NewExclusivePool initializes and returns a new ExclusivePool object.

NewStatusTable initializes and returns a new StatusTable object.

NewUniqueQueue initializes and returns a new UniqueQueue object.

ExclusivePool is a pool of non-identical instances that only one instance with same identity is in the pool at a time.

StatusTable is a table maintains true/false values.

UniqueQueue is a queue which guarantees only one instance of same identity is in the line.