Kamaelia docs : Kamaelia.Util.RateFilter.VariableByteRate_RequestControl


For examples and more explanations, see the module level docs.

class VariableByteRate_RequestControl(Axon.Component.component)

ByteRate_RequestControl([rate][,chunksize][,chunkrate][,allowchunkaggregation]) -> new ByteRate_RequestControl component.

Controls rate of a data source by, at a controlled rate, emitting integers saying how much data to emit. Rate can be changed at runtime.

Keyword arguments: - rate -- qty of data items per second (default=100000) - chunksize -- None or qty of items per 'chunk' (default=None) - chunkrate -- None or number of chunks per second (default=10) - allowchunkaggregation -- if True, chunksize will be enlarged if 'catching up' is necessary (default=False)

Specify either chunksize or chunkrate, but not both.


  • control : Shutdown signalling
  • inbox : New rate


  • outbox : requests for 'n' items
  • signal : Shutdown signalling

Methods defined here


You should be using the inbox/outbox interface, not these methods (except construction). This documentation is designed as a roadmap as to their functionalilty for maintainers and new component developers.

__init__(self[, rate][, chunksize][, chunkrate][, allowchunkaggregation])

x.__init__(...) initializes x; see x.__class__.__doc__ for signature

changeRate(self, newRate, now)

Change the rate.

Guaranteed to not cause a glitch in the rate of output.

getChunksToSend(self, now)

Generator. Returns the size of chunks to be requested (if any) to 'catch up' since last time this method was called.


Main loop.

resetTiming(self, now)

Resets the timing variable used to determine when the next time to send a request is.


Returns True if shutdown message received.


Got a problem with the documentation? Something unclear that could be clearer? Want to help improve it? Constructive criticism is very welcome - especially if you can suggest a better rewording!

Please leave you feedback here in reply to the documentation thread in the Kamaelia blog.

-- Automatic documentation generator, 05 Jun 2009 at 03:01:38 UTC/GMT

Kamaelia is an open source project originated from and guided by BBC Research. For more information browse the site or get in contact.

This is an ongoing community based development site. As a result the contents of this page is the opinions of the contributors of the pages involved not the organisations involved. Specificially, this page may contain personal views which are not the views of the BBC. (the site is powered by a wiki engine)

(C) Copyright 2008 Kamaelia Contributors, including the British Broadcasting Corporation, All Rights Reserved.

This web site is powered by the same code created for the bicker manor project. For more details, contact Michael Sparks at BBC Research directly (cf contact)