a fix for local store
add diry message number flush mechanism
Minor change.
Minor improvement.
Update shutdown logic.
Update test case.
Update test case.
Add more log.
Debug
Add more log.
Add more log.
Update example to send small number of messages but more frequently.
Change System.out.println to Logger.
Reduce logging frequency.
Stress more.
Update close method of DefaultLocalMessageStore
Remove shutdownhook from default local message store.
Update .cofig more frequently.
Update example.
Update example.