org.eclipse.scada.da.datasource.item

Class DataItemTargetImpl

java.lang.Object

org.eclipse.scada.da.server.common.DataItemBase

org.eclipse.scada.da.datasource.item.DataItemTargetImpl

All Implemented Interfaces:

DataSourceListener, DataItem

public class DataItemTargetImpl
extends DataItemBase
implements DataSourceListener

Field Summary

Fields inherited from class org.eclipse.scada.da.server.common.DataItemBase

listener

Constructor Summary

Constructors

Constructor and Description
DataItemTargetImpl(ObjectPoolTracker<DataSource> poolTracker, DataItemInformation information, String dataSourceId)

Method Summary

Modifier and Type	Method and Description
void	dispose()
Map<String,Variant>	getAttributes()
protected Map<String,Variant>	getCacheAttributes()
protected Variant	getCacheValue()
NotifyFuture<Variant>	readValue() The read operation of a data item.
protected void	setDataSource(DataSource dataSource)
NotifyFuture<WriteAttributeResults>	startSetAttributes(Map<String,Variant> attributes, OperationParameters operationParameters) Start the write attributes operation
NotifyFuture<WriteResult>	startWriteValue(Variant value, OperationParameters operationParameters) The write operation of a data item.
void	stateChanged(DataItemValue value)

Methods inherited from class org.eclipse.scada.da.server.common.DataItemBase

getInformation, handleListenerChange, notifyData, notifyData, setListener

Methods inherited from class java.lang.Object

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

Constructor Detail

DataItemTargetImpl

public DataItemTargetImpl(ObjectPoolTracker<DataSource> poolTracker,
                          DataItemInformation information,
                          String dataSourceId)
                   throws org.osgi.framework.InvalidSyntaxException

Throws:

org.osgi.framework.InvalidSyntaxException

Method Detail

getCacheAttributes

protected Map<String,Variant> getCacheAttributes()

Overrides:

getCacheAttributes in class DataItemBase

getCacheValue

protected Variant getCacheValue()

Overrides:

getCacheValue in class DataItemBase

setDataSource

protected void setDataSource(DataSource dataSource)

getAttributes

public Map<String,Variant> getAttributes()

Specified by:

getAttributes in interface DataItem

readValue

public NotifyFuture<Variant> readValue()
                                throws InvalidOperationException

Description copied from interface: DataItem

The read operation of a data item.

Specified by:

readValue in interface DataItem

Returns:

The value read from the subsystem.

Throws:

InvalidOperationException - Raised if "read" is not a valid operation for this item

startSetAttributes

public NotifyFuture<WriteAttributeResults> startSetAttributes(Map<String,Variant> attributes,
                                                              OperationParameters operationParameters)

Description copied from interface: DataItem

Start the write attributes operation

Specified by:

startSetAttributes in interface DataItem

Parameters:

attributes - attributes to set

Returns:

the future to the operation

startWriteValue

public NotifyFuture<WriteResult> startWriteValue(Variant value,
                                                 OperationParameters operationParameters)

Description copied from interface: DataItem

The write operation of a data item.

Specified by:

startWriteValue in interface DataItem

Parameters:

value - The value to write to the subsystem

Returns:

the future to the operation

dispose

public void dispose()

stateChanged

public void stateChanged(DataItemValue value)

Specified by:

stateChanged in interface DataSourceListener