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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2008-2011 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
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 * 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.internal.data;

import com.sun.enterprise.config.serverbeans.ApplicationConfig;
import org.glassfish.internal.deployment.ExtendedDeploymentContext;
import org.glassfish.api.deployment.ApplicationContainer;
import org.glassfish.api.deployment.Deployer;
import org.glassfish.api.deployment.ApplicationContext;
import org.glassfish.api.ActionReport;
import org.jvnet.hk2.config.TransactionFailure;

import java.util.logging.Level;
import java.beans.PropertyVetoException;

import com.sun.enterprise.config.serverbeans.Engine;

/**
 * When a module is attached to a LoadedEngine, it creates an Engine reference. Each module
 * of an application can be loaded in several engines, however, a particular module can
 * only be loaded once in a particular engine.
 *
 * @author Jerome Dochez
 */
public class EngineRef {

    final private EngineInfo ctrInfo;

    private ApplicationContainer appCtr;

    private ApplicationConfig appConfig = null;

    public EngineRef(EngineInfo container,  ApplicationContainer appCtr) {
        this.ctrInfo = container;
        this.appCtr = appCtr;
    }

    /**
     * Returns the container associated with this application
     *
     * @return the container for this application
     */
    public EngineInfo getContainerInfo() {
        return ctrInfo;
    }

    /**
     * Set the contaier associated with this application
     * @param appCtr the container for this application
     */
    public void setApplicationContainer(ApplicationContainer appCtr) {
        this.appCtr = appCtr;
    }

    /**
     * Returns the contaier associated with this application
     * @return the container for this application
     */
    public ApplicationContainer getApplicationContainer() {
        return appCtr;
    }

    public void setApplicationConfig(final ApplicationConfig config) {
        appConfig = config;
    }

    public ApplicationConfig getApplicationConfig() {
        return appConfig;
    }

    public void load(ExtendedDeploymentContext context, ProgressTracker tracker) {
        getContainerInfo().load(context);
        tracker.add("loaded", EngineRef.class, this);

    }

    public boolean start(ApplicationContext context, ProgressTracker tracker)
        throws Exception {

        if (appCtr==null) {
            // the container does not care to be started or stopped
            return true;
        }
        if (!appCtr.start(context)) {
            return false;
        }

        tracker.add("started", EngineRef.class, this);
        return true;
    }

    /**
     * unloads the module from its container.
     *
     * @param context unloading context
     * @return
     */
    public boolean unload(ExtendedDeploymentContext context) {

        ActionReport report = context.getActionReport();
        // then remove the application from the container
        Deployer deployer = ctrInfo.getDeployer();
        try {
            deployer.unload(appCtr, context);
            ctrInfo.unload(context);
        } catch(Exception e) {
            report.failure(context.getLogger(), "Exception while shutting down application container", e);
            return false;
        }
        appCtr=null;
        return true;
    }

    /**
     * Stops a module, meaning that components implemented by this module should not be accessed
     * by external modules
     *
     * @param context stopping context
     * @return
     */
    public boolean stop(ApplicationContext context) {

       return appCtr.stop(context);
    }

    public void clean(ExtendedDeploymentContext context) {

        try {
            getContainerInfo().clean(context);            
        } catch (Exception e) {
            context.getLogger().log(Level.WARNING, "Exception while cleaning module '" + this + "'" + e, e);
        }
    }

    /**
     * Saves its state to the configuration. this method must be called within a transaction
     * to the configured engine instance.
     *
     * @param engine the engine configuration being persisted
     */
    public void save(Engine engine) throws TransactionFailure, PropertyVetoException {
        engine.setSniffer(getContainerInfo().getSniffer().getModuleType());
        if (appConfig != null) {
            engine.setApplicationConfig(appConfig);
        }
    }

}