org.gwtwidgets.server.spring.gilead.GileadRPCServiceExporter Maven / Gradle / Ivy

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*** THIS IS AN OBSOLETE VERSION UPLOADED FOR USE WITH CEDAR-COMMON.*** The Server Library for GWT is a collection of Java server side components for the Google Web Toolkit AJAX framework with the focus on the Spring framework by facilitating publishing of Spring beans as RPC services with support for Hibernate-managed entities.
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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.gwtwidgets.server.spring.gilead;

import java.lang.reflect.Method;

import net.sf.gilead.core.PersistentBeanManager;
import net.sf.gilead.core.hibernate.HibernateUtil;
import net.sf.gilead.gwt.GileadRPCHelper;
import net.sf.gilead.gwt.GwtConfigurationHelper;

import com.google.gwt.user.client.rpc.SerializationException;
import com.google.gwt.user.server.rpc.RPC;

import org.gwtwidgets.server.spring.GWTRPCServiceExporter;
import org.hibernate.SessionFactory;

import com.google.gwt.user.server.rpc.RPCRequest;

/**
 * Incorporates Hibernate4GWT's
 * HibernateBeanManager. The concept is similar to
 * HibernateRemoteService: RPC objects are merged into the current
 * Hibernate session and are detached on their way out. Instances must be
 * provided with a HibernateBeanManager.
 * 
 * @author George Georgovassilis, g.georgovassilis[at]gmail.com
 * 
 */
public class GileadRPCServiceExporter extends GWTRPCServiceExporter {

	// Used to store the old classloader for the duration of an invocation
	private ThreadLocal tmpClassloader;

	private boolean createSessionIfNotExists = true;

	private boolean usingProxyClassLoader = false;

	private SessionFactory sessionFactory;

	private PersistentBeanManager beanManager;

	public boolean isUsingProxyClassLoader() {
		return usingProxyClassLoader;
	}

	@Override
	public void afterPropertiesSet() throws Exception {
		if (sessionFactory == null && beanManager == null)
			throw new IllegalArgumentException(
					"You must provide either a SessionFactory or a PersistentBeanManager");
		if (usingProxyClassLoader)
			tmpClassloader = new ThreadLocal();
		if (beanManager == null)
			beanManager = GwtConfigurationHelper
					.initGwtStatelessBeanManager(new HibernateUtil(
							sessionFactory));
		super.afterPropertiesSet();
	}

	public SessionFactory getSessionFactory() {
		return sessionFactory;
	}

	public void setSessionFactory(SessionFactory sessionFactory) {
		this.sessionFactory = sessionFactory;
	}

	public PersistentBeanManager getBeanManager() {
		return beanManager;
	}

	public void setBeanManager(PersistentBeanManager beanManager) {
		this.beanManager = beanManager;
	}

	/**
	 * Specify whether to use Hibernate4GWT's ProxyClassloader (
	 * true) or the default class loader (false,
	 * default).
	 * 
	 * @param usingProxyClassLoader
	 */
	public void setUsingProxyClassLoader(boolean usingProxyClassLoader) {
		this.usingProxyClassLoader = usingProxyClassLoader;
	}

	/**
	 * Specify if a servlet session should be created if one does not already
	 * exists.
	 * 
	 * @param createSessionIfNotExists
	 *            Defaults to true
	 */
	public void setCreateSessionIfNotExists(boolean createSessionIfNotExists) {
		this.createSessionIfNotExists = createSessionIfNotExists;
	}

	@Override
	protected void onBeforeRequestDeserialized(String serializedRequest) {
		super.onBeforeRequestDeserialized(serializedRequest);
		if (isUsingProxyClassLoader()) {
			Thread currentThread = Thread.currentThread();
			// We are going to swap the class loader
			ClassLoader oldContextClassLoader = currentThread
					.getContextClassLoader();
			logger.debug("Classloader before invocation: "
					+ oldContextClassLoader);
			logger.debug("Replacing with classloader   : "
					+ getClass().getClassLoader());
			tmpClassloader.set(oldContextClassLoader);
			currentThread.setContextClassLoader(getClass().getClassLoader());

			GileadRPCHelper.initClassLoader();
			logger.debug("New classloader              : "
					+ getClass().getClassLoader());
		}
	}

	@Override
	protected void onAfterResponseSerialized(String serializedResponse) {
		super.onAfterResponseSerialized(serializedResponse);
		if (isUsingProxyClassLoader()) {
			Thread currentThread = Thread.currentThread();
			ClassLoader oldContextClassLoader = tmpClassloader.get();
			currentThread.setContextClassLoader(oldContextClassLoader);
			logger.debug("reinstating old classloader");
		}
	}

	@Override
	public String invokeMethodOnService(Object service, Method targetMethod,
			Object[] targetParameters, RPCRequest rpcRequest) throws Exception {

		checkPermutationStrongName();
		GileadRPCHelper.parseInputParameters(rpcRequest, beanManager,
				getThreadLocalRequest().getSession(createSessionIfNotExists));
		Object result = targetMethod.invoke(service, targetParameters);
		result = GileadRPCHelper.parseReturnValue(result, beanManager);
		String encodedResult = RPC.encodeResponseForSuccess(rpcRequest
				.getMethod(), result, rpcRequest.getSerializationPolicy());
		return encodedResult;
	}

	@Override
	protected String encodeResponseForFailure(Throwable cause)
			throws SerializationException {
		Throwable throwable = (Throwable) GileadRPCHelper.parseReturnValue(
				cause, beanManager);
		return super.encodeResponseForFailure(throwable);
	}

	@Override
	protected String encodeResponseForFailure(RPCRequest rpcRequest,
			Throwable cause) throws SerializationException {
		Throwable throwable = (Throwable)GileadRPCHelper.parseReturnValue(
				cause, beanManager);
		return super.encodeResponseForFailure(rpcRequest, throwable);
	}

}