Package org.jgroups.protocols

Class VIEW_SYNC

  • public class VIEW_SYNC
extends Protocol
    Periodically sends the view to the group. When a view is received which is greater than the current view, we install it. Otherwise we simply discard it. This is used to solve the problem for unreliable view dissemination outlined in JGroups/doc/ReliableViewInstallation.txt. This protocol is supposed to be just below GMS.
    Version:
    $Id: VIEW_SYNC.java,v 1.24.2.2 2008/05/22 13:23:06 belaban Exp $
    Author:
    Bela Ban

    • Constructor Detail

      • VIEW_SYNC

        public VIEW_SYNC()

    • Method Detail

      • getName

        public java.lang.String getName()
        Specified by:
        getName in class Protocol

      • getAverageSendInterval

        public long getAverageSendInterval()

      • setAverageSendInterval

        public void setAverageSendInterval​(long gossip_interval)

      • getNumViewsSent

        public int getNumViewsSent()

      • getNumViewRequestsSent

        public int getNumViewRequestsSent()

      • getNumViewResponsesSeen

        public int getNumViewResponsesSeen()

      • getNumViewsNonLocal

        public int getNumViewsNonLocal()

      • getNumViewsLess

        public int getNumViewsLess()

      • getNumViewsEqual

        public int getNumViewsEqual()

      • getLastViewRequestSent

        public long getLastViewRequestSent()

      • getNumViewsAdjusted

        public int getNumViewsAdjusted()

      • setProperties

        public boolean setProperties​(java.util.Properties props)
        Description copied from class: Protocol
        Configures the protocol initially. A configuration string consists of name=value items, separated by a ';' (semicolon), e.g.:
         "loopback=false;unicast_inport=4444"
        Overrides:
        setProperties in class Protocol

      • start

        public void start()
           throws java.lang.Exception
        Description copied from class: Protocol
        This method is called on a Channel.connect(String). Starts work. Protocols are connected and queues are ready to receive events. Will be called from bottom to top. This call will replace the START and START_OK events.
        Overrides:
        start in class Protocol
        Throws:
        java.lang.Exception - Thrown if protocol cannot be started successfully. This will cause the ProtocolStack to fail, so Channel.connect(String) will throw an exception

      • stop

        public void stop()
        Description copied from class: Protocol
        This method is called on a Channel.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

      • sendViewRequest

        public void sendViewRequest()
        Sends a VIEW_SYNC_REQ to all members, every member replies with a VIEW multicast

      • up

        public java.lang.Object up​(Event evt)
        Description copied from class: Protocol
        An event was received from the layer below. Usually the current layer 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

      • down

        public java.lang.Object down​(Event evt)
        Description copied from class: Protocol
        An event is to be sent down the stack. The layer 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 layer may need to add a header to it (or do nothing at all) before sending it down the stack using down_prot.down(). In case of a GET_ADDRESS event (which tries to retrieve the stack's address from one of the bottom layers), the layer may need to send a new response event back up the stack using up_prot.up().
        Overrides:
        down in class Protocol