Original Survey on Event Processing Languages

 
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Old 11-19-2007
Original Survey on Event Processing Languages

Tim Bass
Mon, 19 Nov 2007 09:59:49 +0000
A few of us have been discussing*event processing languages (EPLs)*for a number of years, advocating*that SQL-like languages are appropriate for certain classes of CEP/EP problems, but not all.
Some*readers might recall that I published a draft survey on EPLs*to the Yahoo! CEP*Interest*group titled, (DRAFT) A Survey of Event Processing Languages (EPLs), October 15, 2006 (version 14).
A number of us CEP “grey beards” have consistently advocated that there are EPLs and analytics that are optimal for certain classes of event processing problems (and, in turn, there also are EPLs that are suboptimal for certain classes of event processing problems).
For readers who do not frequent the Yahoo! CEP group,*below here is*a link to a*copy of the original survey.



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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)