# Package io.vertx.groovy.core

- Class Summary
  Class | Description
  --- | ---
  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 io.vertx.groovy.core.Handler execution.
  Future | Represents the result of an action that may, or may not, have occurred yet.
  MultiMap | This class represents a MultiMap of String keys to a List of String values.
  TimeoutStream | A timeout stream is triggered by a timer, the io.vertx.groovy.core.Handler will 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 .