rx.internal.util.BlockingUtils Maven / Gradle / Ivy
/**
* Copyright 2015 Netflix, Inc.
*
* 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 rx.internal.util;
import rx.Subscription;
import rx.annotations.Experimental;
import java.util.concurrent.CountDownLatch;
/**
* Utility functions relating to blocking types.
*
* Not intended to be part of the public API.
*/
@Experimental
public final class BlockingUtils {
private BlockingUtils() { }
/**
* Blocks and waits for a {@link Subscription} to complete.
*
* @param latch a CountDownLatch
* @param subscription the Subscription to wait on.
*/
@Experimental
public static void awaitForComplete(CountDownLatch latch, Subscription 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 {
latch.await();
} catch (InterruptedException e) {
subscription.unsubscribe();
// 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 RuntimeException("Interrupted while waiting for subscription to complete.", e);
}
}
}