Package org.jgroups.protocols

Class REVERSE

  • public class REVERSE
extends Protocol
    Reverses the next N messages that are received. E.g. for N=4, {1,2,3,4,5} will be sent up as {4,3,2,1,5}. Blocks until N messages have been received. Used for testing
    Since:
    4.1.5
    Author:
    Bela Ban

    • Field Detail

      • num_msgs_to_reverse

        protected volatile int num_msgs_to_reverse

      • filter

        protected java.util.function.Predicate<Message> filter

      • queue

        protected final java.util.Deque<Message> queue

    • Constructor Detail

      • REVERSE

        public REVERSE()

    • Method Detail

      • numMessagesToReverse

        public int numMessagesToReverse()

      • numMessagesToReverse

        public REVERSE numMessagesToReverse​(int n)

      • filter

        public java.util.function.Predicate<Message> filter()

      • filter

        public REVERSE filter​(java.util.function.Predicate<Message> f)

      • queuedMessages

        public int queuedMessages()

      • stop

        public void stop()
        Description copied from class: Protocol
        This method is called on a JChannel.disconnect(). Stops work (e.g. by closing multicast socket). Will be called from top to bottom. This means that at the time of the method invocation the neighbor protocol below is still working. This method will replace the STOP, STOP_OK, CLEANUP and CLEANUP_OK events. The ProtocolStack guarantees that when this method is called all messages in the down queue will have been flushed
        Overrides:
        stop 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(org.jgroups.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.getMatchingMessages(short,boolean)), 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