org.mmbase.applications.crontab
Class CronDaemon

java.lang.Object
  java.util.TimerTask
      org.mmbase.applications.crontab.CronDaemon

All Implemented Interfaces:

Runnable

public class CronDaemon

extends TimerTask

CronDaemon is a "crontab" clone written in java. The daemon starts a thread that wakes up every minute (it keeps sync by calculating the time to sleep)

Author:

Kees Jongenburger, Michiel Meeuwissen

Method Summary

void	add(CronEntry entry) Adds the given CronEntry to this daemon.
protected void	addEntry(CronEntry entry) Actually adds, no checks for 'removedEntries' and so on.
protected static CronEntry	getById(Set set, String id) Finds in given set the CronEntry with the given id.
CronEntry	getCronEntry(String id)
Set	getEntries()
static CronDaemon	getInstance() Singleton, Gets (and instantiates, and starts) the one CronDaemon instance.
boolean	isAlive()
static void	main(String[] argv) main only for testing purposes
void	remove(CronEntry entry) Remove the given CronEntry from this daemon.
protected void	removeEntry(CronEntry entry) Actually removes, nor checks for removedEntries' and so on.
void	run() The main loop of the daemon, which of course is a Thread, implemented in run() to satisfy the 'Runnable' interface.
void	start() Starts the daemon, which you might want to do if you have stopped if for some reason.
void	stop() If you like to temporary stop the daemon, call this.

Methods inherited from class java.util.TimerTask

cancel, scheduledExecutionTime

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getById

protected static CronEntry getById(Set set,
                                   String id)

Finds in given set the CronEntry with the given id.

Returns:

a CronEntry if found, null otherwise.

add

public void add(CronEntry entry)

Adds the given CronEntry to this daemon.

Throws:

RuntimeException - If an entry with the same id is present already (unless it is running and scheduled for removal already)

addEntry

protected void addEntry(CronEntry entry)

Actually adds, no checks for 'removedEntries' and so on.

getCronEntry

public CronEntry getCronEntry(String id)

remove

public void remove(CronEntry entry)

Remove the given CronEntry from this daemon. If the entry is currently running, it will be postponed until this job is ready.

removeEntry

protected void removeEntry(CronEntry entry)

Actually removes, nor checks for removedEntries' and so on.

start

public void start()

Starts the daemon, which you might want to do if you have stopped if for some reason. The daemon is already started on default.

stop

public void stop()

If you like to temporary stop the daemon, call this.

isAlive

public boolean isAlive()

getInstance

public static CronDaemon getInstance()

Singleton, Gets (and instantiates, and starts) the one CronDaemon instance.

run

public void run()

The main loop of the daemon, which of course is a Thread, implemented in run() to satisfy the 'Runnable' interface.

getEntries

public Set getEntries()

Since:

MMBase-1.8

main

public static void main(String[] argv)
                 throws Exception

main only for testing purposes

Throws:

Exception