Logging aspect

RSS

This aspect allows logging some diagnostic information with minimum efforts. All you need to do is to decorate your class with the Log attribute. If you have a class hierarchy you can ecorate only your base class. Diagnostic information will be logged for all virtual and abstract members of your abstract class.

LoggingAspect.cs

using System;
using System.Threading;

using NUnit.Framework;

using BLToolkit.Aspects;
using BLToolkit.Reflection;

namespace HowTo.Aspects
{
    [TestFixture]
    public class LoggingAspectTest
    {
        [Log]
        public abstract class TestClass
        {
            // Here we customize the logging settings.
            // This call will be logged in spite of default settings.
            //
            [Log(MinCallTime=50)]
            public virtual void Test1(int i)
            {
                Thread.Sleep(100);
            }

            // This call is not going to be logged (see default settings below).
            //
            public virtual void Test2(DateTime dt)
            {
                Thread.Sleep(100);
            }

            // By default exception calls are logged.
            //
            public virtual void Test3(string s)
            {
                throw new ApplicationException("Test exception.");
            }
        }

        [Test]
        public void Test()
        {
            // By setting MinCallTime to some value, we prevent logging any call
            // which is shorter than the provided value.
            //
            LoggingAspect.MinCallTime = 1000;

            TestClass t = TypeAccessor<TestClass>.CreateInstance();

            t.Test1(1);
            t.Test2(DateTime.Now);

            try
            {
                t.Test3("3");
            }
            catch
            {
            }
        }
    }
}

Here is the logging output.

4/20/2008 11:19:44 PM: HowTo.Aspects.LoggingAspectTest.BLToolkitExtension.TestClass.Test1(1) - 105 ms.

4/20/2008 11:19:46 PM: HowTo.Aspects.LoggingAspectTest.BLToolkitExtension.TestClass.Test3("3") - 1507 ms
                       with exception 'System.ApplicationException' - "Test exception.".