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}