/*
* Copyright 2002-2008 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.IOException;
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</a>.
*
* <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 {
try {
inputStream.close();
}
catch (IOException ex) {
}
try {
outputStream.close();
}
catch (IOException ex) {
}
resetThreadContextClassLoader(originalClassLoader);
}
}
}