com.ibm.tspaces
Class TupleSpaceObservable

java.lang.Object
  |
  +--java.util.Observable
        |
        +--com.ibm.tspaces.TupleSpaceObservable

public class TupleSpaceObservable

extends java.util.Observable

This class implements the subject (or publisher) in the observer pattern from the "Design Patterns" book. It defines a one-to-many dependency between a TupleSpaceObservable and a number of TupleSpaceObservers. When one TupleSpace changes its state, all its dependents are notified and updated automatically.

Author:

Matthias Eichstaedt

Constructor Summary

TupleSpaceObservable(java.lang.String spaceName, java.lang.String serverName, int port, SuperTuple templateTuple)
Constructs a new observable for a particular tuple space.

TupleSpaceObservable(java.lang.String spaceName, java.lang.String serverName, SuperTuple templateTuple)
Constructs a new observable for a particular tuple space.

TupleSpaceObservable(java.lang.String spaceName, SuperTuple templateTuple)
Constructs a new observable for a particular tuple space.

Method Summary

void	dispose() Disposes this tuplespace publisher.
protected void	setChanged() Indicates that this object has changed.

Methods inherited from class java.util.Observable

addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers

Methods inherited from class java.lang.Object

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

Constructor Detail

TupleSpaceObservable

public TupleSpaceObservable(java.lang.String spaceName,
                            SuperTuple templateTuple)
                     throws TupleSpaceException

Constructs a new observable for a particular tuple space.

Parameters:

spaceName - - name of the tuplespace

templateTuple - - tuple template for the query

Throws:

TupleSpaceException -

TupleSpaceObservable

public TupleSpaceObservable(java.lang.String spaceName,
                            java.lang.String serverName,
                            SuperTuple templateTuple)
                     throws TupleSpaceException

Constructs a new observable for a particular tuple space.

Parameters:

spaceName - - name of the tuplespace

serverName - - name of the tuplespace server

templateTuple - - tuple template for the query

Throws:

TupleSpaceException -

TupleSpaceObservable

public TupleSpaceObservable(java.lang.String spaceName,
                            java.lang.String serverName,
                            int port,
                            SuperTuple templateTuple)
                     throws TupleSpaceException

Constructs a new observable for a particular tuple space.

Parameters:

spaceName - - name of the tuplespace

serverName - - name of the tuplespace server

port - - port number

templateTuple - - tuple template for the query

Throws:

TupleSpaceException -

Method Detail

dispose

public void dispose()

Disposes this tuplespace publisher. Always invoke this method when you need to get rid of a tuplespace publisher.

setChanged

protected void setChanged()

Indicates that this object has changed.

Overrides:

setChanged in class java.util.Observable