Retrieves a block of data using a range request. A modification time
can be specified for the retrieval to fail if the requested file
modification time changed.
The data is returned as a block by triggering the deferred returned by
calling the retrieve method.
It can recover request failures up to MAX_RESUME_COUNT times.
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Inherited from common.StreamConsumer :
onInfo
Inherited from extern.log.log.Loggable :
__providedBy__ ,
__provides__ ,
debug ,
doLog ,
error ,
info ,
log ,
logFunction ,
logObjectName ,
warning ,
warningFailure ,
writeMarker
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