001/**
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019package org.apache.hadoop.hbase.regionserver;
020
021import java.io.IOException;
022
023import javax.servlet.ServletException;
024import javax.servlet.http.HttpServlet;
025import javax.servlet.http.HttpServletRequest;
026import javax.servlet.http.HttpServletResponse;
027import org.apache.yetus.audience.InterfaceAudience;
028
029import org.apache.hadoop.hbase.tmpl.regionserver.RSStatusTmpl;
030
031@InterfaceAudience.Private
032public class RSStatusServlet extends HttpServlet {
033  private static final long serialVersionUID = 1L;
034
035  @Override
036  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
037  throws ServletException, IOException {
038    HRegionServer hrs = (HRegionServer)getServletContext().getAttribute(HRegionServer.REGIONSERVER);
039    assert hrs != null : "No RS in context!";
040
041    resp.setContentType("text/html");
042
043    if (!hrs.isOnline()) {
044      resp.getWriter().write("The RegionServer is initializing!");
045      resp.getWriter().close();
046      return;
047    }
048
049    RSStatusTmpl tmpl = new RSStatusTmpl();
050    if (req.getParameter("format") != null)
051      tmpl.setFormat(req.getParameter("format"));
052    if (req.getParameter("filter") != null)
053      tmpl.setFilter(req.getParameter("filter"));
054    if (req.getParameter("bcn") != null)
055      tmpl.setBcn(req.getParameter("bcn"));
056    if (req.getParameter("bcv") != null)
057      tmpl.setBcv(req.getParameter("bcv"));
058    tmpl.render(resp.getWriter(), hrs);
059  }
060}