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Closes #885 from yaooqinn/engineevent.

Closes #885

6a7ac341 [Kent Yao] refine
41baf0e7 [Kent Yao] refine
2c141a06 [Kent Yao] test history server
d1b0823a [Kent Yao] test history server
3aae8417 [Kent Yao] dump the final engine status
257e50f5 [Kent Yao] Add Event for Engine
f1f1f0e8 [Kent Yao] Add Event for Engine
85addc6e [Kent Yao] Add Event for Engine
cece5888 [Kent Yao] Add Event for Engine
Authored-by: Kent Yao <yao@apache.org>
Signed-off-by: Kent Yao <yao@apache.org>