com.hazelcast.internal.nearcache.impl.invalidation.InvalidationQueue Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2018, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.internal.nearcache.impl.invalidation;
import com.hazelcast.nio.serialization.SerializableByConvention;
import java.util.Collection;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
@SerializableByConvention
public final class InvalidationQueue extends ConcurrentLinkedQueue {
private final AtomicInteger elementCount = new AtomicInteger(0);
private final AtomicBoolean flushingInProgress = new AtomicBoolean(false);
@Override
public int size() {
return elementCount.get();
}
@Override
public boolean offer(T invalidation) {
boolean offered = super.offer(invalidation);
if (offered) {
elementCount.incrementAndGet();
}
return offered;
}
@Override
public T poll() {
T invalidation = super.poll();
if (invalidation != null) {
elementCount.decrementAndGet();
}
return invalidation;
}
public boolean tryAcquire() {
return flushingInProgress.compareAndSet(false, true);
}
public void release() {
flushingInProgress.set(false);
}
@Override
public boolean add(T invalidation) {
throw new UnsupportedOperationException();
}
@Override
public T remove() {
throw new UnsupportedOperationException();
}
@Override
public boolean remove(Object o) {
throw new UnsupportedOperationException();
}
@Override
public boolean addAll(Collection c) {
throw new UnsupportedOperationException();
}
@Override
public boolean removeAll(Collection c) {
throw new UnsupportedOperationException();
}
@Override
public boolean retainAll(Collection c) {
throw new UnsupportedOperationException();
}
@Override
public void clear() {
throw new UnsupportedOperationException();
}
}