Using more than one erlang behaviour
I have an erlang gen_fsm process that talks to a remote server via tcp using erlang's built-in gen_tcp.
I would like to make this a web-socket client. Upon some investigation, I got this erlang websocket client library Erlang Websocket client.
looking at some examples, it looks like I have to use the
-behaviour(websocket_client_handler).
Basically, I do this in my start_link
start_link(UserID) ->
gen_fsm:start_link(?MODULE, [UserID], []).
However, the other behavior expects a different return values for the init and a different state. I already have a state for my gen_fsm.
Can someone throw some context around this.
I think it is nothing wrong in having two behaviors defined for the same module but given that each behavior requires different return types in the init/[1/2] functions, I start to think if this is really something feasible. Just wanted to reach out to someone experienced.
Thanks.
In principle, I don't think it's a problem: init/1 and init/2 are two completely different functions, gen_fsm:start_link will only call init/1 and websocket_client:start_link will only call init/2 . And of course, the state from gen_fsm 's callbacks won't be passed to websocket_client 's, so they can be completely different. In practice, I'd expect it to be really confusing.
Instead, I'd separate the websocket client into a separate module which is called from the gen_fsm (if I understood you correctly).
上一篇: 运行gen的最佳方式是什么？
下一篇: 使用多个erlang行为