CoffeeScript 双向客户端
问题
你想通过网络提供持续的服务,与客户保持持续的联系。
解决方案
创建一个双向TCP客户机。
在 Node.js 中
net = require 'net'
domain = 'localhost'
port = 9001
ping = (socket, delay) ->
console.log "Pinging server"
socket.write "Ping"
nextPing = -> ping(socket, delay)
setTimeout nextPing, delay
connection = net.createConnection port, domain
connection.on 'connect', () ->
console.log "Opened connection to #{domain}:#{port}"
ping connection, 2000
connection.on 'data', (data) ->
console.log "Received: #{data}"
connection.on 'end', (data) ->
console.log "Connection closed"
process.exit()使用示例
$ coffee bi-directional-client.coffee
Opened connection to localhost:9001
Pinging server
Received: You have 0 peers on this server
Pinging server
Received: You have 0 peers on this server
Pinging server
Received: You have 1 peer on this server
[...]
Connection closed讨论
这个特殊示例发起与服务器联系并在@connection.on 'connect'@处理程序中开启对话。大量的工作在一个真正的用户中，然而@connection.on 'data'@处理来自服务器的输出。@ping@函数递归是为了说明连续与服务器通信可能被真实的用户移除。
另请参阅Bi-Directional Server，Basic Client和Basic Server。
