public void KeyedSharedPoolTest()
{
var allocations = new List <int>();
var pool = new KeyedSharedPool <byte[], int>(
size =>
{
allocations.Add(size); // to track allocations
return(new byte[size]);
},
1);
// allocate and release a 10-byte array
var byte10 = pool.GetOrCreate(10);
Assert.AreEqual(10, byte10.Resource.Length);
Assert.AreEqual(1, allocations.Count); // new allocation
Assert.AreEqual(10, allocations[0]);
byte10.Dispose();
// allocate and release a 20-byte array
var byte20 = pool.GetOrCreate(20);
Assert.AreEqual(20, byte20.Resource.Length);
Assert.AreEqual(2, allocations.Count); // new allocation
Assert.AreEqual(20, allocations[1]);
byte20.Dispose();
// request another 10-byte array without releasing
byte10 = pool.GetOrCreate(10);
Assert.AreEqual(10, byte10.Resource.Length);
Assert.AreEqual(2, allocations.Count); // no new allocation
// request another 20-byte array without releasing
byte20 = pool.GetOrCreate(20);
Assert.AreEqual(20, byte20.Resource.Length);
Assert.AreEqual(2, allocations.Count); // no new allocation
// allocate another 20-byte array
var byte20_2 = pool.GetOrCreate(20);
Assert.AreEqual(20, byte20_2.Resource.Length);
Assert.AreEqual(3, allocations.Count); // new allocation
Assert.AreEqual(20, allocations[2]);
// allocate another 10-byte array
var byte10_2 = pool.GetOrCreate(10);
Assert.AreEqual(10, byte10_2.Resource.Length);
Assert.AreEqual(4, allocations.Count); // new allocation
Assert.AreEqual(10, allocations[3]);
// release all instances
byte10.Dispose();
byte20.Dispose();
byte10_2.Dispose();
byte20_2.Dispose();
}
/// <summary>
/// Retrieves an image from the pool
/// </summary>
/// <param name="width">Width of image requested</param>
/// <param name="height">Height of image requested</param>
/// <param name="pixelFormat">Pixel format for requested image</param>
/// <returns>Returns an image frmo the pool</returns>
public static Shared <Image> GetOrCreate(int width, int height, PixelFormat pixelFormat)
{
return(KeyedSharedPool <Image, ValueTuple <long, PixelFormat> > .GetOrCreate(ValueTuple.Create((long)(width * height), pixelFormat), () => Image.Create(width, height, pixelFormat)));
}
