/*
* *************************************************************************************
* 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.context.mgr;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.core.context.util.AgentInstanceContext;
import com.espertech.esper.core.context.util.EPStatementAgentInstanceHandle;
import com.espertech.esper.core.service.EPStatementHandleCallback;
import com.espertech.esper.core.service.ExtensionServicesContext;
import com.espertech.esper.core.service.StatementAgentInstanceFilterVersion;
import com.espertech.esper.epl.spec.ContextDetailConditionTimePeriod;
import com.espertech.esper.pattern.MatchedEventMap;
import com.espertech.esper.schedule.ScheduleHandleCallback;
import com.espertech.esper.schedule.ScheduleSlot;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.Collections;
public class ContextControllerConditionTimePeriod implements ContextControllerCondition {
private static final Log log = LogFactory.getLog(ContextControllerConditionTimePeriod.class);
private final String contextName;
private final AgentInstanceContext agentInstanceContext;
private final ScheduleSlot scheduleSlot;
private final ContextDetailConditionTimePeriod spec;
private final ContextControllerConditionCallback callback;
private EPStatementHandleCallback scheduleHandle;
public ContextControllerConditionTimePeriod(String contextName, AgentInstanceContext agentInstanceContext, ScheduleSlot scheduleSlot, ContextDetailConditionTimePeriod spec, ContextControllerConditionCallback callback) {
this.contextName = contextName;
this.agentInstanceContext = agentInstanceContext;
this.scheduleSlot = scheduleSlot;
this.spec = spec;
this.callback = callback;
}
public void activate(EventBean optionalTriggerEvent, MatchedEventMap priorMatches, long timeOffset) {
startContextCallback(timeOffset);
}
public void deactivate() {
endContextCallback();
}
public boolean isRunning() {
return scheduleHandle != null;
}
private void startContextCallback(long timeOffset) {
ScheduleHandleCallback scheduleCallback = new ScheduleHandleCallback() {
public void scheduledTrigger(ExtensionServicesContext extensionServicesContext)
{
scheduleHandle = null; // terminates automatically unless scheduled again
callback.rangeNotification(Collections.<String, Object>emptyMap(), ContextControllerConditionTimePeriod.this, null, null);
}
};
EPStatementAgentInstanceHandle agentHandle = new EPStatementAgentInstanceHandle(agentInstanceContext.getStatementContext().getEpStatementHandle(), agentInstanceContext.getStatementContext().getDefaultAgentInstanceLock(), -1, new StatementAgentInstanceFilterVersion());
scheduleHandle = new EPStatementHandleCallback(agentHandle, scheduleCallback);
Double interval = (Double) spec.getTimePeriod().evaluate(null, true, agentInstanceContext);
if (interval == null) {
log.warn("Time period expression in context '" + contextName + "' returned a null value, not scheduling time period");
}
else {
long msec = (long) (interval * 1000L) - timeOffset;
agentInstanceContext.getStatementContext().getSchedulingService().add(msec, scheduleHandle, scheduleSlot);
}
}
private void endContextCallback() {
if (scheduleHandle!= null) {
agentInstanceContext.getStatementContext().getSchedulingService().remove(scheduleHandle, scheduleSlot);
}
scheduleHandle = null;
}
public Long getExpectedEndTime() {
Double interval = (Double) spec.getTimePeriod().evaluate(null, true, agentInstanceContext);
if (interval != null) {
return agentInstanceContext.getStatementContext().getTimeProvider().getTime() + ((long) (interval * 1000L));
}
return null;
}
}