public static void Main() {
var cancel = new CancellationTokenSource();
var task = new Task(()=> {
var test = new ConcurrencyTest();
test.Concurrency();
Console.WriteLine("Disconnecting...");
}, cancel.Token);
task.Start();
task.Wait();
System.Threading.Thread.Sleep(1000 * 60 * 30);
}
/// <summary>
/// 测试高并发下单个委托的执行时间
/// </summary>
/// <param name="count">并发计数</param>
/// <param name="cTest">委托</param>
/// <param name="sizeThread">一个线程执行的估计时间，可以估计的大些，默认是6毫秒</param>
/// <returns></returns>
public static double StartTest(int count, ConcurrencyTest cTest, int sizeThread = 6)
{
#region 为保证之后取得的时间准确度，初始化
ConcurrentLock cLock = new ConcurrentLock();
ConcurrentLock autoLock = new ConcurrentLock();
GC.Collect();
GC.Collect();
GC.Collect();
GC.Collect();
#endregion
#region 测算1亿次if时间，并按比例计算出时间差
int max = ((count + 1) * count) / 2;//if被操作的总次数
double stime = new TimeSpan(DateTime.Now.Ticks).TotalMilliseconds;
for (int i = 0; i < 100000000; i++)
{
if (cLock.EndTime == -1)
{
}
}
double etime = new TimeSpan(DateTime.Now.Ticks).TotalMilliseconds;
double ifSpan = ((etime - stime) / 100000000d) * max;
#endregion
#region 清理内存使用，再初始化
GC.Collect();
GC.Collect();
GC.Collect();
GC.Collect();
Thread.Sleep(3000);
#endregion
#region 执行，执行原理如下，因为线程开启的时间，各个线程之间存在时间差，现在采取一种办法，使其时间差只是一个if判断
List <Thread> threads = new List <Thread>();
int current = 0;
for (int i = 0; i < count; i++)
{
var thread = new Thread(() =>
{
//开始，挡路所有线程
lock (autoLock)
{
if (autoLock.StartTime == -1)
{
autoLock.StartTime = new TimeSpan(DateTime.Now.Ticks).TotalMilliseconds;
Thread.Sleep(sizeThread * count);
}
}
//释放挡路的路牌
#region 委托执行
cTest();
#endregion
//结束使用原子计数器
Interlocked.Increment(ref current);
if (current >= count)
{
//此时所有线程都运行完该委托
autoLock.EndTime = new TimeSpan(DateTime.Now.Ticks).TotalMilliseconds;
}
});
thread.IsBackground = true;
thread.SetApartmentState(ApartmentState.MTA);
threads.Add(thread);
}
foreach (var t in threads)
{
t.Start();
}
foreach (var t in threads)
{
t.Join();
}
#endregion
return((double)(autoLock.EndTime - autoLock.StartTime - sizeThread * count - ifSpan) / (double)count);
}
public void ConcurrencyOnUpdateDelete()
{
ConcurrencyTestCollection collection = new ConcurrencyTestCollection();
switch (collection.es.Connection.ProviderSignature.DataProviderName)
{
case "EntitySpaces.SqlServerCeProvider":
case "EntitySpaces.SqlServerCe4Provider":
Assert.Ignore("Not implemented for SqlCe");
break;
default:
try
{
using (esTransactionScope scope = new esTransactionScope())
{
// Setup
ConcurrencyTest entity = new ConcurrencyTest();
if (entity.LoadByPrimaryKey("abc"))
{
entity.MarkAsDeleted();
entity.Save();
}
entity = new ConcurrencyTest();
entity.Id = "abc";
entity.Name = "Test 1";
entity.Save();
// Test
entity = new ConcurrencyTest();
entity.LoadByPrimaryKey("abc");
entity.Name = "Test 2";
ConcurrencyTest entity2 = new ConcurrencyTest();
entity2.LoadByPrimaryKey("abc");
entity2.MarkAsDeleted();
entity.Save();
entity2.Save();
Assert.Fail("Concurrency Exception not thrown.");
}
}
catch (EntitySpaces.Interfaces.esConcurrencyException cex)
{
switch (collection.es.Connection.ProviderSignature.DataProviderName)
{
case "EntitySpaces.MSAccessProvider":
case "EntitySpaces.MySqlClientProvider":
case "EntitySpaces.SQLiteProvider":
case "EntitySpaces.SqlServerCeProvider":
case "EntitySpaces.SybaseSqlAnywhereProvider":
case "EntitySpaces.VistaDBProvider":
case "EntitySpaces.VistaDB4Provider":
Assert.AreEqual("Error in", cex.Message.Substring(0, 8));
break;
case "EntitySpaces.OracleClientProvider":
Assert.AreEqual("ORA-20101", cex.Message.Substring(0, 9));
break;
default:
Assert.AreEqual("Update failed", cex.Message.Substring(0, 13));
break;
}
}
finally
{
// Cleanup
ConcurrencyTest entity = new ConcurrencyTest();
if (entity.LoadByPrimaryKey("abc"))
{
entity.MarkAsDeleted();
entity.Save();
}
}
break;
}
}