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.tool;
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.tmpl.tool.CanaryStatusTmpl;
026import org.apache.yetus.audience.InterfaceAudience;
027
028@InterfaceAudience.Private
029public class CanaryStatusServlet extends HttpServlet {
030  @Override
031  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
032    throws ServletException, IOException {
033    CanaryTool.RegionStdOutSink sink =
034      (CanaryTool.RegionStdOutSink) getServletContext().getAttribute("sink");
035    if (sink == null) {
036      throw new ServletException(
037        "RegionStdOutSink is null! The CanaryTool's InfoServer is not initialized correctly");
038    }
039
040    resp.setContentType("text/html");
041
042    CanaryStatusTmpl tmpl = new CanaryStatusTmpl();
043    tmpl.render(resp.getWriter(), sink);
044  }
045
046}