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Glassfish example source code file (JdbcConnPoolAppStatsProvider.java)

This example Glassfish source code file (JdbcConnPoolAppStatsProvider.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

countstatistic, countstatisticimpl, countstatisticimpl, jdbcconnpoolappstatsprovider, managedattribute, number, numconnacquired, probelistener, probelistener, probeparam, probeparam, rangestatisticimpl, string, string

The Glassfish JdbcConnPoolAppStatsProvider.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 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:
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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
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 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
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 */

package com.sun.enterprise.resource.pool.monitor;

import org.glassfish.external.probe.provider.annotations.ProbeListener;
import org.glassfish.external.probe.provider.annotations.ProbeParam;
import org.glassfish.external.statistics.CountStatistic;
import org.glassfish.external.statistics.RangeStatistic;
import org.glassfish.external.statistics.impl.CountStatisticImpl;
import org.glassfish.external.statistics.impl.RangeStatisticImpl;
import org.glassfish.external.statistics.impl.StatisticImpl;
import org.glassfish.gmbal.AMXMetadata;
import org.glassfish.gmbal.ManagedObject;
import org.glassfish.gmbal.Description;
import org.glassfish.gmbal.ManagedAttribute;
import org.glassfish.resource.common.PoolInfo;

/**
 * StatsProvider object for Jdbc pool monitoring grouped by application names.
 *
 * Implements various events related to jdbc pool monitoring and provides
 * objects to the calling modules that retrieve monitoring information.
 *
 * @author Shalini M
 */
@AMXMetadata(type="jdbc-connection-pool-app-mon", group="monitoring")
@ManagedObject
@Description("JDBC Connection pool Application based Statistics")
public class JdbcConnPoolAppStatsProvider {

    private RangeStatisticImpl numConnUsed = new RangeStatisticImpl(
            0, 0, 0,
            "NumConnUsed", StatisticImpl.UNIT_COUNT, "Provides connection usage " +
            "statistics. The total number of connections that are currently being " +
            "used, as well as information about the maximum number of connections " +
            "that were used (the high water mark).",
            System.currentTimeMillis(), System.currentTimeMillis());
    private CountStatisticImpl numConnAcquired = new CountStatisticImpl(
            "NumConnAcquired", StatisticImpl.UNIT_COUNT, "Number of logical " +
            "connections acquired from the pool.");
    private CountStatisticImpl numConnReleased = new CountStatisticImpl(
            "NumConnReleased", StatisticImpl.UNIT_COUNT, "Number of logical " +
            "connections released to the pool.");
    private final String JDBC_APP_PROBE_LISTENER = "glassfish:jdbc-pool:applications:";
    private PoolInfo poolInfo;
    private String appName;
    private String poolName;

    public JdbcConnPoolAppStatsProvider(PoolInfo poolInfo, String appName) {
        this.poolInfo = poolInfo;
        this.poolName = poolInfo.getName();
        this.appName = appName;
    }

    public String getPoolName() {
        return this.poolName;
    }

    public String getAppName() {
        return this.appName;
    }
    
    @ProbeListener(JDBC_APP_PROBE_LISTENER + "decrementConnectionUsedEvent")
    public void decrementConnectionUsedEvent(
            @ProbeParam("poolName") String poolName,
            @ProbeParam("appName") String appName) {
	// handle the num conn used decrement event
        if((poolName != null) && (poolName.equals(this.poolName))) {
            if (appName != null && appName.equals(this.appName)) {
                //Decrement numConnUsed counter
                synchronized (numConnUsed) {
                    numConnUsed.setCurrent(numConnUsed.getCurrent() - 1);
                }
            }
        }
    }

    /**
     * Connection used event
     * @param poolName
     * @param appName
     */
    @ProbeListener(JDBC_APP_PROBE_LISTENER + "connectionUsedEvent")
    public void connectionUsedEvent(
            @ProbeParam("poolName") String poolName,
            @ProbeParam("appName") String appName) {
	// handle the connection used event
        if((poolName != null) && (poolName.equals(this.poolName))) {
            if (appName != null && appName.equals(this.appName)) {
                //increment numConnUsed
                synchronized (numConnUsed) {
                    numConnUsed.setCurrent(numConnUsed.getCurrent() + 1);
                }
            }
        }
    }

    /**
     * When a connection is acquired increment counter
     */
    @ProbeListener(JDBC_APP_PROBE_LISTENER + "connectionAcquiredEvent")
    public void connectionAcquiredEvent(
            @ProbeParam("poolName") String poolName,
            @ProbeParam("appName") String appName) {
        if((poolName != null) && (poolName.equals(this.poolName))) {
            if (appName != null && appName.equals(this.appName)) {
                numConnAcquired.increment();
            }
        }
    }

    /**
     * When a connection is released increment counter
     */
    @ProbeListener(JDBC_APP_PROBE_LISTENER + "connectionReleasedEvent")
    public void connectionReleasedEvent(
            @ProbeParam("poolName") String poolName,
            @ProbeParam("appName") String appName) {
        if((poolName != null) && (poolName.equals(this.poolName))) {
            if (appName != null && appName.equals(this.appName)) {
                numConnReleased.increment();
            }
        }
    }

    @ManagedAttribute(id="numconnused")
    public RangeStatistic getNumConnUsed() {
        return numConnUsed.getStatistic();
    }

    @ManagedAttribute(id="numconnacquired")
    public CountStatistic getNumConnAcquired() {
        return numConnAcquired.getStatistic();
    }

    @ManagedAttribute(id="numconnreleased")
    public CountStatistic getNumConnReleased() {
        return numConnReleased.getStatistic();
    }

}

Other Glassfish examples (source code examples)

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

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