Spring Framework example source code file (BurlapExporter.java)

This example Spring Framework source code file (BurlapExporter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Spring Framework tags/keywords

beaninitializationexception, burlap, burlap, burlapexporter, burlapskeleton, burlapskeleton, class, classloader, constructor, constructor, initializingbean, io, object, object, reflection, remoteexporter

The Spring Framework BurlapExporter.java source code

/*
 * Copyright 2002-2007 the original author or authors.
 *
 * 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.springframework.remoting.caucho;

import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Constructor;

import com.caucho.burlap.io.BurlapInput;
import com.caucho.burlap.io.BurlapOutput;
import com.caucho.burlap.server.BurlapSkeleton;

import org.springframework.beans.factory.BeanInitializationException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.remoting.support.RemoteExporter;
import org.springframework.util.Assert;

/**
 * General stream-based protocol exporter for a Burlap endpoint.
 *
 * <p>Burlap is a slim, XML-based RPC protocol.
 * For information on Burlap, see the
 * <a href="http://www.caucho.com/burlap">Burlap website.
 *
 * <p>This exporter will work with both Burlap 2.x and 3.x (respectively
 * Resin 2.x and 3.x), autodetecting the corresponding skeleton class.
 *
 * @author Juergen Hoeller
 * @since 2.5.1
 * @see #invoke(java.io.InputStream, java.io.OutputStream)
 * @see BurlapServiceExporter
 * @see SimpleBurlapServiceExporter
 */
public class BurlapExporter extends RemoteExporter implements InitializingBean {

	private BurlapSkeleton skeleton;


	public void afterPropertiesSet() {
		prepare();
	}

	/**
	 * Initialize this service exporter.
	 */
	public void prepare() {
		try {
			try {
				// Try Burlap 3.x (with service interface argument).
				Constructor ctor = BurlapSkeleton.class.getConstructor(new Class[] {Object.class, Class.class});
				checkService();
				checkServiceInterface();
				this.skeleton = (BurlapSkeleton)
						ctor.newInstance(new Object[] {getProxyForService(), getServiceInterface()});
			}
			catch (NoSuchMethodException ex) {
				// Fall back to Burlap 2.x (without service interface argument).
				Constructor ctor = BurlapSkeleton.class.getConstructor(new Class[] {Object.class});
				this.skeleton = (BurlapSkeleton) ctor.newInstance(new Object[] {getProxyForService()});
			}
		}
		catch (Exception ex) {
			throw new BeanInitializationException("Burlap skeleton initialization failed", ex);
		}
	}


	/**
	 * Perform an invocation on the exported object.
	 * @param inputStream the request stream
	 * @param outputStream the response stream
	 * @throws Throwable if invocation failed
	 */
	public void invoke(InputStream inputStream, OutputStream outputStream) throws Throwable {
		Assert.notNull(this.skeleton, "Burlap exporter has not been initialized");
		ClassLoader originalClassLoader = overrideThreadContextClassLoader();
		try {
			this.skeleton.invoke(new BurlapInput(inputStream), new BurlapOutput(outputStream));
		}
		finally {
			resetThreadContextClassLoader(originalClassLoader);
		}
	}

}