# Hierarchy For All Packages

Package Hierarchies:

- org.apache.ignite.lang,
- org.apache.ignite.plugin.extensions.communication

## Class Hierarchy

- java.lang.Object
  - org.apache.ignite.lang.CancelHandleHelper

## Enum Class Hierarchy

- java.lang.Object
  - java.lang.Enum<E> (implements java.lang.Comparable<T>, java.lang.constant.Constable, java.io.Serializable)
    - org.apache.ignite.plugin.extensions.communication.MessageCollectionItemType