org.eclipse.scada.da.client

Interface ItemUpdateListener

All Known Implementing Classes:

ItemSyncController

public interface ItemUpdateListener

Notifies a item on the client that data changed.

Method Summary

Methods

Modifier and Type	Method and Description
void	notifyDataChange(Variant value, Map<String,Variant> attributes, boolean cache) A change on the data item occurred.
void	notifySubscriptionChange(SubscriptionState subscriptionState, Throwable subscriptionError) Notify a change in the subscription change

Method Detail

notifyDataChange

void notifyDataChange(Variant value,
                    Map<String,Variant> attributes,
                    boolean cache)

A change on the data item occurred.

Parameters:

value - The new value, or null if the value did not change

attributes - The attributes that changed, may be null if no attribute change at all. The must be unmodifiable by the receiver

cache - Indicating that the change came from the cache, this means that the change was not triggered by a device and that all attribute where sent, not only the changed ones

notifySubscriptionChange

void notifySubscriptionChange(SubscriptionState subscriptionState,
                            Throwable subscriptionError)

Notify a change in the subscription change

Parameters:

subscriptionState - the new subscription change

subscriptionError - the new subscription error or null if everything is ok