Converting gremlin query from gremlin console to Bytecode

Question

I am trying to convert gremlin query received from gremlin console to bytecode in order to extract StepInstructions. I am using the below code to do that but it looks hacky and ugly to me. Is there any better way of converting gremlin query from gremlin console to Bytecode?

String query = (String) requestMessage.getArgs().get(Tokens.ARGS_GREMLIN);
final GremlinGroovyScriptEngine engine = new GremlinGroovyScriptEngine();
CompiledScript compiledScript = engine.compile(query);

final Graph graph = EmptyGraph.instance();
final GraphTraversalSource g = graph.traversal();

final Bindings bindings = engine.createBindings();
bindings.put("g", g);

DefaultGraphTraversal graphTraversal = (DefaultGraphTraversal) compiledScript.eval(bindings);

Bytecode bytecode = graphTraversal.getBytecode();

Brock Shelton · Accepted Answer · 2020-10-01 19:51:33Z

2

If you need to take a Gremlin string and convert it to Bytecode I don't think there is a much better way to do that. You must pass the string through a GremlinGroovyScriptEngine to evaluate it into an actual Traversal object that you can manipulate. The only improvement that I can think of would be to call eval() more directly:

// construct all of this once and re-use it for your application
final GremlinGroovyScriptEngine engine = new GremlinGroovyScriptEngine();
final Graph graph = EmptyGraph.instance();
final GraphTraversalSource g = graph.traversal();
final Bindings bindings = engine.createBindings();
bindings.put("g", g);

//////////////

String query = (String) requestMessage.getArgs().get(Tokens.ARGS_GREMLIN);
DefaultGraphTraversal graphTraversal = (DefaultGraphTraversal) engine.eval(query, bindings);    
Bytecode bytecode = graphTraversal.getBytecode();

edited Oct 1, 2020 at 19:51

Brock Shelton

31 bronze badge

answered Jul 8, 2020 at 11:08

stephen mallette

46.3k5 gold badges70 silver badges137 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Converting gremlin query from gremlin console to Bytecode

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related