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Glassfish example source code file (ConnectorXAResource.java)

This example Glassfish source code file (ConnectorXAResource.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

connectorxaresource, exception, exception, hashtable, javaeetransaction, localtxconnectioneventlistener, log, logging, managedconnection, managedconnection, resourcehandle, resourcehandle, resourcespec, transaction, util, xaexception, xaexception, xid

The Glassfish ConnectorXAResource.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * 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:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * 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 com.sun.enterprise.resource;

import javax.resource.ResourceException;
import javax.transaction.xa.*;
import javax.resource.spi.*;
import javax.transaction.SystemException;

import org.glassfish.resource.common.PoolInfo;
import com.sun.enterprise.transaction.api.JavaEETransactionManager;
import com.sun.enterprise.transaction.api.JavaEETransaction;
import com.sun.enterprise.transaction.api.TransactionConstants;
import com.sun.enterprise.connectors.ConnectorRuntime;
import com.sun.enterprise.resource.allocator.ResourceAllocator;
import com.sun.appserv.connectors.internal.api.PoolingException;
import com.sun.enterprise.resource.pool.PoolManager;
import com.sun.enterprise.resource.listener.ConnectionEventListener;
import com.sun.enterprise.resource.listener.LocalTxConnectionEventListener;

import java.util.logging.Logger;
import java.util.logging.Level;
import java.util.Hashtable;
import java.util.Set;
import java.util.Map;

import com.sun.logging.LogDomains;

/**
 * @author Tony Ng, Jagadish Ramu
 *
 */
public class ConnectorXAResource implements XAResource {

    private Object userHandle;
    private ResourceSpec spec;
    private PoolInfo poolInfo;
    private ResourceAllocator alloc;
    private PoolManager poolMgr;
    private ManagedConnection localConnection;
    private ClientSecurityInfo info;
    private ConnectionEventListener listener;
    private ResourceHandle localHandle_;
    private JavaEETransaction associatedTransaction;

    private static Hashtable listenerTable = new Hashtable();


    // Create logger object per Java SDK 1.4 to log messages
    // introduced Santanu De, Sun Microsystems, March 2002

    static Logger _logger = LogDomains.getLogger(ConnectorXAResource.class, LogDomains.RSR_LOGGER);

    public ConnectorXAResource(ResourceHandle handle,
                               ResourceSpec spec,
                               com.sun.enterprise.resource.allocator.ResourceAllocator alloc,
                               ClientSecurityInfo info ) {

        // initially userHandle is associated with mc
        this.poolMgr = ConnectorRuntime.getRuntime().getPoolManager();
        this.userHandle = null;
        this.spec = spec;
	    this.poolInfo = spec.getPoolInfo();
        this.alloc = alloc;
        this.info = info;
        localConnection = (ManagedConnection) handle.getResource();
        localHandle_ = handle;
    }

    public void setUserHandle(Object userHandle) {
        this.userHandle = userHandle;
    }

    private void handleResourceException(Exception ex)
        throws XAException {
        _logger.log(Level.SEVERE,"poolmgr.system_exception",ex);
        XAException xae = new XAException(ex.toString());
        xae.errorCode = XAException.XAER_RMERR;
        throw xae;
    }

    public void commit(Xid xid, boolean onePhase) throws XAException {
        try {
            ResourceHandle handle = getResourceHandle();
            ManagedConnection mc = (ManagedConnection) handle.getResource();
            mc.getLocalTransaction().commit();
        } catch (Exception ex) {
            handleResourceException(ex);
        }finally{
            resetAssociation();
            resetAssociatedTransaction();
        }
    }


    public void start(Xid xid, int flags) throws XAException {
        try {
            ResourceHandle handle = getResourceHandle();
            if (!localHandle_.equals(handle)) {
                ManagedConnection mc = (ManagedConnection) handle.getResource();
                mc.associateConnection(userHandle);
                LocalTxConnectionEventListener l =
                        (com.sun.enterprise.resource.listener.LocalTxConnectionEventListener) handle.getListener();
                if(_logger.isLoggable(Level.FINE)){
                    _logger.log(Level.FINE, "connection_sharing_start",  userHandle);
                }
                l.associateHandle(userHandle, localHandle_);
            } else{
                 associatedTransaction = getCurrentTransaction();
            }
        } catch (Exception ex) {
            handleResourceException(ex);
        }
    }

    public void end(Xid xid, int flags) throws XAException {
        if (_logger.isLoggable(Level.FINE)) {
            _logger.log(Level.FINE, "connection_sharing_end");
        }
        try {
            ResourceHandle handleInTransaction = getResourceHandle();
            if (!localHandle_.equals(handleInTransaction)) {
                LocalTxConnectionEventListener l = (LocalTxConnectionEventListener) handleInTransaction.getListener();

