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important ：Draw on the experience of Muduo in Network programming.

UML:

basic function：

 build dictionary and index from corpus you provide，and though network，client send a query to server，server will search it in cache（if cached），else will search in index，and send back the query-result.

network

 socket + tcp + epoll(LT in 1st ed.)

index

reverse index and build from two english file(will support Chinese later)

cache

timer-thread

 

spellcorrect