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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.tuscany.sca.binding.http.provider;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLDecoder;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.invocation.MessageFactory;
/**
* Servlet responsible for dispatching HTTP GET requests to the
* target component implementation.
*
* @version $Rev$ $Date$
*/
public class HTTPGetListenerServlet extends HttpServlet {
private static final long serialVersionUID = 2865466417329430610L;
private MessageFactory messageFactory;
private Invoker getInvoker;
/**
* Constructs a new HTTPServiceListenerServlet.
*/
public HTTPGetListenerServlet(Invoker getInvoker, MessageFactory messageFactory) {
this.getInvoker = getInvoker;
this.messageFactory = messageFactory;
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// Get the request path
String path = URLDecoder.decode(request.getRequestURI().substring(request.getServletPath().length()), "UTF-8");
if (path.length() ==0) {
// Redirect to a URL ending with / to make relative hrefs work
// relative to the served resource.
response.sendRedirect(request.getRequestURL().append('/').toString());
return;
}
// Invoke the get operation on the service implementation
Message requestMessage = messageFactory.createMessage();
String id = path.substring(1);
requestMessage.setBody(new Object[] {id});
Message responseMessage = getInvoker.invoke(requestMessage);
if (responseMessage.isFault()) {
throw new ServletException((Throwable)responseMessage.getBody());
}
// Write the response from the service implementation to the response
// output stream
InputStream is = (InputStream)responseMessage.getBody();
OutputStream os = response.getOutputStream();
byte[] buffer = new byte[2048];
for (;;) {
int n = is.read(buffer);
if (n <= 0)
break;
os.write(buffer, 0, n);
}
os.flush();
os.close();
}
}
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