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This article introduces the relevant knowledge of "what are the characteristics of Agenda". In the operation of actual cases, many people will encounter such a dilemma. Then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Agenda is a lightweight task scheduling class library based on node, which has the advantages of lightweight, persistence and easy to use.

Characteristics of Agenda

1) persistence

Agenda introduces mongodb to achieve persistence. Agenda stores all tasks (job) in mongodb, which has a natural advantage for projects that use mongodb as a database.

2) structure

When the Agenda starts, it traverses the predefined processors to query the qualified job from the mongodb (there may be more than one job here). For the job that traverses the query: if the time is up or has passed, it is executed immediately; if the time is not yet up, then execution is delayed.

3) API

The popularity of Agenda is inseparable from its simple and flexible API.

Installation of Agenda

Npminstallagenda

Use

ConstmongoConnectionString='mongodb://127.0.0.1/agenda'

Constagenda=newAgenda ({db: {address:mongoConnectionString}})

/ / Oroverridethedefaultcollectionname:

/ / constagenda=newAgenda ({db: {address:mongoConnectionString,collection:'jobCollectionName'}})

/ / orpassadditionalconnectionoptions:

/ / constagenda=newAgenda ({db: {address:mongoConnectionString,collection:'jobCollectionName',options: {ssl:true})

/ / orpassinanexistingmongodb-nativeMongoClientinstance

/ / constagenda=newAgenda ({mongo:myMongoClient})

Agenda.define ('deleteoldusers', (job,done) = > {

User.remove ({lastLogIn: {$lt:twoDaysAgo}}, done)

})

(asyncfunction () {/ / IIFEtogiveaccesstoasync/await

Awaitagenda.start ()

Awaitagenda.every ('3minutesusers')

/ / Alternatively,youcouldalsodo:

Awaitagenda.every ('* / 3 million users')

) ()

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