org.jgroups.protocols
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
Method Summary |
protected FD.Monitor |
createMonitor()
|
java.lang.String |
getName()
|
void |
init()
Called after instance has been created (null constructor) and before protocol is started. |
boolean |
setProperties(java.util.Properties props)
Configures the protocol initially. |
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, stop |
Methods inherited from class org.jgroups.stack.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 java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
FD_ICMP
public FD_ICMP()
getName
public java.lang.String getName()
- Overrides:
getName
in class FD
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 FD
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 FD
- 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
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 FD
createMonitor
protected FD.Monitor createMonitor()
Copyright ? 1998-2008 Bela Ban. All Rights Reserved.