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Glassfish example source code file (EjbMethodStatsProvider.java)

This example Glassfish source code file (EjbMethodStatsProvider.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Glassfish tags/keywords

arraylist, countstatistic, countstatisticimpl, countstatisticimpl, description, description, ejbmethodstatsprovider, log, logging, managedattribute, managedattribute, number, provides, provides, string, timestatisticimpl, util

The Glassfish EjbMethodStatsProvider.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2009-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
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 */

package com.sun.ejb.monitoring.stats;

import java.util.List;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.glassfish.external.probe.provider.annotations.*;
import org.glassfish.external.statistics.*;
import org.glassfish.external.statistics.impl.*;
import org.glassfish.gmbal.*;

import com.sun.ejb.containers.EjbContainerUtilImpl;

/**
 * Event listener for the Ejb monitoring events. Used by the probe framework 
 * to collect and display the data.
 *
 * @author Marina Vatkina
 */
// TODO: find the right names
// v2: com.sun.appserv:application=MEjbApp,name=getEJBHome,type=bean-method,category=monitor,ejb-module=mejb_jar,server=server,stateless-session-bean=MEJBBean
// v3: amx:pp=/mon/server-mon[server],type=bean-method-mon,name=??????????
@AMXMetadata(type="bean-method-mon", group="monitoring", isSingleton=false)
@ManagedObject
@Description("Ejb Method Statistics")
public class EjbMethodStatsProvider {

    private CountStatisticImpl executionStat = new CountStatisticImpl(
            "ExecutionTime", "Milliseconds", 
            "Provides the time in milliseconds spent during the last " 
                     + "successful/unsuccessful attempt to execute the operation.");

    private CountStatisticImpl invocationStat = new CountStatisticImpl(
            "TotalNumInvocations", "count", 
            "Provides the total number of invocations of the method.");

    private CountStatisticImpl errorStat = new CountStatisticImpl(
            "TotalNumErrors", "count", 
            "Provides the total number of errors that occured during invocation "
                    + "or execution of an operation.");

    private CountStatisticImpl successStat = new CountStatisticImpl(
                "TotalNumSuccess", "count", 
                "Provides the total number of successful invocations of the method.");

    private TimeStatisticImpl methodStat = null;

    private static ThreadLocal  execThreadLocal = new ThreadLocal();
    private String mname = null;
    private boolean registered = false;

    EjbMethodStatsProvider (String mname) {
        this.mname = mname;

        long now = System.currentTimeMillis();
        methodStat = new TimeStatisticImpl(
                0, 0, 0, 0, "MethodStatistic", "", 
                "Provides the number of times an operation was called, the total time "
                       + "that was spent during the invocation and so on", 
                now, now);
    }

    @ManagedAttribute(id="methodstatistic")
    @Description("Number of times the operation is called; total time spent during invocation, and so on.")
    public TimeStatistic getMethodStatistic() {
        return methodStat.getStatistic();
    }

    @ManagedAttribute(id="totalnumerrors")
    @Description("Number of times the method execution resulted in an exception")
    public CountStatistic getTotalNumErrors() {
        return errorStat;
    }

    @ManagedAttribute(id="totalnumsuccess")
    @Description("Number of times the method successfully executed")
    public CountStatistic getTotalNumSuccess() {
        return successStat;
    }

    @ManagedAttribute(id="executiontime")
    @Description("Time (ms) spent executing method for the last successful/unsuccessful " 
        + "attempt to execute the operation")
    public CountStatistic getTotalExecutionTime() {
        return executionStat;
    }

    public String getStringifiedMethodName() {
        return mname;
    }

    void registered() {
        registered = true;
    }

    void unregistered() {
        registered = false;
    }

    boolean isRegistered() {
        return registered;
    }

    void methodStart() {
        List list = (ArrayList) execThreadLocal.get();
        if (list == null) {
            list = new ArrayList(5);
            execThreadLocal.set(list);
        }
        list.add(new Long(System.currentTimeMillis()));
        invocationStat.increment();
    }

    void methodEnd(boolean success) {
        List list = (ArrayList) execThreadLocal.get();
        if ( (list != null) && (list.size() > 0) ) {
            int index = list.size();
            Long startTime = (Long) list.remove(index-1);
            if (success) {
                successStat.increment();
            } else {
                errorStat.increment();
            }
            if (startTime != null) {
                long diff = System.currentTimeMillis() - startTime.longValue();
                executionStat.setCount(diff);
                methodStat.incrementCount(diff);
            }
        }
    }
}

Other Glassfish examples (source code examples)

Here is a short list of links related to this Glassfish EjbMethodStatsProvider.java source code file:

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