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.tool;
020
021import java.io.IOException;
022import javax.servlet.ServletException;
023import javax.servlet.http.HttpServlet;
024import javax.servlet.http.HttpServletRequest;
025import javax.servlet.http.HttpServletResponse;
026import org.apache.hadoop.hbase.tmpl.tool.CanaryStatusTmpl;
027import org.apache.yetus.audience.InterfaceAudience;
028
029
030@InterfaceAudience.Private
031public class CanaryStatusServlet extends HttpServlet {
032  @Override
033  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
034    throws ServletException, IOException {
035    CanaryTool.RegionStdOutSink sink =
036      (CanaryTool.RegionStdOutSink) getServletContext().getAttribute(
037        "sink");
038    if (sink == null) {
039      throw new ServletException(
040        "RegionStdOutSink is null! The CanaryTool's InfoServer is not initialized correctly");
041    }
042
043    resp.setContentType("text/html");
044
045    CanaryStatusTmpl tmpl = new CanaryStatusTmpl();
046    tmpl.render(resp.getWriter(), sink);
047  }
048
049}