org.eclipse.scada.da.server.common

Class MemoryDataItem

java.lang.Object

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

org.eclipse.scada.da.server.common.MemoryDataItem

All Implemented Interfaces:

DataItem

public class MemoryDataItem
extends DataItemBase

Field Summary

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

listener

Constructor Summary

Constructors

Modifier	Constructor and Description
	MemoryDataItem(String name)
protected	MemoryDataItem(String name, EnumSet<IODirection> ioDirection)

Method Summary

Modifier and Type	Method and Description
Map<String,Variant>	getAttributes()
protected Map<String,Variant>	getCacheAttributes()
protected Variant	getCacheValue()
NotifyFuture<Variant>	readValue() The read operation of a data item.
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.

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

MemoryDataItem

public MemoryDataItem(String name)

MemoryDataItem

protected MemoryDataItem(String name,
                         EnumSet<IODirection> ioDirection)

Method Detail

readValue

public NotifyFuture<Variant> readValue()
                                throws InvalidOperationException

Description copied from interface: DataItem

The read operation of a data item.

Returns:

The value read from the subsystem.

Throws:

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

startWriteValue

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

Description copied from interface: DataItem

The write operation of a data item.

Parameters:

value - The value to write to the subsystem

Returns:

the future to the operation

getAttributes

public Map<String,Variant> getAttributes()

getCacheAttributes

protected Map<String,Variant> getCacheAttributes()

Overrides:

getCacheAttributes in class DataItemBase

getCacheValue

protected Variant getCacheValue()

Overrides:

getCacheValue in class DataItemBase

startSetAttributes

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

Description copied from interface: DataItem

Start the write attributes operation

Parameters:

attributes - attributes to set

Returns:

the future to the operation