C#压力测试 – 模拟对给定共享资源的多次访问

[Test]
public void SimpleStressTest()
{
    bool wasExceptionThrown = false;
    var threads = new Thread[100];
    for(int i = 0; i < 100; i++)
    {
        threads[i] = 
            new Thread(new ThreadStart((Action)(() =>
            {
                try
                {                        
                    AccessDB();
                }
                catch(Exception)
                {
                    wasExceptionThrown = true;
                }

            })));
    }

    for(int i = 0; i < 100; i++)
    {
        threads[i].Start();
    }    
    for(int i = 0; i < 100; i++)
    {
        threads[i].Join();
    }

    Assert.That(wasExceptionThrown,Is.False);
}

由于无法控制线程流,因此该测试不具有确定性.例如,如果要确保可以同时打开100个连接,可以在AccessDB()的逻辑中放置一个钩子,这将强制它在关闭与DB的连接之前等待.

例如,而不是以前的线程操作：

try
{                        
    AccessDB(sychObject);
}
catch(Exception)
{
    wasExceptionThrown = true;
}

启动所有线程后,确保在sychObject上等待100个线程,然后释放它并加入线程.通过将CloseConnection()(例如)的逻辑设置为virtual并将该测试写入在CloseConnection()中等待的继承类,可以实现相同的目的.例如：

public class DataBase
{
    public void AccessDB()
    {
        // Do logic here before closing connection
        CloseConnection();
    }

    protected virtual void CloseConnection()
    {
        // Real Logic to close connection
    }
}

public class FakeDataBase : DataBase
{
    ManualResetEvent sychObject;

    public FakeDataBase(ManualResetEvent sychObject)
    {
        this.sychObject = sychObject;
    }

    override protected void CloseConnection()
    {
        sychObject.WaitOne();
        base.CloseConnection();
    }
}