public void TestBasicScenario()
{
var tile1 = new TileInfo {
North = 1
};
var tile2 = new TileInfo {
North = 2
};
var mapByTileName = new Dictionary <TileInfo, short[]>
{
[tile1] = new short[5],
[tile2] = new short[10],
};
var repo = new MockRepository {
GetElevationMapMock = tile => mapByTileName[tile]
};
var cache = new ElevationMapCache(repo, 1000);
//warm cache
Check.That(cache.GetValue(tile1)).IsEqualTo(mapByTileName[tile1]);
Check.That(cache.GetValue(tile2)).IsEqualTo(mapByTileName[tile2]);
//set repo to fail on load
repo.GetElevationMapMock = _ => throw new Exception("at this point, all tiles should be loaded from cache");
Check.That(cache.GetValue(tile1)).IsEqualTo(mapByTileName[tile1]);
Check.That(cache.GetValue(tile2)).IsEqualTo(mapByTileName[tile2]);
}
public void TestCacheInvalidation()
{
var tiles = Enumerable.Range(0, 5)
.Select(i => new TileInfo {
North = i
})
.ToArray();
var mapByTile = tiles.ToDictionary(t => t, _ => new short[25]);
var tileLoadCount = tiles.ToDictionary(t => t, _ => 0);
var repo = new MockRepository
{
GetElevationMapMock = tile =>
{
tileLoadCount[tile] = tileLoadCount[tile] + 1;
return(mapByTile[tile]);
}
};
var cache = new ElevationMapCache(repo, 200);
for (int j = 0; j < 3; j++)
{
for (int i = 0; i < 4; i++)
{
var tile = tiles[i];
Check.That(cache.GetValue(tile)).IsEqualTo(mapByTile[tile]);
Thread.Sleep(1);
}
}
Check.That(tileLoadCount[tiles[0]]).IsEqualTo(1);
Check.That(tileLoadCount[tiles[1]]).IsEqualTo(1);
Check.That(tileLoadCount[tiles[2]]).IsEqualTo(1);
Check.That(tileLoadCount[tiles[3]]).IsEqualTo(1);
Check.That(tileLoadCount[tiles[4]]).IsEqualTo(0);
Check.That(cache.GetValue(tiles[4])).IsEqualTo(mapByTile[tiles[4]]);
Check.That(cache.GetValue(tiles[3])).IsEqualTo(mapByTile[tiles[3]]);
Check.That(cache.GetValue(tiles[2])).IsEqualTo(mapByTile[tiles[2]]);
Check.That(cache.GetValue(tiles[1])).IsEqualTo(mapByTile[tiles[1]]);
Check.That(cache.GetValue(tiles[0])).IsEqualTo(mapByTile[tiles[0]]);
Check.That(tileLoadCount[tiles[4]]).IsEqualTo(1);
Check.That(tileLoadCount[tiles[3]]).IsEqualTo(1);
Check.That(tileLoadCount[tiles[2]]).IsEqualTo(1);
Check.That(tileLoadCount[tiles[0]]).IsEqualTo(2);
Check.That(tileLoadCount[tiles[1]]).IsEqualTo(2);
}
