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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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 org.mozilla.thirdparty.com.google.android.exoplayer2.util;
/**
* An interruptible condition variable whose {@link #open()} and {@link #close()} methods return
* whether they resulted in a change of state.
*/
public final class ConditionVariable {
private boolean isOpen;
/**
* Opens the condition and releases all threads that are blocked.
*
* @return True if the condition variable was opened. False if it was already open.
*/
public synchronized boolean open() {
if (isOpen) {
return false;
}
isOpen = true;
notifyAll();
return true;
}
/**
* Closes the condition.
*
* @return True if the condition variable was closed. False if it was already closed.
*/
public synchronized boolean close() {
boolean wasOpen = isOpen;
isOpen = false;
return wasOpen;
}
/**
* Blocks until the condition is opened.
*
* @throws InterruptedException If the thread is interrupted.
*/
public synchronized void block() throws InterruptedException {
while (!isOpen) {
wait();
}
}
/**
* Blocks until the condition is opened or until {@code timeout} milliseconds have passed.
*
* @param timeout The maximum time to wait in milliseconds.
* @return True if the condition was opened, false if the call returns because of the timeout.
* @throws InterruptedException If the thread is interrupted.
*/
public synchronized boolean block(long timeout) throws InterruptedException {
long now = android.os.SystemClock.elapsedRealtime();
long end = now + timeout;
while (!isOpen && now < end) {
wait(end - now);
now = android.os.SystemClock.elapsedRealtime();
}
return isOpen;
}
/** Returns whether the condition is opened. */
public synchronized boolean isOpen() {
return isOpen;
}
}
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