org.javagroups.protocols
Class FD_RAND
org.javagroups.protocols.FD_RAND
- All Implemented Interfaces:
- java.lang.Runnable
- public class FD_RAND
- implements java.lang.Runnable
Failure detection based on simple heartbeat protocol. Regularly polls randomly
selected members for liveness. Passes SUSPECT message up the stack when a member is
not reachable. The simple algorithms works as follows: the membership is known. Each
HB protocol periodically sends a 'are-you-alive' message to a randomly selected
member, except itself. When a response hasn't been received for n milliseconds and m
tries, the corresponding member is suspected (and eventually excluded if faulty).
FD_RAND starts when it detects (in a view change notification) that there are at least
2 members in the group. It stops running when the membership drops below 2.
Method Summary |
void |
down(org.javagroups.protocols.Event evt)
|
java.lang.String |
getName()
|
void |
run()
Loop while more than 1 member available. |
boolean |
setProperties(java.util.Properties props)
|
void |
up(org.javagroups.protocols.Event evt)
|
FD_RAND
public FD_RAND()
getName
public java.lang.String getName()
setProperties
public boolean setProperties(java.util.Properties props)
up
public void up(org.javagroups.protocols.Event evt)
down
public void down(org.javagroups.protocols.Event evt)
run
public void run()
- Loop while more than 1 member available. Choose a member randomly (not myself !) and send a
heartbeat. Wait for ack. If ack not received withing timeout, mcast SUSPECT message.
- Specified by:
run
in interface java.lang.Runnable
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