package shared-block-ring

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Parameters
Signature

shared-block-ring
- Shared_block
  - EraseBlock
    
    Make
    
    B
  - Journal
    
    Make
    
    Block
    
    Clock
    
    Log
    
    Operation
    
    Time
  - Ring
    
    Make
    
    B
    
    Consumer
    
    Item
    
    Log
    
    Producer
  - S
    
    CLOCK
    
    COMPARABLE
    
    CONSUMER
    
    CSTRUCTABLE
    
    JOURNAL
    
    LOG
    
    PRODUCER
    
    RING

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Create a journal from a block device. Descriptions of idempotent operations may be pushed to the journal, and we guarantee to perform them at-least-once in the order they were pushed provided the block device is available. If the program crashes, the journal replay will be started when the program restarts.

Parameters

module Log : S.LOG

module Block : S.BLOCK

module Time : S.TIME

module Clock : S.CLOCK

module Operation : S.CSTRUCTABLE

Signature

type t

A journal kept on disk of work we need to perform

type error = [

| `Msg of string

]

type 'a result = ('a, error) Result.result

val pp_error : Stdlib.Format.formatter -> error -> unit

val open_error : 'a result -> ('a, [> error ]) Result.result

val error_to_msg : 'a result -> ('a, S.msg) Result.result

val start : 
  ?name:string ->
  ?client:string ->
  ?flush_interval:int64 ->
  ?retry_interval:int64 ->
  Block.t ->
  (Operation.t list -> unit result Lwt.t) ->
  t result Lwt.t

Start a journal replay thread on a given disk, with the given processing function which will be applied at-least-once to every item in the journal. If a flush_interval is provided then every push will start a timer and the items will not be processed until the timer expires (or the journal becomes full) to encourage batching. The retry_interval gives the delay between re'perform'ing journalled items that fail. Default is 5 seconds.

val shutdown : t -> unit Lwt.t

Shut down a journal replay thread

type waiter = {

flush : unit -> unit;
sync : unit -> unit Lwt.t;

}

val push : t -> Operation.t -> waiter result Lwt.t

Append an operation to the journal. When this returns, the operation will be performed at-least-once before any later items are performed. If a client needs to wait for the operation to be completed then call the returned thunk and wait for the resulting thread.