| Interface | Description | 
|---|---|
| AsyncResult<T> | Encapsulates the result of an asynchronous operation. | 
| Closeable | A closeable resource. | 
| CompositeFuture | The composite future wraps a list of  futures, it is useful when several futures
 needs to be coordinated. | 
| Context | The execution context of a  Handlerexecution. | 
| Future<T> | Represents the result of an action that may, or may not, have occurred yet. | 
| Handler<E> | A generic event handler. | 
| 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. | 
| 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. | 
| Verticle | A verticle is a piece of code that can be deployed by Vert.x. | 
| Vertx | The entry point into the Vert.x Core API. | 
| WorkerExecutor | An executor for executing blocking code in Vert.x . | 
| Class | Description | 
|---|---|
| AbstractVerticle | An abstract base class that you can extend to write your own Verticle classes. | 
| DeploymentOptions | Options for configuring a verticle deployment. | 
| DeploymentOptionsConverter | Converter and mapper for  DeploymentOptions. | 
| Launcher | A  main()class that can be used to create Vert.x instance and deploy a verticle, or run a bare Vert.x instance. | 
| ServiceHelper | A helper class for loading factories from the classpath. | 
| VertxOptions | Instances of this class are used to configure  Vertxinstances. | 
| VertxOptionsConverter | Converter and mapper for  VertxOptions. | 
| Exception | Description | 
|---|---|
| VertxException | 
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