Class FD_ALL


  • public class FD_ALL
    extends Protocol
    Failure detection based on simple heartbeat protocol. Every member periodically multicasts a heartbeat. Every member also maintains a table of all members (minus itself). When data or a heartbeat from P are received, we reset the timestamp for P to the current time. Periodically, we check for expired members, and suspect those.
    Version:
    $Id: FD_ALL.java,v 1.12.2.3 2008/06/18 17:34:57 vlada Exp $
    Author:
    Bela Ban
    • Field Detail

      • num_heartbeats_sent

        protected int num_heartbeats_sent
      • num_heartbeats_received

        protected int num_heartbeats_received
      • num_suspect_events

        protected int num_suspect_events
    • Constructor Detail

      • FD_ALL

        public FD_ALL()
    • Method Detail

      • getName

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

        public java.lang.String getLocalAddress()
      • getMembers

        public java.lang.String getMembers()
      • getHeartbeatsSent

        public int getHeartbeatsSent()
      • getHeartbeatsReceived

        public int getHeartbeatsReceived()
      • getSuspectEventsSent

        public int getSuspectEventsSent()
      • getTimeout

        public long getTimeout()
      • setTimeout

        public void setTimeout​(long timeout)
      • getInterval

        public long getInterval()
      • setInterval

        public void setInterval​(long interval)
      • isShun

        public boolean isShun()
      • setShun

        public void setShun​(boolean flag)
      • isRunning

        public boolean isRunning()
      • printSuspectHistory

        public java.lang.String printSuspectHistory()
      • printTimestamps

        public java.lang.String printTimestamps()
      • 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
      • init

        public void init()
                  throws java.lang.Exception
        Description copied from class: Protocol
        Called after instance has been created (null constructor) and before protocol is started. Properties are already set. Other protocols are not yet connected and events cannot yet be sent.
        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 channel constructor 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
      • 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