| Class | Description | 
|---|---|
| AsyncMap<K,V> | 
 An asynchronous map. 
 | 
| Counter | 
 An asynchronous counter that can be used to across the cluster to maintain a consistent count. 
 | 
| LocalMap<K,V> | 
 Local maps can be used to share data safely in a single Vert.x instance. 
 | 
| Lock | 
 An asynchronous exclusive lock which can be obtained from any node in the cluster. 
 | 
| SharedData | 
 Shared data allows you to share data safely between different parts of your application in a safe way. 
 | 
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