74 lines
1.4 KiB
CoffeeScript
74 lines
1.4 KiB
CoffeeScript
# From: http://dev.bizo.com/2011/12/promises-in-javascriptcoffeescript.html
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class Promise
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@when: (tasks...) ->
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num_uncompleted = tasks.length
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args = new Array(num_uncompleted)
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promise = new Promise()
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for task, task_id in tasks
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((task_id) ->
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task.then(() ->
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args[task_id] = Array.prototype.slice.call(arguments)
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num_uncompleted--
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promise.complete.apply(promise, args) if num_uncompleted == 0
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)
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)(task_id)
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return promise
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constructor: ->
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@resolved = false
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@end_promise = null
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@result = null
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@callbacks = []
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resolve: ->
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if @resolved
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return false
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@resolved = true
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@data = arguments
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if not arguments.length
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@data = [true]
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@result = @data[0]
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for callback in @callbacks
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back = callback.apply callback, @data
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if @end_promise
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@end_promise.resolve(back)
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fail: ->
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@resolve(false)
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then: (callback) ->
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if @resolved == true
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callback.apply callback, @data
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return
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@callbacks.push callback
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@end_promise = new Promise()
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window.Promise = Promise
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###
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s = Date.now()
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log = (text) ->
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console.log Date.now()-s, Array.prototype.slice.call(arguments).join(", ")
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log "Started"
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cmd = (query) ->
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p = new Promise()
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setTimeout ( ->
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p.resolve query+" Result"
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), 100
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return p
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back = cmd("SELECT * FROM message").then (res) ->
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log res
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return "Return from query"
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.then (res) ->
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log "Back then", res
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log "Query started", back
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### |