Class FD_ALL

java.lang.Object
org.jgroups.stack.Protocol
org.jgroups.protocols.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 Details

    • 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 Details

    • FD_ALL

      public FD_ALL()
  • Method Details

    • getName

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

      public String getLocalAddress()
    • getMembers

      public 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 String printSuspectHistory()
    • printTimestamps

      public String printTimestamps()
    • setProperties

      public boolean setProperties(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
    • resetStats

      public void resetStats()
      Overrides:
      resetStats in class Protocol
    • init

      public void init() throws 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:
      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 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 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