Re: [TinkerPop] VertexQuery in Tinkerpop3

[Stephen Mallette]

Graph Providers will typically write TraversalStrategy implementations to optimize traversals:

http://tinkerpop.apache.org/docs/current/reference/#traversalstrategy

You can see TinkerGraph for an example:

https://github.com/apache/tinkerpop/blob/b2866d453b1ec62566c2b588dd12875bf55abbd7/tinkergraph-gremlin/src/main/java/org/apache/tinkerpop/gremlin/tinkergraph/process/traversal/strategy/optimization/TinkerGraphStepStrategy.java

Note how it replaces the GraphStep with a TinkerGraphStep which basically enables TinkerGraph's indexing to work (i.e. take has() in the traversal and use its property for an index). You found TinkerCountGlobalStep - note that this step gets injected by a separate strategy called TinkerGraphCountStrategy:

https://github.com/apache/tinkerpop/blob/b2866d453b1ec62566c2b588dd12875bf55abbd7/tinkergraph-gremlin/src/main/java/org/apache/tinkerpop/gremlin/tinkergraph/process/traversal/strategy/optimization/TinkerGraphCountStrategy.java

If you have specific questions for how strategies work or how to do a particular optimization please let us know.

On Thu, Jan 12, 2017 at 1:45 PM, NQuinn <nickqu...@gmail.com> wrote:

Previously, in Tinkerpop2, we were overriding VertexQuery to implement some optimized functionality. Now that we are working with Tinkerpop3, we are trying to figure out how to re-implement the same functionality in an AbstractStep. I am not sure how to retrieve the same information: vertex, edge labels, and direction from the previous path steps. I found the TinkerCountGlobalStep in the Apache Tinkerpop repo, but it doesn't seem to use this information.  Can you give me some advice?  Thanks so much! 

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