package org.apache.fulcrum.yaafi.interceptor.jamon;
import com.jamonapi.Monitor;
import com.jamonapi.MonitorFactory;
import com.jamonapi.RangeHolder;
import org.apache.fulcrum.yaafi.interceptor.util.MethodToStringBuilderImpl;
import java.lang.reflect.Method;
/**
* Ecapsulating the JAMon 2.x related API calls. JAMon 2.x allows for a much
* more powerful integration with Avalon services :
* <ul>
* <li>custom ranges/units</li>
* <li>exception monitoring</li>
* <li>smooth web interface</li>
* </ul>
*
* @author <a href="mailto:siegfried.goeschl@it20one.at">Siegfried Goeschl</a>
*/
public class Jamon2PerformanceMonitorImpl implements JamonPerformanceMonitor
{
/** the default label being used */
private static final String MONITOR_LABEL = "ms.services";
/** is monitoring enabled */
private boolean isActive;
/** the method currenty monitored */
private Method method;
/** the global JAMON monitor */
private Monitor monitor;
/** the time the monitoring was started */
private long startTime;
static
{
// configure the unit/ranges only once
MonitorFactory.setRangeDefault(MONITOR_LABEL, createMSHolder());
}
/**
* Constructor.
*
* @param serviceName the service name of the service being monitored
* @param method the method to be monitored
* @param isActive is this an active monitor
*/
public Jamon2PerformanceMonitorImpl(String serviceName, Method method, Boolean isActive)
{
this.method = method;
this.isActive = isActive.booleanValue();
}
/**
* Start the monitor.
*/
public void start()
{
if(this.isActive)
{
this.startTime = System.currentTimeMillis();
MethodToStringBuilderImpl methodToStringBuilder = new MethodToStringBuilderImpl(this.method, 0);
String methodSignature = methodToStringBuilder.toString();
this.monitor = MonitorFactory.getMonitor(methodSignature, MONITOR_LABEL);
this.monitor.start();
}
}
/**
* Stop the monitor
*/
public void stop()
{
if(this.isActive)
{
long duration = System.currentTimeMillis() - this.startTime;
this.monitor.add(duration);
this.monitor.stop();
}
}
/**
* Stop the monitor
*/
public void stop(Throwable throwable)
{
if(this.isActive)
{
// use a negative execution time to mark an exception for an affiliate
this.monitor.add(-1);
this.monitor.stop();
}
}
/**
* Create a performance report.
*
* @return the textual performance report
* @throws Exception generating the report failed
*/
public String createReport() throws Exception
{
return MonitorFactory.getRootMonitor().getReport();
}
/**
* @return a customized range holder for measuring the execution time for services.
*/
private static RangeHolder createMSHolder() {
RangeHolder result = new RangeHolder("<");
result.add("Exceptions",0);
result.add("0_10ms",10);
result.add("10_20ms",20);
result.add("20_40ms",40);
result.add("40_80ms",80);
result.add("80_160ms",160);
result.add("160_320ms",320);
result.add("320_640ms",640);
result.add("640_1280ms",1280);
result.add("1280_2560ms",2560);
result.add("2560_5120ms",5120);
result.add("5120_10240ms",10240);
result.add("10240_20480ms",20480);
result.addLastHeader("20480ms_");
// note last range is always called lastRange and is added automatically
return result;
}
}