CODEWITHSUNDEEP
javaspringrestneo4jgraph-traversal
praveen gottam
praveen gottam

Reputation: 43

Rest Traversal Neo4j java.lang.UnsupportedOperationException

This is my first application on neo4j, i like to use the traversal API for better performance and the ease of use, however i was stumped when i looked at the rest traversal most of the operations are not implemented, i am using spring-data-neo4j-rest ( 3.1.2) neo4j kernal and core version os 2.0 Ex. from Resttraversal Src ( only two evaluators are implemented) Am i using the right version if not which version supports more of this one

 public RestTraversalDescription evaluator(PathEvaluator evaluator) {
        if (evaluator == Evaluators.all()) return add("return_filter",toMap("language","builtin", "name","all"));
        if (evaluator == Evaluators.excludeStartPosition()) return add("return_filter",toMap("language","builtin", "name","all_but_start_node"));
        throw new UnsupportedOperationException("Only builtin paths supported");
    }


 @Override
    public TraversalDescription expand(PathExpander<?> expander) {
        throw new UnsupportedOperationException();
    }

    @Override
    public <STATE> TraversalDescription expand(PathExpander<STATE> expander, InitialStateFactory<STATE> initialState) {
        throw new UnsupportedOperationException();
    }

NEED HELP and i feel i wasted more than a day browsing for solution....

Upvotes: 1

Views: 308

Answers (2)

praveen gottam
praveen gottam

Reputation: 43

Since i upgraded to Neo4j 2.3, i used cypher as part of the unmanaged extension. Seems working efficiently now also achieving the pattern matching flexibility that cypher provides

Upvotes: 0

Stefan Armbruster
Stefan Armbruster

Reputation: 39925

The recommended way to get maximum performance for your traversals would be to use unmanaged extensions that internally use the Traversal API.

You bascially write a Java (or Groovy/Clojure/Scala/... ) class using JAX-RS annotations. Your code gets packaged as a jar and deployed to Neo4j's plugins directory. The annotated methods become new REST endpoints to your Neo4j server.

REST traversals as you intended to use them are a rather old and not widely used feature within the product.

Upvotes: 1

Related Questions