org.springframework.remoting.caucho.BurlapServiceExporter Maven / Gradle / Ivy
/*
* 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.IOException;
import java.lang.reflect.Constructor;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
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;
import org.springframework.web.HttpRequestHandler;
import org.springframework.web.HttpRequestMethodNotSupportedException;
import org.springframework.web.util.NestedServletException;
/**
* HTTP request handler that exports the specified service bean as
* Burlap service endpoint, accessible via a Burlap proxy.
*
* Burlap is a slim, XML-based RPC protocol.
* For information on Burlap, see the
* Burlap website
*
*
This exporter will work with both Burlap 2.x and 3.x (respectively
* Resin 2.x and 3.x), autodetecting the corresponding skeleton class.
*
*
Note: Burlap services exported with this class can be accessed by
* any Burlap client, as there isn't any special handling involved.
*
* @author Juergen Hoeller
* @since 13.05.2003
* @see BurlapClientInterceptor
* @see BurlapProxyFactoryBean
* @see org.springframework.remoting.caucho.HessianServiceExporter
* @see org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter
* @see org.springframework.remoting.rmi.RmiServiceExporter
*/
public class BurlapServiceExporter extends RemoteExporter
implements HttpRequestHandler, 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);
}
}
/**
* Processes the incoming Burlap request and creates a Burlap response.
*/
public void handleRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Assert.notNull(this.skeleton, "BurlapServiceExporter has not been initialized");
if (!"POST".equals(request.getMethod())) {
throw new HttpRequestMethodNotSupportedException("POST",
"BurlapServiceExporter only supports POST requests");
}
BurlapInput in = new BurlapInput(request.getInputStream());
BurlapOutput out = new BurlapOutput(response.getOutputStream());
try {
this.skeleton.invoke(in, out);
}
catch (Throwable ex) {
throw new NestedServletException("Burlap skeleton invocation failed", ex);
}
}
}