Qpid Erlang模块

Question

I am newbie to erlang but managed to get the ActiveMQ talking to my erlang shell using qpid pronton c library as, which is working well and i am getting messages from queue itself on my erlang shell and vice versa.

qpidpn:subscribe("amqp://localhost/topic://xxx").
qpidpn:publish(#{address => "amqp://127.0.0.1/topic://xxx", body => "hello"}).

Now, i want to implement the same above stated code using .erl file with some function getting invoked everytime we have new message on the queue and i can take further action of returning the same to origin.

Answer 1

You can implement gen_server, as seems the messages are coming from some MQ. So, you can get the messages in handle_info. Once there you can do whatever you want to do with them.

Answer 2

Well, it all depends on how your subscriber is implemented (is it another process, TCP listener, do you use gen_event behaviour, does it decode any data for you .... ).

Since you are using AMQP protocol for communication, you could use RabbitMQ as client. You would get whole AMQP implementation (with all responses to your broker), and some model for getting messages or subscribing to channels. Code-base is mature, whole project is stable, and most of logic is written for you, so I would strongly recommend using this approach.

The "invoked everytime we have new message on the queue" is somewhat explained in subscibe to que section.