Example Usage

Testing a forward-error correction scheme to cope with an unreliable network:

Pipeline( RateControlledFileReader("sourcefile",rate=1000000),
          MyForwardErrorCorrector(),
          Duplicate(),
          Throwaway(),
          Reorder(),
          MyErrorRecoverer(),
          SimpleFileWriter("receiveddata")
        ).activate()

Duplicate, Throwaway, Reorder

These three components all receive data and, respectively, randomly duplicate packets, re-order packets or throw some packets away.

They can be used to simulate the effects of multicast delivery over wireless or a WAN.

More details

These component all receive data on their "inbox" inbox and send it on to their "outbox" outbox. However, they will sometimes tamper with the data in the manners described!

None of these components terminate when sent shutdown messages.

History

This was used for the development of a simple recovery protocol. The actual version in use replaces the string2tuple and tuple2string code (in sketches in tomg.py, omitted here), with something more robust.

class Duplicate(Axon.Component.component)

Duplicate() -> new component.

This component passes on data it receives. Sometimes it randomly duplicates items.

class Reorder(Axon.Component.component)

Reorder() -> new component

This component passes on data it receives, but will sometimes jumble it up (reordering it).

class Throwaway(Axon.Component.component)

Throwaway() -> new component.

This component passes on data it receives, but sometimes it doesn't!