ChannelListener (Apache Tomcat 8.5.57 API Documentation)

org.apache.catalina.tribes

## Interface ChannelListener

- All Known Subinterfaces:
    ClusterDeployer
  All Known Implementing Classes:
    AbstractReplicatedMap, ClusterListener, ClusterSessionListener, FarmWarDeployer, LazyReplicatedMap, ReplicatedMap, RpcChannel, SimpleTcpCluster

      public interface ChannelListener

  Title: ChannelListener

  Description: An interface to listens to incoming messages from a channel

  When a message is received, the Channel will invoke the channel listener in a conditional sequence. `if ( listener.accept(msg,sender) ) listener.messageReceived(msg,sender);`
  A ChannelListener implementation MUST NOT return true on `accept(Serializable, Member)` if it doesn't intend to process the message. The channel can this way track whether a message was processed by an above application or if it was just received and forgot about, a feature required to support message-response(RPC) calls
  Version:
    1.0

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `accept(Serializable msg, Member sender)` Invoked by the channel to determine if the listener will process this message or not.
    `boolean` | `equals(Object listener)`
    `int` | `hashCode()`
    `void` | `messageReceived(Serializable msg, Member sender)` Receive a message from the channel

- - ### Method Detail

    - #### messageReceived

          void messageReceived(Serializable msg,
                             Member sender)

      Receive a message from the channel
      Parameters:
        `msg` - Serializable
        `sender` - - the source of the message

    - #### accept

          boolean accept(Serializable msg,
                       Member sender)

      Invoked by the channel to determine if the listener will process this message or not.
      Parameters:
        `msg` - Serializable
        `sender` - Member
      Returns:
        boolean

    - #### equals

          boolean equals(Object listener)

      Overrides:
        `equals` in class `Object`
      Parameters:
        `listener` - Object
      Returns:
        boolean
      See Also:
        `Object.equals(Object)`

    - #### hashCode

          int hashCode()

      Overrides:
        `hashCode` in class `Object`
      Returns:
        int
      See Also:
        `Object.hashCode()`

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