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/*
* libjingle
* Copyright 2015 Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.webrtc;
import android.os.Handler;
import java.util.concurrent.Callable;
import java.util.concurrent.CountDownLatch;
final class ThreadUtils {
/**
* Utility class to be used for checking that a method is called on the correct thread.
*/
public static class ThreadChecker {
private Thread thread = Thread.currentThread();
public void checkIsOnValidThread() {
if (thread == null) {
thread = Thread.currentThread();
}
if (Thread.currentThread() != thread) {
throw new IllegalStateException("Wrong thread");
}
}
public void detachThread() {
thread = null;
}
}
/**
* Utility interface to be used with executeUninterruptibly() to wait for blocking operations
* to complete without getting interrupted..
*/
public interface BlockingOperation {
void run() throws InterruptedException;
}
/**
* Utility method to make sure a blocking operation is executed to completion without getting
* interrupted. This should be used in cases where the operation is waiting for some critical
* work, e.g. cleanup, that must complete before returning. If the thread is interrupted during
* the blocking operation, this function will re-run the operation until completion, and only then
* re-interrupt the thread.
*/
public static void executeUninterruptibly(BlockingOperation operation) {
boolean wasInterrupted = false;
while (true) {
try {
operation.run();
break;
} catch (InterruptedException e) {
// Someone is asking us to return early at our convenience. We can't cancel this operation,
// but we should preserve the information and pass it along.
wasInterrupted = true;
}
}
// Pass interruption information along.
if (wasInterrupted) {
Thread.currentThread().interrupt();
}
}
public static void joinUninterruptibly(final Thread thread) {
executeUninterruptibly(new BlockingOperation() {
@Override
public void run() throws InterruptedException {
thread.join();
}
});
}
public static void awaitUninterruptibly(final CountDownLatch latch) {
executeUninterruptibly(new BlockingOperation() {
@Override
public void run() throws InterruptedException {
latch.await();
}
});
}
/**
* Post |callable| to |handler| and wait for the result.
*/
public static <V> V invokeUninterruptibly(final Handler handler, final Callable<V> callable) {
class Result {
public V value;
}
final Result result = new Result();
final CountDownLatch barrier = new CountDownLatch(1);
handler.post(new Runnable() {
@Override public void run() {
try {
result.value = callable.call();
} catch (Exception e) {
throw new RuntimeException("Callable threw exception: " + e);
}
barrier.countDown();
}
});
awaitUninterruptibly(barrier);
return result.value;
}
/**
* Post |runner| to |handler| and wait for the result.
*/
public static void invokeUninterruptibly(final Handler handler, final Runnable runner) {
final CountDownLatch barrier = new CountDownLatch(1);
handler.post(new Runnable() {
@Override public void run() {
runner.run();
barrier.countDown();
}
});
awaitUninterruptibly(barrier);
}
}
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