/**
* 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 java.util.concurrent.
CountDownLatch;
/**
* Utility functions relating to blocking types.
* <p/>
* Not intended to be part of the public API.
* @since 1.3
*/
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.
*/
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
IllegalStateException("Interrupted while waiting for subscription to complete.",
e);
}
}
}