001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.regionserver.http;
019
020import java.io.IOException;
021import javax.servlet.ServletException;
022import javax.servlet.http.HttpServlet;
023import javax.servlet.http.HttpServletRequest;
024import javax.servlet.http.HttpServletResponse;
025import org.apache.hadoop.hbase.regionserver.HRegionServer;
026import org.apache.hadoop.hbase.tmpl.regionserver.RSStatusTmpl;
027import org.apache.yetus.audience.InterfaceAudience;
028
029@InterfaceAudience.Private
030public class RSStatusServlet extends HttpServlet {
031  private static final long serialVersionUID = 1L;
032
033  @Override
034  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
035    throws ServletException, IOException {
036    HRegionServer hrs =
037      (HRegionServer) getServletContext().getAttribute(HRegionServer.REGIONSERVER);
038    assert hrs != null : "No RS in context!";
039
040    resp.setContentType("text/html");
041
042    if (!hrs.isOnline()) {
043      resp.getWriter().write("The RegionServer is initializing!");
044      resp.getWriter().close();
045      return;
046    }
047
048    RSStatusTmpl tmpl = new RSStatusTmpl();
049    if (req.getParameter("format") != null) tmpl.setFormat(req.getParameter("format"));
050    if (req.getParameter("filter") != null) tmpl.setFilter(req.getParameter("filter"));
051    if (req.getParameter("bcn") != null) tmpl.setBcn(req.getParameter("bcn"));
052    if (req.getParameter("bcv") != null) tmpl.setBcv(req.getParameter("bcv"));
053    tmpl.render(resp.getWriter(), hrs);
054  }
055}