Overview

PGMQ is a lightweight message queue built on top of PostgreSQL — no extra infrastructure, just your existing database. Keep It Simple Stupid, use postgres.

pgmq4s (codename: Dutchie) is a Scala 3 client for PGMQ, supporting JVM, Scala.js, and Scala Native.

Requires PGMQ v1.11.0+ (topic-based routing). Core messaging works with v1.10.0.

Features

• Effect-agnostic — tagless final PgmqClient[F] and PgmqAdmin[F] with no required effect dependency; bring your own via PgmqEffect[F], with a Future instance built in and a Cats adapter (pgmq4s-cats) for Cats Effect
• Multiple backends — Doobie, Skunk, Anorm, Slick
• Multiple JSON codecs — Circe, Jsoniter-scala, uPickle, Play JSON, Spray JSON
• Cross-platform — Skunk backend + Circe/Jsoniter/uPickle codecs work on JVM, JS, and Native

Work-in-progress 🚧

• Streaming (fs2)
• Native ZIO support (Quill)
• Native kyo support (kyo-sql)