org.eclipse.scada.ds

Class DataNodeTracker

java.lang.Object

org.eclipse.scada.ds.DataNodeTracker

public class DataNodeTracker
extends Object

Constructor Summary

Constructors

Constructor and Description
DataNodeTracker(org.osgi.framework.BundleContext context)

Method Summary

Modifier and Type	Method and Description
void	addListener(String nodeId, DataListener listener) Add a listener for a data node
void	close()
protected void	handleService(DataStore service)
void	open()
void	removeListener(String nodeId, DataListener listener) Remove a listener for a data node
boolean	write(DataNode node) Write to the data node if there currently is a service attached

Methods inherited from class java.lang.Object

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

Constructor Detail

DataNodeTracker

public DataNodeTracker(org.osgi.framework.BundleContext context)

Method Detail

handleService

protected void handleService(DataStore service)

open

public void open()

close

public void close()

addListener

public void addListener(String nodeId,
                        DataListener listener)

Add a listener for a data node

Parameters:

nodeId - the node to listen to

listener - the listener to add

removeListener

public void removeListener(String nodeId,
                           DataListener listener)

Remove a listener for a data node

Parameters:

nodeId - the node to remove the listener from

listener - the listener to remove

write

public boolean write(DataNode node)

Write to the data node if there currently is a service attached

Parameters:

node - the node to write

Returns:

true if the service was attached an the request was passed on to the service, false otherwise.