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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.qmf2.common;
/**
* Implementation of the Notifier Interface that provides a waitForWorkItem() method which blocks until the
* Console has called the indication() method indicating that there are WorkItems available.
* <p>
* This class isn't part of the QMF2 API however it's almost certainly how most clients would choose to use the
* Notifier API so it seems useful to provide an implementation.
*
* @author Fraser Adams
*/
public final class BlockingNotifier implements Notifier
{
private boolean _waiting = true;
/**
* This method blocks until the indication() method has been called, this is generally called by the Console
* when new WorkItems are made available.
*/
public synchronized void waitForWorkItem()
{
while (_waiting)
{
try
{
wait();
}
catch (InterruptedException ie)
{
continue;
}
}
_waiting = true;
}
/**
* Called to indicate the availability of WorkItems. This method unblocks waitForWorkItem()
*/
public synchronized void indication()
{
_waiting = false;
notifyAll();
}
}
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