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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2012 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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 * 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
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package org.glassfish.web.admin.monitor;

import java.util.logging.Level;
import java.util.logging.Logger;
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.external.probe.provider.annotations.*;
import org.glassfish.gmbal.AMXMetadata;
import org.glassfish.gmbal.Description;
import org.glassfish.gmbal.ManagedAttribute;
import org.glassfish.gmbal.ManagedObject;
import org.glassfish.web.admin.LogFacade;

/**
 * Provides the monitoring data at the Web container level
 *
 * @author Prashanth Abbagani
 */
@AMXMetadata(type="servlet-mon", group="monitoring")
@ManagedObject
@Description("Web Container Servlet Statistics")
public class ServletStatsProvider {

    private static final Logger logger = LogFacade.getLogger();

    private static final String ACTIVE_SERVLETS_LOADED_DESCRIPTION =
        "Number of Servlets loaded";

    private static final String TOTAL_SERVLETS_LOADED_DESCRIPTION =
        "Total number of Servlets ever loaded";

    private static final String SERVLET_PROCESSING_TIMES_DESCRIPTION =
        "Cumulative Servlet processing times";

    private String moduleName;
    private String vsName;
    private RangeStatisticImpl activeServletsLoadedCount;
    private CountStatisticImpl totalServletsLoadedCount;
    private CountStatisticImpl servletProcessingTimes;
    
    public ServletStatsProvider(String moduleName, String vsName) {
        this.moduleName = moduleName;
        this.vsName = vsName;
        long curTime = System.currentTimeMillis();
        activeServletsLoadedCount = new RangeStatisticImpl(
            0L, 0L, 0L, "ActiveServletsLoaded", StatisticImpl.UNIT_COUNT,
            ACTIVE_SERVLETS_LOADED_DESCRIPTION, curTime, curTime);
        totalServletsLoadedCount = new CountStatisticImpl(
            "TotalServletsLoaded", StatisticImpl.UNIT_COUNT,
            TOTAL_SERVLETS_LOADED_DESCRIPTION);
        servletProcessingTimes = new CountStatisticImpl(
            "ServletProcessingTimes", StatisticImpl.UNIT_MILLISECOND,
            SERVLET_PROCESSING_TIMES_DESCRIPTION);
    }

    @ManagedAttribute(id="activeservletsloadedcount")
    @Description(ACTIVE_SERVLETS_LOADED_DESCRIPTION)
    public RangeStatistic getActiveServletsLoaded() {
        return activeServletsLoadedCount;
    }

    @ManagedAttribute(id="totalservletsloadedcount")
    @Description(TOTAL_SERVLETS_LOADED_DESCRIPTION)
    public CountStatistic getTotalServletsLoaded() {
        return totalServletsLoadedCount;
    }

    @ManagedAttribute(id="servletprocessingtimes")
    @Description(SERVLET_PROCESSING_TIMES_DESCRIPTION)
    public CountStatistic getServletProcessingTimes() {
        return servletProcessingTimes;
    }
    
    @ProbeListener("glassfish:web:servlet:servletInitializedEvent")
    public void servletInitializedEvent(
                    @ProbeParam("servletName") String servletName,
                    @ProbeParam("appName") String appName,
                    @ProbeParam("hostName") String hostName) {
        if (logger.isLoggable(Level.FINEST)) {
            logger.finest("Servlet Loaded event received - " +
                          "servletName = " + servletName +
                          ": appName = " + appName + ": hostName = " +
                          hostName);
        }
        if (isValidEvent(appName, hostName)) {
            synchronized (activeServletsLoadedCount) {
                activeServletsLoadedCount.setCurrent(
                    activeServletsLoadedCount.getCurrent() + 1);
            }
            totalServletsLoadedCount.increment();
        }   
    }

    @ProbeListener("glassfish:web:servlet:servletDestroyedEvent")
    public void servletDestroyedEvent(
                    @ProbeParam("servletName") String servletName,
                    @ProbeParam("appName") String appName,
                    @ProbeParam("hostName") String hostName) {
        if (logger.isLoggable(Level.FINEST)) {
            logger.finest("Servlet Destroyed event received - " +
                          "servletName = " + servletName +
                          ": appName = " + appName + ": hostName = " +
                          hostName);
        }
        if (isValidEvent(appName, hostName)) {
            synchronized (activeServletsLoadedCount) {
                activeServletsLoadedCount.setCurrent(
                    activeServletsLoadedCount.getCurrent() - 1);
            }
        }
    }
    
    private boolean isValidEvent(String mName, String hostName) {
        //Temp fix, get the appname from the context root
        if ((moduleName == null) || (vsName == null)) {
            return true;
        }
        if ((moduleName.equals(mName)) && (vsName.equals(hostName))) {
            return true;
        }
        
        return false;
    }

    public String getModuleName() {
        return moduleName;
    }
    
    public String getVSName() {
        return vsName;
    }

    void addServletProcessingTime(long servletProcessingTime) {
        servletProcessingTimes.increment(servletProcessingTime);
    }
}