org.eclipse.scada.ds.storage

Class AbstractStorage

java.lang.Object

org.eclipse.scada.ds.storage.AbstractStorage

All Implemented Interfaces:

DataStore

Direct Known Subclasses:

StorageImpl, StorageImpl

public abstract class AbstractStorage
extends Object
implements DataStore

Constructor Summary

Constructors

Constructor and Description
AbstractStorage()

Method Summary

Methods

Modifier and Type	Method and Description
void	attachListener(String nodeId, DataListener listener) Attach a listener to a data node
void	detachListener(String nodeId, DataListener listener)
void	dispose() Dispose the service.
protected void	fireUpdate(DataNode node)
protected abstract Executor	getExecutor() Provide an executor for sending events
abstract NotifyFuture<DataNode>	readNode(String nodeId) Get the data node

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.scada.ds.DataStore

deleteNode, writeNode

Constructor Detail

AbstractStorage

public AbstractStorage()

Method Detail

readNode

public abstract NotifyFuture<DataNode> readNode(String nodeId)

Description copied from interface: DataStore

Get the data node

Specified by:

readNode in interface DataStore

Parameters:

nodeId - the id of the node to get

Returns:

the future to the read request. The future will return null if the node does not exists.

getExecutor

protected abstract Executor getExecutor()

Provide an executor for sending events

This method is only called after the constructor is completed

Returns:

the executor to use, must never return null

dispose

public void dispose()

Dispose the service.

This method still needs a valid executor using getExecutor().

attachListener

public void attachListener(String nodeId,
                  DataListener listener)

Description copied from interface: DataStore

Attach a listener to a data node

The listener is called with the current status of the node when attaching.

Specified by:

attachListener in interface DataStore

Parameters:

nodeId - the node id to attach to

listener - the listener that will receive events

detachListener

public void detachListener(String nodeId,
                  DataListener listener)

Specified by:

detachListener in interface DataStore

fireUpdate

protected void fireUpdate(DataNode node)