ua.mobius.javax.media.mscontrol.container.InvocationLock Maven / Gradle / Ivy
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* v. 2.0 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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/*
* 15/07/13 - Change notice:
* This file has been modified by Mobius Software Ltd.
* For more information please visit http://www.mobius.ua
*/
package ua.mobius.javax.media.mscontrol.container;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
import javax.media.mscontrol.MsControlException;
import javax.media.mscontrol.join.JoinEvent;
/**
* Locks method calls till join event.
*
* @author kulikov
*/
public class InvocationLock {
private Semaphore semaphore = new Semaphore(0);
private long timestamp;
public void lock(long timeout) throws MsControlException {
//clean last event
timestamp = System.currentTimeMillis();
//try to wait
try {
semaphore.tryAcquire(1, timeout, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
throw new MsControlException("Interrupted");
}
long duration = System.currentTimeMillis() - timestamp;
//no new even was receive during timeout period
if (duration >= timeout) {
throw new MsControlException("No response from server during " + timeout + " ms");
}
}
public void release() {
semaphore.release();
}
}