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Groovy: A powerful, dynamic language for the JVM
package org.codehaus.groovy.util;
import java.util.concurrent.locks.AbstractQueuedSynchronizer;
/**
* A bit simplified lock designed to be inherited by.
*/
public class LockableObject extends AbstractQueuedSynchronizer {
transient Thread owner;
protected final boolean isHeldExclusively() {
return getState() != 0 && owner == Thread.currentThread();
}
public final void lock() {
if (compareAndSetState(0, 1))
owner = Thread.currentThread();
else
acquire(1);
}
public final void unlock() {
release(1);
}
protected final boolean tryAcquire(int acquires) {
final Thread current = Thread.currentThread();
int c = getState();
if (c == 0) {
if (compareAndSetState(0, acquires)) {
owner = current;
return true;
}
}
else if (current == owner) {
setState(c+ acquires);
return true;
}
return false;
}
protected final boolean tryRelease(int releases) {
int c = getState() - releases;
if (Thread.currentThread() != owner)
throw new IllegalMonitorStateException();
boolean free = false;
if (c == 0) {
free = true;
owner = null;
}
setState(c);
return free;
}
}