postgresql-simple-queue: A PostgreSQL backed queue
This module utilize PostgreSQL to implement a durable queue for efficently processing arbitrary payloads which can be represented as JSON.
Typically a producer would enqueue a new payload as part of larger database transaction
createAccount userRecord = do 'runDBTSerializable' $ do createUserDB userRecord 'enqueueDB' "queue_schema" $ makeVerificationEmail userRecord
In another thread or process, the consumer would drain the queue.
forever $ do -- Attempt get a payload or block until one is available payload <- lock "queue" conn -- Perform application specifc parsing of the payload value case fromJSON $ pValue payload of Success x -> sendEmail x -- Perform application specific processing Error err -> logErr err -- Remove the payload from future processing dequeue "queue" conn $ pId payload To support multiple queues in the same database, the API expects a table name string to determine which queue tables to use.
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Versions [RSS] | 0.1.0.0, 0.1.0.1, 0.2.0.0, 0.2.1.0, 0.3.0.0, 0.4.0.0, 0.5.0.0, 0.5.0.1, 0.5.1.0, 0.5.1.1, 1.0.0, 1.0.1 |
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Dependencies | aeson, base (>=4.7 && <5), bytestring, exceptions, monad-control, pg-transact, postgresql-simple, random, stm, text, time, transformers [details] |
License | BSD-3-Clause |
Copyright | 2017 Jonathan Fischoff |
Author | Jonathan Fischoff |
Maintainer | jonathangfischoff@gmail.com |
Category | Web |
Home page | https://github.com/jfischoff/postgresql-queue#readme |
Bug tracker | https://github.com/jfischoff/postgresql-queue/issues |
Source repo | head: git clone https://github.com/jfischoff/postgresql-queue |
Uploaded | by JonathanFischoff at 2017-12-21T03:26:39Z |
Distributions | |
Reverse Dependencies | 1 direct, 0 indirect [details] |
Downloads | 7379 total (38 in the last 30 days) |
Rating | (no votes yet) [estimated by Bayesian average] |
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Status | Docs available [build log] Last success reported on 2017-12-21 [all 1 reports] |