package org.infinispan.util.concurrent.locks.containers;
import net.jcip.annotations.ThreadSafe;
import org.infinispan.commons.equivalence.Equivalence;
import org.infinispan.util.concurrent.locks.OwnableReentrantLock;
import org.infinispan.util.logging.Log;
import org.infinispan.util.logging.LogFactory;
import java.util.Arrays;
import java.util.concurrent.TimeUnit;
/**
* A LockContainer that holds {@link org.infinispan.util.concurrent.locks.OwnableReentrantLock}s.
*
* @author Manik Surtani (<a href="mailto:manik@jboss.org">manik@jboss.org</a>)
* @see ReentrantStripedLockContainer
* @see org.infinispan.util.concurrent.locks.OwnableReentrantLock
* @since 4.0
*/
@ThreadSafe
public class OwnableReentrantStripedLockContainer extends AbstractStripedLockContainer<OwnableReentrantLock> {
private final OwnableReentrantLock[] sharedLocks;
private static final Log log = LogFactory.getLog(OwnableReentrantStripedLockContainer.class);
@Override
protected Log getLog() {
return log;
}
/**
* Creates a new LockContainer which uses a certain number of shared locks across all elements that need to be
* locked.
*
* @param concurrencyLevel concurrency level for number of stripes to create. Stripes are created in powers of two,
* with a minimum of concurrencyLevel created.
*/
public OwnableReentrantStripedLockContainer(int concurrencyLevel, Equivalence<Object> keyEquivalence) {
super(keyEquivalence);
int numLocks = calculateNumberOfSegments(concurrencyLevel);
sharedLocks = new OwnableReentrantLock[numLocks];
for (int i = 0; i < numLocks; i++) sharedLocks[i] = new OwnableReentrantLock();
}
@Override
public final OwnableReentrantLock getLock(Object object) {
return sharedLocks[hashToIndex(object)];
}
@Override
public final boolean ownsLock(Object object, Object owner) {
OwnableReentrantLock lock = getLock(object);
return owner.equals(lock.getOwner());
}
@Override
public final boolean isLocked(Object object) {
OwnableReentrantLock lock = getLock(object);
return lock.isLocked();
}
@Override
public final int getNumLocksHeld() {
int i = 0;
for (OwnableReentrantLock l : sharedLocks) if (l.isLocked()) i++;
return i;
}
@Override
public String toString() {
return "OwnableReentrantStripedLockContainer{" +
"sharedLocks=" + Arrays.toString(sharedLocks) +
'}';
}
@Override
public int size() {
return sharedLocks.length;
}
@Override
protected boolean tryLock(OwnableReentrantLock lock, long timeout, TimeUnit unit, Object lockOwner) throws InterruptedException {
return lock.tryLock(lockOwner, timeout, unit);
}
@Override
protected void lock(OwnableReentrantLock lock, Object lockOwner) {
lock.lock(lockOwner);
}
@Override
protected void unlock(OwnableReentrantLock l, Object owner) {
l.unlock(owner);
}
}