I created a simple performance testing class that is a singlton and it uses generics PerformanceTesting<T>.Instance
(Full source code available on my blog post, but it is not the most up to date version http://www.createdbyx.com/post/2013/03/27/Code-Snippets-12-%E2%80%93-Performance-Testing.aspx )
This allows the developer to use what ever they are more comfortable using as the accessor key whether it be a string, integer or enum etc.
So everything worked great but I am attempting to build a performance reporting window and I want the ability to collect performance data from all the instanciated singlton instances wheather it be PerformanceTesting<int> or PerformanceTesting<string>
etc.
The only way I figure I can do this is through the use of reflection. I should also mention that the PerformanceTesting class makes use of another class to track the various types that are being used as accessor keys to the PerformanceTesting<T>
singleton(s).
/// <summary>
/// Provides a lock object when a singleton reference need to be instantiated.
/// </summary>
private static object lockObject = new object();
/// <summary>
/// Gets a singleton instance of the <see cref="PerformanceTesting{T}"/> class.
/// </summary>
public static PerformanceTesting<T> Instance
{
get
{
if (singleton == null)
{
lock (lockObject)
{
singleton = new PerformanceTesting<T>();
PerformanceTestingTypes.Register<T>();
}
}
return singleton;
}
}
A stripped down simplified version of PerformanceTestingTypes class is ...
public class PerformanceTestingTypes
{
private static PerformanceTestingTypes singleton;
private List<Type> types = new List<Type>();
public static PerformanceTestingTypes Instance
{
get
{
return singleton ?? (singleton = new PerformanceTestingTypes());
}
}
public static Type[] GetTypes()
{
var values = new Type[Instance.types.Count];
Instance.types.CopyTo(values, 0);
return values;
}
public static void Register<T>()
{
Instance.types.Add(typeof(T));
}
// can't return PerformanceTesting<T> because T is of System.Type not the actual accessor type.
public static PerformanceTesting<T> GetTesting<T>(T type)
{
var rootType = typeof(PerformanceTesting<>); // this is wrong but placed for example purposes!!!
var prop = rootType.GetProperty("Instance");
var reference = prop.GetGetMethod().Invoke(null, null);
return reference; // compile error because Invoke returns type System.Object
}
}
I am using this method to try and report out the results to the debug log ...
/// <summary>
/// If the PERFORMANCE symbol is available will report the performance metric information out to the console.
/// </summary>
public static void ReportPerformanceTimes()
{
var result = string.Empty;
foreach (var type in PerformanceTestingTypes.GetTypes())
{
var perf = PerformanceTestingTypes.GetTesting(type);
var keyNames = PerformanceTestingTypes.GetKeyNames(type);
foreach (var name in keyNames)
{
var key = PerformanceTestingTypes.ConvertKey(name, type);
result += string.Format("{0} - Total: {1}ms Average: {2} Count: {3}\r\n", name, perf.TotalMilliseconds(key), perf.AverageMilliseconds(key), perf.GetStartCount(key));
}
result += string.Format("Total Performance Times - Total: {0}ms", perf.TotalMilliseconds(perf.GetKeys()));
}
Debug.Log(result);
}
My problem I'm having lies within the PerformanceTestingTypes.GetTesting() method. I need to return a reference to a specific instance of a generic singleton using only a System.Type that references the actual type that the singleton uses as it's accessor key.
var type = typeof(int); // the accessor key type that was used
// from the 'type' variable get a reference to singleton
var reference = PerformanceTesting<int>.Instance;
Or to put it another way how would I use reflection to get the type for PerformanceTesting<int>
if all I have is a variable 'type' that is a System.Type that refers to int.
Technically I thought I could try and just create and build a single C# class inside of a string and compile that string into a in memory assembly then call the class to get the reference to the singleton I need but it seems overkill and I suspect I may run into the same or similar issues as well as with casting.
Is this even possible or am I trying to do the impossible? Hope my question makes sense. My brain has decided to take a hiatus on this one. :(
Try this:
var performanceTestingType = typeof(PerformanceTesting<>);
Type[] typeArgs = { typeof(int) };
var genericType = performanceTestingType.MakeGenericType(typeArgs);
object performanceTestingOfTypeInt = Activator.CreateInstance(genericType);
MSDN article here
For those of you who landed on this page looking for a similar answer I am providing the resulting method for how I achieved my goal thanks to jaywayco's answer.
private void DrawPerformanceMetricsFlatList()
{
foreach (var type in PerformanceTestingTypes.GetTypes())
{
var performanceTestingType = typeof(PerformanceTesting<>);
Type[] typeArgs = { type };
var genericType = performanceTestingType.MakeGenericType(typeArgs);
var data = genericType.GetProperty("Instance", BindingFlags.GetProperty | BindingFlags.Static | BindingFlags.Public).GetGetMethod().Invoke(null, null);
var totalMilli = data.GetType().GetMethod("TotalMilliseconds", new[] { type });
var avgMilli = data.GetType().GetMethod("AverageMilliseconds", new[] { type });
var totalTicks = data.GetType().GetMethod("TotalTicks", new[] { type });
var avgTicks = data.GetType().GetMethod("AverageTicks", new[] { type });
var startCount = data.GetType().GetMethod("GetStartCount", new[] { type });
var fromConverter = data.GetType().GetProperty("ConvertFromStringCallback");
// var toConverter = data.GetType().GetProperty("ConvertToStringCallback", new[] { type });
var func = fromConverter.GetGetMethod().Invoke(data, null);
var invoker = func.GetType().GetMethod("Invoke");
var keyNames = PerformanceTestingTypes.GetKeyNames(type);
switch (this.sortIndex)
{
case 1:
keyNames = keyNames.OrderBy(x => x).ToArray();
break;
case 2:
keyNames = keyNames.OrderByDescending(x => totalTicks.Invoke(data, new[] { invoker.Invoke(func, new[] { x }) })).ToArray();
break;
case 3:
keyNames = keyNames.OrderByDescending(x => avgTicks.Invoke(data, new[] { invoker.Invoke(func, new[] { x }) })).ToArray();
break;
case 4:
keyNames = keyNames.OrderByDescending(x => startCount.Invoke(data, new[] { invoker.Invoke(func, new[] { x }) })).ToArray();
break;
}
ControlGrid.DrawGenericGrid((items, index, style, options) =>
{
var value = items[index];
var selected = GUILayout.Toggle(this.selectedIndex == index, value, style);
if (selected)
{
this.selectedIndex = index;
var key = invoker.Invoke(func, new[] { value });
this.performanceData = string.Format("{0}\r\nTotal: {1}ms ({4} ticks)\r\nAverage: {2}ms ({5} ticks)\r\nCount: {3}\r\n", value,
totalMilli.Invoke(data, new[] { key }),
avgMilli.Invoke(data, new[] { key }),
startCount.Invoke(data, new[] { key }),
totalTicks.Invoke(data, new[] { key }),
avgTicks.Invoke(data, new[] { key }));
}
return value;
}, keyNames, 1, GUI.skin.button);
}
}
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