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/********************************************************************************
* Copyright (c) 2002, 2006 IBM Corporation. All rights reserved.
* This program and the accompanying materials are made available under the terms
* of the Eclipse Public License v1.0 which accompanies this distribution, and is
* available at http://www.eclipse.org/legal/epl-v10.html
*
* Initial Contributors:
* The following IBM employees contributed to the Remote System Explorer
* component that contains this file: David McKnight, Kushal Munir,
* Michael Berger, David Dykstal, Phil Coulthard, Don Yantzi, Eric Simpson,
* Emily Bruner, Mazen Faraj, Adrian Storisteanu, Li Ding, and Kent Hawley.
*
* Contributors:
* {Name} (company) - description of contribution.
********************************************************************************/
package org.eclipse.dstore.core.model;
/**
* The Handler class is the base class for the threaded mechanisms in
* the DataStore. This is a thread that periodically does some activity.
* The frequency of handling can be configured.
*/
public abstract class Handler extends Thread
{
protected int _waitIncrement;
protected DataStore _dataStore;
protected boolean _keepRunning;
/**
* Constructor
*/
public Handler()
{
_keepRunning = true;
_waitIncrement = 100;
}
/**
* Sets the time interval to wait between handling
* @param value the wait interval
*/
public void setWaitTime(int value)
{
_waitIncrement = value;
}
/**
* Returns the time interval to wait between handling
* @return the wait interval
*/
public int getWaitTime()
{
return _waitIncrement;
}
/**
* Sets the associated DataStore
* @param dataStore
*/
public void setDataStore(DataStore dataStore)
{
_dataStore = dataStore;
}
/**
* Indicates whether the handler is finished or not
* @return whether the handler is finished or not
*/
public boolean isFinished()
{
return !_keepRunning;
}
/**
* Finish handling
*/
public void finish()
{
if (_keepRunning)
{
_waitIncrement = 0;
_keepRunning = false;
/* causes hang
try
{
interrupt();
join();
}
catch (InterruptedException e)
{
System.out.println(e);
}
*/
handle();
}
}
/**
* Implemented to provide the periodic activity to be done in a handler.
* This method is called between wait intervals by the handler thread.
*/
public abstract void handle();
/**
* Runs the handler loop in a thread.
*/
public void run()
{
while (_keepRunning)
{
/*
try
{
Thread.sleep(_waitIncrement);
Thread.yield();
}
catch (InterruptedException e)
{
e.printStackTrace();
finish();
return;
}
*/
waitForInput();
handle();
}
}
/**
* Causes the current thread to wait until this class request has been
* fulfilled.
*/
public synchronized void waitForInput()
{
try
{
wait();
}
catch (InterruptedException e)
{
e.printStackTrace();
finish();
return;
}
}
/**
* Causes all threads waiting for this class request to be filled
* to wake up.
*/
public synchronized void notifyInput()
{
notifyAll();
}
}
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