An experimental Racket library providing an abstraction for values associated with external resources that allows automatic resource pooling, per-thread virtual construction, and monadic composition
Sometimes a pool should be "warmed up" by preallocating a bunch of idle resources. A #:soft-min-idle keyword arg to disposable-pool should do the trick. When the pool is first created, that many resources should be withdrawn and immediately returned asynchronously. Then whenever an idle value is reused for a future allocation, if not enough idle values are present to satisfy the minimum, a value should be created and added asynchronously. The minimum is only a "soft" minimum because in order to prevent blocking, threads should be able to request an idle value and immediately begin work without blocking on the creation of a replacement value. Additionally, if the pool is at capacity there might be enough consumers of values that the soft minimum of idle values can't be satisfied without going over capacity.
Sometimes a pool should be "warmed up" by preallocating a bunch of idle resources. A
#:soft-min-idlekeyword arg todisposable-poolshould do the trick. When the pool is first created, that many resources should be withdrawn and immediately returned asynchronously. Then whenever an idle value is reused for a future allocation, if not enough idle values are present to satisfy the minimum, a value should be created and added asynchronously. The minimum is only a "soft" minimum because in order to prevent blocking, threads should be able to request an idle value and immediately begin work without blocking on the creation of a replacement value. Additionally, if the pool is at capacity there might be enough consumers of values that the soft minimum of idle values can't be satisfied without going over capacity.