java.lang.Object
org.jgroups.stack.Protocol
org.jgroups.protocols.pbcast.FD
- All Implemented Interfaces:
- java.lang.Runnable
- public class FD
- extends org.jgroups.stack.Protocol
- implements java.lang.Runnable
Passive failure detection protocol. It assumes a pbcast protocol, which uses rounds of gossiping for
reliable message delivery. Gossip protocols typically involve all the members sending gossips in regular
intervals. This protocol therefore works as follows: it allocates a timestamp for each member and updates
the timestamp whenever it receives a message from a sender P. Any type of message is accepted from P. For
example, PBCAST regularly sends the following messages:
- regular mcast message from P
- regular ucast message from P
- gossip from P
- retransmit request from P
- retransmit response from P
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Nested Class Summary |
(package private) static class |
FD.Entry
|
| Fields inherited from class org.jgroups.stack.Protocol |
down_handler, down_prot, down_queue, down_thread, down_thread_prio, log, observer, props, stack, stats, trace, up_handler, up_prot, up_queue, up_thread, up_thread_prio, warn |
| Methods inherited from class org.jgroups.stack.Protocol |
destroy, downThreadEnabled, dumpStats, enableStats, getDownProtocol, getDownQueue, getProperties, getUpProtocol, getUpQueue, handleSpecialDownEvent, init, isTrace, isWarn, passDown, passUp, printStats, providedDownServices, providedUpServices, receiveDownEvent, receiveUpEvent, requiredDownServices, requiredUpServices, resetStats, setDownProtocol, setObserver, setPropertiesInternal, setProtocolStack, setTrace, setUpProtocol, setWarn, start, startDownHandler, startUpHandler, statsEnabled, stopInternal, upThreadEnabled |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
local_addr
org.jgroups.Address local_addr
checker
java.lang.Thread checker
checker_lock
final java.lang.Object checker_lock
timeout
long timeout
members
final java.util.Hashtable members
suspected_mbrs
final java.util.Vector suspected_mbrs
FD
public FD()
getName
public java.lang.String getName()
setProperties
public boolean setProperties(java.util.Properties props)
- Description copied from class:
org.jgroups.stack.Protocol
- Configures the protocol initially. A configuration string consists of name=value
items, separated by a ';' (semicolon), e.g.:
"loopback=false;unicast_inport=4444"
stop
public void stop()
- Description copied from class:
org.jgroups.stack.Protocol
- This method is called on a Channel.disconnect()>
Channel.disconnect() 55 . 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
up
public void up(org.jgroups.Event evt)
- Description copied from class:
org.jgroups.stack.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
passDown() or c) the event (or another event) is sent up
the stack using passUp().
down
public void down(org.jgroups.Event evt)
- Description copied from class:
org.jgroups.stack.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
passDown(). 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 passUp().
run
public void run()
- Description copied from interface:
java.lang.Runnable
- This method will be called by whoever wishes to run your class
implementing Runnable. Note that there are no restrictions on what
you are allowed to do in the run method, except that you cannot
throw a checked exception.
- Specified by:
run in interface java.lang.Runnable
startChecker
void startChecker()
stopChecker
void stopChecker()
updateSender
void updateSender(org.jgroups.Address mbr)
updateSenders
void updateSenders(java.util.Vector v)
printTimestamps
java.lang.String printTimestamps()
JAVADOC | 
SOURCE | 
DOWNLOAD | NESTED | FIELD | CONSTR | METHOD