apps.multicast
Class MulticastApplication

java.lang.Object
  |
  +--ants.core.Entity
        |
        +--ants.core.Application
              |
              +--apps.multicast.MulticastApplication

public class MulticastApplication

extends Application

The Multicast test application for ANTSR(R). Input: -delay n Number of milliseconds to wait between multicast subscriptions or number of milliseconds to wait between multicasts. -target a Address of multicast sender (target for subscriptions). -group a Multicast group "address". Output: This program generates output indicating when capsules are received.

Author:

David Wetherall

Fields inherited from class ants.core.Application

defaults

Constructor Summary

MulticastApplication()

Method Summary

void	receive(Capsule cap) Callback for packets that are delivered to this application.
void	setArgs(KeyArgs k) Parse command line arguments for this application.
void	start() Start this Application rolling.

Methods inherited from class ants.core.Application

getDefaultResources, getDefaultTTL, getNode, getNodeAddress, getPort, getPrincipal, send, send, setDefaultResources, setDefaultTTL, thisNode, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

MulticastApplication

public MulticastApplication()

Method Detail

receive

public void receive(Capsule cap)

Description copied from class: Application

Callback for packets that are delivered to this application. This does nothing, so the default behavior for the application is to drop delivered packets on the floor.

Overrides:

receive in class Application

Tags copied from class: Application

Parameters:

cap - the Capsule that got delivered. XXX state of Xdr?

setArgs

public void setArgs(KeyArgs k)
             throws InvalidKeyArgsException

Description copied from class: Application

Parse command line arguments for this application. Understands the -port option and the -principal option.

It is guaranteed that this method will be invoked before the application starts running (i.e. shortly after the constructor is invoked).

XXX A security issue related to this method is that a mallicious application could change its parameters by invoking this method after startup. For example, the application could change its principal to "Administrator". To avoid any pitfalls, the local copies of the argument variables should be ignored once control is given over to the application's start method

Overrides:

setArgs in class Application

Tags copied from class: Application

See Also:

#port, KeyArgs

start

public void start()
           throws java.lang.Exception

Description copied from class: Application

Start this Application rolling. This is invoked once by the Node after it has been initialized.

Note that implementations of start should just set things up. If the application wants to do things like send packets, this function should start a new thread to do that. Creating a GUI and associating callbacks is a good thing to do here.

XXX mostly stuff that could just be done in the no-arg constructor, no?

Overrides:

start in class Application