cayley

README

Cayley is an open-source graph inspired by the graph database behind [Freebase](http://freebase.com) and Google's [Knowledge Graph](https://en.wikipedia.org/wiki/Knowledge_Graph).

Its goal is to be a part of the developer's toolbox where Linked Data and graph-shaped data (semantic webs, social networks, etc) in general are concerned.

Features

• Community driven
• Written in Go
  • can be used as a Go library
• Easy to get running (3 or 4 commands, below)
• RESTful API
  • or a REPL if you prefer
• Built-in query editor and visualizer
• Multiple query languages:
  • JavaScript, with a Gremlin-inspired* graph object.
  • (simplified) MQL, for Freebase fans
• Plays well with multiple backend stores:
  • LevelDB
  • Bolt
  • PostgreSQL
  • MongoDB for distributed stores
  • In-memory, ephemeral
• Modular design; easy to extend with new languages and backends
• Good test coverage
• Speed, where possible.

Rough performance testing shows that, on 2014 consumer hardware and an average disk, 134m quads in LevelDB is no problem and a multi-hop intersection query -- films starring X and Y -- takes ~150ms.

Community

• Website: cayley.io
• Discourse list: discourse.cayley.io (Also acts as mailing list, enable mailing list mode)
• Twitter: @cayleygraph
• IRC: #cayley on Freenode

Documentation

• See the docs folder

Documentation

Index

• Variables
• func Quad(subject, predicate, object, label interface{}) quad.Quad
• func Triple(subject, predicate, object interface{}) quad.Quad
• type Handle
  • func NewGraph(name, dbpath string, opts graph.Options) (*Handle, error)
  • func NewMemoryGraph() (*Handle, error)
  • func (h *Handle) Close()
• type Iterator
• type Path
• type QuadStore
• type QuadWriter

Variables

var (
	StartMorphism = path.StartMorphism
	StartPath     = path.StartPath

	NewTransaction = graph.NewTransaction
)

Functions

func Quad

func Quad(subject, predicate, object, label interface{}) quad.Quad

func Triple

func Triple(subject, predicate, object interface{}) quad.Quad

Types

type Handle

type Handle struct {
	graph.QuadStore
	graph.QuadWriter
}

func NewGraph

func NewGraph(name, dbpath string, opts graph.Options) (*Handle, error)

func NewMemoryGraph

func NewMemoryGraph() (*Handle, error)

func (*Handle) Close

func (h *Handle) Close()

type Iterator

type Iterator graph.Iterator

type Path

type Path path.Path

type QuadStore

type QuadStore graph.QuadStore

type QuadWriter

type QuadWriter graph.QuadWriter