/**
 * Copyright 2011 The Apache Software Foundation
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hbase.regionserver;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Date;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.monitoring.LogMonitoring;
import org.apache.hadoop.hbase.monitoring.StateDumpServlet;
import org.apache.hadoop.hbase.monitoring.TaskMonitor;
import org.apache.hadoop.util.ReflectionUtils;

public class RSDumpServlet extends StateDumpServlet {
  private static final long serialVersionUID = 1L;
  private static final String LINE =
    "===========================================================";
  
  @Override
  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws IOException {
    HRegionServer hrs = (HRegionServer)getServletContext().getAttribute(
        HRegionServer.REGIONSERVER);
    assert hrs != null : "No RS in context!";

    response.setContentType("text/plain");
    OutputStream os = response.getOutputStream();
    PrintWriter out = new PrintWriter(os);
    
    out.println("Master status for " + hrs.getServerName()
        + " as of " + new Date());
    
    out.println("\n\nVersion Info:");
    out.println(LINE);
    dumpVersionInfo(out);

    out.println("\n\nTasks:");
    out.println(LINE);
    TaskMonitor.get().dumpAsText(out);
    
    out.println("\n\nExecutors:");
    out.println(LINE);
    dumpExecutors(hrs.getExecutorService(), out);
    
    out.println("\n\nStacks:");
    out.println(LINE);
    ReflectionUtils.printThreadInfo(out, "");
    
    out.println("\n\nRS Configuration:");
    out.println(LINE);
    Configuration conf = hrs.getConfiguration();
    out.flush();
    conf.writeXml(os);
    os.flush();
    
    out.println("\n\nLogs");
    out.println(LINE);
    long tailKb = getTailKbParam(request);
    LogMonitoring.dumpTailOfLogs(out, tailKb);
    
    out.flush();
  }  
}