yggdrasil v3.2.2 Yggdrasil.Publisher.Adapter.Postgres View Source

Yggdrasil publisher adapter for Postgres. The name of the channel must be a binary e.g:

Subscription to channel:

iex(1)> alias Yggdrasil.Channel
iex(2)> sub_channel = %Channel{
...(2)>   name: "postgres_channel",
...(2)>   adapter: Yggdrasil.Subscriber.Adapter.Postgres
...(2)> }
iex(3)> Yggdrasil.subscribe(sub_channel)
:ok
iex(4)> flush()
{:Y_CONNECTED, %Channel{name: "postgres_channel", (...)}}

Publishing message:

iex(5)> pub_channel = %Channel{
...(5)>   name: "postgres_channel",
...(5)>   adapter: Yggdrasil.Publisher.Adapter.Postgres
...(5)> }
iex(6)> Yggdrasil.publish(pub_channel, "message")
:ok

Subscriber receiving message:

iex(7)> flush()
{:Y_EVENT, %Channel{name: "postgres_channel", (...)}, "message"}

Instead of having sub_channel and pub_channel, the hibrid channel can be used. For the previous example we can do the following:

iex(1)> alias Yggdrasil.Channel
iex(2)> channel = %Channel{name: "postgres_channel", adapter: :postgres}
iex(3)> Yggdrasil.subscribe(channel)
:ok
iex(4)> flush()
{:Y_CONNECTED, %Channel{name: "postgres_channel", (...)}}
iex(5)> Yggdrasil.publish(channel, "message")
:ok
iex(6)> flush()
{:Y_EVENT, %Channel{name: "postgres_channel", (...)}, "message"} 

Link to this section Summary

Functions

Publishes a message in a channel using a publisher

Starts a Postgres publisher with a namespace. Additianally you can add GenServer options

Stops a Postgres publisher

Link to this section Functions

Link to this function publish(publisher, channel, message) View Source

Publishes a message in a channel using a publisher.

Link to this function start_link(namespace, options \\ []) View Source

Starts a Postgres publisher with a namespace. Additianally you can add GenServer options.

Stops a Postgres publisher.