Adaptive Overlays for Shared Stream Processing Environments

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10-07-2008

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Adaptive Overlays for Shared Stream Processing Environments

HPL-2007-178 (R.1) Adaptive Overlays for Shared Stream Processing Environments - Papaemmanouil, Olga; Basu, Sujoy; Banerjee, Sujata
Keyword(s): stream processing, overlay, quality-of-service
Abstract: Large-scale overlays has become a powerful paradigm for deploying stream processing applications in wide-area environments. The dynamic nature of these systems makes it difficult to guarantee the Quality of Service (QoS) requirements of each application. In this work we present a framework for distr ...
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data::stream::bulk::doneflag

Data::Stream::Bulk::DoneFlag(3pm)			User Contributed Perl Documentation			 Data::Stream::Bulk::DoneFlag(3pm)

NAME

       Data::Stream::Bulk::DoneFlag - Implement the "is_done" method in terms of a flag

VERSION

       version 0.11

SYNOPSIS

	       package Data::Stream::Bulk::Blah;
	       use Moose;

	       with qw(Data::Stream::Bulk::DoneFlag);

	       sub get_more {
		       if ( my @more = more() ) {
			       return @more;
		       } else {
			       return;
		       }
	       }

DESCRIPTION

       This role implements the "Data::Stream::Bulk" core API in terms of one method ("get_more").

       As a convenience it calls "finished" when the stream is exhausted, so that cleanup may be done.

       This is used by classes like Data::Stream::Bulk::DBI, Data::Stream::Bulk::Callback.

METHODS

       is_done
	   Returns the state of the iterator.

       next
	   As long as the iterator is not yet done, calls "get_more".

	   If "get_more" returned a false value instead of an array reference then "done" is set, "finished" is called, and this "next" does
	   nothing on subsequent calls.

       finished
	   A noop by default. Can be overridden if so desired.

REQUIRED_METHODS
       get_more
	   Returns the next block of data as an array ref, or a false value if no items are left.

AUTHOR

       Yuval Kogman <nothingmuch@woobling.org>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2012 by Yuval Kogman.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

perl v5.14.2							    2012-02-14					 Data::Stream::Bulk::DoneFlag(3pm)

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