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package com.sun.jaspic.config.helper;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
/**
*
* @author Ron Monzillo
*/
public class EpochCarrier {
private Lock instanceReadLock;
private Lock instanceWriteLock;
private long epoch;
public EpochCarrier() {
ReentrantReadWriteLock instanceReadWriteLock = new ReentrantReadWriteLock();
instanceReadLock = instanceReadWriteLock.readLock();
instanceWriteLock = instanceReadWriteLock.writeLock();
epoch = 0L;
}
public long increment() {
instanceWriteLock.lock();
long before;
try {
before = epoch;
epoch = epoch + 1;
} finally {
instanceWriteLock.unlock();
}
return before;
}
public long getEpoch() {
instanceReadLock.lock();
try {
return epoch;
} finally {
instanceReadLock.unlock();
}
}
public boolean hasChanged(long reference) {
instanceReadLock.lock();
try {
return epoch != reference;
} finally {
instanceReadLock.unlock();
}
}
}