org.javagroups.protocols
Class VERIFY_SUSPECT
java.lang.Object
|
+--org.javagroups.stack.Protocol
|
+--org.javagroups.protocols.VERIFY_SUSPECT
- All Implemented Interfaces:
- java.lang.Runnable
- public class VERIFY_SUSPECT
- extends Protocol
- implements java.lang.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.
Fields inherited from class org.javagroups.stack.Protocol |
down_handler, down_prot, down_queue, down_thread, observer, props, stack, up_handler, up_prot, up_queue, up_thread |
Method Summary |
void |
down(Event evt)
An event is to be sent down the stack. |
java.lang.String |
getName()
|
void |
run()
Will be started when a suspect is added to the suspects hashtable. |
boolean |
setProperties(java.util.Properties props)
Configures the protocol initially. |
void |
up(Event evt)
An event was received from the layer below. |
Methods inherited from class org.javagroups.stack.Protocol |
getDownProtocol, getDownQueue, getProperties, getUpProtocol, getUpQueue, init, passDown, passUp, providedDownServices, providedUpServices, receiveDownEvent, receiveUpEvent, requiredDownServices, requiredUpServices, setDownProtocol, setObserver, setPropertiesInternal, setProtocolStack, setUpProtocol, startDownHandler, startUpHandler, stopInternal |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
VERIFY_SUSPECT
public VERIFY_SUSPECT()
getName
public java.lang.String getName()
- Overrides:
getName
in class Protocol
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
down
public void 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
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()
.
- Overrides:
down
in class Protocol
up
public void 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
passDown()
or c) the event (or another event) is sent up
the stack using passUp()
.
- Overrides:
up
in class Protocol
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.
- Specified by:
run
in interface java.lang.Runnable
Copyright © 2001,2002 www.javagroups.com . All Rights Reserved.