Glassfish example source code file (EngineInfo.java)

This example Glassfish source code file (EngineInfo.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

container, deployer, exception, field, field, inhabitant, log, logging, reflection, set, set, sniffer, threadlocalmap, u, u, util, weakreference, weakreference

The Glassfish EngineInfo.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2006-2010 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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 * 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
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 * 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 org.glassfish.api.container.Sniffer;
import org.glassfish.api.container.Container;
import org.glassfish.api.deployment.Deployer;
import org.glassfish.api.deployment.ApplicationContainer;
import org.glassfish.api.deployment.DeploymentContext;
import org.jvnet.hk2.component.Inhabitant;
import org.glassfish.internal.data.ApplicationInfo;
import org.glassfish.internal.deployment.ExtendedDeploymentContext;


import java.util.*;
import java.util.logging.Logger;
import java.util.logging.Level;
import java.lang.ref.WeakReference;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;

/**
 * This class holds information about a particular container such as a reference
 * to the sniffer, the container itself and the list of applications deployed in
 * that container.
 *
 * @author Jerome Dochez 
 */
public class EngineInfo<T extends Container, U extends ApplicationContainer> {

    final Inhabitant<T> container;
    final Sniffer sniffer;
    ContainerRegistry registry = null;
    Map<WeakReference> addedThreadLocals = new HashMap();
    Deployer deployer;

    /**
     * Creates a new ContractProvider info with references to the container, the sniffer
     * and the connector module implementing the ContractProvider/Deployer interfaces.
     *
     * @param container instance of the container
     * @param sniffer sniffer associated with that container
     */
    public EngineInfo(Inhabitant<T> container, Sniffer sniffer, ClassLoader cloader) {
        this.container = container;
        this.sniffer = sniffer;
    }

    /**
     * Returns the container instance
     * @return the container instance
     */
    public T getContainer() {
        return container.get();
    }

    /**
     * Returns the sniffer associated with this container
     * @return the sniffer instance
     */
    public Sniffer getSniffer() {
        return sniffer;
    }

    /**
     * Returns the deployer instance for this container
     *
     * @return Deployer instance
     */
    public Deployer<T, U> getDeployer() {
        return deployer;
    }

    /**
     * Sets the deployer associated with this container
     * 
     * @param deployer
     */
    public void setDeployer(Deployer<T, U> deployer) {
        this.deployer = deployer;
    }

    public void load(ExtendedDeploymentContext context) {
    }

    public void unload(ExtendedDeploymentContext context) throws Exception {
    }

    public void clean(ExtendedDeploymentContext context) throws Exception {
        getDeployer().clean(context);
    }

    /*
     * Sets the registry this container belongs to
     * @param the registry owning me
     */
    public void setRegistry(ContainerRegistry registry) {
        this.registry = registry;
    }

    /**
     * Adds number of threadlocal hashcodes
     */
    public synchronized void addThreadLocal(Thread t, Set<Integer> newEntries) {

        Set<Integer> existingEntries = null;
        for (Map.Entry<WeakReference> entry : addedThreadLocals.entrySet()) {
            if (entry.getKey().get()!=null) {
                if (entry.getKey().get().equals(t)) {
                    // found our guy
                    existingEntries = entry.getValue();
                    break;
                }
            } else {
                // thread is dead, cleanup since we are at it.
                addedThreadLocals.remove(entry.getKey());
            }
        }
        if (existingEntries==null) {
            existingEntries = new HashSet();
            addedThreadLocals.put(new WeakReference(t), existingEntries);
        }
        
        existingEntries.addAll(newEntries);
    }

    private void cleanup() {
        for (Map.Entry<WeakReference> entry : addedThreadLocals.entrySet()) {
            if (entry.getKey().get()!=null) {
                try {
                    Field threadLocalsField = Thread.class.getDeclaredField("threadLocals");
                    threadLocalsField.setAccessible(true);
                    Class c = Class.forName("java.lang.ThreadLocal$ThreadLocalMap");
                    Field tableField = c.getDeclaredField("table");
                    Method remove = c.getDeclaredMethod("remove", ThreadLocal.class);
                    tableField.setAccessible(true);
                    c = Class.forName("java.lang.ThreadLocal$ThreadLocalMap$Entry");
                    Field value = c.getDeclaredField("value");
                    value.setAccessible(true);
                    Thread t = entry.getKey().get();                                
                    Object threadLocals = threadLocalsField.get(t);
                    WeakReference<ThreadLocal>[] table = (WeakReference[]) tableField.get(threadLocals);
                    int len = table.length;
                    for (int j = 0; j < len; j++) {
                        WeakReference<ThreadLocal> e = table[j];
                        if (e != null) {
                            remove.invoke(threadLocalsField, e.get());
                            System.out.println("Removed " + value.get(e));
                        }
                    }
                } catch(NoSuchFieldException e) {
                    e.printStackTrace();
                } catch(ClassNotFoundException e) {
                    e.printStackTrace();
                } catch(IllegalAccessException e) {
                    e.printStackTrace();
                } catch(NoSuchMethodException e) {
                    e.printStackTrace();
                } catch(InvocationTargetException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    // Todo : take care of Deployer when unloading...
    public void stop(Logger logger)
    {
        if (getDeployer()!=null) {
            Inhabitant i = registry.habitat.getInhabitantByType(getDeployer().getClass());
            if (i!=null) {
                i.release();
            }
        }
        if (getContainer()!=null) {
            Inhabitant i = registry.habitat.getInhabitantByType(getContainer().getClass());
            if (i!=null) {
                i.release();
            }
        }
        registry.removeContainer(this);
        if (logger.isLoggable(Level.FINE)) {
            logger.fine("Container " + getContainer().getName() + " stopped");
        }
    }    
}