Package org.jgroups.protocols
Class FD_ALL
java.lang.Object
org.jgroups.stack.Protocol
org.jgroups.protocols.FD_ALL
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 -
Field Summary
FieldsModifier and TypeFieldDescriptionprotected int
protected int
protected int
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionAn event is to be sent down the stack.int
int
long
getName()
int
long
void
init()
Called after instance has been created (null constructor) and before protocol is started.boolean
boolean
isShun()
void
void
setInterval
(long interval) boolean
setProperties
(Properties props) Configures the protocol initially.void
setShun
(boolean flag) void
setTimeout
(long timeout) void
stop()
This method is called on aChannel.disconnect()
.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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Field Details
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num_heartbeats_sent
protected int num_heartbeats_sent -
num_heartbeats_received
protected int num_heartbeats_received -
num_suspect_events
protected int num_suspect_events
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Constructor Details
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FD_ALL
public FD_ALL()
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Method Details
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getName
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getLocalAddress
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getMembers
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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
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printTimestamps
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setProperties
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
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. -
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 -
up
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
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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