/**
* Copyright 2015 Google Inc. All Rights Reserved.
*
* 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 com.google.apphosting.tests.usercode.testservlets;
import com.google.appengine.api.backends.BackendService;
import com.google.appengine.api.backends.BackendServiceFactory;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet that prints out information from the Backends API
*
* If no parameters are specified the servlet will print out
* <current_instance>.<current_server>
*
* If parameter "server" is specified the host:port for that server is printed
* out.
*
* If both "server" and "instance" is specified the host:port for that instance
* is printed out.
*
*
*/
public class BackendsApiServlet extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse res) throws IOException {
BackendService backends = BackendServiceFactory.getBackendService();
String server = req.getParameter("server");
PrintWriter writer = res.getWriter();
if (server == null) {
String currentServerName = backends.getCurrentBackend();
if (currentServerName == null) {
currentServerName = "<default>";
}
int currentInstance = backends.getCurrentInstance();
writer.append(currentInstance + "." + currentServerName + "\n");
} else {
String instance = req.getParameter("instance");
if (instance != null) {
writer.append(backends.getBackendAddress(server, Integer.parseInt(instance)) + "\n");
} else {
writer.append(backends.getBackendAddress(server) + "\n");
}
}
}
}