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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.util;
import java.util.concurrent.CountDownLatch;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.internal.schedulers.NonBlockingThread;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
/**
* Utility methods for helping common blocking operations.
*/
public final class BlockingHelper {
/** Utility class. */
private BlockingHelper() {
throw new IllegalStateException("No instances!");
}
public static void awaitForComplete(CountDownLatch latch, Disposable subscription) {
if (latch.getCount() == 0) {
// Synchronous observable completes before awaiting for it.
// Skip await so InterruptedException will never be thrown.
return;
}
// block until the subscription completes and then return
try {
verifyNonBlocking();
latch.await();
} catch (InterruptedException e) {
subscription.dispose();
// set the interrupted flag again so callers can still get it
// for more information see https://github.com/ReactiveX/RxJava/pull/147#issuecomment-13624780
Thread.currentThread().interrupt();
// using Runtime so it is not checked
throw new IllegalStateException("Interrupted while waiting for subscription to complete.", e);
}
}
/**
* Checks if the {@code failOnNonBlockingScheduler} plugin setting is enabled and the current
* thread is a Scheduler sensitive to blocking operators.
* @throws IllegalStateException if the {@code failOnNonBlockingScheduler} and the current thread is sensitive to blocking
*/
public static void verifyNonBlocking() {
if (RxJavaPlugins.isFailOnNonBlockingScheduler()
&& (Thread.currentThread() instanceof NonBlockingThread
|| RxJavaPlugins.onBeforeBlocking())) {
throw new IllegalStateException("Attempt to block on a Scheduler " + Thread.currentThread().getName() + " that doesn't support blocking operators as they may lead to deadlock");
}
}
}
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