p6datasourcefactory.java

一个跟踪调试jdbc的工具包。通过把jdbc做一个封装

/*
 *
 * ====================================================================
 *
 * The P6Spy Software License, Version 1.1
 *
 * This license is derived and fully compatible with the Apache Software
 * license, see http://www.apache.org/LICENSE.txt
 *
 * Copyright (c) 2001-2002 Andy Martin, Ph.D. and Jeff Goke
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in
 * the documentation and/or other materials provided with the
 * distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 * any, must include the following acknowlegement:
 * "The original concept and code base for P6Spy was conceived
 * and developed by Andy Martin, Ph.D. who generously contribued
 * the first complete release to the public under this license.
 * This product was due to the pioneering work of Andy
 * that began in December of 1995 developing applications that could
 * seamlessly be deployed with minimal effort but with dramatic results.
 * This code is maintained and extended by Jeff Goke and with the ideas
 * and contributions of other P6Spy contributors.
 * (http://www.p6spy.com)"
 * Alternately, this acknowlegement may appear in the software itself,
 * if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "P6Spy", "Jeff Goke", and "Andy Martin" must not be used
 * to endorse or promote products derived from this software without
 * prior written permission. For written permission, please contact
 * [e-mail].
 *
 * 5. Products derived from this software may not be called "P6Spy"
 * nor may "P6Spy" appear in their names without prior written
 * permission of Jeff Goke and Andy Martin.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/**
 * 
 * Data Source Factory implementation, required for Referenceable 
 * interface in P6DataSource class
 *
 * $Author: aarvesen $
 *
 * $Log: P6DataSourceFactory.java,v $
 * Revision 1.3  2003/06/03 16:07:12  aarvesen
 * renamed setDataSourceName to setRealDataSource to both fix a bug with the Oracle app server (which was calling setDataSourceName on its own) and to be orthogonal with spy.properties
 *
 * Revision 1.2  2003/01/30 23:38:49  dlukeparker
 *
 *
 * Added cvs keywords
 *
 * Revision 1.1  2003/01/30 23:35:22  dlukeparker
 *
 *
 * Added support for the javax.sql operations for pooled connections. This
 * is required for support of WebSphere.
 *
 * Finished implementation of com/p6spy/engine/spy/P6DataSource.java
 *
 * Added com/p6spy/engine/spy/P6ConnectionPoolDataSource.java
 * Added com/p6spy/engine/spy/P6DataSourceFactory.java
 * Added com/p6spy/engine/spy/P6PooledConnection.java
 * Added com/p6spy/engine/spy/P6ProxyConnection.java
 *
 * Made changes in spy.properties and com/p6spy/engine/common/P6SpyOptions.java
 * to enable datasource name, driver and properties setting. Also added support
 * for specifying the JNDI context for finding the real datasource.
 *
 *
*/

package com.p6spy.engine.spy;

import java.util.Hashtable;
import javax.naming.*;
import javax.naming.spi.ObjectFactory;

/**
 * Factory class for P6DataSource objects
 */

public class P6DataSourceFactory implements ObjectFactory {


    protected final String dataSourceClassName =
		"com.p6spy.engine.spy.P6DataSource";
    
    protected final String poolDataSourceName =
	"com.p6spy.engine.spy.P6ConnectionPoolDataSource";
    
    
    public Object getObjectInstance(Object refObj,
				    Name nm,
				    Context ctx,
				    Hashtable env) throws Exception {

	Reference ref = (Reference) refObj;
	
	String className = ref.getClassName();
	
	if (className != null && 
	    (className.equals(dataSourceClassName) ||
	     className.equals(poolDataSourceName))) {
	    
	    P6DataSource dataSource = null;
	    
	    try {
		dataSource = (P6DataSource)Class.forName(className).newInstance();
	    } catch (Exception ex) {
		throw new RuntimeException("Unable to create DataSource of " +
					   "class '" + className + "': " + ex.toString());
	    }
	    // name of the real datasource
	    dataSource.setRealDataSource((String) ref.get("dataSourceName").getContent());
	    
	    return dataSource;
	} else	{ 
	    // Who's class is this anyway, I ask ya!
	    return null;
	}
    }
}