org.mmbase.module.builders.vwms

Class ImagePusher

java.lang.Object

org.mmbase.module.builders.vwms.ImagePusher

All Implemented Interfaces:

Runnable

public class ImagePusher
extends Object
implements Runnable

A class used to schedule images for transfer. ImagePusher periodically (approx. every 4 seconds) checks it's parent's (ImageMaster) filelist, and pushes the fields in that list on a Queue, which is, in turn, handled by a FileCopier instance.
The reason that this is done by ImagePusher, and not ImageMaster, is that this way double requests for the same file can be filtered out. This seems useful, so perhaps PageMaster might need to use this scheduling system too (or otherwise this should be build into FileCopier).

Version:

$Id$

Author:

Rico Jansen, Pierre van Rooden (javadocs)

Field Summary

Fields

Modifier and Type	Field and Description
(package private) FileCopier	filecopier Thread that handles the actual file transfers.
(package private) Queue	files2copy Queue containing the file-copy tasks that need to be performed by FileCopier
(package private) Thread	kicker The thread reference.
(package private) ImageMaster	parent The class that started the pusher (ImageMaster).
(package private) int	sleepTime Sleeptime for this thread.

Constructor Summary

Constructors

Constructor and Description
ImagePusher(ImageMaster parent) Constructor for the ImagePusher

Method Summary

Modifier and Type	Method and Description
void	doWork() Main work loop.
void	init() Initializes the insatnce by starting a thread.
void	run() Main loop, exception protected
void	start() Starts the main Thread.
void	stop() Stops the main Thread.

Methods inherited from class java.lang.Object

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

Field Detail

kicker

Thread kicker

The thread reference. Setting this object to null stops the thread.

sleepTime

int sleepTime

Sleeptime for this thread. unused as sleeping is arranged by the Queue object.

parent

ImageMaster parent

The class that started the pusher (ImageMaster). Used to retrieve the filelist that needs to be handled.

files2copy

Queue files2copy

Queue containing the file-copy tasks that need to be performed by FileCopier

filecopier

FileCopier filecopier

Thread that handles the actual file transfers.

Constructor Detail

ImagePusher

public ImagePusher(ImageMaster parent)

Constructor for the ImagePusher

Parameters:

parent - The parent that contains and adds the files to handle.

Method Detail

init

public void init()

Initializes the insatnce by starting a thread.

start

public void start()

Starts the main Thread.

stop

public void stop()

Stops the main Thread.

run

public void run()

Main loop, exception protected

Specified by:

run in interface Runnable

doWork

public void doWork()

Main work loop. Periodically checks the files field of its parent. If new files need to be transferred, the files in the parent are cleared. The original list is then purged of duplicates before they are stored in the Queue. A seperate thread (FileCopier) then takes care of the actual transfer.