use Guava cache to return ListenableFuture #7
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@Tam @viettienn
Please review.
Issue: https://github.com/wego/akasha/issues/274
Solution:
Used Guava Cache which ll keep ListenableFuture object based on responseId.
Idea here is if same search happened at the same time, we can use provider requests from both the searches and because we have a guava caching which keeps ListenableFurture object, it ll be non blocking and whenever response is ready for any request it ll be returned to all the requests.
Guava cache suits best here because it handles the concurrency situation properly.