1. First commit
1. adding code for update user's interest
Merge remote-tracking branch 'upstream/master'
interest update finished
1. added logging code for performance tracking
add code todo performance logging
added log4j2 config file
Merge remote-tracking branch 'upstream/master'
fix log4j config issue
fix log4j config issue
add code to analyze timespend on serve events when update user interests
Merge remote-tracking branch 'upstream/master'
add more performance logging
add DBbase.java
Merge pull request #1 from xiatao123/master

please pull tao's code