Channel.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'
channelManager = require './channelManager'
messageHandler = require './messageHandler'
MessageQueue = require './MessageQueue'
AnonymousId = 'anonymous'
#-------------------------------------------------------------------------------
module.exports = utils.registerClass class Channel
#---------------------------------------------------------------------------
constructor: (@pathPrefix, @id, @remoteAddress, @isClient) ->
prefix = if @isClient then 'c-' else 't-'
@name = "#{prefix}#{utils.getNextSequenceNumber()}"
@messageQueue = new MessageQueue
@isClosed = false
@connections = []
@isTarget = !@isClient
@readTimeout = utils.options.readTimeout * 1000
@id = AnonymousId if !@id
@description =
channel: @name
id: @id
hostName: @remoteAddress
remoteAddress: @remoteAddress
@updateLastRead()
channelManager.created @
#---------------------------------------------------------------------------
close: () ->
return if @isClosed
channelManager.destroyed @
@isClosed = true
@messageQueue.shutdown()
#---------------------------------------------------------------------------
sendCallback: (intfName, callbackId, args...) ->
return if !callbackId
args.unshift callbackId
@sendMessage intfName, 'sendCallback', args...
#---------------------------------------------------------------------------
sendMessage: (intfName, method, args...) ->
message = genJSON
interface: intfName
method: method
args: args
@messageQueue.push message
#---------------------------------------------------------------------------
handleMessages: (messages) ->
for message in messages
message = parseJSON(message)
continue if !message
messageHandler.handleMessage @, message
#---------------------------------------------------------------------------
getMessages: (callback) ->
@updateLastRead()
return callback.call(null, null) if @isClosed
@messageQueue.pullAll @readTimeout, callback
#---------------------------------------------------------------------------
updateLastRead: () ->
@lastRead = (new Date).valueOf()
#---------------------------------------------------------------------------
toString: () ->
connections = _.map(@connections, (val) -> val.name).join(',')
"Channel(#{@name}, closed:#{@isClosed}, connections:[#{connections}])"
#-------------------------------------------------------------------------------
parseJSON = (message) ->
try
return JSON.parse(message)
catch e
return null
#-------------------------------------------------------------------------------
genJSON = (message) ->
try
return JSON.stringify(message)
catch e
return null