Class VERIFY_SUSPECT2

java.lang.Object
org.jgroups.stack.Protocol
org.jgroups.protocols.VERIFY_SUSPECT2
All Implemented Interfaces:
Runnable, Lifecycle
public class VERIFY_SUSPECT2 extends Protocol implements 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 Details

    • timeout

      protected long timeout

    • num_msgs

      protected int num_msgs

    • use_mcast_rsps

      protected boolean use_mcast_rsps

    • suspects

      protected final Set<VERIFY_SUSPECT2.Entry> suspects

    • running

      protected boolean running

    • timer

      protected TimeScheduler timer

  • Constructor Details

    • VERIFY_SUSPECT2

      public VERIFY_SUSPECT2()

  • Method Details

    • getSuspects

      public String getSuspects()

    • setTimeout

      public VERIFY_SUSPECT2 setTimeout(long timeout)

    • getTimeout

      public long getTimeout()

    • down

      public 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 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 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 Runnable

    • handle

      protected Object handle(VERIFY_SUSPECT2.VerifyHeader hdr)

    • verifySuspect

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

    • addSuspects

      protected void addSuspects(Collection<Address> list)
      Adds suspected members to the suspect list.
      Parameters:
      list - The list of suspected members

    • removeSuspect

      protected boolean removeSuspect(Address suspect)

    • unsuspect

      public void unsuspect(Address mbr)

    • stopThreadPool

      protected void stopThreadPool()

    • init

      public void init() throws 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:
      Exception - Thrown if protocol cannot be initialized successfully. This will cause the ProtocolStack to fail, so the the channel constructor will throw an exception

    • start

      public void start() throws Exception
      Description copied from class: Protocol
      This method is called on a JChannel.connect(String); starts work. Protocols are connected ready to receive events. Will be called from bottom to top.
      Specified by:
      start in interface Lifecycle
      Overrides:
      start in class Protocol
      Throws:
      Exception - Thrown if protocol cannot be started successfully. This will cause the ProtocolStack to fail, so JChannel.connect(String) will throw an exception

    • stop

      public void stop()
      Description copied from class: Protocol
      Called on a JChannel.disconnect(); stops work (e.g. by closing multicast socket). Will be called from top to bottom.
      Specified by:
      stop in interface Lifecycle
      Overrides:
      stop in class Protocol