extended by org.jgroups.stack.Protocol
      extended by org.jgroups.protocols.FD
          extended by org.jgroups.protocols.FD_ICMP

public class FD_ICMP
extends FD

Protocol which uses InetAddress.isReachable() to check whether a given host is up or not, taking 1 argument; the host name of the host to be pinged. Note that this protocol only works with JDK 5 ! The implementation of this may or may not use ICMP ! An alternative is to create a TCP connection to port 7 (echo service) and see whether it works ! This is obviously done in JDK 5, so unless an echo service is configured to run, this won't work...

Bela Ban

Nested Class Summary
protected  class FD_ICMP.PingMonitor
          Runs InetAddress.isReachable().
Nested classes/interfaces inherited from class org.jgroups.protocols.FD
FD.Broadcaster, FD.BroadcastTask, FD.FdHeader, FD.Monitor
Field Summary
protected  java.lang.String bind_interface_str
Fields inherited from class org.jgroups.protocols.FD
bcast_task, local_addr, lock, members, num_heartbeats, num_suspect_events, num_tries, ping_dest, pingable_mbrs, suspect_history
Fields inherited from class org.jgroups.stack.Protocol
down_prot, ergonomics, id, log, name, stack, stats, up_prot
Constructor Summary
Method Summary
protected  FD.Monitor createMonitor()
 void init()
          Called after instance has been created (null constructor) and before protocol is started.
 java.lang.Object up(Event evt)
          An event was received from the layer below.
Methods inherited from class org.jgroups.protocols.FD
down, getCurrentNumTries, getLocalAddress, getMaxTries, getMembers, getNumberOfHeartbeatsSent, getNumSuspectEventsGenerated, getPingableMembers, getPingDest, getTimeout, isShun, printSuspectHistory, resetStats, setMaxTries, setShun, setTimeout, startFailureDetection, stop, stopFailureDetection
Methods inherited from class org.jgroups.stack.Protocol
destroy, downThreadEnabled, dumpStats, enableStats, getConfigurableObjects, getDownProtocol, getId, getLevel, getName, getProperties, getProtocolStack, getSocketFactory, getThreadFactory, getTransport, getUpProtocol, getValue, isErgonomics, printStats, providedDownServices, providedUpServices, requiredDownServices, requiredUpServices, setDownProtocol, setErgonomics, setId, setLevel, setProperties, setPropertiesInternal, setProperty, setProtocolStack, setSocketFactory, setUpProtocol, setValue, setValues, start, statsEnabled, upThreadEnabled
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail


protected java.lang.String bind_interface_str
Constructor Detail


public FD_ICMP()
Method Detail


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.

init in class FD
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


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().

up in class FD


protected FD.Monitor createMonitor()
createMonitor in class FD

Copyright © 1998-2009 Bela Ban / Red Hat. All Rights Reserved.