/*
* Copyright (c) 2008-2013, 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.concurrent.atomiclong.operations;
import com.hazelcast.concurrent.atomiclong.LongWrapper;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.spi.Operation;
import java.io.IOException;
public class CompareAndSetOperation extends AtomicLongBackupAwareOperation {
private long expect;
private long update;
private boolean returnValue;
public CompareAndSetOperation() {
}
public CompareAndSetOperation(String name, long expect, long update) {
super(name);
this.expect = expect;
this.update = update;
}
@Override
public void run() throws Exception {
LongWrapper number = getNumber();
returnValue = number.compareAndSet(expect, update);
shouldBackup = !returnValue;
}
@Override
public Object getResponse() {
return returnValue;
}
@Override
protected void writeInternal(ObjectDataOutput out) throws IOException {
super.writeInternal(out);
out.writeLong(expect);
out.writeLong(update);
}
@Override
protected void readInternal(ObjectDataInput in) throws IOException {
super.readInternal(in);
expect = in.readLong();
update = in.readLong();
}
public Operation getBackupOperation() {
return new SetBackupOperation(name, update);
}
}