Package org.jgroups.protocols
Class FD_ALL
- java.lang.Object
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- org.jgroups.stack.Protocol
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- org.jgroups.protocols.FD_ALL
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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
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
FD_ALL.Header
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Field Summary
Fields Modifier and Type Field Description protected int
num_heartbeats_received
protected int
num_heartbeats_sent
protected int
num_suspect_events
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Constructor Summary
Constructors Constructor Description FD_ALL()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
down(Event evt)
An event is to be sent down the stack.int
getHeartbeatsReceived()
int
getHeartbeatsSent()
long
getInterval()
java.lang.String
getLocalAddress()
java.lang.String
getMembers()
java.lang.String
getName()
int
getSuspectEventsSent()
long
getTimeout()
void
init()
Called after instance has been created (null constructor) and before protocol is started.boolean
isRunning()
boolean
isShun()
java.lang.String
printSuspectHistory()
java.lang.String
printTimestamps()
void
resetStats()
void
setInterval(long interval)
boolean
setProperties(java.util.Properties props)
Configures the protocol initially.void
setShun(boolean flag)
void
setTimeout(long timeout)
void
stop()
This method is called on aChannel.disconnect()
.java.lang.Object
up(Event evt)
An event was received from the layer below.-
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
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Method Detail
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getLocalAddress
public java.lang.String getLocalAddress()
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getMembers
public java.lang.String getMembers()
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getHeartbeatsSent
public int getHeartbeatsSent()
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getHeartbeatsReceived
public int getHeartbeatsReceived()
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getSuspectEventsSent
public int getSuspectEventsSent()
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getTimeout
public long getTimeout()
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setTimeout
public void setTimeout(long timeout)
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getInterval
public long getInterval()
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setInterval
public void setInterval(long interval)
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isShun
public boolean isShun()
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setShun
public void setShun(boolean flag)
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isRunning
public boolean isRunning()
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printSuspectHistory
public java.lang.String printSuspectHistory()
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printTimestamps
public java.lang.String printTimestamps()
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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 classProtocol
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resetStats
public void resetStats()
- Overrides:
resetStats
in classProtocol
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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.
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stop
public void stop()
Description copied from class:Protocol
This method is called on aChannel.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
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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 usingdown_prot.down()
or c) the event (or another event) is sent up the stack usingup_prot.up()
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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 usingdown_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 usingup_prot.up()
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