I want to have multiple buses with different features. Example of different buses might be:

Default bus

• Allows zero or more handlers
• Supports both sync and async
• Return values are optional

Command bus

• Exactly one handler required
• Supports both sync and async
• No return values from handlers

Event bus

• Allows zero or more handlers
• Supports both sync and async
• No return values from handlers

Query bus

• Exactly one handler required
• Supports only sync
• Return values required

Example config:

framework:
  messenger:
    middlewares: ~ # default middlewares
    bus_foo:
      type: foo
      routing:
        'App\Bar': ['sender.bar', 'sender.biz']
        'App\Foo': 'sender.foo'
      middlewares:  # bus specific middlewares
        - 'custom_service'
        - validation: true