Introduce GateKeeper that manages the front gate of the server that processes requests #291
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This PR introduces the
GateKeeper
interface that manages the front gate of the Scalar DB server that processes requests. And I added the following two implementations:Scalar DB server uses the
GateKeeper
interface to pause/unpause requests for implementing the Scalar Admin interface.For now, the default is
LockFreeGateKeeper
, but I will conduct a performance test to compare the two implementations and determine which one we should make the default.Please take a look!