org.jgroups.protocols
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
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 |
num_heartbeats_sent
protected int num_heartbeats_sent
num_heartbeats_received
protected int num_heartbeats_received
num_suspect_events
protected int num_suspect_events
FD_ALL
public FD_ALL()
getName
public java.lang.String getName()
- Specified by:
getName
in class Protocol
getLocalAddress
public java.lang.String getLocalAddress()
getMembers
public java.lang.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 java.lang.String printSuspectHistory()
printTimestamps
public java.lang.String printTimestamps()
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 Protocol
resetStats
public void resetStats()
- Overrides:
resetStats
in class Protocol
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 Protocol
- 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
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 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 Protocol
down
public java.lang.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
Copyright ? 1998-2008 Bela Ban. All Rights Reserved.