# all files / lib/spdy-transport/ utils.js

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89.29% Branches 25/28
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     'use strict'

    var util = require('util')

    function QueueItem () {
      this.prev = null
      this.next = null
    }
    exports.QueueItem = QueueItem

    function Queue () {
      QueueItem.call(this)

      this.prev = this
      this.next = this
    }
    util.inherits(Queue, QueueItem)
    exports.Queue = Queue

    Queue.prototype.insertTail = function insertTail (item) {
      item.prev = this.prev
      item.next = this
      item.prev.next = item
      item.next.prev = item
    }

    Queue.prototype.remove = function remove (item) {
      var next = item.next
      var prev = item.prev

      item.next = item
      item.prev = item
      next.prev = prev
      prev.next = next
    }

    Queue.prototype.head = function head () {
      return this.next
    }

    Queue.prototype.tail = function tail () {
      return this.prev
    }

    Queue.prototype.isEmpty = function isEmpty () {
      return this.next === this
    }

    Queue.prototype.isRoot = function isRoot (item) {
      return this === item
    }

    function LockStream (stream) {
      this.locked = false
      this.queue = []
      this.stream = stream
    }
    exports.LockStream = LockStream

    LockStream.prototype.write = function write (chunks, callback) {
      var self = this

      // Do not let it interleave
      if (this.locked) {
        this.queue.push(function () {
          return self.write(chunks, callback)
        })
        return
      }

      this.locked = true

      function done (err, chunks) {
        self.stream.removeListener('error', done)

        self.locked = false
        if (self.queue.length > 0) { self.queue.shift()() }
        callback(err, chunks)
      }

      this.stream.on('error', done)

      // Accumulate all output data
      var output = []
      function onData (chunk) {
        output.push(chunk)
      }
      this.stream.on('data', onData)

      function next (err) {
        self.stream.removeListener('data', onData)
        Iif (err) {
          return done(err)
        }

        done(null, output)
      }

      for (var i = 0; i < chunks.length - 1; i++) { this.stream.write(chunks[i]) }

      if (chunks.length > 0) {
        this.stream.write(chunks[i], next)
      } else { process.nextTick(next) }

      if (this.stream.execute) {
        this.stream.execute(function (err) {
          Iif (err) { return done(err) }
        })
      }
    }

    // Just finds the place in array to insert
    function binaryLookup (list, item, compare) {
      var start = 0
      var end = list.length

      while (start < end) {
        var pos = (start + end) >> 1
        var cmp = compare(item, list[pos])

        if (cmp === 0) {
          start = pos
          end = pos
          break
        } else if (cmp < 0) {
          end = pos
        } else {
          start = pos + 1
        }
      }

      return start
    }
    exports.binaryLookup = binaryLookup

    function binaryInsert (list, item, compare) {
      var index = binaryLookup(list, item, compare)

      list.splice(index, 0, item)
    }
    exports.binaryInsert = binaryInsert

    function binarySearch (list, item, compare) {
      var index = binaryLookup(list, item, compare)

      if (index >= list.length) {
        return -1
      }

      if (compare(item, list[index]) === 0) {
        return index
      }

      return -1
    }
    exports.binarySearch = binarySearch

    function Timeout (object) {
      this.delay = 0
      this.timer = null
      this.object = object
    }
    exports.Timeout = Timeout

    Timeout.prototype.set = function set (delay, callback) {
      this.delay = delay
      this.reset()
      if (!callback) { return }

      Iif (this.delay === 0) {
        this.object.removeListener('timeout', callback)
      } else {
        this.object.once('timeout', callback)
      }
    }

    Timeout.prototype.reset = function reset () {
      if (this.timer !== null) {
        clearTimeout(this.timer)
        this.timer = null
      }

      if (this.delay === 0) { return }

      var self = this
      this.timer = setTimeout(function () {
        self.timer = null
        self.object.emit('timeout')
      }, this.delay)
    }