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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.client;
import javax.jms.IllegalStateException;
import javax.jms.JMSException;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* Provides support for orderly shutdown of an object.
*/
public abstract class Closeable
{
/**
* We use an atomic boolean so that we do not have to synchronized access to this flag. Synchronizing
* access to this flag would mean have a synchronized block in every method.
*/
protected final AtomicBoolean _closed = new AtomicBoolean(false);
protected void checkNotClosed() throws JMSException
{
if (_closed.get())
{
throw new IllegalStateException("Object " + toString() + " has been closed");
}
}
public boolean isClosed()
{
return _closed.get();
}
public abstract void close() throws JMSException;
}
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