How can I know there are the id rooms?

[MrChebik]

I need to check, if id created this room to join them.

[mslosarz]

There are two ways to create conversation. You can use join (when conversation wasn't exists then new one will be created), or use create (then you'll receive created signal with room id in signal content). If you want, you can write your own signal which will check if conversation with given name exists (details here)

[MrChebik]

Thank you for quick reply.

So, I have this: https://pastebin.com/Nm5QyRar
And when I try to run, I get exception:

Invalid factory method 'addCustomJoinHandler': needs to have a non-void return type!

[mslosarz]

my mistake, return for example signal instead of void then spring context will be able to start.
I fixed documentation :)

[mslosarz]

You could autowire org.nextrtc.signalingserver.repository.Conversations. This repository has method Optional findBy(String conversationId). You can use them to check if conversation exists or not

[MrChebik]

Thank you.

But what to do, if I get NullPointerException?

resolver.addCustomHandler(Signal.fromString("join_exist"), (msg) ->
            InternalMessage.create()
                    .to(msg.getFrom())
                    .content(conversations.findBy(msg.getContent()) == null ? msg.getContent() : "NOT_CREATED")
                    .build()
                    .send()
        );

I want to check, if conversation is exist.
I check message and if this not equals NOT_CREATED, I join to this room.

Hmm...
I don't use Signal. Now, I use Signal.EMPTY and this works.

[MrChebik]

You are the best!
Thank you for this library!!!