SpringCloudCommandRouter requires local @CommandHandler to function properly

[travikk]

Hey there!

I noticed that if a service wants to use DistributedCommandBus with SpringCloudCommandRouter it's not really possible to do so. SpringCloudCommandRouter will throw a
new IllegalStateException("There should be no scenario where the local member does not exist."
when there haven't been any local member (which would happen when subscribing for a local @CommandHandler?).

It is a perfectly valid scenario that a service would like to dispatch a method to another one, whilst it itself doesn't have any command handlers.

There's no obvious workaround currently, as things are declared as private, so can't really override stuff without copy-pasting the whole class.

Thanks for your help!

[abuijze]

Hi @travikk,

you did hit a little issue there, it seems. The problem is that a local instance is only configured once the loadFactor and/or CommandMessageFilter for the local node is registered. The default command message filter is a DenyAll, which basically means it doesn't accept any commands. Since that's the default, no changes are made.

While we'll fix this, as a workaround, you could configure an explicit loadFactor on the DistributedCommandBus to trigger this registration. The loadFactor may be 0.

[travikk]

Thanks for replying!

Thanks for the suggestion on the workaround. Will try it, as currently I had setup a simple handler for a dummy command.

[smcvb]

Closing as this issue has been resolved in commit eefbbac.