org.sakaiproject.genericdao.springutil.CurrentClassLoaderTxProxyFactoryBean.java Source code

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Here is the source code for org.sakaiproject.genericdao.springutil.CurrentClassLoaderTxProxyFactoryBean.java

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/**
 * $Id$
 * $URL$
 * CurrentClassLoaderTxProxyFactoryBean.java - genericdao - May 3, 2008 7:22:39 PM - azeckoski
 **************************************************************************
 * Copyright (c) 2008 Aaron Zeckoski
 * Licensed under the Apache License, Version 2
 * 
 * A copy of the Apache License, Version 2 has been included in this 
 * distribution and is available at: http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 * Aaron Zeckoski (azeckoski@gmail.com) (aaronz@vt.edu) (aaron@caret.cam.ac.uk)
 */

package org.sakaiproject.genericdao.springutil;

import org.springframework.transaction.interceptor.TransactionProxyFactoryBean;

/**
 * This sets the {@link ClassLoader} for the {@link TransactionProxyFactoryBean} to the current
 * one that this class exists in<br/>
 * Compatible with Spring 1.2.8+
 * 
 * @author Aaron Zeckoski (azeckoski@gmail.com)
 */
public class CurrentClassLoaderTxProxyFactoryBean extends TransactionProxyFactoryBean {
    private static final long serialVersionUID = 1L;

    protected transient ClassLoader myClassLoader = CurrentClassLoaderTxProxyFactoryBean.class.getClassLoader();

    protected boolean spring12x = false;
    protected boolean spring20x = false;

    public CurrentClassLoaderTxProxyFactoryBean() {
        try {
            // only works with Spring 2.5.x - from Zach Thomas
            super.setProxyClassLoader(myClassLoader);
        } catch (NoSuchMethodError e) {
            System.out.println(
                    "Warning: Spring 2.5.x method (setProxyClassLoader) not found, falling back to spring 2.0.x method");
            // try the spring 2.0.x version now
            try {
                spring20x = true;
                setBeanClassLoader(myClassLoader);
            } catch (NoSuchMethodError e1) {
                System.out.println(
                        "Warning: Spring 2.0.x method (setBeanClassLoader) not found, falling back to spring 1.2.x method");
                spring12x = true;
            }
        }
    }

    /*** only works with Spring 2.0.x **/
    @Override
    public void setBeanClassLoader(ClassLoader classLoader) {
        if (spring20x) {
            // this is basically ignoring the input classLoader and setting it to the one
            // which this class is currently part of
            super.setBeanClassLoader(myClassLoader);
        } else {
            super.setBeanClassLoader(classLoader);
        }
    }

    // needed to make this work with spring 1.2.8
    //   @Override
    //   protected Object getProxy(AopProxy aopProxy) {
    //       if (spring12x) {
    //           return aopProxy.getProxy(myClassLoader);
    //       } else {
    //           return super.getProxy(aopProxy);
    //       }
    //   }

}