eventric/src/global_context/global_context.coffee

behavior-first application development

# TODO: Simple approach for global projections without changing the Projection service. Refactor when adding EventStore
domainEventService = require 'eventric/domain_event/domain_event_service'

class GlobalContext

  constructor: ->
    @name = 'Global'


  findDomainEventsByName: (findArguments...) ->
    findDomainEventsByNamePromise = Promise.resolve()

    domainEventsByContext = []

    @_getAllContexts().forEach (context) ->
      findDomainEventsByNamePromise = findDomainEventsByNamePromise.then ->
        context.findDomainEventsByName findArguments...
        .then (domainEvents) ->
          domainEventsByContext.push domainEvents


    return findDomainEventsByNamePromise
    .then =>
      domainEvents = @_combineDomainEventsByContext domainEventsByContext
      domainEvents = domainEventService.sortDomainEventsById domainEvents
      return domainEvents


  subscribeToDomainEvent: (eventName, domainEventHandler) ->
    subscribeToDomainEvents = @_getAllContexts().map (context) ->
      context.subscribeToDomainEvent eventName, domainEventHandler
    Promise.all subscribeToDomainEvents


  _getAllContexts: ->
    eventric = require '../eventric'
    contextNames = eventric.getRegisteredContextNames()
    contextNames.map (contextName) ->
      eventric.remoteContext contextName


  _combineDomainEventsByContext: (domainEventsByContext) ->
    domainEventsByContext.reduce (allDomainEvents, contextDomainEvents) ->
      allDomainEvents.concat contextDomainEvents
    , []


module.exports = GlobalContext