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orientdb-gremlin

Apache TinkerPop 3 Graph Structure Implementation for OrientDB. This started off as just a proof of concept, but thanks to a lot of help it's now in a really good shape and it has been officially adopted by OrientDB Team to be part of OrientDB v3.x.

The main area that need some more work is index lookups - currently it does find the right index for a simple case, e.g. g.V.hasLabel("myLabel").has("someKey", "someValue"). However if there are multiple indexes on the same property, or if there the traversal should better use a composite index, that's not handled well yet. If you feel inclined you can add these cases to the OrientGraphIndexTest.java. The function that looks up indexes is OrientGraphStep.findIndex.

Tests

• you can run the standard Apache TinkerPop test suite with mvn install -P release
• there are some additional tests that you can run independently with mvn test
• additionally there is a separate suite of tests in the tests-scala directory which you can run using sbt test
• to automatically format the code (travis CI enforces a format check), just run mvn clean install

Usage

Have a look at the tests-scala which demonstrates the usage. There's also an orientdb example project in gremlin-scala-examples.

Labels and classes

Vertices and Edges are stored as classes based on their label. In order to allow vertices and edges to use the same label, the implementation prepends V_ or E_ in the class name:

• vertex with label user -> classname V_user
• edge with label user -> classname E_user

Migrations

You might want to use orientdb-migrations to create a schema with indexes etc.

Release

• upgrade version: remove SNAPSHOT (driver/pom.xml and tests-scala/build.sbt)
• commit on branch, push, create PR on github
• await green light from travis
• merge PR on github
• mvn pull
• mvn clean deploy -Prelease
• git tag VERSION
• bump versions to next SNAPSHOT (pom.xml, build.sbt)
• git push
• git push --tags