Package org.jgroups.protocols

Class VERIFY_SUSPECT2

  • All Implemented Interfaces:
    java.lang.Runnable, Lifecycle
    public class VERIFY_SUSPECT2
extends Protocol
implements java.lang.Runnable
    Double-checks that a suspected member is really dead.
    Details: https://issues.redhat.com/browse/JGRP-2558
    Design: https://github.com/belaban/JGroups/blob/master/doc/design/VERIFY_SUSPECT2.txt
    Author:
    Bela Ban

    • Field Detail

      • timeout

        protected long timeout

      • num_msgs

        protected int num_msgs

      • use_mcast_rsps

        protected boolean use_mcast_rsps

      • running

        protected boolean running

      • thread_pool

        protected java.util.concurrent.ExecutorService thread_pool

    • Constructor Detail

      • VERIFY_SUSPECT2

        public VERIFY_SUSPECT2()

    • Method Detail

      • getSuspects

        public java.lang.String getSuspects()

      • getTimeout

        public long getTimeout()

      • down

        public java.lang.Object down​(Event evt)
        Description copied from class: Protocol
        An event is to be sent down the stack. A protocol may want to examine its type and perform some action on it, depending on the event's type. If the event is a message MSG, then the protocol may need to add a header to it (or do nothing at all) before sending it down the stack using down_prot.down().
        Overrides:
        down in class Protocol

      • up

        public java.lang.Object up​(Event evt)
        Description copied from class: Protocol
        An event was received from the protocol below. Usually the current protocol will want to examine the event type and - depending on its type - perform some computation (e.g. removing headers from a MSG event type, or updating the internal membership list when receiving a VIEW_CHANGE event). Finally, the event is either a) discarded, or b) an event is sent down the stack using down_prot.down() or c) the event (or another event) is sent up the stack using up_prot.up().
        Overrides:
        up in class Protocol

      • up

        public java.lang.Object up​(Message msg)
        Description copied from class: Protocol
        A single message was received. Protocols may examine the message and do something (e.g. add a header) with it before passing it up.
        Overrides:
        up in class Protocol

      • up

        public void up​(MessageBatch batch)
        Description copied from class: Protocol
        Sends up a multiple messages in a MessageBatch. The sender of the batch is always the same, and so is the destination (null == multicast messages). Messages in a batch can be OOB messages, regular messages, or mixed messages, although the transport itself will create initial MessageBatches that contain only either OOB or regular messages.

        The default processing below sends messages up the stack individually, based on a matching criteria (calling Protocol.accept(Message)), and - if true - calls Protocol.up(org.jgroups.Event) for that message and removes the message. If the batch is not empty, it is passed up, or else it is dropped.

        Subclasses should check if there are any messages destined for them (e.g. using MessageBatch.iterator(Predicate)), then possibly remove and process them and finally pass the batch up to the next protocol. Protocols can also modify messages in place, e.g. ENCRYPT could decrypt all encrypted messages in the batch, not remove them, and pass the batch up when done.

        Overrides:
        up in class Protocol
        Parameters:
        batch - The message batch

      • run

        public void run()
        Started when a suspected member is added to suspects. Clears the bucket and sends the contents up the stack as SUSPECT events, then moves suspects from the queue to the bucket. Runs until the queue and bucket are both empty.
        Specified by:
        run in interface java.lang.Runnable

      • verifySuspect

        protected void verifySuspect​(java.util.Collection<Address> mbrs)
        Sends ARE_YOU_DEAD message to suspected_mbr, wait for return or timeout

      • addSuspects

        protected boolean addSuspects​(java.util.Collection<Address> list)
        Adds suspected members to the suspect list. Returns true if a member is not present and the timer is not running.
        Parameters:
        list - The list of suspected members
        Returns:
        true if the timer needs to be started, or false otherwise

      • removeSuspect

        protected boolean removeSuspect​(Address suspect)

      • unsuspect

        public void unsuspect​(Address mbr)

      • startTask

        protected void startTask()

      • stopThreadPool

        protected void stopThreadPool()

      • init

        public void init()
          throws java.lang.Exception
        Description copied from class: Protocol
        Called after a protocol has been created and before the protocol is started. Attributes are already set. Other protocols are not yet connected and events cannot yet be sent.
        Specified by:
        init in interface Lifecycle
        Overrides:
        init in class Protocol
        Throws:
        java.lang.Exception - Thrown if protocol cannot be initialized successfully. This will cause the ProtocolStack to fail, so the the channel constructor will throw an exception