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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.qpid.console;
import java.util.HashMap;
public class SequenceManager
{
private long sequence = 0;
private HashMap<Long, Object> pending = new HashMap<Long, Object>();
private Object lockObject = new Object();
public SequenceManager()
{
}
public Object release(long seq)
{
Object returnValue = null;
synchronized (lockObject)
{
returnValue = pending.get(seq);
pending.remove(seq);
}
return returnValue;
}
public long reserve(Object data)
{
long returnValue = 0;
synchronized (lockObject)
{
returnValue = sequence;
sequence += 1;
pending.put(returnValue, data);
}
return returnValue;
}
}
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