Details
- Vendor
- thatDot
- Type
- Property Graph
- Category
- Emerging
- License
- MIT + Commons Clause
- Language
- Scala
- Query Languages
- openCypherGremlin
- Protocols
- HTTP/RESTWebSocket
Quine
A streaming graph engine written in Scala that ingests event streams and builds them into a stateful graph in real time. Uses standing queries to continuously match patterns and trigger actions as data arrives. Supports pluggable persistence via RocksDB, Cassandra, and ScyllaDB.
- Overall rank
- #45
- First released
- February 2022
- License
- MIT + Commons Clause
- Built with
- Scala
Details
Sources 5 references
Protocols HTTP/REST, WebSocket
Cypher and admin operations go through the /api/v2/ JSON REST API; a separate WebSocket standing-query wiretap (ws://{host}/api/v2/graph/{graph}/standingQueries/{name}:tap) streams live results but is explicitly marked experimental/unstable; accepted pass_A's WebSocket tag since the wiretap is a real, documented client-facing channel, not just an internal detail.
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This page describes the conventions every endpoint shares — URL shape, request and response format, error envelope, and common query parameters.
REST API - Streaming Graph for Data Pipelines · reviewed 2026-08-02 -
The standing query wiretap enables observing a standing query's results in real time over a WebSocket connection.
Standing Query Wiretap - Streaming Graph for Data Pipelines · reviewed 2026-08-02
License MIT + Commons Clause
Confirmed directly from the repository's LICENSE file. SPDX has no combined identifier for MIT-plus-Commons-Clause, so the value follows the catalogue's existing convention; the permissive MIT grant is restricted by the Commons Clause condition, which forbids selling or commercially hosting the software.
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MIT License with Commons Clause Copyright © 2014 Ryan Wright; © 2019 thatDot, Inc.
thatdot/quine LICENSE · reviewed 2026-08-02
Released 2022-02
Confirmed via thatDot's own announcement of Quine's public open-source release; matches the current catalogue value.
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We at thatDot are pleased to announce that today the release of Quine, our streaming graph for event processing, as an open source project.
Announcing Open Source Release of Quine Streaming Graph · reviewed 2026-08-02
Language Scala
Confirmed; no change from current value.
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Quine is written in Scala and released as open source.
Download - Streaming Graph for Data Pipelines · reviewed 2026-08-02