Package de.uka.ipd.sdq.workflow.blackboard

Class Blackboard<T>

java.lang.Object

de.uka.ipd.sdq.workflow.blackboard.Blackboard<T>

Type Parameters:

T - The type of the partitions of the blackboard

All Implemented Interfaces:

IBlackboard<T>

Direct Known Subclasses:

MDSDBlackboard

public class Blackboard<T>
extends Object
implements IBlackboard<T>

A blackboard is a storage space where workflow jobs can retrieve and store data from respectively to. It implements the well known architecture pattern "Blackboard" of POSA I The blackboard contains information pieces called partitions. Each partition contains data needed for a specific type of job. For example, in a compiler, there would be a partition called symbol table to store the detected variable declarations.

Constructor Summary

Constructors

Constructor	Description
Blackboard()

Method Summary

Modifier and Type	Method	Description
void	addPartition(String id, T partition)	Add a specific partition to the blackboard.
T	getPartition(String id)	Get a specific partition from the blackboard identified by the id it was registered with.
boolean	hasPartition(String id)	Query the blackboard for a named partition.
void	removePartition(String id)	Remove a named partition from the blackboard.

Methods inherited from class java.lang.Object

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

Constructor Detail

Blackboard

public Blackboard()

Method Detail

addPartition

public void addPartition(String id,
                         T partition)

Add a specific partition to the blackboard.

Specified by:

addPartition in interface IBlackboard<T>

Parameters:

id - The identifier for the partition to add.

partition - The partition itself.

See Also:

IBlackboard.addPartition(java.lang.String, java.lang.Object)

getPartition

public T getPartition(String id)

Get a specific partition from the blackboard identified by the id it was registered with.

Specified by:

getPartition in interface IBlackboard<T>

Parameters:

id - The id to get the partition for.

Returns:

The requested partition or null if none matching found.

See Also:

IBlackboard.getPartition(java.lang.String)

hasPartition

public boolean hasPartition(String id)

Description copied from interface: IBlackboard

Query the blackboard for a named partition.

Specified by:

hasPartition in interface IBlackboard<T>

Parameters:

id - The ID of the named partition

Returns:

true if the partition exists on the blackboard

removePartition

public void removePartition(String id)

Description copied from interface: IBlackboard

Remove a named partition from the blackboard.

Specified by:

removePartition in interface IBlackboard<T>

Parameters:

id - ID of the partition to removeS