org.springframework.remoting.caucho.HessianServiceExporter Maven / Gradle / Ivy
/*
* Copyright 2002-2004 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.lang.reflect.Constructor;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.caucho.hessian.io.HessianInput;
import com.caucho.hessian.io.HessianOutput;
import com.caucho.hessian.server.HessianSkeleton;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.remoting.support.RemoteExporter;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import org.springframework.web.servlet.support.WebContentGenerator;
/**
* Web controller that exports the specified service bean as Hessian service
* endpoint, accessible via a Hessian proxy.
*
* Hessian is a slim, binary RPC protocol.
* For information on Hessian, see the
* Hessian website
*
*
This exporter will work with both Hessian 2.x and 3.x (respectively
* Resin 2.x and 3.x), auto-detecting the corresponding skeleton class.
*
*
Note: Hessian services exported with this class can be accessed by
* any Hessian client, as there isn't any special handling involved.
*
* @author Juergen Hoeller
* @since 13.05.2003
* @see HessianClientInterceptor
* @see HessianProxyFactoryBean
* @see org.springframework.remoting.caucho.BurlapServiceExporter
* @see org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter
* @see org.springframework.remoting.rmi.RmiServiceExporter
*/
public class HessianServiceExporter extends RemoteExporter implements Controller, InitializingBean {
private HessianSkeleton skeleton;
public void afterPropertiesSet() throws Exception {
try {
// Try Hessian 3.x (with service interface argument).
Constructor ctor = HessianSkeleton.class.getConstructor(new Class[] {Object.class, Class.class});
checkService();
checkServiceInterface();
this.skeleton = (HessianSkeleton) ctor.newInstance(new Object[] {getService(), getServiceInterface()});
}
catch (NoSuchMethodException ex) {
// Fall back to Hessian 2.x (without service interface argument).
Constructor ctor = HessianSkeleton.class.getConstructor(new Class[] {Object.class});
this.skeleton = (HessianSkeleton) ctor.newInstance(new Object[] {getProxyForService()});
}
}
/**
* Process the incoming Hessian request and create a Hessian response.
*/
public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
if (!WebContentGenerator.METHOD_POST.equals(request.getMethod())) {
throw new ServletException("HessianServiceExporter only supports POST requests");
}
HessianInput in = new HessianInput(request.getInputStream());
HessianOutput out = new HessianOutput(response.getOutputStream());
try {
this.skeleton.invoke(in, out);
return null;
}
catch (Exception ex) {
throw ex;
}
catch (Error ex) {
throw ex;
}
catch (Throwable ex) {
// Should never happen: There are no Throwables other than Exceptions and Errors.
throw new ServletException(ex);
}
}
}