org.eclipse.scada.da.server.common.impl

Class DataItemSubscriptionSource

java.lang.Object

org.eclipse.scada.da.server.common.impl.DataItemSubscriptionSource

All Implemented Interfaces:

SubscriptionSource<String>, ItemListener

public class DataItemSubscriptionSource
extends Object
implements SubscriptionSource<String>, ItemListener

A subscription source for data items. This SubscriptionSource does not use a hint object.

Author:

Jens Reimann

Constructor Summary

Constructors

Constructor and Description
DataItemSubscriptionSource(Executor executor, DataItem dataItem, HiveEventListener hiveEventListener)

Method Summary

Modifier and Type	Method and Description
void	addListener(Collection<SubscriptionInformation<String>> listeners)
void	dataChanged(DataItem item, Variant variant, Map<String,Variant> attributes, boolean cache)
void	removeListener(Collection<SubscriptionInformation<String>> listeners)
boolean	supportsListener(SubscriptionInformation<String> subscriptionInformation) Validate if the provided subcription information can bind to this subscription source

Methods inherited from class java.lang.Object

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

Constructor Detail

DataItemSubscriptionSource

public DataItemSubscriptionSource(Executor executor,
                                  DataItem dataItem,
                                  HiveEventListener hiveEventListener)

Method Detail

addListener

public void addListener(Collection<SubscriptionInformation<String>> listeners)

Specified by:

addListener in interface SubscriptionSource<String>

removeListener

public void removeListener(Collection<SubscriptionInformation<String>> listeners)

Specified by:

removeListener in interface SubscriptionSource<String>

supportsListener

public boolean supportsListener(SubscriptionInformation<String> subscriptionInformation)

Description copied from interface: SubscriptionSource

Validate if the provided subcription information can bind to this subscription source

Specified by:

supportsListener in interface SubscriptionSource<String>

Parameters:

subscriptionInformation - The information to check

Returns:

true if the listener can bind to this event source. In this case the SubscriptionSource.addListener(Collection) method may not reject the listener.

dataChanged

public void dataChanged(DataItem item,
                        Variant variant,
                        Map<String,Variant> attributes,
                        boolean cache)

Specified by:

dataChanged in interface ItemListener