001/*
002 * Copyright 2002-2018 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.remoting.caucho;
018
019import java.io.IOException;
020
021import javax.servlet.ServletException;
022import javax.servlet.http.HttpServletRequest;
023import javax.servlet.http.HttpServletResponse;
024
025import org.springframework.web.HttpRequestHandler;
026import org.springframework.web.HttpRequestMethodNotSupportedException;
027import org.springframework.web.util.NestedServletException;
028
029/**
030 * Servlet-API-based HTTP request handler that exports the specified service bean
031 * as Hessian service endpoint, accessible via a Hessian proxy.
032 *
033 * <p>Hessian is a slim, binary RPC protocol.
034 * For information on Hessian, see the
035 * <a href="http://hessian.caucho.com">Hessian website</a>.
036 * <b>Note: As of Spring 4.0, this exporter requires Hessian 4.0 or above.</b>
037 *
038 * <p>Hessian services exported with this class can be accessed by
039 * any Hessian client, as there isn't any special handling involved.
040 *
041 * @author Juergen Hoeller
042 * @since 13.05.2003
043 * @see HessianClientInterceptor
044 * @see HessianProxyFactoryBean
045 * @see org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter
046 * @see org.springframework.remoting.rmi.RmiServiceExporter
047 */
048public class HessianServiceExporter extends HessianExporter implements HttpRequestHandler {
049
050        /**
051         * Processes the incoming Hessian request and creates a Hessian response.
052         */
053        @Override
054        public void handleRequest(HttpServletRequest request, HttpServletResponse response)
055                        throws ServletException, IOException {
056
057                if (!"POST".equals(request.getMethod())) {
058                        throw new HttpRequestMethodNotSupportedException(request.getMethod(),
059                                        new String[] {"POST"}, "HessianServiceExporter only supports POST requests");
060                }
061
062                response.setContentType(CONTENT_TYPE_HESSIAN);
063                try {
064                        invoke(request.getInputStream(), response.getOutputStream());
065                }
066                catch (Throwable ex) {
067                        throw new NestedServletException("Hessian skeleton invocation failed", ex);
068                }
069        }
070
071}