| Class | Description | 
|---|---|
| AbstractVerticle | |
| Context | The execution context of a  Handlerexecution. | 
| MultiMap | This class represents a MultiMap of String keys to a List of String values. | 
| Promise<T> | Represents the writable side of an action that may, or may not, have occurred yet. | 
| RxHelper | A set of helpers for RxJava and Vert.x. | 
| TimeoutStream | A timeout stream is triggered by a timer, the  Handlerwill be call when the timer is fired,
 it can be once or several times depending on the nature of the timer related to this stream. | 
| Vertx | The entry point into the Vert.x Core API. | 
| WorkerExecutor | An executor for executing blocking code in Vert.x . | 
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