Kamaelia.Protocol.Framing.DataDeChunker

class DataDeChunker(Axon.Component.component)

DataDeChunker([syncmessage]) -> new DataDeChunker component.

Synchronises to a stream of string data, delimited into chunks by a 'sync' sequence. Chunks are buffered until the next 'sync sequence is received and are then passed on.

Keyword arguments: - syncmessage - string to use as 'sync' sequence (default="XXXXXXXXXXXXXXXXXXXXXXXX")

Inboxes

• control : shutdown messages (producerFinished)
• inbox : partial message chunk strings
• flush : instructions to flush the internal buffer

Outboxes

• outbox : dechunked message strings
• signal : producerFinished shutdown messages

Methods defined here

__init__(self, syncmessage)

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

decodeChunk(self, chunk)

unEscape and return the chunk, sans the 'sync' sequence prefix, or raise IncompleteChunk if the chunk isn't prefixed with the 'sync' sequence (can't guarantee the chunk is whole).

main(self)

Main loop.

shouldFlush(self)

Returns non-zero if a message has been received on the "flush" inbox

shutdown(self)

Shutdown on producerFinished message arriving at "control" inbox.

unEscapeSyncMessage(self, message)

Returns message with escaped occurrences of the 'sync' message unescaped again.

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