/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* 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 com.espertech.esper.timer.TimeSourceService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Convenience view for dispatching view updates received from a parent view to update listeners
* via the dispatch service.
*/
public class UpdateDispatchViewBlockingSpin extends UpdateDispatchViewBase {
private UpdateDispatchFutureSpin currentFutureSpin;
private long msecTimeout;
private TimeSourceService timeSourceService;
/**
* Ctor.
*
* @param dispatchService - for performing the dispatch
* @param msecTimeout - timeout for preserving dispatch order through blocking
* @param statementResultService - handles result delivery
* @param timeSourceService time source provider
*/
public UpdateDispatchViewBlockingSpin(StatementResultService statementResultService, DispatchService dispatchService, long msecTimeout, TimeSourceService timeSourceService) {
super(statementResultService, dispatchService);
this.currentFutureSpin = new UpdateDispatchFutureSpin(timeSourceService); // use a completed future as a start
this.msecTimeout = msecTimeout;
this.timeSourceService = timeSourceService;
}
public void update(EventBean[] newData, EventBean[] oldData) {
newResult(new UniformPair<EventBean[]>(newData, oldData));
}
public void newResult(UniformPair<EventBean[]> result) {
statementResultService.indicate(result);
if (!isDispatchWaiting.get()) {
UpdateDispatchFutureSpin nextFutureSpin;
synchronized (this) {
nextFutureSpin = new UpdateDispatchFutureSpin(this, currentFutureSpin, msecTimeout, timeSourceService);
currentFutureSpin = nextFutureSpin;
}
dispatchService.addExternal(nextFutureSpin);
isDispatchWaiting.set(true);
}
}
private static Logger log = LoggerFactory.getLogger(UpdateDispatchViewBlockingSpin.class);
}