Package org.jgroups

Interface MembershipListener

    • Method Summary

      All Methods Instance Methods Default Methods 
      Modifier and Type Method Description
      default void block()
      Called (usually by the FLUSH protocol), as an indication that the member should stop sending messages.
      default void suspect​(Address suspected_mbr)
      Called whenever a member is suspected of having crashed, but has not yet been excluded.
      default void unblock()
      Called after the FLUSH protocol has unblocked previously blocked senders, and messages can be sent again.
      default void viewAccepted​(View new_view)
      Called when a change in membership has occurred.
    • Method Detail

      • viewAccepted

        default void viewAccepted​(View new_view)
        Called when a change in membership has occurred. No long running actions, sending of messages or anything that could block should be done in this callback. If some long running action needs to be performed, it should be done in a separate thread.

        Note that on reception of the first view (a new member just joined), the channel will not yet be in the connected state. This only happens when JChannel.connect(String) returns.

      • suspect

        default void suspect​(Address suspected_mbr)
        Called whenever a member is suspected of having crashed, but has not yet been excluded.
      • block

        default void block()
        Called (usually by the FLUSH protocol), as an indication that the member should stop sending messages. Any messages sent after returning from this callback might get blocked by the FLUSH protocol. When the FLUSH protocol is done, and messages can be sent again, the FLUSH protocol will simply unblock all pending messages. If a callback for unblocking is desired, implement unblock(). Note that block() is the equivalent of reception of a BlockEvent in the pull mode.
      • unblock

        default void unblock()
        Called after the FLUSH protocol has unblocked previously blocked senders, and messages can be sent again. This callback only needs to be implemented if we require a notification of that.

        Note that during new view installation we provide guarantee that unblock invocation strictly follows view installation at some node A belonging to that view . However, some other message M may squeeze in between view and unblock callbacks. For more details see https://jira.jboss.org/jira/browse/JGRP-986