29 lines
765 B
CoffeeScript
29 lines
765 B
CoffeeScript
DLList = require "./DLList"
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Events = require "./Events"
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class Queues
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constructor: (num_priorities) ->
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@Events = new Events @
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@_length = 0
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@_lists = for i in [1..num_priorities] then new DLList (=> @incr()), (=> @decr())
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incr: -> if @_length++ == 0 then @Events.trigger "leftzero"
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decr: -> if --@_length == 0 then @Events.trigger "zero"
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push: (job) -> @_lists[job.options.priority].push job
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queued: (priority) -> if priority? then @_lists[priority].length else @_length
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shiftAll: (fn) -> @_lists.forEach (list) -> list.forEachShift fn
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getFirst: (arr=@_lists) ->
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for list in arr
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return list if list.length > 0
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[]
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shiftLastFrom: (priority) -> @getFirst(@_lists[priority..].reverse()).shift()
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module.exports = Queues
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