Glassfish example source code file (UnpooledResource.java)

This example Glassfish source code file (UnpooledResource.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

hashtable, illegalstateexception, in-use, override, override, poolingexception, poolingexception, resourceallocator, resourcehandle, resourcehandle, resourcestate, transaction, transaction, unpooledresource, unpooledresource, util

The Glassfish UnpooledResource.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.pool;

import org.glassfish.resource.common.PoolInfo;
import com.sun.appserv.connectors.internal.api.PoolingException;
import com.sun.enterprise.resource.allocator.ResourceAllocator;
import com.sun.enterprise.resource.ResourceSpec;
import com.sun.enterprise.resource.ResourceState;
import com.sun.enterprise.resource.ResourceHandle;

import javax.transaction.*;
import java.util.Hashtable;

/**
 * This resource pool is created when connection pooling is switched off
 * Hence no pooling happens in this resource pool
 *
 * @author Kshitiz Saxena
 * @since 9.1
 */
public class UnpooledResource extends ConnectionPool{

    private int poolSize;

    /** Creates a new instance of UnpooledResourcePool */
    public UnpooledResource(PoolInfo poolInfo, Hashtable env) throws PoolingException {
        super(poolInfo, env);

        //No pool is being maintained, hence no pool cleanup is needed
        //in case of failure
        failAllConnections = false;
    }

    @Override
    protected synchronized void initPool(ResourceAllocator allocator)
            throws PoolingException{

        if (poolInitialized) {
            return;
        }

        //nothing needs to be done as pooling is disabled
        poolSize = 0;

        poolInitialized = true;
    }

    @Override
    protected ResourceHandle prefetch(ResourceSpec spec, ResourceAllocator alloc,
            Transaction tran) {
        return null;
    }

    @Override
    protected ResourceHandle getUnenlistedResource(ResourceSpec spec, ResourceAllocator alloc,
            Transaction tran) throws PoolingException {
        ResourceHandle handle = null;

        if(incrementPoolSize()){
            try{
                handle = createSingleResource(alloc);
            }catch (PoolingException ex){
                decrementPoolSize();
                throw ex;
            }
            ResourceState state = new ResourceState();
            handle.setResourceState(state);
            state.setEnlisted(false);
            setResourceStateToBusy(handle);
            return handle;
        }
        _logger.info("Fail as poolSize : " + poolSize);
        String msg = localStrings.getStringWithDefault(
                "poolmgr.max.pool.size.reached",
                "In-use connections equal max-pool-size therefore cannot allocate any more connections.");
        throw new PoolingException(msg);
    }

    @Override
    public void resourceErrorOccurred(ResourceHandle resourceHandle) throws IllegalStateException {
        freeResource(resourceHandle);
    }

    @Override
    protected void freeResource(ResourceHandle resourceHandle){
        decrementPoolSize();
        deleteResource(resourceHandle);
    }

    private synchronized boolean incrementPoolSize(){
        if(poolSize >= maxPoolSize)
            return false;
        poolSize++;
        return true;
    }

    private synchronized void decrementPoolSize(){
        poolSize--;
    }
}