Clément de Groc created TINKERPOP-2523:
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Summary: Allow registration of listeners for traversal iteration
begin/end events
Key: TINKERPOP-2523
URL: https://issues.apache.org/jira/browse/TINKERPOP-2523
Project: TinkerPop
Issue Type: Improvement
Components: server
Affects Versions: 3.4.10
Reporter: Clément de Groc
In order to improve observability/monitoring (e.g. distributed tracing, logging
of traversals requests), it would be nice if users could register custom
listeners for traversal iteration begin/end events.
Those begin/end events are actually already nicely exposed as protected methods
in
[TraversalOpProcessor|https://github.com/apache/tinkerpop/blob/master/gremlin-server/src/main/java/org/apache/tinkerpop/gremlin/server/op/traversal/TraversalOpProcessor.java#L262-L272].
Though, in 3.4.10, it is difficult to subclass TraversalOpProcessor to
override those methods as the
[OpLoader|https://github.com/apache/tinkerpop/blob/master/gremlin-server/src/main/java/org/apache/tinkerpop/gremlin/server/op/OpLoader.java#L47]
ensures only one OpProcessor can be loaded with name "traversal".
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