content: /*
   * 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.inputtools.mdl;
  
  
  import java.io.*;
  import java.lang.management.ManagementFactory;
  import java.nio.charset.Charset;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  public class LoaderServer {
  
    String name;
    private static Log log = LogFactory.getLog(LoaderServer.class);
    private FileOutputStream pidFileOutput = null;
  
    public LoaderServer(String name) {
      this.name = name;
    }
  
    public void init() throws IOException {
      String pidLong = ManagementFactory.getRuntimeMXBean().getName();
      String[] items = pidLong.split("@");
      String pid = items[0];
      String chukwaPath = System.getProperty("CHUKWA_HOME");
      StringBuffer pidFilesb = new StringBuffer();
      pidFilesb.append(chukwaPath).append("/var/run/").append(name)
          .append(".pid");
      try {
        File pidFile = new File(pidFilesb.toString());
        pidFileOutput = new FileOutputStream(pidFile);
        pidFileOutput.write(pid.getBytes(Charset.forName("UTF-8")));
        pidFileOutput.flush();
      } catch (IOException ex) {
        System.out.println("Initializaiton failed: can not write pid file.");
        log.error("Initialization failed...");
        log.error(ex.getMessage());
        throw ex;
      }
  
    }
  
    public void clean() {
      String chukwaPath = System.getenv("CHUKWA_HOME");
      StringBuffer pidFilesb = new StringBuffer();
      pidFilesb.append(chukwaPath).append("/var/run/").append(name)
          .append(".pid");
      String pidFileName = pidFilesb.toString();
  
      File pidFile = new File(pidFileName);
      if (!pidFile.exists()) {
        log.error("Delete pid file, No such file or directory: " + pidFileName);
      } else {
        try {
          pidFileOutput.close();
        } catch (IOException e) {
          log.error("Unable to release file lock: " + pidFileName);
        }
      }
  
      boolean result = pidFile.delete();
      if (!result) {
        log.error("Delete pid file failed, " + pidFileName);
      }
    }
  
  }
  