public void CanPinBufferMultipleTimesAndUnpinMultipleTimes()
{
_poolStrategy = new LRUBufferPoolStrategy(_logManager, _fileManager, 3);
_bufferManager = new BufferManager(_fileManager, _logManager, _poolStrategy, null, null);
var filename = RandomFilename;
var pageFormatter = new BasePageFormatter();
var buffer1 = _bufferManager.PinNew(filename, pageFormatter);
Assert.IsTrue(buffer1.IsPinned);
Assert.AreEqual(2, _bufferManager.Available);
var buffer2 = _bufferManager.Pin(buffer1.Block);
Assert.IsTrue(buffer2.IsPinned);
Assert.AreEqual(2, _bufferManager.Available);
_bufferManager.Unpin(buffer1);
Assert.IsTrue(buffer1.IsPinned);
Assert.AreEqual(2, _bufferManager.Available);
_bufferManager.Unpin(buffer2);
Assert.IsFalse(buffer2.IsPinned);
Assert.AreEqual(3, _bufferManager.Available);
}
public void Unpin(Block block)
{
if (_buffers.TryGetValue(block, out var buffer))
{
_bufferManager.Unpin(buffer);
_pins.Remove(block);
// Don't think that would need this check.
// Anyway, let it be for now, code coverage would show who is right
if (!_pins.Contains(block))
{
_buffers.Remove(block);
}
}
}
public void CanPinBufferWriteAndFlush()
{
_poolStrategy = new LRUBufferPoolStrategy(_logManager, _fileManager, 3);
_bufferManager = new BufferManager(_fileManager, _logManager, _poolStrategy, null, null);
var filename = RandomFilename;
var pageFormatter = new BasePageFormatter();
var buffer1 = _bufferManager.PinNew(filename, pageFormatter);
buffer1.SetInt(0, 123, 1, 1);
_bufferManager.FlushAll(1);
_bufferManager.Unpin(buffer1);
var page = _fileManager.ResolvePage();
var canRead = page.Read(new Block(filename, 0));
var canGetValue = page.GetInt(0, out var value);
Assert.IsFalse(buffer1.IsPinned);
Assert.IsTrue(canRead);
Assert.IsTrue(canGetValue);
Assert.AreEqual(123, value);
}
public void CanRecover()
{
_recoveryManager = new RecoveryManager(_bufferManager, _logManager, 6);
var block = new Block(RandomFilename, 0);
var buffer = _bufferManager.Pin(block);
_recoveryManager.Recover();
_bufferManager.Unpin(buffer);
_bufferManager.FlushAll(6);
var page = _fileManager.ResolvePage();
_ = page.Read(new Block(_name, 0));
var enumerator = _logManager.GetEnumerator();
var record = enumerator.Current;
var checkpointRecord = new CheckpointRecord(_logManager, _bufferManager, record);
Assert.AreEqual(LogRecordType.Checkpoint, checkpointRecord.Type);
Assert.AreEqual(1, checkpointRecord.Transactions.Length);
Assert.AreEqual(6, checkpointRecord.Transactions[0]);
}