/*
    * 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.chukwa.datacollection.test;
  
  
  import org.apache.hadoop.chukwa.conf.ChukwaConfiguration;
  import org.apache.hadoop.chukwa.datacollection.agent.ChukwaAgent;
  import org.apache.hadoop.chukwa.datacollection.collector.servlet.ServletCollector;
  import org.apache.hadoop.chukwa.datacollection.connector.http.HttpConnector;
  import org.apache.hadoop.chukwa.datacollection.controller.ChukwaAgentController;
  import org.apache.hadoop.chukwa.datacollection.writer.ConsoleWriter;
  import org.apache.hadoop.chukwa.datacollection.writer.SeqFileWriter;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.log4j.Logger;
  import org.mortbay.jetty.Server;
  import org.mortbay.jetty.servlet.Context;
  import org.mortbay.jetty.servlet.ServletHolder;
  
  import java.io.*;
  import java.util.*;
  
  public class FileTailerStressTest {
  
    static final int DELAY_MIN = 10 * 1000;
    static final int DELAY_RANGE = 2 * 1000;
    static final Logger log = Logger.getLogger(FileTailerStressTest.class);
  
    static class OccasionalWriterThread extends Thread {
      File file;
  
      OccasionalWriterThread(File f) {
        file = f;
      }
  
      public void run() {
        PrintWriter out = null;
        try {
          out = new PrintWriter(file.getAbsolutePath(), "UTF-8");
          Random rand = new Random();
          while (true) {
            int delay = rand.nextInt(DELAY_RANGE) + DELAY_MIN;
            Thread.sleep(delay);
            Date d = new Date();
            out.println("some test data written at " + d.toString());
            out.flush();
          }
        } catch (IOException e) {
          e.printStackTrace();
        } catch (InterruptedException e) {
          if(out != null) {
            out.close();
          }
        }
      }
    }
  
    static int FILES_TO_USE = 100;
  
    /**
     * @param args is command line parameters
     */
    public static void main(String[] args) {
      try {
        Server server = new Server(9990);
        Context root = new Context(server, "/", Context.SESSIONS);
  
        Configuration conf =  new Configuration();
        ServletCollector collector = new ServletCollector(conf);
        collector.setWriter(new ConsoleWriter(true));
        root.addServlet(new ServletHolder(collector), "/*");
        server.start();
        server.setStopAtShutdown(false);
  
        Thread.sleep(1000);
        ChukwaAgent agent = ChukwaAgent.getAgent();
        HttpConnector connector = new HttpConnector(agent,
            "http://localhost:9990/chukwa");
        connector.start();
  
        ChukwaConfiguration cc = new ChukwaConfiguration();
        int portno = cc.getInt("chukwaAgent.control.port", 9093);
        ChukwaAgentController cli = new ChukwaAgentController("localhost", portno);
  
       File workdir = new File("/tmp/stresstest/");
       if(!workdir.mkdir()) {
         log.warn("Error creating working directory:" + workdir.getAbsolutePath());
       }
       for (int i = 0; i < FILES_TO_USE; ++i) {
         File newTestF = new File("/tmp/stresstest/" + i);
 
         newTestF.deleteOnExit();
         (new OccasionalWriterThread(newTestF)).start();
         cli.addFile("test-lines", newTestF.getAbsolutePath());
       }
 
       Thread.sleep(60 * 1000);
       System.out.println("cleaning up");
       if(!workdir.delete()) {
         log.warn("Error clean up working directory:" + workdir.getAbsolutePath());
       }
     } catch (Exception e) {
       e.printStackTrace();
     }
   }
 
 }