public void TestDeletion()
{
var d1 = GenerateRandomData (1029);
var d2 = GenerateRandomData (14 * 1024 * 4);
var d3 = GenerateRandomData (3591);
var d4 = GenerateRandomData (4444);
var d5 = GenerateRandomData (5555);
var d6 = GenerateRandomData (6666);
using (var ms = new MemoryStream())
{
var recordStorage = new RecordStorage(new BlockStorage(ms));
var r1 = recordStorage.Create (d1);
var r2 = recordStorage.Create (d2);
var r3 = recordStorage.Create (d3);
Assert.AreEqual (1, r1);
Assert.AreEqual (2, r2);
Assert.AreEqual (4, r3);
Assert.True (recordStorage.Find(r1).SequenceEqual(d1));
Assert.True (recordStorage.Find(r2).SequenceEqual(d2));
Assert.True (recordStorage.Find(r3).SequenceEqual(d3));
// Delete off 2, free 2 records
recordStorage.Delete (r2);
Assert.True (recordStorage.Find(r2) == null);
// INsert 2 new records, should take id of 2,3,4
var r4 = recordStorage.Create (d4);
var r5 = recordStorage.Create (d5);
var r6 = recordStorage.Create (d6);
Assert.AreEqual (3, r4);
Assert.AreEqual (2, r5);
Assert.AreEqual (5, r6);
// Check that data is not being corrupted if we use the reusable block
Assert.True (recordStorage.Find(r4).SequenceEqual(d4));
Assert.True (recordStorage.Find(r5).SequenceEqual(d5));
Assert.True (recordStorage.Find(r6).SequenceEqual(d6));
// Test persistance
var recordStorage2 = new RecordStorage(new BlockStorage(ms));
Assert.True (recordStorage2.Find(r1).SequenceEqual(d1));
Assert.True (recordStorage2.Find(r3).SequenceEqual(d3));
Assert.True (recordStorage2.Find(r4).SequenceEqual(d4));
Assert.True (recordStorage2.Find(r5).SequenceEqual(d5));
Assert.True (recordStorage2.Find(r6).SequenceEqual(d6));
}
}
public void TestTrackingOfLargeFreeBlockList ()
{
var tmp = Path.Combine (System.IO.Path.GetTempPath(), "data.bin");
try {
using (var ms = new FileStream(tmp, FileMode.Create))
{
var recordStorage = new RecordStorage(new BlockStorage(ms));
// Create 10,000 records
var ids = new Dictionary<uint, bool>();
for (var i = 0; i < 15342; i++) {
ids.Add (recordStorage.Create (new byte[]{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 }), true);
}
// Now delete them all
foreach (var kv in ids)
{
recordStorage.Delete (kv.Key);
}
// Create records and make sure they reuse these ids,
// And make use it reuses the second block (15343) of free block tracking record as well
var reusedSecondFreeBlockTracker = false;
for (var i = 15342; i >= 0; i--)
{
var id = recordStorage.Create (new byte[]{ 0x00, 0x01, 0x02, 0x03});
if (id == 15343) {
reusedSecondFreeBlockTracker = true;
} else {
Assert.IsTrue (ids.ContainsKey(id));
}
}
Assert.True (reusedSecondFreeBlockTracker);
// Make sure it still continue increment the id..
Assert.AreEqual (15344, recordStorage.Create (new byte[]{ 0x00, 0x01, 0x02, 0x03}));
}
} finally {
if (File.Exists(tmp))
{
File.Delete (tmp);
Console.WriteLine ("Deleted: " + tmp);
}
}
}