Glassfish example source code file (OSGiObjectInputOutputStreamFactoryImpl.java)

This example Glassfish source code file (OSGiObjectInputOutputStreamFactoryImpl.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

bundle, bundleevent, class, class, classnotfoundexception, io, ioexception, ioexception, log, logging, long, object, osgiobjectinputstream, override, override, string, string, threading, threads

The Glassfish OSGiObjectInputOutputStreamFactoryImpl.java source code

/*
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 *
 * 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
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package com.sun.enterprise.naming.util;

import org.osgi.framework.BundleContext;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleEvent;
import org.osgi.framework.ServiceReference;
import org.osgi.service.packageadmin.PackageAdmin;
import org.osgi.util.tracker.BundleTracker;
import org.osgi.util.tracker.BundleTrackerCustomizer;

import java.io.InputStream;
import java.io.OutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.IOException;
import java.io.ObjectStreamClass;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * @author Sanjeeb.Sahoo@Sun.COM
 */
public class OSGiObjectInputOutputStreamFactoryImpl
        implements ObjectInputOutputStreamFactory
{
    private BundleContext ctx;
    PackageAdmin pkgAdm;

    static Logger _logger = LogFacade.getLogger();

    private ConcurrentHashMap<String, Long> name2Id = new ConcurrentHashMap();

    // Since bundle id starts with 0, we use -1 to indicate a non-bundle
    private static final long NOT_A_BUNDLE_ID = -1;
    private static final String NOT_A_BUNDLE_KEY = ":";

    public OSGiObjectInputOutputStreamFactoryImpl(BundleContext ctx)
    {
        this.ctx = ctx;
        ServiceReference ref = ctx.getServiceReference(PackageAdmin.class.getName());
        pkgAdm = PackageAdmin.class.cast(ctx.getService(ref));

        BundleTracker bt = new BundleTracker(ctx, Bundle.INSTALLED | Bundle.RESOLVED | Bundle.STARTING | Bundle.ACTIVE, new BundleTrackerCustomizer() {
            
            @Override
            public void modifiedBundle(Bundle bundle, BundleEvent bundleEvent, Object o) {
            }

            @Override
            public Object addingBundle(Bundle bundle, BundleEvent bundleEvent) {
                String key = makeKey(bundle);
                name2Id.put(key, bundle.getBundleId());
                if (_logger.isLoggable(Level.FINE)) {
                    _logger.log(Level.FINE, "BundleTracker.addingBundle BUNDLE " + key + " ==> " + bundle.getBundleId() + "  for " + bundle.getSymbolicName());
                }
                return null;
            }

            @Override
            public void removedBundle(Bundle bundle, BundleEvent bundleEvent, Object o) {
                String key = makeKey(bundle);
                Long bundleID = name2Id.remove(key);
                if (_logger.isLoggable(Level.FINE)) {
                    _logger.log(Level.FINE, "BundleTracker.removedBundle BUNDLE " + key + "  ==> " + bundle.getSymbolicName());
                }
                if (bundleID == null) {
                    _logger.log(Level.WARNING, "BundleTracker.removedBundle null bundleID for ==> " + key);
                }
            }
            /*
            @Override
            public Object addingBundle(Bundle bundle, BundleEvent event) {
                System.out.println("ADDING BUNDLE ==> " + bundle.getSymbolicName());
                return super.addingBundle(bundle, event);    //To change body of overridden methods use File | Settings | File Templates.
            }

            @Override
            public void removedBundle(Bundle bundle, BundleEvent event, Object object) {
                System.out.println("REMOVING BUNDLE ==> " + bundle.getSymbolicName());                
                super.removedBundle(bundle, event, object);    //To change body of overridden methods use File | Settings | File Templates.
            }
            */
        });

        bt.open();

    }

    private String makeKey(Bundle bundle) {
        return bundle.getSymbolicName() + ":" + bundle.getVersion();
    }

    public ObjectInputStream createObjectInputStream(InputStream in)
            throws IOException
    {
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        return new OSGiObjectInputStream(in, loader);
    }

    public ObjectOutputStream createObjectOutputStream(OutputStream out)
            throws IOException
    {
        return new OSGiObjectOutputStream(out);
    }

    private class OSGiObjectInputStream extends ObjectInputStreamWithLoader
    {

        public OSGiObjectInputStream(InputStream in, ClassLoader loader) throws IOException
        {
            super(in, loader);
        }

        @Override
        protected Class<?> resolveClass(ObjectStreamClass desc)
                throws IOException, ClassNotFoundException
        {
            Class clazz =
                OSGiObjectInputOutputStreamFactoryImpl.this.resolveClass(this, desc);

            if (clazz == null) {
                clazz = super.resolveClass(desc);
            }

            return clazz;
        }

    }

    private class OSGiObjectOutputStream extends ObjectOutputStream {


        private OSGiObjectOutputStream(OutputStream out) throws IOException
        {
            super(out);
        }

        @Override
        protected void annotateClass(Class<?> cl) throws IOException
        {
            OSGiObjectInputOutputStreamFactoryImpl.this.annotateClass(this, cl);
        }
    }

    public Class<?> resolveClass(ObjectInputStream in, final ObjectStreamClass desc)
            throws IOException, ClassNotFoundException
    {
        String key = in.readUTF();

        if (! NOT_A_BUNDLE_KEY.equals(key)) {
            Long bundleId = name2Id.get(key);
            if (bundleId != null) {
                final Bundle b = ctx.getBundle(bundleId);

                if (System.getSecurityManager() == null) {
                    return b.loadClass(desc.getName());
                } else {
                    try {
                        return (Class) java.security.AccessController.doPrivileged(
                                new java.security.PrivilegedExceptionAction() {
                                    public java.lang.Object run() throws ClassNotFoundException {
                                        return b.loadClass(desc.getName());
                                    }
                                });
                    } catch (java.security.PrivilegedActionException pae) {
                        throw (ClassNotFoundException) pae.getException();
                    }
                }
            }
        }

        return null;
    }

    public void annotateClass(ObjectOutputStream out, Class<?> cl) throws IOException
    {
        String key = NOT_A_BUNDLE_KEY;
        Bundle b = pkgAdm.getBundle(cl);
        if (b != null) {
            key = makeKey(b);
        }
        out.writeUTF(key);
    }

}