Update version #4.
https://sourceforge.net/u/winhvu/review/ci/ab6cf7db983cc97ad4e4b5e39327bd9c72004d11/
Major Changes:
1) Remove failed-recovery client is done in LOG application thread instead of
recovery thread
2) Do not lock application thread while recovery thread is on-going if it is
operating on successful recovery clients
3) Make `Search<xx>ByHandle()` to `FetchAndUpdateObjectState()` critical
section.
4) Introduce ScopeData class, which is internally to lga_agent.cc, to avoid
using `goto` - easy missing restore the data back if it runs out of scope (e.g:
unlock recovery mutex, or restore the object state back).
5) Enhance documentation.
/Vu
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** [tickets:#2412] log: refactor handling log client database in log agent**
**Status:** review
**Milestone:** 5.17.08
**Created:** Tue Apr 04, 2017 12:08 PM UTC by Canh Truong
**Last Updated:** Mon May 08, 2017 08:49 AM UTC
**Owner:** Vu Minh Nguyen
In log agent, there is a link list holding all log clients of an application
process. Also, in each log client, there is an additional link list holding all
log streams which belongs to each log client.
Adding, modifying or deleing the link lists' elements or on sub-items of the
client dabases are distrubuted in a lot of places, this could easily cause
troubles regarding race condition, deadlock, or risks when adding code that do
changes the databases.
So, this ticket intends to remove that concern by doing:
1) Centralizing read/write accesses to the database to one place with its
private mutex
2) Use C++ containters to contain and handle databases
And will push the ticket in 02 increments:
1) Convert agent code to C++ without touching any existing logic (looks like
what AMF has done it in [#1673])
2) Do #1 and #2 above
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