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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.subscribers;
import java.util.concurrent.CountDownLatch;
import org.reactivestreams.Subscription;
import io.reactivex.rxjava3.core.FlowableSubscriber;
import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
import io.reactivex.rxjava3.internal.util.*;
public abstract class BlockingBaseSubscriber extends CountDownLatch
implements FlowableSubscriber {
T value;
Throwable error;
Subscription upstream;
volatile boolean cancelled;
public BlockingBaseSubscriber() {
super(1);
}
@Override
public final void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
this.upstream = s;
if (!cancelled) {
s.request(Long.MAX_VALUE);
if (cancelled) {
this.upstream = SubscriptionHelper.CANCELLED;
s.cancel();
}
}
}
}
@Override
public final void onComplete() {
countDown();
}
/**
* Block until the first value arrives and return it, otherwise
* return null for an empty source and rethrow any exception.
* @return the first value or null if the source is empty
*/
public final T blockingGet() {
if (getCount() != 0) {
try {
BlockingHelper.verifyNonBlocking();
await();
} catch (InterruptedException ex) {
Subscription s = this.upstream;
this.upstream = SubscriptionHelper.CANCELLED;
if (s != null) {
s.cancel();
}
throw ExceptionHelper.wrapOrThrow(ex);
}
}
Throwable e = error;
if (e != null) {
throw ExceptionHelper.wrapOrThrow(e);
}
return value;
}
}
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