package caqti

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Unified interface to relational database libraries

Install

Dune Dependency

github.com Readme Changelog Edit opam file Versions (21)

Authors

Maintainers

P

Petter A. Urkedal <paurkedal@gmail.com>

Sources

caqti-v2.2.4.tbz

sha256=b8ea432820154ec095132c4f7b244b06cd8553e0b2035185b844d9c4f30af8bb

sha512=b7e3ad8e6a9b587db2d517e15cd42df2945148f9223b2fa6f4bc2bcdd2709d53549cca4b65e54511d22466e4c9aa7f0b9c17305a07505519d8bf81d95de629b8

doc/caqti.platform/Caqti_platform/Connector/Make/argument-2-Pool/index.html

Parameter `Make.Pool`

include Caqti_pool_sig.S with type 'a fiber := 'a System.Fiber.t

type ('a, +'e) t

val size : ('a, 'e) t -> int

size pool is the current number of open resources in pool.

val use : 
  ?priority:float ->
  ('a -> ('b, 'e) result System.Fiber.t) ->
  ('a, 'e) t ->
  ('b, 'e) result System.Fiber.t

use f pool calls f on a resource drawn from pool, handing back the resource to the pool when f exits.

parameter priority
Requests for the resource are handled in decreasing order of priority. The default priority is 0.0.

val drain : ('a, 'e) t -> unit System.Fiber.t

drain pool closes all resources in pool. The pool is still usable, as new resources will be created on demand.

val create : 
  ?config:Caqti_pool_config.t ->
  ?check:('a -> (bool -> unit) -> unit) ->
  ?validate:('a -> bool System.Fiber.t) ->
  ?log_src:Logs.Src.t ->
  sw:System.Switch.t ->
  stdenv:System.stdenv ->
  (unit -> ('a, 'e) result System.Fiber.t) ->
  ('a -> unit System.Fiber.t) ->
  ('a, 'e) t

Internal: create alloc free is a pool of resources allocated by alloc and freed by free. This is primarily intended for implementing the connect_pool functions.

parameter max_size
The maximum number of allocated resources.

parameter max_idle_size
The maximum number of resources to pool for later use. Defaults to max_size.

parameter max_use_count
The maximum number of times to use a connection, or None for no limit.

parameter check
A function used to check a resource after use.

parameter validate
A function to check before use that a resource is still valid.