Package org.jgroups.protocols
Class VERIFY_SUSPECT
java.lang.Object
org.jgroups.stack.Protocol
org.jgroups.protocols.VERIFY_SUSPECT
- All Implemented Interfaces:
Runnable
Catches SUSPECT events traveling up the stack. Verifies that the suspected member is really dead. If yes,
passes SUSPECT event up the stack, otherwise discards it. Has to be placed somewhere above the FD layer and
below the GMS layer (receiver of the SUSPECT event). Note that SUSPECT events may be reordered by this protocol.
- Version:
- $Id: VERIFY_SUSPECT.java,v 1.32.2.2 2008/09/03 15:13:37 vlada Exp $
- Author:
- Bela Ban
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Nested Class Summary
Nested Classes -
Field Summary
Fields -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionAn event is to be sent down the stack.getName()
void
init()
Called after instance has been created (null constructor) and before protocol is started.void
run()
Will be started when a suspect is added to the suspects hashtable.boolean
setProperties
(Properties props) Configures the protocol initially.void
start()
This method is called on aChannel.connect(String)
.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, resetStats, setDownProtocol, setPropertiesInternal, setProtocolStack, setUpProtocol, statsEnabled, upThreadEnabled
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Field Details
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shutting_down
protected boolean shutting_down
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Constructor Details
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VERIFY_SUSPECT
public VERIFY_SUSPECT()
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Method Details
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getName
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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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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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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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run
public void run()Will be started when a suspect is added to the suspects hashtable. Continually iterates over the entries and removes entries whose time have elapsed. For each removed entry, a SUSPECT event is passed up the stack (because elapsed time means verification of member's liveness failed). Computes the shortest time to wait (min of all timeouts) and waits(time) msecs. Will be woken up when entry is removed (in case of successful verification of that member's liveness). Terminates when no entry remains in the hashtable. -
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. -
start
Description copied from class:Protocol
This method is called on aChannel.connect(String)
. Starts work. Protocols are connected and queues are ready to receive events. Will be called from bottom to top. This call will replace the START and START_OK events.- Overrides:
start
in classProtocol
- Throws:
Exception
- Thrown if protocol cannot be started successfully. This will cause the ProtocolStack to fail, soChannel.connect(String)
will throw an exception
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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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