Below is a list of the subscription adapters available for end users.
##### Async Adapter
The async adapter is intended for development/testing and should not be used in production.
##### Redis Adapter
The Redis & Evented Redis adapters require a url pointing to the Redis server. Additionally,
a channel_prefix may be provided to avoid channel name collisions when using the same Redis server.
server for multiple applications. See the [Redis PubSub documentation](https://redis.io/topics/pubsub#database-amp-scoping) for more details.
See the
[Dependencies](#dependencies) section for additional information on adapters.
Action Cable contains two Redis adapters: "normal" Redis and Evented Redis. Both
of the adapters require users to provide a URL pointing to the Redis server.
Additionally, a channel_prefix may be provided to avoid channel name collisions
when using the same Redis server for multiple applications. See the [Redis PubSub documentation](https://redis.io/topics/pubsub#database-amp-scoping) for more details.
##### PostgreSQL adapter
##### PostgreSQL Adapter
The postgres adapter will use the ActiveRecord connection pool for it's connection. This may change in the future. [#27214](https://github.com/rails/rails/issues/27214)
The PostgreSQL adapter uses Active Record's connection pool, and thus the
application's `config/database.yml` database configuration, for its connection.
This may change in the future. [#27214](https://github.com/rails/rails/issues/27214)
