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Example graph:
__________
/ \ \
A B ---- C --->
\___/______/
has syntax in a pipeline definition:
"graph": [
"(A B (A.a_out_1: b_in_1 A.a_out_2: b_in_2) C (A.a_out_1: c_in_1 B.b_out_1: c_in_2 A.a_out_2: c_in_3))"
],
Note that output names must be fully-qualified, e.g. "B.b_out_1" instead
of "b_out_1". This is due to the graph traversal not yet handling edges
defined between B and C in the example graph, only between A and B, and
between A and C.
PipelineImpl posts to the listening response_queue and/or response_topic when the stream is destroyed. A stream creator might pass a queue_response or topic response when calling create_stream(), so it can be notified as frames are processed. If a stream exits due to an error in process_frame then these listeners will be notified, but if the stream exits without error then the listeners will not previously be notified.
MAINTENANCE: remove unused dependency
destroy_stream() in an error condition Currently when an error is raised, _process_stream_event() will call destroy_stream() directly so that the stream is immediately terminated and cleaned up. However, _process_stream_event() releases stream.lock before calling destroy_stream(), allowing another thread to update stream.state before destroy_stream() can stop and clean-up the stream, meaning that stream.state cannot be used to signal that an error condition has occurred.
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