celeboss.command
Interface CommandEngineListener

All Known Implementing Classes:

MonitorWindow

public interface CommandEngineListener

Version:

1.0

Author:

bevans

Field Summary

static int	IDLE State when the engine is idle.
static int	PAUSED State when the engine is paused
static int	PROCESSING State when the engine is processing

Method Summary

void	errorOccured(QueueItem item, java.lang.Exception e) An exception has been thrown in the execution of an item.
void	itemAdded(QueueItem item, int idx) A new itme has been added to the processing queue.
void	itemRemoved(QueueItem item, int idx) A new item has been removed from the processing queue.
void	stateChange(int state, QueueItem item) This method is invoked whenever the processing state of the engine chnages.

Field Detail

IDLE

public static final int IDLE

State when the engine is idle.

See Also:

Constant Field Values

PAUSED

public static final int PAUSED

State when the engine is paused

See Also:

Constant Field Values

PROCESSING

public static final int PROCESSING

State when the engine is processing

See Also:

Constant Field Values

Method Detail

errorOccured

public void errorOccured(QueueItem item,
                         java.lang.Exception e)

An exception has been thrown in the execution of an item. This method is invoked to notify the listener. The Item will still be requeued according to the normal rules.

Parameters:

item - Problem item.

e - Exception generated

itemAdded

public void itemAdded(QueueItem item,
                      int idx)

A new itme has been added to the processing queue. The item is positioned at the specified index.

Parameters:

item - New item.

idx - Index in the queue.

itemRemoved

public void itemRemoved(QueueItem item,
                        int idx)

A new item has been removed from the processing queue. The item is positioned at the specified index.

Parameters:

item - Old item.

idx - Index in the queue.

stateChange

public void stateChange(int state,
                        QueueItem item)

This method is invoked whenever the processing state of the engine chnages. It can be either IDLE, PAUSED or PROCESSING. For the latter state the item that is active will be passed also. The engine will also inform listeners when a new item is processed.

Parameters:

state - State of the engine.

item - Item being process or null if the engine has completed processing or paused.