Merge pull request #205 from ainilife/biz

more unit tests
remove unnecessary null check
Merge pull request #206 from ainilife/biz

refactor the code
Merge pull request #207 from youyong205/biz

Biz
small refine
Merge branch 'biz' of ssh://code.dianpingoa.com/arch/cat into biz
Merge branch 'biz' of ssh://code.dianpingoa.com/arch/cat into biz
refine the code
Merge branch 'biz' of ssh://code.dianpingoa.com/arch/cat into biz
modify the metric analyzer id
Merge branch 'biz' of code.dianpingoa.com:arch/cat into biz
fix error code