/*   Derby - Class org.apache.derbyTesting.unitTests.services.T_Serviceable   Copyright 1997, 2005 The Apache Software Foundation or its licensors, as applicable.   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 org.apache.derbyTesting.unitTests.services;import org.apache.derbyTesting.unitTests.harness.T_Generic;import org.apache.derbyTesting.unitTests.harness.T_Fail;import org.apache.derby.iapi.services.context.Context;import org.apache.derby.iapi.services.context.ContextManager;import org.apache.derby.iapi.services.monitor.Monitor;import org.apache.derby.iapi.error.StandardException;import org.apache.derby.iapi.services.daemon.*;/**	This test implements serviceable for testing.  To facility testing, when	this object is being serviced, it will synchronize on itself and notity all	waiters.  Test driver may wait on this object and check timesServiced to	make sure the background daemon has run.*/public class T_Serviceable implements Serviceable{	// synchronized on this to look at the number 	// of times this object has been serviced	protected int timesServiced;	// constant for checking	protected final int timesRequeue;	protected final boolean onDemandOnly;	protected final boolean subscribed;	// use this to unsubscribe	protected int clientNumber;	// test enqueueing, t = number of times to requeue	public T_Serviceable(int t)	{		timesServiced = 0;		timesRequeue = t;		onDemandOnly = false;	// not looked at		subscribed = false;		clientNumber = -1;	}	// test subscription 	public T_Serviceable(boolean onDemandOnly)	{		timesServiced = 0;		timesRequeue = 0;		// not looked at		this.onDemandOnly = onDemandOnly;		subscribed = true;	}	protected void setClientNumber(int n)	{		clientNumber = n;	}	protected int getClientNumber()	{		return clientNumber;	}	/*	 *  Serviceable interface	 */	public synchronized int performWork(ContextManager context) 	{		context.toString();	// make sure context manager is not null;		timesServiced++;		notifyAll();			// notify anyone waiting for me to be serviced		if (!subscribed && timesRequeue > timesServiced)			return Serviceable.REQUEUE;		else			return Serviceable.DONE;	}		public boolean serviceASAP()	{		return true;	}	// @return true, if this work needs to be done on a user thread immediately	public boolean serviceImmediately()	{		return false;	}		/*	 * test utilities	 */	protected synchronized void t_wait(int n)	{		try		{			while (timesServiced < n)				wait();		}		catch (InterruptedException ie) {}	}	protected synchronized void t_check(int n) throws T_Fail	{		if (timesServiced != n)			throw T_Fail.testFailMsg("Expect to be serviced " + n + " times, instead serviced " + timesServiced);	}}