Gremlin (programming language)
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| Designed by | Marko A. Rodriguez |
|---|---|
| Developer | Apache TinkerPop of the Apache Software Foundation |
| First appeared | 2009 |
| Stable release |
Gremlin 3.2.3
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| OS | Cross-platform (multi-platform) |
| License | Apache License |
| Website | Official Site |
| Dialects | |
| Gremlin-Java8, Gremlin-Groovy, Gremlin-Python, Gremlin-Scala, Gremlin-Clojure, Gremlin-PHP, Gremlin-JavaScript, Gremlin-Typeset | |
| Influenced by | |
| Regular expression, XPath, Ripple, SPARQL, SQL, Java/JVM | |
Gremlin is a graph traversal language and virtual machine developed by Apache TinkerPop of the Apache Software Foundation. Gremlin works for both OLTP-based graph databases as well as OLAP-based graph processors. Gremlin's automata and functional language foundation enable Gremlin to naturally support imperative and declarative querying, host language agnosticism, user-defined domain specific languages, an extensible compiler/optimizer, single- and multi-machine execution models, hybrid depth- and breadth-first evaluation, as well as Turing Completeness.
As an explanatory analogy, Apache TinkerPop and Gremlin are to graph databases what the JDBC and SQL are to relational databases. Likewise, the Gremlin traversal machine is to graph computing as what the Java virtual machine is to general purpose computing.
Gremlin is an Apache2-licensed graph traversal language that can be used by graph system vendors. There are typically two types of graph system vendors: OLTP graph databases and OLAP graph processors. The table below outlines those graph vendors that support Gremlin.
The following examples of Gremlin queries and responses in a Gremlin-Groovy environment are relative to a graph representation of the MovieLens dataset. The dataset includes users who rate movies. Users each have one occupation, and each movie has one or more categories associated with it. The MovieLens graph schema is detailed below.
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