MessageQueue.coffee
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#-------------------------------------------------------------------------------
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#-------------------------------------------------------------------------------
_ = require 'underscore'
utils = require './utils'
#-------------------------------------------------------------------------------
module.exports = utils.registerClass class MessageQueue
#---------------------------------------------------------------------------
constructor: () ->
@messages = []
@closed = false
@callback = null
@timer = null
_.bindAll @, '_timerExpired', '_updated'
#---------------------------------------------------------------------------
shutdown: () ->
return if @closed
@closed = true
clearTimeout @timer if @timer
@callback.call(null, @messages) if @callback
@callback = null
@messages = null
@timer = null
#---------------------------------------------------------------------------
push: (message) ->
return if @closed
@messages.push message
process.nextTick @_updated
#---------------------------------------------------------------------------
pullAll: (timeout, callback) ->
return callback.call(null, null) if @closed
return callback.call(null, []) if @callback
if @messages.length
callback.call(null, @messages)
@messages = []
return
@callback = callback
@timer = setTimeout @_timerExpired, timeout
#---------------------------------------------------------------------------
_timerExpired: () ->
@_updated()
#---------------------------------------------------------------------------
_updated: () ->
return if @closed
return if !@callback
callback = @callback
messages = @messages
clearTimeout @timer if @timer
@callback = null
@messages = []
@timer = null
callback.call(null, messages)