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Posted to dev@tinkerpop.apache.org by "Florian G (Jira)" <ji...@apache.org> on 2022/02/23 13:34:00 UTC

[jira] [Created] (TINKERPOP-2712) PropertyChangedEvent is triggered before Property is actually changed

Florian G created TINKERPOP-2712:
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             Summary: PropertyChangedEvent is triggered before Property is actually changed
                 Key: TINKERPOP-2712
                 URL: https://issues.apache.org/jira/browse/TINKERPOP-2712
             Project: TinkerPop
          Issue Type: Bug
          Components: process
    Affects Versions: 3.5.2
            Reporter: Florian G


[Event|https://github.com/apache/tinkerpop/blob/master/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/util/event/Event.java]s are triggered when the graph changes, including additions and deletions.

In my understanding, all events are triggered at a point in time where the modified element is either still present in the graph (i.e. right before removal) or already present in the graph (i.e. right after insertion).

As can be seen in [DropStep|https://github.com/apache/tinkerpop/blob/7f7d3a485c7f100f98047b71672a0c2c9ab855b4/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/filter/DropStep.java], [AddVertexStep|https://github.com/apache/tinkerpop/blob/master/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/AddVertexStep.java], [AddVertexStartStep|https://github.com/apache/tinkerpop/blob/master/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/AddVertexStartStep.java], [AddEdgeStep|https://github.com/apache/tinkerpop/blob/master/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/AddEdgeStep.java] and [AddEdgeStartStep|https://github.com/apache/tinkerpop/blob/master/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/AddEdgeStartStep.java], this observation holds true. However, [AddPropertyStep|https://github.com/apache/tinkerpop/blob/master/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/AddPropertyStep.java] breaks this rule and triggers the event before the property is available in the graph.

This causes issues whenever users want to perform further actions on recently added elements, as vertices and edges are present in the graph, while properties are not.



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