Class RemoteService.agent.ServiceBroker 
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Class RemoteService.agent.ServiceBroker 

java.lang.Object
   |
   +----JavaAgent.agent.Agent
           |
           +----JavaAgent.agent.ANS
                   |
                   +----RemoteService.agent.ServiceBroker
public class ServiceBroker
extends ANS
ServiceBroker is a subclass of ANS which functions as a central repository of Services for a group of Client and Service Agents. The ServiceBroker maintains a listing of registered services and the ServiceAgents which manage them.

Copyright (c) 1995, H. Robert Frost, Stanford University. All rights reserved.

Copyright (c) 1996, H. Robert Frost, Enterprise Integration Technologies, Inc. All rights reserved.

RESTRICTED RIGHTS LEGEND: Use, duplication or disclosure by the Government is subject to restrictions as set forth in subparagraph(c)(1)(ii) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013 and in similar clauses in the FAR and NASA FAR supplement.

This software is bound by the terms and conditions listed in the attached LICENSE file.

Variable Index

o clients
Contains the names of all Agent's who have submitted ask-available messages.

Constructor Index

o ServiceBroker(ContextInterface, String, URL, URL, File, File)
Contructs a ServiceBroker.

Method Index

o addClient(String)
Adds a name to the clients list.
o getClients()
o init()
Creates the ResourceManager, MessageHandler and reads in the init_file.
o removeClient(String)
Removes a name from the clients list.
o resourceChanged(Resource)
Called by a Resource object when the number of elements has changed.
o SendUnregisterMessage(String, String)
Send unregister-service messages to all of the agents in the address buffer.

Variables

o clients 
  protected Vector clients
Contains the names of all Agent's who have submitted ask-available messages. When a service is registered or unregistered, all of the agents in this list are informed.

Constructors

o ServiceBroker 
  public ServiceBroker(ContextInterface context,
                       String n,
                       URL init_url,
                       URL shared_url,
                       File shared_dir,
                       File working_dir)
Contructs a ServiceBroker.
Parameters:
n - String identifier for the Agent.
init_url - URL for the initialization file.
shared_url - URL for shared classes.
shared_dir - Directory for local access to shared classes.
working_dir - Directory for local files, will be null if the Agent is unable to write to the local file system.

Methods

o init 
  public void init()
Creates the ResourceManager, MessageHandler and reads in the init_file.
Overrides:
init in class ANS
o addClient 
  public void addClient(String client)
Adds a name to the clients list.
Parameters:
client - Name of the agent.
o removeClient 
  public void removeClient(String client)
Removes a name from the clients list.
Parameters:
client - Name of the agent.
o getClients 
  public Enumeration getClients()
Returns:
An enumeration of all the client agent names.
o SendUnregisterMessage 
  public void SendUnregisterMessage(String name,
                                    String service_agent)
Send unregister-service messages to all of the agents in the address buffer.
Parameters:
name - Service name which is being unregistered.
o resourceChanged 
  public void resourceChanged(Resource r)
Called by a Resource object when the number of elements has changed.
Parameters:
type - Type of the Resource.
Overrides:
resourceChanged in class Agent 
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