Are there any CommandGateway usage examples?

Imported from Google Groups
1

I’ve gathered from the docs that this is the preferred approach but it appears that all of the examples use the COmmandBus directly.

2

If you use Spring:


Otherwise:

CommandGateway commandGateway = new DefaultCommandGateway(commandBus);

You can also use your own interface.
In Spring:



Or:
GatewayProxyFactory factory = new GatewayProxyFactory(commandBus);

MyGatewayInterface gateway = factory.createGateway(MyGatewayInterface.class);

Cheers,

Allard

3

When should I use a CommandBus and when should I use a CommandGateway ? Any guidelines or best practices ?

4

You should use a CommandGateway if you like to have a simpler API towards the Command Bus. The gateway also allows you to configure a “retry-mechanism” which resends a command when it fails under certain conditions.

Otherwise, both approaches are very much the same. It’s just a different API, where the CommandBus requires you to wrap a Command object in a CommandMessage, and the Gateway doesn’t.

Cheers,

Allard