org.mmbase.core.util
Class DaemonThread

java.lang.Object
  java.lang.Thread
      org.mmbase.core.util.DaemonThread

All Implemented Interfaces:

DaemonTask, Runnable

Direct Known Subclasses:

ModuleProbe

public class DaemonThread

extends Thread

implements DaemonTask

Defines a daemon thread that runs in the threadgroup belonging to this MMBase context.

Since:

MMBase-1.8

Version:

$Id: DaemonThread.java,v 1.2 2005/12/10 11:45:02 michiel Exp $

Author:

Pierre van Rooden

Field Summary

static int	DEFAULT_SLEEP_PERIOD Default sleep period for a daemon thread (one minute).
protected int	sleepPeriod The threads sleep period.

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

DaemonThread()
Create a MMBase daemon thread (associated with this MMBase's threadgroup).

DaemonThread(Runnable target, String name)
Create a MMBase daemon thread (associated with this MMBase's threadgroup).

DaemonThread(String name)
Create a MMBase daemon thread (associated with this MMBase's threadgroup).

Method Summary

void	executeTask() Defines a task that need be run by a daemon thread's run() method.
int	getSleepPeriod() Returns this task's sleep period.
DaemonTask	getTask() Returns the task this thread runs when started.
void	interrupt()
boolean	isRunning()
void	run() Default behavior (when no target is specified) is to run continuously until interrupted.
void	setTask(DaemonTask task) Sets the task this thread should run when started.
void	start()

Methods inherited from class java.lang.Thread

activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getContextClassLoader, getName, getPriority, getThreadGroup, holdsLock, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setName, setPriority, sleep, sleep, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_SLEEP_PERIOD

public static final int DEFAULT_SLEEP_PERIOD

Default sleep period for a daemon thread (one minute).

See Also:

Constant Field Values

sleepPeriod

protected int sleepPeriod

The threads sleep period. This period is used when a Daemonthread runs on its own (that is, without an assigned task) When a DaemonThread is assigned a task, it uses the sleep period of that task.

Constructor Detail

DaemonThread

public DaemonThread()

Create a MMBase daemon thread (associated with this MMBase's threadgroup).

DaemonThread

public DaemonThread(String name)

Create a MMBase daemon thread (associated with this MMBase's threadgroup).

Parameters:

name - the name of the thread

DaemonThread

public DaemonThread(Runnable target,
                    String name)

Create a MMBase daemon thread (associated with this MMBase's threadgroup).

Parameters:

target - the target thread

name - the name of the thread

Method Detail

setTask

public void setTask(DaemonTask task)

Sets the task this thread should run when started.

Parameters:

task - the task to run

getTask

public DaemonTask getTask()

Returns the task this thread runs when started.

getSleepPeriod

public int getSleepPeriod()

Description copied from interface: DaemonTask

Returns this task's sleep period.

Specified by:

getSleepPeriod in interface DaemonTask

start

public void start()

interrupt

public void interrupt()

isRunning

public boolean isRunning()

executeTask

public void executeTask()

Description copied from interface: DaemonTask

Defines a task that need be run by a daemon thread's run() method.

Specified by:

executeTask in interface DaemonTask

run

public void run()

Default behavior (when no target is specified) is to run continuously until interrupted.

Specified by:

run in interface Runnable