Glassfish example source code file (DistributedReadOnlyBeanServiceImpl.java)

This example Glassfish source code file (DistributedReadOnlyBeanServiceImpl.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

bytearrayinputstream, classloader, classloader, distributedreadonlybeannotifier, distributedreadonlybeanservice, error, error, exception, io, log, logging, readonlybeanrefresheventhandler, readonlybeanrefresheventhandler, readonlybeanrefreshhandlerinfo, readonlybeanrefreshhandlerinfo, registered, serializable, threading, threads

The Glassfish DistributedReadOnlyBeanServiceImpl.java source code

/*
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 *
 * Copyright (c) 1997-2010 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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 * Version 2] license."  If you don't indicate a single choice of license, a
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 * and therefore, elected the GPL Version 2 license, then the option applies
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 */

package com.sun.ejb.spi.distributed;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Level;
import java.util.logging.Logger;

import com.sun.ejb.containers.EjbContainerUtilImpl;
import com.sun.logging.LogDomains;


class DistributedReadOnlyBeanServiceImpl
    implements DistributedReadOnlyBeanService {
    
	private Logger _logger = LogDomains.getLogger(DistributedReadOnlyBeanServiceImpl.class, LogDomains.EJB_LOGGER);
    
    private ConcurrentHashMap<Long, ReadOnlyBeanRefreshHandlerInfo> refreshHandlers
        = new ConcurrentHashMap<Long, ReadOnlyBeanRefreshHandlerInfo>();
    
    
    private DistributedReadOnlyBeanNotifier robNotifier;
    
    public void setDistributedReadOnlyBeanNotifier(
            DistributedReadOnlyBeanNotifier notifier) {
        this.robNotifier = notifier;
        _logger.log(Level.INFO, "Registered ReadOnlyBeanNotifier: "
                + notifier);
    }
    
    public void addReadOnlyBeanRefreshEventHandler(
            long ejbID, ClassLoader loader,
            ReadOnlyBeanRefreshEventHandler handler) {
        refreshHandlers.put(ejbID, new ReadOnlyBeanRefreshHandlerInfo(
                ejbID, loader, handler));
        _logger.log(Level.INFO, "Registered ReadOnlyBeanRefreshEventHandler: "
                + ejbID + "; " + handler);
    }

    public void removeReadOnlyBeanRefreshEventHandler(long ejbID) {
        refreshHandlers.remove(ejbID);
    }

    public void notifyRefresh(long ejbID, Object pk) {
        if (robNotifier != null) {
            byte[] pkData = null;
            
            ByteArrayOutputStream bos = null;
            ObjectOutputStream oos = null;
            try {
                bos = new ByteArrayOutputStream();
                oos = new ObjectOutputStream(bos);
                
                oos.writeObject(pk);
                oos.flush();
                bos.flush();
                pkData = bos.toByteArray();
                robNotifier.notifyRefresh(ejbID, pkData);
            } catch (Exception ex) {
                _logger.log(Level.WARNING, "Error during notifyRefresh", ex);
            } finally {
                if (oos != null) {
                    try { oos.close(); } catch(IOException ioEx) {};
                }
                if (bos != null) {
                    try { bos.close(); } catch(IOException ioEx) {};
                }
            }
        } else {
            if (_logger.isLoggable(Level.FINE)) {
                _logger.log(Level.FINE,
                        "DistributedReadOnlyBeanService ignoring request "
                        + "for notifyRefresh: " + ejbID);
            }
        }
    }

    public void notifyRefreshAll(long ejbID) {
        if (robNotifier != null) {
            robNotifier.notifyRefreshAll(ejbID);
        }  else {
            if (_logger.isLoggable(Level.FINE)) {
                _logger.log(Level.FINE,
                        "DistributedReadOnlyBeanService ignoring request "
                        + "for notifyRefreshAll: " + ejbID);
            }
        }
    }
    
    public void handleRefreshRequest(long ejbID, byte[] pkData) {
        refreshRequestReceived(false, ejbID, pkData);
    }
    
    public void handleRefreshAllRequest(long ejbID) {
        refreshRequestReceived(true, ejbID, null);
    }
    
    private void refreshRequestReceived(boolean refreshAll,
            long ejbID, byte[] pkData) {

        final ReadOnlyBeanRefreshHandlerInfo info = refreshHandlers.get(ejbID);
        if (info == null) {
            //TODO: Log something
            return;
        }
        
        final Thread currentThread = Thread.currentThread();
        final ClassLoader prevClassLoader = currentThread.getContextClassLoader();
        
        try {
            if(System.getSecurityManager() == null) {
                currentThread.setContextClassLoader(info.loader);
            } else {
                java.security.AccessController.doPrivileged(
                        new java.security.PrivilegedAction() {
                    public java.lang.Object run() {
                        currentThread.setContextClassLoader(info.loader);
                        return null;
                    }
                });
            }
            
            if (! refreshAll) {
                ByteArrayInputStream bis = null;
                ObjectInputStream ois = null;
                Serializable pk = null;
                try {
                    bis = new ByteArrayInputStream(pkData);
                    ois = new ObjectInputStream(bis);
                    
                    pk = (Serializable) ois.readObject();
                } catch (IOException ioEx) {
                    _logger.log(Level.WARNING, "Error during refresh", ioEx);
                } catch (ClassNotFoundException cnfEx) {
                    _logger.log(Level.WARNING, "Error during refresh", cnfEx);
                } finally {
                    if (ois != null) {
                        try {
                            ois.close();
                        } catch(IOException ioEx) {
                            _logger.log(Level.WARNING, 
                                    "Error while closing object stream", ioEx);
                        };
                    }
                    if (bis != null) {
                        try {
                            bis.close();
                        } catch(IOException ioEx) {
                            _logger.log(Level.WARNING, 
                                    "Error while closing byte stream", ioEx);
                        };
                    }
                }
                if (pk != null) {
                    info.handler.handleRefreshRequest(pk);
                }
            } else {
                info.handler.handleRefreshAllRequest();
            }
        } catch (Exception ex) {
            _logger.log(Level.WARNING, "Error during refresh", ex);
        } finally {
            if(System.getSecurityManager() == null) {
                currentThread.setContextClassLoader(prevClassLoader);
            } else {
                java.security.AccessController.doPrivileged(
                        new java.security.PrivilegedAction() {
                    public java.lang.Object run() {
                        currentThread.setContextClassLoader(prevClassLoader);
                        return null;
                    }
                });
            }
        }        
    }
    
    private static class ReadOnlyBeanRefreshHandlerInfo {
        public  long                            ejbId;
        public  ClassLoader                     loader;
        public  ReadOnlyBeanRefreshEventHandler handler;
        
        public ReadOnlyBeanRefreshHandlerInfo(long ejbId,
                ClassLoader loader, ReadOnlyBeanRefreshEventHandler handler) {
            this.ejbId = ejbId;
            this.loader = loader;
            this.handler = handler;
        }
    }
}