# Uses of Package
org.apache.mina.handler.chain

- Packages that use org.apache.mina.handler.chain
  Package | Description
  --- | ---
  org.apache.mina.handler.chain | A handler implementation that helps you implement sequentially layered protocols using Chains of Responsibility pattern.

- Classes in org.apache.mina.handler.chain used by org.apache.mina.handler.chain
  Class and Description
  IoHandlerChain A chain of `IoHandlerCommand`s.
  IoHandlerChain.Entry Represents a name-command pair that an `IoHandlerChain` contains.
  IoHandlerCommand A `IoHandlerCommand` encapsulates a unit of processing work to be performed, whose purpose is to examine and/or modify the state of a transaction that is represented by custom attributes provided by `IoSession`.
  IoHandlerCommand.NextCommand Represents an indirect reference to the next `IoHandlerCommand` of the `IoHandlerChain`.

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