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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC 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.openqa.grid.web.servlet;

import org.openqa.grid.common.exception.GridException;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * API to manage grid lifecycle
 */
public class LifecycleServlet extends HttpServlet {

  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    process(request, response);
  }

  protected void process(HttpServletRequest request, HttpServletResponse response)
      throws IOException {
    response.setContentType("text/html");
    response.setCharacterEncoding("UTF-8");
    response.setStatus(200);
    String action = request.getParameter("action");
    if ("shutdown".equals(action)) {
      Runnable initiateShutDown = new Runnable() {
        public void run() {
          try {
            Thread.sleep(500);
          } catch (InterruptedException e) {
            throw new RuntimeException(e);
          }
          System.exit(0);
        }
      };
      Thread isd = new Thread(initiateShutDown);
      isd.setName("initiateShutDown");
      isd.start();
    } else {
      throw new GridException("Unknown lifecycle action: " + action);
    }
    response.getWriter().close();
  }
}