/**************************************************************************************
* 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.epl.metric;
import com.espertech.esper.client.metric.StatementMetric;
/**
* Metrics execution producing statement metric events.
*/
public class MetricExecStatement implements MetricExec
{
private final MetricEventRouter metricEventRouter;
private final MetricScheduleService metricScheduleService;
private final int statementGroup;
private long interval;
/**
* Ctor.
* @param metricEventRouter for routing metric events
* @param metricScheduleService for scheduling a new execution
* @param interval for rescheduling the execution
* @param statementGroup group number of statement group
*/
public MetricExecStatement(MetricEventRouter metricEventRouter, MetricScheduleService metricScheduleService, long interval, int statementGroup)
{
this.metricEventRouter = metricEventRouter;
this.metricScheduleService = metricScheduleService;
this.interval = interval;
this.statementGroup = statementGroup;
}
public void execute(MetricExecutionContext context)
{
long timestamp = metricScheduleService.getCurrentTime();
StatementMetric[] metrics = context.getStatementMetricRepository().reportGroup(statementGroup);
if (metrics != null)
{
for (int i = 0; i < metrics.length; i++)
{
StatementMetric metric = metrics[i];
if (metric != null)
{
metric.setTimestamp(timestamp);
metricEventRouter.route(metrics[i]);
}
}
}
if (interval != -1)
{
metricScheduleService.add(interval, this);
}
}
/**
* Set a new interval, cancels the existing schedule, re-establishes the new schedule if the interval is a
* positive number.
* @param newInterval to set
*/
public void setInterval(long newInterval)
{
interval = newInterval;
metricScheduleService.remove(this);
if (interval > 0)
{
metricScheduleService.add(interval, this);
}
}
/**
* Returns reporting interval.
* @return reporting interval
*/
public long getInterval()
{
return interval;
}
}