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 * 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
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 * file and include the License file at packager/legal/LICENSE.txt.
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package org.glassfish.osgijta;

import org.glassfish.osgijavaeebase.Extender;
import org.osgi.framework.BundleContext;

import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.transaction.TransactionManager;
import javax.transaction.TransactionSynchronizationRegistry;
import javax.transaction.UserTransaction;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

/**
 * @author [email protected]
 */
public class JTAExtender implements Extender {
    private final BundleContext ctx;

    public JTAExtender(BundleContext ctx) {
        this.ctx = ctx;
    }

    public void start() {
        Class[] classes = {UserTransaction.class, TransactionManager.class, TransactionSynchronizationRegistry.class};
        String[] jndiNames = {"UserTransaction", "java:appserver/TransactionManager", "java:appserver/TransactionSynchronizationRegistry"};
        for (int i = 0; i < 3; ++i) {
            registerProxy(classes[i], jndiNames[i]);
        }
    }

    private void registerProxy(Class clazz, String jndiName) {
        InvocationHandler ih = new MyInvocationHandler(clazz, jndiName);
        Object proxy = Proxy.newProxyInstance(getClass().getClassLoader(), new Class[]{clazz}, ih);
        ctx.registerService(clazz.getName(), proxy, null);
    }

    public void stop() {
    }

    private class MyInvocationHandler implements InvocationHandler {
        private Class clazz;
        private String jndiName;

        private MyInvocationHandler(Class clazz, String jndiName) {
            this.clazz = clazz;
            this.jndiName = jndiName;
        }

        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
            try {
                InitialContext ic = getInitialContext();
                Object target = ic.lookup(jndiName);
                try {
                    return method.invoke(target, args);
                } catch (InvocationTargetException e) {
                    // We need to unwrap the real exception and throw it
                    throw e.getCause();
                }
            } catch (NamingException e) {
                throw new RuntimeException("JTA Service is not available.", e);
            }
        }
    }

    private InitialContext getInitialContext() throws NamingException {
        return new InitialContext();
    }
}