| Class | Description | 
|---|---|
| DeliveryContext<T> | Encapsulates a message being delivered by Vert.x as well as providing control over the message delivery. | 
| EventBus | A Vert.x event-bus is a light-weight distributed messaging system which allows different parts of your application,
 or different applications and services to communicate with each in a loosely coupled way. | 
| Message<T> | Represents a message that is received from the event bus in a handler. | 
| MessageConsumer<T> | An event bus consumer object representing a stream of message to an  EventBusaddress that can
 be read from. | 
| MessageProducer<T> | Represents a stream of message that can be written to. | 
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