ApacheCommonsDaemon

1_description.markdown

Apache Commons Daemon

サンプルプログラムと起動スクリプト

公式サイト

http://commons.apache.org/proper/commons-daemon

ブログ記事

http://www.task-notes.com/entry/20150408/1428462000

jsvcd

#!/bin/sh
NAME="testdaemon"
DESC="TestDaemon service"

# The path to Jsvc
EXEC="/usr/local/bin/jsvc"

# The path to the folder containing MyDaemon.jar
FILE_PATH="/usr/local/$NAME"

# The path to the folder containing the java runtime
JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk1.8.0_40.jdk/Contents/Home"

# Our classpath including our jar file and the Apache Commons Daemon library
CLASS_PATH="$FILE_PATH/TestDaemon.jar:$FILE_PATH/lib/commons-daemon-1.0.15.jar"

# The fully qualified name of the class to execute
CLASS="com.tasknotes.daemon.TestDaemon"

#The user to run the daemon as
USER="root"

# The file that will contain our process identification number (pid) for other scripts/programs that need to access it.
PID="/var/run/$NAME.pid"

# System.out writes to this file...
LOG_OUT="$FILE_PATH/log/$NAME.out"

# System.err writes to this file...
LOG_ERR="$FILE_PATH/err/$NAME.err"

jsvc_exec()
{
  cd $FILE_PATH
  $EXEC -home $JAVA_HOME -cp $CLASS_PATH -user $USER -outfile $LOG_OUT -errfile $LOG_ERR -pidfile $PID $1 $CLASS
}

case "$1" in
  start)
    echo "Starting the $DESC..."

    # Start the service
    jsvc_exec

    echo "The $DESC has started."
  ;;
  stop)
    echo "Stopping the $DESC..."

    # Stop the service
    jsvc_exec "-stop"

    echo "The $DESC has stopped."
  ;;
  restart)
    if [ -f "$PID" ]; then

      echo "Restarting the $DESC..."

      # Stop the service
      jsvc_exec "-stop"

      # Start the service
      jsvc_exec

      echo "The $DESC has restarted."
    else
      echo "Daemon not running, no action taken"
      exit 1
    fi
  ;;
  *)
    echo "Usage: /etc/init.d/$NAME {start|stop|restart}" >&2
    exit 3
  ;;
esac

TestDaemon.java

package com.tasknotes.daemon;

import org.apache.commons.daemon.Daemon;
import org.apache.commons.daemon.DaemonContext;
import org.apache.commons.daemon.DaemonInitException;

public class TestDaemon implements Daemon {

  private Thread thread; 
  private boolean stopped = false;

  @Override
  public void start() throws Exception {
    thread.start();
  }

  @Override
  public void stop() throws Exception {
    stopped = true;
    try {
      thread.join();
    } catch (InterruptedException e) {
      System.err.println(e.getMessage());
      throw e;
    }
  }

  @Override
  public void destroy() {
    thread = null;
  }

  @Override
  public void init(DaemonContext daemonContext) throws DaemonInitException, InterruptedException, Exception {
    thread = new Thread() {
      private long i = 0;
      @Override
      public void run() {
        while(!stopped) {
          System.out.println(i++);
          try {
            sleep(1000);
          } catch (InterruptedException e) {
            System.err.println(e.getMessage());
          }
        }
      }
    };
  }
}