/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package com.espertech.esper.core.service;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.collection.UniformPair;
import com.espertech.esper.dispatch.DispatchService;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Convenience view for dispatching view updates received from a parent view to update listeners
* via the dispatch service.
*/
public class UpdateDispatchViewBlockingWait extends UpdateDispatchViewBase
{
private UpdateDispatchFutureWait currentFutureWait;
private long msecTimeout;
/**
* Ctor.
* @param dispatchService - for performing the dispatch
* @param msecTimeout - timeout for preserving dispatch order through blocking
* @param statementResultServiceImpl - handles result delivery
*/
public UpdateDispatchViewBlockingWait(StatementResultService statementResultServiceImpl, DispatchService dispatchService, long msecTimeout)
{
super(statementResultServiceImpl, dispatchService);
this.currentFutureWait = new UpdateDispatchFutureWait(); // use a completed future as a start
this.msecTimeout = msecTimeout;
}
public void update(EventBean[] newData, EventBean[] oldData) {
newResult(new UniformPair<EventBean[]>(newData, oldData));
}
public void newResult(UniformPair<EventBean[]> results)
{
statementResultService.indicate(results);
if (!isDispatchWaiting.get())
{
UpdateDispatchFutureWait nextFutureWait;
synchronized(this)
{
nextFutureWait = new UpdateDispatchFutureWait(this, currentFutureWait, msecTimeout);
currentFutureWait.setLater(nextFutureWait);
currentFutureWait = nextFutureWait;
}
dispatchService.addExternal(nextFutureWait);
isDispatchWaiting.set(true);
}
}
private static Log log = LogFactory.getLog(UpdateDispatchViewBlockingWait.class);
}