org.eclipse.scada.da.client

Class ItemSyncController

java.lang.Object

org.eclipse.scada.da.client.ItemSyncController

All Implemented Interfaces:

ItemUpdateListener

public class ItemSyncController
extends Object
implements ItemUpdateListener

A controller that synchronizes the subscription state for one item.

Author:

Jens Reimann

Constructor Summary

Constructors

Constructor and Description
ItemSyncController(Connection connection, ItemManagerImpl itemManager, String itemId)

Method Summary

Modifier and Type	Method and Description
void	add(ItemUpdateListener listener)
void	disconnect()
String	getItemName()
void	notifyDataChange(Variant value, Map<String,Variant> attributes, boolean cache) A change on the data item occurred.
void	notifySubscriptionChange(SubscriptionState subscriptionState, Throwable e) Notify a change in the subscription change
void	remove(ItemUpdateListener listener)
protected void	subscribe()
void	sync(boolean force)
protected void	unsubscribe()

Methods inherited from class java.lang.Object

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

Constructor Detail

ItemSyncController

public ItemSyncController(Connection connection,
                          ItemManagerImpl itemManager,
                          String itemId)

Method Detail

getItemName

public String getItemName()

add

public void add(ItemUpdateListener listener)

remove

public void remove(ItemUpdateListener listener)

sync

public void sync(boolean force)

subscribe

protected void subscribe()

unsubscribe

protected void unsubscribe()

notifyDataChange

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

Description copied from interface: ItemUpdateListener

A change on the data item occurred.

Specified by:

notifyDataChange in interface ItemUpdateListener

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

public void notifySubscriptionChange(SubscriptionState subscriptionState,
                                     Throwable e)

Description copied from interface: ItemUpdateListener

Notify a change in the subscription change

Specified by:

notifySubscriptionChange in interface ItemUpdateListener

Parameters:

subscriptionState - the new subscription change

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

disconnect

public void disconnect()