fashion-model-action

A fashion-model wrapper for oja allowing data that is being defined and consumed to be a fashion-model.

Installation

npm install fashion-model-action --save

Usage

const Model = require('fashion-model/Model')
const FashionModelAction = require('fashion-model-action')

const Person = Model.extend({
  // The oja "topic" to defines
  typeName: 'person',
  properties: {
    name: String,
    height: Number,
    weight: Number
  }
})

class PersonSearchAction extends FashionModelAction {
  execute() {
    this.define(Person, {
      name: 'John',
      height: 100,
      weight: 100
    })
  }
}

;(async function () {
  // { name: 'John', height: 100, weight: 100 }
  const person = await new PersonSearchAction()
    .activate()
    .consume(Person)
})()

How it works

A fashion-model's typeName property is used to define the producing oja topic.

const Person = require('fashion-model/Model').extend({
  // The oja "topic" to defines
  typeName: 'person',
  properties: {
    ...
  }
})

Consuming also uses the same fashion-model typeName property:

const Person = require('./models/Person')

const person = await new PersonSearchAction()
  .activate()
  .consume(Person)

API

• FashionModelAction() is a oja Action constructor

• consume(topics | Model [, callback]) adds a consumer to the flow for the given fashion-model typeName topic or standard oja topic(s).

  • topics is one or more topics to capture by the handler

  • Model is a fashion-model whose typeName property is used to determine the topic to capture by the handler

  • callback((data|map), flow) is a handler, if provided, it will be called once all topics are resolved

    • data resolved for the single topic
    • map of resolved data mapped to corresponding topics
    • flow is an instance of the flow for convenience

  • returns promise or a list of promises if callback is not provided;

    • promise for single topic
    • promises mapped to the provided topics

• consumeStream(topic | Model [, callback]) returns a readable stream of events for the given topic

  • topic is a topic to capture by the handler
  • Model is a fashion-model whose typeName property is used to determine the topic to capture by the handler
  • Note: if callback is provided, it will return a stream to the callback(stream) and continue cascading flow by returning 'this' reference;

• define(topics | Model [, data|promise|function]) defines a producer for the given topic or an array of topics

  • topics is a single topic or an array of topics to broadcast the data with.
  • Model is a fashion-model whose typeName property is used to determine the topic to broadcast the data with
  • data will be immediately published under the given topics into the flow; in case an error object is passed, the flow will be stopped and an 'error' event will be broadcasted into the flow.
  • promise will publish data once resolved; in case of reject, the flow will be stopped and an 'error' event will be broadcasted into the flow.
  • function(publisher, flow) will be called immediately
    • publisher is a convenience object to publish events for the assigned topic in async use-case
    • flow is an instance of the current flow.
    • if function returns a non-undefined value, it will be published under the assigned topic immediately; this is useful in a sync flow.