com.hazelcast.client.impl.ClientLockReferenceIdGenerator Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2017, 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.client.impl;
import java.util.concurrent.atomic.AtomicLong;
/**
* This class generates unique (per client) incrementing reference ID which is used during locking related requests.
* The server side uses this ID to match if any previous request with the same ID was issued and shall not re-do the lock related
* operation but it shall just return the previous result. Hence, this ID identifies the outstanding request sent to the server
* side for locking operations. Similarly, if the client resends the request to the server for some reason it will use the same
* reference ID to make sure that the operation is not executed more than once at the server side.
*/
public final class ClientLockReferenceIdGenerator {
private AtomicLong referenceIdCounter = new AtomicLong();
/**
* @return A per client unique reference ID
*/
public long getNextReferenceId() {
return referenceIdCounter.incrementAndGet();
}
}