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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 1997-2007 Sun Microsystems, Inc. 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.html
 * or glassfish/bootstrap/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 glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
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 *
 * 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
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 */

package com.sun.enterprise.resource.pool;

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.*;

/**
 * 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(String poolName) throws PoolingException {
        super(poolName);

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

    @Override
    protected synchronized void initPool(ResourceSpec resourceSpec,
            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--;
    }
}