Class FD_ICMP

java.lang.Object

org.jgroups.stack.Protocol

org.jgroups.protocols.FD

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...

Version:

$Id: FD_ICMP.java,v 1.9 2007/08/27 08:09:19 belaban Exp $

Author:

Bela Ban

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	FD_ICMP.PingMonitor	Runs InetAddress.isReachable().

Nested classes/interfaces inherited from class FD

FD.Broadcaster, FD.BroadcastTask, FD.FdHeader, FD.Monitor

Field Summary

Fields inherited from class FD

bcast_task, lock, num_heartbeats, num_suspect_events

Fields inherited from class Protocol

down_prot, log, props, stack, stats, up_prot

Constructor Summary

Constructors

Constructor	Description
FD_ICMP()

Method Summary

Modifier and Type	Method	Description
protected FD.Monitor	createMonitor()
String	getName()
void	init()	Called after instance has been created (null constructor) and before protocol is started.
boolean	setProperties(Properties props)	Configures the protocol initially.
Object	up(Event evt)	An event was received from the layer below.

Methods inherited from class FD

down, getCurrentNumTries, getLocalAddress, getMaxTries, getMembers, getNumberOfHeartbeatsSent, getNumSuspectEventsGenerated, getPingableMembers, getPingDest, getTimeout, isShun, printSuspectHistory, resetStats, setMaxTries, setShun, setTimeout, stop

Methods inherited from class Protocol

destroy, downThreadEnabled, dumpStats, enableStats, getDownProtocol, getProperties, getProtocolStack, getThreadFactory, getTransport, getUpProtocol, printStats, providedDownServices, providedUpServices, requiredDownServices, requiredUpServices, setDownProtocol, setPropertiesInternal, setProtocolStack, setUpProtocol, start, statsEnabled, upThreadEnabled

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

FD_ICMP

public FD_ICMP()

Method Details

getName

public String getName()

Overrides:

getName in class FD

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 FD

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 FD

Throws:

Exception - Thrown if protocol cannot be initialized successfully. This will cause the ProtocolStack to fail, so the channel constructor will throw an exception

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 FD

createMonitor

protected FD.Monitor createMonitor()