genericpoolmanager.java

Java Database connection pool

/*
 *  PoolMan Java Object Pooling and Caching Library
 *  Copyright (C) 1999-2001 The Code Studio
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  The full license is located at the root of this distribution
 *  in the LICENSE file.
 */
package com.codestudio.util;

import com.codestudio.PoolManConstants;

import java.util.Enumeration;

/**
 * An extension of PoolManager that transforms it into a singleton.
 */
public class GenericPoolManager extends PoolManager {

    private String configFile = PoolManConstants.XML_CONFIG_FILE;

    private static GenericPoolManager myself = new GenericPoolManager();


    public static GenericPoolManager getInstance() {
        return myself;
    }

    private void assertLoaded() {
        if (this.pools.size() < 1) {
            try {
                synchronized (GenericPoolManager.class) {
                    if (this.pools.size() < 1)
                        new com.codestudio.management.PoolManBootstrap(this.configFile);
                }
            } catch (Exception e) {
                throw new RuntimeException("Fatal Error while attempting " + " to Configure PoolMan: " + e.getMessage() + " " + e.toString());
            }
        }
    }

    public GenericPool createPool(PoolMetaData metad) {
        GenericPool gpool = new GenericPool(metad);
        addPool(metad.getName(), gpool);
        return gpool;
    }


    /**
     * Overridden implementation ensures the config is loaded.
     */
    public ObjectPool getPool(String name) {
        assertLoaded();
        return super.getPool(name);
    }

    /**
     * Overridden implementation ensures the config is loaded.
     */
    public Enumeration getAllPoolnames() {
        assertLoaded();
        return super.getAllPoolnames();
    }

    public Object requestObject() {
        assertLoaded();
        return super.requestObject();
    }

    public Object requestObject(String poolName) {
        assertLoaded();
        return super.requestObject(poolName);
    }

}