package caqti-lwt

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caqti-lwt
- Caqti_lwt
  - CONNECTION
    
    Response
  - Pool
- Caqti_lwt_sql_io
caqti-lwt.v1
- Caqti1_lwt
  - CONNECTION
    
    Param
    
    Tuple
  - Pool

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A pool implementation for the current concurrency library.

type ('a, +'e) t

val create : 
  ?max_size:int ->
  ?check:('a -> (bool -> unit) -> unit) ->
  ?validate:('a -> bool Lwt.t) ->
  (unit -> ('a, 'e) Stdlib.result Lwt.t) ->
  ('a -> unit Lwt.t) ->
  ('a, 'e) t

(internal) create alloc free is a pool of resources allocated by alloc and freed by free. This is primarily indented for implementing the connect_pool functions.

parameter max_size
Maximum number of resources to allocate at any given time.

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.

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

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

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

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