                ResourceHandle handle = l.removeAssociation(userHandle);
                if (handle != null) { // not needed, just to be sure.
                    ManagedConnection associatedConnection = (ManagedConnection) handle.getResource();
                    associatedConnection.associateConnection(userHandle);
                    if (_logger.isLoggable(Level.FINE)) {
                        _logger.log(Level.FINE, "connection_sharing_reset_association",
                                userHandle);
                    }
                }
            }
        } catch (Exception e) {
            handleResourceException(e);
        }
    }
    
    public void forget(Xid xid) throws XAException {
        if(_logger.isLoggable(Level.FINE)) {
	    _logger.fine("Well, forget is called for xid :"+xid);
        }
        // no-op
    }

    public int getTransactionTimeout() throws XAException {
        return 0;
    }
    
    public boolean isSameRM(XAResource other) throws XAException {
        if (this == other) return true;
        if (other == null) return false;
        if (other instanceof ConnectorXAResource) {
            ConnectorXAResource obj = (ConnectorXAResource) other;
            return (this.spec.equals(obj.spec) &&
                    this.info.equals(obj.info));
        } else {
            return false;
        }
    }        

    public int prepare(Xid xid) throws XAException {
        return TransactionConstants.LAO_PREPARE_OK;
    }
    
    public Xid[] recover(int flag) throws XAException {
        return new Xid[0];
    }
    
    public void rollback(Xid xid) throws XAException {
        try {
	    ResourceHandle handle = getResourceHandle();
	    ManagedConnection mc = (ManagedConnection) handle.getResource();
            mc.getLocalTransaction().rollback();
        } catch (Exception ex) {
            handleResourceException(ex);
        }finally{
            resetAssociation();
            resetAssociatedTransaction();
        }
    }

    public boolean setTransactionTimeout(int seconds) throws XAException {
        return false;
    }

    public static void freeListener(ManagedConnection mc) {
        listenerTable.remove(mc);
    }

    private ResourceHandle getResourceHandle() throws PoolingException {
        try {
            ResourceHandle h = null;
            JavaEETransaction j2eetran = getCurrentTransaction();
            if (j2eetran == null) {      //Only if some thing is wrong with tx manager.
                h = localHandle_;        //Just return the local handle.
            } else {
                h = (ResourceHandle)j2eetran.getNonXAResource();
            //make sure that if local-tx resource is set as 'unshareable', only one resource
            //can be acquired. If the resource in question is not the one in transaction, fail
            if(!localHandle_.isShareable()){
                   if(h != localHandle_){
                        throw new ResourceAllocationException("Cannot use more than one local-tx resource in unshareable scope");
                    }
                }
            }
            if (h.getResourceState().isUnenlisted()) {
                ManagedConnection mc = (ManagedConnection) h.getResource();
                // begin the local transaction if first time
                // this ManagedConnection is used in this JTA transaction
                mc.getLocalTransaction().begin();
            }
            return h;
        } catch (Exception ex) {
            _logger.log(Level.SEVERE, "poolmgr.system_exception", ex);
            throw new PoolingException(ex.toString(), ex);
        }
    }

    private JavaEETransaction getCurrentTransaction() throws SystemException {
         JavaEETransactionManager txMgr = ConnectorRuntime.getRuntime().getTransactionManager();
         return (JavaEETransaction) txMgr.getTransaction();
    }

    private void resetAssociation() throws XAException{
        try {
        ResourceHandle handle = getResourceHandle();

            LocalTxConnectionEventListener l = (LocalTxConnectionEventListener)handle.getListener();
            //Get all associated Handles and reset their ManagedConnection association.
            Map associatedHandles = l.getAssociatedHandles();
            if(associatedHandles != null ){
                Set<Map.Entry> userHandles = associatedHandles.entrySet();
                for(Map.Entry userHandleEntry : userHandles ){
                    ResourceHandle associatedHandle = (ResourceHandle)userHandleEntry.getValue();
                    ManagedConnection associatedConnection = (ManagedConnection)associatedHandle.getResource();
                    associatedConnection.associateConnection(userHandleEntry.getKey());
                    if(_logger.isLoggable(Level.FINE)){
                        _logger.log(Level.FINE, "connection_sharing_reset_association",
                                userHandleEntry.getKey());
                    }
                }
                //all associated handles are mapped back to their actual Managed Connection. Clear the associations.
                associatedHandles.clear();
            }

        } catch (Exception ex) {
            handleResourceException(ex);
        }
    }
   
    public JavaEETransaction getAssociatedTransaction(){
         return associatedTransaction;
    }

    private void resetAssociatedTransaction(){
         associatedTransaction = null;
    }
}

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