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63 lines
2 KiB
CoffeeScript
63 lines
2 KiB
CoffeeScript
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Heap = require "heap"
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module.exports = ProjectIterator =
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class ProjectIterator
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constructor: (packs, @before, @getPackByIdFn) ->
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byEndTs = (a,b) -> (b.meta.end_ts - a.meta.end_ts) || (a.fromIndex - b.fromIndex)
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@packs = packs.slice().sort byEndTs
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@queue = new Heap(byEndTs)
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next: (callback) ->
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# what's up next
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#console.log ">>> top item", iterator.packs[0]
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iterator = this
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before = @before
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queue = iterator.queue
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opsToReturn = []
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nextPack = iterator.packs[0]
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lowWaterMark = nextPack?.meta.end_ts || 0
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nextItem = queue.peek()
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#console.log "queue empty?", queue.empty()
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#console.log "nextItem", nextItem
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#console.log "nextItem.meta.end_ts", nextItem?.meta.end_ts
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#console.log "lowWaterMark", lowWaterMark
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while before? and nextPack?.meta.start_ts > before
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# discard pack that is outside range
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iterator.packs.shift()
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nextPack = iterator.packs[0]
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lowWaterMark = nextPack?.meta.end_ts || 0
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if (queue.empty() or nextItem?.meta.end_ts <= lowWaterMark) and nextPack?
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# retrieve the next pack and populate the queue
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return @getPackByIdFn nextPack.project_id, nextPack.doc_id, nextPack._id, (err, pack) ->
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return callback(err) if err?
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iterator.packs.shift() # have now retrieved this pack, remove it
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#console.log "got pack", pack
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for op in pack.pack when (not before? or op.meta.end_ts < before)
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#console.log "adding op", op
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op.doc_id = nextPack.doc_id
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op.project_id = nextPack.project_id
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queue.push op
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# now try again
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return iterator.next(callback)
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#console.log "nextItem", nextItem, "lowWaterMark", lowWaterMark
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while nextItem? and (nextItem?.meta.end_ts > lowWaterMark)
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opsToReturn.push nextItem
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queue.pop()
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nextItem = queue.peek()
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#console.log "queue empty?", queue.empty()
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#console.log "nextPack", nextPack?
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if queue.empty() and not nextPack? # got everything
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iterator._done = true
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callback(null, opsToReturn)
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done: () ->
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return @_done
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