Gremlin Graph Traversal: Serialisation

[jacobusl...@gmail.com]

Hi all,

I am currently using both GraphSON and Gryo to serialise/deserialise a graph. Is it possible to serialise/deserialise a graph traversal? I am catering for a very specific use case, where the graph traversal is generated in Java and should be sent to a Gremlin console.

For example, the bytecode of a specific traversal may look as follows: 

Bytecode traversalByteCode = traversal.asAdmin().getBytecode();
-> [[], [V()]]

How would I go about serialising the Bytecode in Java and Deserialising in Gremlin Console, so that I can ultimately execute the following script:

gremlin> x = JavaTranslator.of(g).translate(bytecodeFromJava);

ADDITIONAL: This is a long shot but does anybody know of a translator that translates Gremlin Machine Traversal Language back into Gremlin, i.e., [GraphStep(vertex,[])] to g.V()

Thank you.

Regards,

Jacobus 

[Stephen Mallette]

You can just create a jackson ObjectMapper and pass the traversal bytecode to it:

gremlin> mapper = GraphSONMapper.build().create().createMapper()

==>org.apache.tinkerpop.shaded.jackson.databind.ObjectMapper@45f24169

gremlin> mapper.writeValueAsString(g.V().out().bytecode)

==>{"sourceInstructions":[],"stepInstructions":[{"operator":"V","arguments":[]},{"operator":"out","arguments":[]}],"bindings":{},"instructions":[{"operator":"V","arguments":[]},{"operator":"out","arguments":[]}]}

You could also do something similar with GryoMapper.

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[Stephen Mallette]

sorry - forgot to address this:

>  This is a long shot but does anybody know of a translator that translates Gremlin Machine Traversal Language back into Gremlin, i.e., [GraphStep(vertex,[])] to g.V()

There is no translation for that. That is just a toString() representation of the steps for basic readability.

[jacobusl...@gmail.com]

Thank you for the reply Stephen, ultimately what I would like to do is send bytecode from Java via REST to the gremlin-server. Is there no way to serialise the Bytecode (can be transferred as a String)?

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[Stephen Mallette]

REST does not support bytecode as an input....only Gremlin script strings.

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[jacobusl...@gmail.com]

Yes, I was curious if I wasn't missing a serialiser somewhere. Thanks for your input :)