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java.lang.Objectorg.jgroups.stack.Protocol
org.jgroups.protocols.FD_SIMPLE
public class FD_SIMPLE
Simple failure detection protocol. Periodically sends a are-you-alive message to a randomly chosen member (excluding itself) and waits for a response. If a response has not been received within timeout msecs, a counter associated with that member will be incremented. If the counter exceeds max_missed_hbs, that member will be suspected. When a message or a heartbeat are received, the counter is reset to 0.
Nested Class Summary | |
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static class |
FD_SIMPLE.FdHeader
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Field Summary |
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Fields inherited from class org.jgroups.stack.Protocol |
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down_handler, down_prot, down_queue, down_thread, down_thread_prio, log, observer, props, stack, stats, up_handler, up_prot, up_queue, up_thread, up_thread_prio |
Constructor Summary | |
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FD_SIMPLE()
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Method Summary | |
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void |
down(Event evt)
An event is to be sent down the stack. |
java.lang.String |
getName()
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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. |
void |
stop()
This method is called on a Channel.disconnect() . |
void |
up(Event evt)
An event was received from the layer below. |
Methods inherited from class org.jgroups.stack.Protocol |
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destroy, downThreadEnabled, dumpStats, enableStats, getDownProtocol, getDownQueue, getProperties, getUpProtocol, getUpQueue, handleSpecialDownEvent, passDown, passUp, printStats, providedDownServices, providedUpServices, receiveDownEvent, receiveUpEvent, requiredDownServices, requiredUpServices, resetStats, setDownProtocol, setObserver, setPropertiesInternal, setProtocolStack, setUpProtocol, start, startDownHandler, startUpHandler, statsEnabled, stopInternal, upThreadEnabled |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public FD_SIMPLE()
Method Detail |
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public java.lang.String getName()
getName
in class Protocol
public void init() throws java.lang.Exception
Protocol
init
in class Protocol
java.lang.Exception
- Thrown if protocol cannot be initialized successfully. This will cause the
ProtocolStack to fail, so the channel constructor will throw an exceptionpublic boolean setProperties(java.util.Properties props)
Protocol
"loopback=false;unicast_inport=4444"
setProperties
in class Protocol
public void stop()
Protocol
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
stop
in class Protocol
public void up(Event evt)
Protocol
passDown()
or c) the event (or another event) is sent up
the stack using passUp()
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up
in class Protocol
public void down(Event evt)
Protocol
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()
.
down
in class Protocol
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