ClearChannel clear all content in channel.

NewAutoscaler return new Autoscaler object.

ReadChanWithTimeout read something from channel with timeout.

WriteChanWithTimeout write something to channel with timeout.

DefaultMaxWorkerQuantity is the default maxWorkerQuantity.

DefaultMinWorkerQuantity is the default minWorkerQuantity.

DefaultScaleDownThreshold is the default scaleDownThreshold.

DefaultScaleUpThreshold is the default scaleUpThreshold.

ErrChanClosed means the channel waited from is closed.

ErrNotChanType means object is not channel, but used as channel.

should never happen.

ErrTimeout means waiting is timeout.

Autoscaler struct.

Executor backend interface.

Job is the interface of the REAL JOB need to impl.