States.coffee
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BottleneckError = require "./BottleneckError"
class States
constructor: (@status) ->
@_jobs = {}
@counts = @status.map(-> 0)
next: (id) ->
current = @_jobs[id]
next = current + 1
if current? and next < @status.length
@counts[current]--
@counts[next]++
@_jobs[id]++
else if current?
@counts[current]--
delete @_jobs[id]
start: (id) ->
initial = 0
@_jobs[id] = initial
@counts[initial]++
remove: (id) ->
current = @_jobs[id]
if current?
@counts[current]--
delete @_jobs[id]
current?
jobStatus: (id) -> @status[@_jobs[id]] ? null
statusJobs: (status) ->
if status?
pos = @status.indexOf status
if pos < 0
throw new BottleneckError "status must be one of #{@status.join ', '}"
k for k,v of @_jobs when v == pos
else
Object.keys @_jobs
statusCounts: -> @counts.reduce(((acc, v, i) => acc[@status[i]] = v; acc), {})
module.exports = States