/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.invocation;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import EDU.oswego.cs.dl.util.concurrent.ConcurrentReaderHashMap;
/** A method invocation statistics collection class.
*
* @author Scott.Stark@jboss.org
* @version $Revision: 98925 $
*/
public class InvocationStatistics
implements Serializable
{
/** @since 4.2.0 */
private static final long serialVersionUID = -8031193044335393420L;
/** A HashMap<Method, TimeStatistic> of the method invocations */
private Map<Method, TimeStatistic> methodStats;
public long concurrentCalls = 0;
public long maxConcurrentCalls = 0;
public long lastResetTime = System.currentTimeMillis();
public class TimeStatistic
implements Serializable
{
/** @since 4.2.0 */
private static final long serialVersionUID = -8689933338506854386L;
public volatile long count;
public volatile long minTime = Long.MAX_VALUE;
public volatile long maxTime;
public volatile long totalTime;
public void reset()
{
count = 0;
minTime = Long.MAX_VALUE;
maxTime = 0;
totalTime = 0;
}
}
public InvocationStatistics()
{
methodStats = new ConcurrentReaderHashMap();
}
/** Update the TimeStatistic for the given method. This synchronizes on
* m to ensure that the TimeStatistic for m is updated atomically.
*
* @param m the method to update the statistics for.
* @param elapsed the elapsed time in milliseconds for the invocation.
*/
public void updateStats(Method m, long elapsed)
{
TimeStatistic stat = methodStats.get(m);
if (stat == null)
{
stat = new TimeStatistic();
methodStats.put(m, stat);
}
stat.count++;
stat.totalTime += elapsed;
if (stat.minTime > elapsed)
stat.minTime = elapsed;
if (stat.maxTime < elapsed)
stat.maxTime = elapsed;
}
public synchronized void callIn()
{
concurrentCalls++;
if (concurrentCalls > maxConcurrentCalls)
maxConcurrentCalls = concurrentCalls;
}
public synchronized void callOut()
{
concurrentCalls--;
}
/** Resets all current TimeStatistics.
*
*/
public void resetStats()
{
synchronized (methodStats)
{
Iterator iter = methodStats.values().iterator();
while (iter.hasNext())
{
TimeStatistic stat = (TimeStatistic) iter.next();
stat.reset();
}
}
maxConcurrentCalls = 0;
lastResetTime = System.currentTimeMillis();
}
/** Access the current collection of method invocation statistics
*
* @return A HashMap<Method, TimeStatistic> of the method invocations
*/
public Map getStats()
{
return methodStats;
}
/** Generate an XML fragement for the InvocationStatistics. The format is
* <InvocationStatistics concurrentCalls="c">
* <method name="aMethod" count="x" minTime="y" maxTime="z" totalTime="t" />
* ...
* </InvocationStatistics>
*
* @return an XML representation of the InvocationStatistics
*/
public String toString()
{
StringBuffer tmp = new StringBuffer("<InvocationStatistics concurrentCalls='");
tmp.append(concurrentCalls);
tmp.append("' >\n");
Iterator<Map.Entry<Method, TimeStatistic>> iter = methodStats.entrySet().iterator();
while (iter.hasNext())
{
Map.Entry<Method, TimeStatistic> entry = iter.next();
TimeStatistic stat = (TimeStatistic) entry.getValue();
if (stat != null)
{
tmp.append("<method name='");
tmp.append(entry.getKey());
tmp.append("' count='");
tmp.append(stat.count);
tmp.append("' minTime='");
tmp.append(stat.minTime);
tmp.append("' maxTime='");
tmp.append(stat.maxTime);
tmp.append("' totalTime='");
tmp.append(stat.totalTime);
tmp.append("' />\n");
}
}
tmp.append("</InvocationStatistics>");
return tmp.toString();
}
/**
* Converts the method invocation stats into a detyped nested map structure.
* The format is:
*
* {methodName => {statisticTypeName => longValue}}
*
* In addition some other global statistics are added under the fake
* method name #Global
*
* @return A map indexed by method name with map values indexed by statistic type
*/
public Map<String, Map<String, Long>> toDetypedMap()
{
Map<String, Map<String, Long>> detyped = new HashMap<String, Map<String, Long>>();
for (Map.Entry<Method, TimeStatistic> entry : methodStats.entrySet())
{
TimeStatistic stats = entry.getValue();
Map<String, Long> detypedStats = new HashMap<String, Long>(methodStats.size());
detypedStats.put("count", stats.count);
detypedStats.put("minTime", stats.minTime);
detypedStats.put("maxTime", stats.maxTime);
detypedStats.put("totalTime", stats.totalTime);
detyped.put(entry.getKey().getName(), detypedStats);
}
Map<String, Long> global = new HashMap<String, Long>();
global.put("concurrentCalls", concurrentCalls);
global.put("maxConcurrentCalls", maxConcurrentCalls);
global.put("lastResetTime", lastResetTime);
detyped.put("#Global", global);
return detyped;
}
}