Complex Event Processing: IT Liberator or Over-Engineering Hell?

 
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Old 08-01-2010
Complex Event Processing: IT Liberator or Over-Engineering Hell?

by Adrian Bridgwater, Dr. Dobbs Before getting down to technical details, I’d like to ask whether the future position of Complex Event Processing (CEP) tools and engines spells good news or bodes ill for our technology future. Specifically, I’d like to question whether CEP represents a highly agile customer-influenced IT delivery driver, or whether CEP [...]

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GStreamer::Event(3pm)					User Contributed Perl Documentation				     GStreamer::Event(3pm)

NAME
GStreamer::Event - Structure describing events that are passed up and down a pipeline DESCRIPTION
The various event types are represented as subclasses: GStreamer::Event::FlushStart GStreamer::Event::FlushStop GStreamer::Event::EOS GStreamer::Event::NewSegment GStreamer::Event::Tag GStreamer::Event::BufferSize GStreamer::Event::QOS GStreamer::Event::Seek GStreamer::Event::Navigation GStreamer::Event::Custom::UP GStreamer::Event::Custom::DS GStreamer::Event::Custom::DS::OOB GStreamer::Event::Custom::Both GStreamer::Event::Custom::Both::OOB To create a new event, you call the constructor of the corresponding class. To check if an event is of a certain type, use the type method: if ($event -> type eq "newsegment") { # ... } elsif ($event -> type eq "eos") { # ... } To get to the content of an event, call the corresponding accessor: if ($event -> type eq "newsegment") { my $update = $event -> update; my $rate = $event -> rate; my $format = $event -> format; my $start_value = $event -> start_value; my $stop_value = $event -> stop_value; my $stream_time = $event -> stream_time; # ... } elsif ($event -> type eq "tag") { my $tag = $event -> tag; # ... } METHODS
structure = $event->get_structure eventtype = $event->type ENUMS AND FLAGS
enum GStreamer::EventType o 'unknown' / 'GST_EVENT_UNKNOWN' o 'flush-start' / 'GST_EVENT_FLUSH_START' o 'flush-stop' / 'GST_EVENT_FLUSH_STOP' o 'eos' / 'GST_EVENT_EOS' o 'newsegment' / 'GST_EVENT_NEWSEGMENT' o 'tag' / 'GST_EVENT_TAG' o 'buffersize' / 'GST_EVENT_BUFFERSIZE' o 'sink-message' / 'GST_EVENT_SINK_MESSAGE' o 'qos' / 'GST_EVENT_QOS' o 'seek' / 'GST_EVENT_SEEK' o 'navigation' / 'GST_EVENT_NAVIGATION' o 'latency' / 'GST_EVENT_LATENCY' o 'step' / 'GST_EVENT_STEP' o 'custom-upstream' / 'GST_EVENT_CUSTOM_UPSTREAM' o 'custom-downstream' / 'GST_EVENT_CUSTOM_DOWNSTREAM' o 'custom-downstream-oob' / 'GST_EVENT_CUSTOM_DOWNSTREAM_OOB' o 'custom-both' / 'GST_EVENT_CUSTOM_BOTH' o 'custom-both-oob' / 'GST_EVENT_CUSTOM_BOTH_OOB' SEE ALSO
GStreamer COPYRIGHT
Copyright (C) 2005-2011 by the gtk2-perl team. This software is licensed under the LGPL. See GStreamer for a full notice. perl v5.14.2 2012-03-01 GStreamer::Event(3pm)