com.cosylab.epics.caj.cas

Class ProcessVariableEventDispatcher

java.lang.Object

com.cosylab.epics.caj.cas.ProcessVariableEventDispatcher

All Implemented Interfaces:

ProcessVariableEventCallback

public class ProcessVariableEventDispatcher
extends Object
implements ProcessVariableEventCallback

Event callback dispatcher (fan-out).

Version:

$id$

Author:

Matej Sekoranja

Field Summary

Fields

Modifier and Type	Field and Description
protected ProcessVariableEventCallback[]	cachedList
protected ArrayList	listeners List of listeners.
protected ProcessVariable	processVariable PV to dispatch for.

Constructor Summary

Constructors

Constructor and Description
ProcessVariableEventDispatcher(ProcessVariable processVariable) Constructor.

Method Summary

Modifier and Type	Method and Description
void	canceled() Notify about asynchronous operation cancellation.
ProcessVariable	getProcessVariable() Get served PV.
void	postEvent(int select, DBR event) Notify about process variable event.
void	registerEventListener(ProcessVariableEventCallback listener) Register new listener.
void	setProcessVariable(ProcessVariable processVariable) Set served PV (allow PV to be set later to avoid chicken-egg problem).
void	unregisterEventListener(ProcessVariableEventCallback listener) Unregister new listener.

Methods inherited from class java.lang.Object

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

Field Detail

processVariable

protected ProcessVariable processVariable

PV to dispatch for.

listeners

protected ArrayList listeners

List of listeners.

cachedList

protected ProcessVariableEventCallback[] cachedList

Constructor Detail

ProcessVariableEventDispatcher

public ProcessVariableEventDispatcher(ProcessVariable processVariable)

Constructor.

Parameters:

processVariable - PV to dispatch for, can be null.

Method Detail

getProcessVariable

public ProcessVariable getProcessVariable()

Get served PV.

Returns:

the processVariable

setProcessVariable

public void setProcessVariable(ProcessVariable processVariable)

Set served PV (allow PV to be set later to avoid chicken-egg problem).

Parameters:

processVariable - the processVariable to set

postEvent

public void postEvent(int select,
                      DBR event)

Description copied from interface: ProcessVariableEventCallback

Notify about process variable event.

Specified by:

postEvent in interface ProcessVariableEventCallback

Parameters:

select - Monitor.[mask] event type.

event - event of type DBR_TIME_ where type is of ProcessVariable.getType().

See Also:

ProcessVariableEventCallback.postEvent(int, gov.aps.jca.dbr.DBR)

registerEventListener

public void registerEventListener(ProcessVariableEventCallback listener)

Register new listener.

Parameters:

listener -

unregisterEventListener

public void unregisterEventListener(ProcessVariableEventCallback listener)

Unregister new listener.

Parameters:

listener -

canceled

public void canceled()

Notify about asynchronous operation cancellation.

See Also:

CompletionCallback.canceled()