[问题似乎有点长,但请耐心等待。它有样品来源问题的解释]如何在使用多个代理客户端时修复WCF中的basicHttpBinding?
考虑下面的代码基本上是一个WCF主持人:
[ServiceContract (Namespace = "http://www.mightycalc.com")]
interface ICalculator
{
[OperationContract]
int Add (int aNum1, int aNum2);
}
[ServiceBehavior (InstanceContextMode = InstanceContextMode.PerCall)]
class Calculator: ICalculator
{
public int Add (int aNum1, int aNum2) {
Thread.Sleep (2000); //Simulate a lengthy operation
return aNum1 + aNum2;
}
}
class Program
{
static void Main (string[] args) {
try {
using (var serviceHost = new ServiceHost (typeof (Calculator))) {
var httpBinding = new BasicHttpBinding (BasicHttpSecurityMode.None);
serviceHost.AddServiceEndpoint (typeof (ICalculator), httpBinding, "http://172.16.9.191:2221/calc");
serviceHost.Open();
Console.WriteLine ("Service is running. ENJOY!!!");
Console.WriteLine ("Type 'stop' and hit enter to stop the service.");
Console.ReadLine();
if (serviceHost.State == CommunicationState.Opened)
serviceHost.Close();
}
}
catch (Exception e) {
Console.WriteLine (e);
Console.ReadLine();
}
}
}
而且WCF客户端程序是:
class Program
{
static int COUNT = 0;
static Timer timer = null;
static void Main (string[] args) {
var threads = new Thread[10];
for (int i = 0; i < threads.Length; i++) {
threads[i] = new Thread (Calculate);
threads[i].Start (null);
}
timer = new Timer (o => Console.WriteLine ("Count: {0}", COUNT), null, 1000, 1000);
Console.ReadLine();
timer.Dispose();
}
static void Calculate (object state)
{
var c = new CalculatorClient ("BasicHttpBinding_ICalculator");
c.Open();
while (true) {
try {
var sum = c.Add (2, 3);
Interlocked.Increment (ref COUNT);
}
catch (Exception ex) {
Console.WriteLine ("Error on thread {0}: {1}", Thread.CurrentThread.Name, ex.GetType());
break;
}
}
c.Close();
}
}
基本上,我创建10个代理客户端,然后在单独的线程上重复调用Add service方法。现在,如果我同时运行的应用程序和用netstat观察打开的TCP连接,我发现:
- 如果客户端和服务器的同一台机器上运行,TCP连接数等于代理对象的数量。这意味着所有请求都是并行服务的。这很好。
- 如果我在一台单独的机器上运行服务器,我发现无论创建的代理对象的数量是多少,都会打开最多2个TCP连接。只有两个请求并行运行。它严重伤害了处理速度。
- 如果我切换到net.tcp绑定,一切正常(每个代理对象的一个单独的TCP连接,即使它们在不同的机器上运行)。
我很困惑,无法让basicHttpBinding使用更多的TCP连接。我知道这是一个很长的问题,但请帮助!
在配置文件中... – 2010-03-17 10:18:40