public void Update_an_object_using_precompiled_accessors()
{
var bingo = new Bingo
{
X = 3,
Y = 4
};
var x = CompiledAccessors.CompiledGetter(typeof(Bingo), "X")(bingo);
Assert.AreEqual(3, x);
CompiledAccessors.CompiledSetter(typeof(Bingo), "X")(bingo, 4);
x = CompiledAccessors.CompiledGetter(typeof(Bingo), "X")(bingo);
Assert.AreEqual(4, x);
var smartSetter = CompiledAccessors.CompiledSmartSetter(typeof(Bingo), "Message");
Assert.IsNotNull(smartSetter);
// a smart setter sets the property only if value is different
var changed = smartSetter(bingo, "test");
Assert.IsTrue(changed);
changed = smartSetter(bingo, "test");
Assert.IsFalse(changed);
changed = smartSetter(bingo, "different");
Assert.IsTrue(changed);
}
/// <summary>
/// </summary>
/// <param name="propertyName"></param>
/// <param name="root">the root (entry point) of the object graph</param>
/// <param name="parent">the owner of the property</param>
/// <param name="value"></param>
/// <returns></returns>
public ICollection <string> SetProperty(string propertyName, object root, object parent, object value)
{
var modified = new HashSet <string>();
var smartSetter = CompiledAccessors.CompiledSmartSetter(parent.GetType(), propertyName);
var hasChanged = smartSetter(parent, value);
if (hasChanged)
{
modified.Add(propertyName);
Cascade(propertyName, root, modified, 1);
}
return(modified);
}
public void Precompiled_accessors_are_much_faster_then_reflexion_based_ones()
{
var property = typeof(Bingo).GetProperty("X");
var getter = CompiledAccessors.CompiledGetter(typeof(Bingo), "X");
var setter = CompiledAccessors.CompiledSetter(typeof(Bingo), "X");
var smartSetter = CompiledAccessors.CompiledSmartSetter(typeof(Bingo), "X");
var bingo = new Bingo
{
X = 3,
Y = 4
};
var time0 = TimeInMilliseconds(i =>
{
var before = (int)getter(bingo);
setter(bingo, before + 1);
}, 1000000);
Console.WriteLine("Compiled took {0} ms", time0);
var time1 = TimeInMilliseconds(i =>
{
var before = (int)property.GetValue(bingo);
property.SetValue(bingo, before + 1);
}, 1000000);
Console.WriteLine("Reflexion-based took {0} ms", time1);
var time2 = TimeInMilliseconds(i => smartSetter(bingo, i), 1000000);
Console.WriteLine("Compiled smart seter took {0} ms", time2);
Assert.Less(time2 * 5, time1); // compiled smart setters should be faster
Assert.Less(time0 * 5, time1); // compiled accessors should be much faster than reflexion based ones
}