Package org.jgroups.protocols

Class SEQUENCER2

java.lang.Object
org.jgroups.stack.Protocol
org.jgroups.protocols.SEQUENCER2
All Implemented Interfaces:
Lifecycle
public class SEQUENCER2 extends Protocol
Implementation of total order protocol using a sequencer_uum.

  • Field Details

    • coord

      protected volatile Address coord

    • view

      protected volatile View view

    • is_coord

      protected volatile boolean is_coord

    • seqno

      protected final AtomicLong seqno

    • fwd_queue

      protected final BlockingQueue<Message> fwd_queue

    • seqno_reqs

      protected final AtomicInteger seqno_reqs

    • running

      protected volatile boolean running

    • BATCH_ACCUMULATOR

      protected static final BiConsumer<MessageBatch,Message> BATCH_ACCUMULATOR

    • request_msgs

      protected long request_msgs

    • response_msgs

      protected long response_msgs

    • bcasts_sent

      protected long bcasts_sent

    • bcasts_received

      protected long bcasts_received

    • bcasts_delivered

      protected long bcasts_delivered

    • sent_requests

      protected long sent_requests

    • received_requests

      protected long received_requests

    • sent_responses

      protected long sent_responses

    • received_responses

      protected long received_responses

    • received_msgs

      protected Table<Message> received_msgs

  • Constructor Details

    • SEQUENCER2

      public SEQUENCER2()

  • Method Details

    • isCoordinator

      public boolean isCoordinator()

    • getCoordinator

      public Address getCoordinator()

    • getFwdQueueSize

      public int getFwdQueueSize()

    • resetStats

      public void resetStats()
      Overrides:
      resetStats in class Protocol

    • 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

    • 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

    • down

      public Object down(Message msg)
      Description copied from class: Protocol
      A message is sent down the stack. Protocols may examine the message and do something (e.g. add a header) with it, before passing it 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

    • handleViewChange

      protected void handleViewChange(View v)

    • handleTmpView

      private void handleTmpView(View v)

    • sendSeqnoRequest

      protected void sendSeqnoRequest(int num_seqnos)

    • sendSeqnoResponse

      protected void sendSeqnoResponse(Address original_sender, long seqno, int num_seqnos)

    • broadcast

      protected void broadcast(Message msg, long seqno)

    • deliver

      protected void deliver(Message msg, SEQUENCER2.SequencerHeader hdr)

    • removeAndDeliver

      protected void removeAndDeliver(Table<Message> win, Address sender)

    • deliverBatch

      protected void deliverBatch(MessageBatch batch)