Package org.apache.lens.server.query.collect

Interface Summary

Interface	Description
EstimatedQueryCollection
MutableQueryCollection	MutableQueryCollection interface defines all mutable behaviours on queries existing in lens system.
QueryCollection	QueryCollection interface defines all (immutable + mutable) behaviours on queries existing in lens system.
WaitingQueriesSelector	Selects a subset of waiting queries eligible to move out of waiting state.

Class Summary

Class	Description
DefaultEstimatedQueryCollection	Implementation which creates multiple in memory views of queries existing in lens system and owns responsibility of keeping all the views consistent with each other.
DefaultQueryCollection	Implementation which creates multiple in memory views of queries existing in lens system and owns responsibility of keeping all the views consistent with each other.
ThreadSafeEstimatedQueryCollection	Makes an implementation of EstimatedQueryCollection interface thread safe by wrapping all behaviours in synchronized method.
ThreadSafeQueryCollection	Makes a QueryCollection implementation thread safe by synchronizing all behaviours.
UnioningWaitingQueriesSelector	Selects queries eligible by all WaitingQueriesSelectionPolicy to move them out of waiting state.
UserSpecificWaitingQueriesSelectionPolicy
UserSpecificWaitingQueriesSelectionPolicyFactory