由于WebSocket允許保持長連接,因此當建立連接后服務器可以主動地向Client發送相關信息.下面通過服務端獲取當前CPU的使用情況主動發送給網頁,讓網頁實時顯示CPU使用情況的曲線圖.該事例的主要功能是包括服務端獲取CPU使和情況和HTML5使用canvas進行曲線圖繪制.
應用效果
實現效果主要是模仿windows的任務管理器,顯示每個核的工作情況.
C#獲取CPU使用情況
可能通過PerformanceCounter來獲取具本CPU線程的使用情況,不過在構建PerformanceCounter前先獲取到CPU對應的線程數量.獲取這個數量可以通過Environment.ProcessorCount屬性獲取,然后遍歷構建每個PerformanceCounter
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int coreCount = Environment.ProcessorCount; for
(int i = 0; i < coreCount; i++) { mCounters.Add(new
PerformanceCounter("Processor", "% Processor Time", i.ToString())); } |
為了方便計數器的處理,簡單地封裝了一個基礎類,完整代碼如下:
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/// <summary> /// Copyright ? henryfan 2012 ///Email: henryfan@msn.com ///HomePage: http://www.ikende.com ///CreateTime: 2012/12/24 15:10:44 /// </summary> public
class ProcessorCounter { private
List<PerformanceCounter> mCounters = new
List<PerformanceCounter>(); public
IList<PerformanceCounter> Counters { get { return
mCounters; } } public
void Open() { int
coreCount = Environment.ProcessorCount; for
(int i = 0; i < coreCount; i++) { mCounters.Add(new
PerformanceCounter("Processor", "% Processor Time", i.ToString())); } } public
ItemUsage[] GetValues() { ItemUsage[] values = new
ItemUsage[mCounters.Count]; for
(int i = 0; i < mCounters.Count; i++) { values[i] = new
ItemUsage(); values[i].ID = i.ToString(); values[i].Name = "CPU "
+i.ToString(); values[i].Percent = mCounters[i].NextValue(); } return
values; } } public
class ItemUsage { public
string Name { get; set; } public
float Percent { get; set; } public
string ID { get; set; } } |
這樣一個用于統計CPU所有線程使用情況計數的類就完成了.
頁面繪制處理
首先定義一些簡單的處理結構
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function ProcessorInfo() { this.Item = null; this.Points = new
Array(); for
(var i = 0; i < 50; i++) { this.Points.push(new
Point(0, 0)); } } function
Point(x, y) { this.X = x; this.Y = y; } |
主要定義線程信息結構,默認初始化50個座標,當在接收服務線程使用情況的時候,構建一個點添加到數組件尾部同時把第一個移走.通過定時繪制這50個點的曲線這樣一個動態的走勢就可以完成了.
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function drawProceessor(item) { var
canvas = document.getElementById('processimg'
+ item.Item.ID); var
context = canvas.getContext('2d'); context.beginPath(); context.rect(0, 0, 200, 110); context.fillStyle = 'black'; context.fill(); context.lineWidth = 2; context.strokeStyle = 'white'; context.stroke(); context.beginPath(); context.moveTo(2, 106); for
(var i = 0; i < item.Points.length; i++) { context.lineTo(4 * i + 2, 110 - item.Points[i].Y - 4); } context.lineTo(200, 106); context.closePath(); context.lineWidth = 1; context.fillStyle = '#7FFF00'; context.fill(); context.strokeStyle = '#7CFC00'; context.stroke(); context.font = '12pt Calibri'; context.fillStyle = 'white'; context.fillText(item.Item.Name, 60, 20); } function
addUploadItem(info) { if
(cpus[info.ID] == null) { var
pinfo = new ProcessorInfo(); pinfo.Item = info; $('<canvas id="processimg'
+ info.ID + '" width="200" height="110"></canvas>').appendTo($('#lstProcessors')); cpus[info.ID] = pinfo; processors.push(pinfo); pinfo.Points.shift(); pinfo.Points.push(new
Point(0, info.Percent)); drawProceessor(pinfo); } else
{ var
pinfo = cpus[info.ID]; pinfo.Points.shift(); pinfo.Points.push(new
Point(0, info.Percent)); } } |
只需要通過定時器來不停地更新線程使用繪制即可.
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setInterval(function
() { for
(var i = 0; i < processors.length; i++) { drawProceessor(processors[i]); } }, 1000); |
服務端
對于服務端其實可以根據自己的需要來使用websocket協議實現,.net 4.5也提供相應的封裝.而這里則使用了beetle對應websocket的擴展協議包,整體代碼如下:
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class
Program : WebSocketJsonServer { static
void Main(string[] args) { TcpUtils.Setup("beetle"); Program server = new
Program(); server.Open(8070); Console.WriteLine("websocket start@8070"); ProcessorCounter counters = new
ProcessorCounter(); counters.Open(); while
(true) { ItemUsage[] items = counters.GetValues(); foreach
(ItemUsage item in
items) { Console.WriteLine("{0}:{1}%", item.Name, item.Percent); } JsonMessage message = new
JsonMessage(); message.type = "cpu useage"; message.data = items; foreach
(TcpChannel channel in
server.Server.GetOnlines()) { channel.Send(message); } System.Threading.Thread.Sleep(995); } System.Threading.Thread.Sleep(-1); } protected
override void OnError(object
sender, ChannelErrorEventArgs e) { base.OnError(sender, e); Console.WriteLine(e.Exception.Message); } protected
override void OnConnected(object
sender, ChannelEventArgs e) { base.OnConnected(sender, e); Console.WriteLine("{0} connected", e.Channel.EndPoint); } protected
override void OnDisposed(object
sender, ChannelDisposedEventArgs e) { base.OnDisposed(sender, e); Console.WriteLine("{0} disposed", e.Channel.EndPoint); } } |
每秒獲取一次CPU的使用情況,并把信息以json的方式發送給當前所有在線的連接.
下載
完整代碼:ProcessorsMonitor.rar (686.02 kb)
演示地址:http://html5.ikende.com/ProcessorsMonitor.htm (瀏覽器使用chrome或IE10)
via:http://www.cnblogs.com/smark/archive/2012/12/25/2833129.html
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