @param the value type emitted
*/
public final class BlockingFlowableLatest implements Iterable {
final Publisher extends T> source;
public BlockingFlowableLatest(Publisher extends T> source) {
this.source = source;
}
@Override
public Iterator iterator() {
LatestSubscriberIterator lio = new LatestSubscriberIterator<>();
Flowable.fromPublisher(source).materialize().subscribe(lio);
return lio;
}
/** Subscriber of source, iterator for output. */
static final class LatestSubscriberIterator extends DisposableSubscriber> implements Iterator {
final Semaphore notify = new Semaphore(0);
// observer's notification
final AtomicReference> value = new AtomicReference<>();
// iterator's notification
Notification iteratorNotification;
@Override
public void onNext(Notification args) {
boolean wasNotAvailable = value.getAndSet(args) == null;
if (wasNotAvailable) {
notify.release();
}
}
@Override
public void onError(Throwable e) {
RxJavaPlugins.onError(e);
}
@Override
public void onComplete() {
// not expected
}
@Override
public boolean hasNext() {
if (iteratorNotification != null && iteratorNotification.isOnError()) {
throw ExceptionHelper.wrapOrThrow(iteratorNotification.getError());
}
if (iteratorNotification == null || iteratorNotification.isOnNext()) {
if (iteratorNotification == null) {
try {
BlockingHelper.verifyNonBlocking();
notify.acquire();
} catch (InterruptedException ex) {
dispose();
iteratorNotification = Notification.createOnError(ex);
throw ExceptionHelper.wrapOrThrow(ex);
}
Notification n = value.getAndSet(null);
iteratorNotification = n;
if (n.isOnError()) {
throw ExceptionHelper.wrapOrThrow(n.getError());
}
}
}
return iteratorNotification.isOnNext();
}
@Override
public T next() {
if (hasNext()) {
if (iteratorNotification.isOnNext()) {
T v = iteratorNotification.getValue();
iteratorNotification = null;
return v;
}
}
throw new NoSuchElementException();
}
@Override
public void remove() {
throw new UnsupportedOperationException("Read-only iterator.");
}
}
}
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