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Class weblab.net.SubjectImp 

java.lang.Object
   |
   +----java.rmi.server.RemoteObject
           |
           +----java.rmi.server.RemoteServer
                   |
                   +----java.rmi.server.UnicastRemoteObject
                           |
                           +----weblab.net.SubjectImp
public class SubjectImp
extends UnicastRemoteObject
implements Subject
SubjectImp is a data container class. It maintains a list of subscribers and notifies them when its value is updated.

See Also:
Subject

Constructor Index

o SubjectImp(String, WhiteBoardImp)
Constructor.

Method Index

o getDirectory()
Return name and subscriber list of this Subject as a tree structure.
o getValue()
Return current value of this Subject.
o name()
Return name of this Subject.
o setValue(Object)
Publish data to this Subject.
o subscribe(String)
o subscribe(SubscriberInt)
Subscribe to this Subject.
o unsubscribe(String)
Unsubscribe to this Subject.

Constructors

o SubjectImp 
 public SubjectImp(String name,
                   WhiteBoardImp wb) throws RemoteException
Constructor.

Parameters:
name - the Subject's name.

Methods

o getDirectory 
 public TreeNode getDirectory()
Return name and subscriber list of this Subject as a tree structure.

o name 
 public String name() throws RemoteException
Return name of this Subject.

o getValue 
 public Object getValue() throws RemoteException
Return current value of this Subject.

o subscribe 
 public Object subscribe(SubscriberInt s) throws RemoteException
Subscribe to this Subject. Returns the current Subject value.

Parameters:
s - the Subscriber object
o subscribe 
 public Object subscribe(String s) throws RemoteException
o unsubscribe 
 public boolean unsubscribe(String sname) throws RemoteException
Unsubscribe to this Subject. Return true if successful.

Parameters:
sn - the Subscriber's name
o setValue 
 public boolean setValue(Object value) throws RemoteException
Publish data to this Subject. Return true if successful. All register subcribers will be notified. If a subscriber's network connection is broken, it is automatically removed from subscriber list of this Subject.

Parameters:
value - the Object to publish. 
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