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Object pools employ one of three strategies to handle a request when there are no spare objects in the pool.
# Fail to provide an object (and return an error to the client).
# Allocate a new object, thus increasing the size of the pool. Pools that do this usually allow you to set the [[high water mark]] (the maximum number of objects ever used).
# In a [[Thread (computer science)|multithreaded]] environment, a pool may block the client until another thread returns an object to the pool.
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