# Class AsyncChannelGroupUtil

java.lang.Object
org.apache.tomcat.websocket.AsyncChannelGroupUtil

public class AsyncChannelGroupUtil extends Object
This is a utility class that enables multiple `WsWebSocketContainer` instances to share a single `AsynchronousChannelGroup` while ensuring that the group is destroyed when no longer required.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `static AsynchronousChannelGroup`
  `register()`
  Registers a user of the shared `AsynchronousChannelGroup`, creating it if necessary.
  `static void`
  `unregister()`
  Unregisters a user of the shared `AsynchronousChannelGroup`, shutting it down if no users remain.

  ### Methods inherited from class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Method Details

  - ### register

    public static AsynchronousChannelGroup register()
    Registers a user of the shared `AsynchronousChannelGroup`, creating it if necessary.
    Returns:
      the shared `AsynchronousChannelGroup`

  - ### unregister

    public static void unregister()
    Unregisters a user of the shared `AsynchronousChannelGroup`, shutting it down if no users remain.