Serializing basic gremlin queries

[Mark Melling]

Hi,

I would like to be able serialize some basic gremlin queries (nothing too elaborate), so that they can be stored to file, retrieved and re-run. 

Is there a standard way of doing this, and if so how? Or is this something just not done!

Thanks

Mark

 

[Stephen Mallette]

It can be done a couple of ways:

1. Store it as a string and then just use GremlinGroovyScriptEngine to eval() it as a script

2. Store it as bytecode serialized to GraphSON then rehydrate it back to a traversal with JavaTranslator

The second option requires a bit more explanation maybe:

gremlin> bytecode = g.V().has('name','marko').asAdmin().getBytecode()

==>[[], [V(), has(name, marko)]]

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

==>org.apache.tinkerpop.shaded.jackson.databind.ObjectMapper@1eaf1e62

gremlin> json = mapper.writeValueAsString(bytecode)

==>{"@type":"g:Bytecode","@value":{"step":[["V"],["has","name","marko"]]}}

gremlin> t = org.apache.tinkerpop.gremlin.jsr223.JavaTranslator.of(g).translate(mapper.readValue(json,Bytecode.class))

==>v[1]

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[Kelvin Lawrence]

Hi Mark, you can save the results of a console session to a file and reload it later using the :load command.

Here is an example taken from my tutorial:

gremlin> :record start mylog.txt
Recording session to: "mylog.txt"

gremlin> g.V().count().next()
==>3618
gremlin> :record stop
Recording stopped; session saved as: "mylog.txt" (157 bytes)

This will create a file that looks like this

// OPENED: Tue Sep 12 10:43:40 CDT 2017 
// RESULT: mylog.txt 
g.V().count().next() 
// RESULT: 3618 :record stop 
// CLOSED: Tue Sep 12 10:43:50 CDT 2017

Here is a link to the part of the tutorial that covers this concept:

http://kelvinlawrence.net/book/Gremlin-Graph-Guide.html#gremlinsave
Hope this helps
Kelvin
Enter code here...

[Mark Melling]

Hi,

Thanks for the answers, I really appreciate it.

In my particular situation I think storing the bytecode serialized to GraphSON is the right approach.

Can I also take this opportunity to thank Kelvin for your really excellent tutorial, which I have started to work through.

Thanks

Mark

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[Kelvin Lawrence]

Thanks Mark - glad you got a good solution to your problem. This community is awesome and really responsive!

I have opened an issue against myself to add coverage of Gremlin ByteCode to the book. Just need to find the time :-)

Cheers

Kelvin