Kamaelia.File.BetterReading

• component IntelligentFileReader

• Intelligent File Reader

Intelligent File Reader

This component reads the filename specified at its creation and outputs it as several messages. When a certain number of messages in its outbox have not yet been delivered it will pause to reduce memory and CPU usage. To wake it, ideally Axon should unpause it when the outbox has less than a certain number of messages (i.e. when some are delivered) but for now you can send it an arbitrary message (to "inbox") which will wake the component.

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Kamaelia.File.BetterReading.IntelligentFileReader

class IntelligentFileReader(Axon.Component.component)

IntelligentFileReader(filename, chunksize, maxqueue) -> file reading component

Creates a file reader component. Reads a chunk of chunksize bytes, using the Selector to avoid having to block, pausing when the length of its send-queue exceeds maxqueue chunks.

Inboxes

• control : for shutdown signalling
• inbox : wake me up by sending anything here
• _selectorready : ready to read

Outboxes

• debug : information designed to aid debugging
• outbox : data output
• signal : outputs 'producerFinished' after all data has been read
• _selectorask : ask the Selector to notify readiness to read on a file

Methods defined here

__init__(self, filename[, chunksize][, maxqueue])

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

debug(self, msg)

main(self)

Main loop

makeNonBlocking(self, fd)

openFile(self, filename)

selectorWait(self, fd)

tryReadChunk(self, fd)