public void CannotPinMoreNewBlocksThatPoolHave()
{
_poolStrategy = new LRUBufferPoolStrategy(_logManager, _fileManager, 3);
_bufferManager = new BufferManager(_fileManager, _logManager, _poolStrategy, TimeSpan.FromMilliseconds(500), TimeSpan.FromMilliseconds(100));
var filename = RandomFilename;
var pageFormatter = new BasePageFormatter();
var buffer1 = _bufferManager.PinNew(filename, pageFormatter);
var buffer2 = _bufferManager.PinNew(filename, pageFormatter);
var buffer3 = _bufferManager.PinNew(filename, pageFormatter);
Assert.IsTrue(buffer1.IsPinned);
Assert.IsTrue(buffer2.IsPinned);
Assert.IsTrue(buffer3.IsPinned);
Assert.AreEqual(filename, buffer1.Block.Filename);
Assert.AreEqual(0, buffer1.Block.Id);
Assert.AreEqual(filename, buffer2.Block.Filename);
Assert.AreEqual(1, buffer2.Block.Id);
Assert.AreEqual(filename, buffer3.Block.Filename);
Assert.AreEqual(2, buffer3.Block.Id);
Assert.Throws <BufferBusyException>(() =>
{
var buffer4 = _bufferManager.PinNew(filename, pageFormatter);
});
Assert.AreEqual(0, _bufferManager.Available);
}
public void CanUnpinBuffer()
{
_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);
var buffer2 = _bufferManager.PinNew(filename, pageFormatter);
Assert.IsTrue(buffer1.IsPinned);
Assert.IsTrue(buffer2.IsPinned);
Assert.AreEqual(filename, buffer1.Block.Filename);
Assert.AreEqual(0, buffer1.Block.Id);
Assert.AreEqual(filename, buffer2.Block.Filename);
Assert.AreEqual(1, buffer2.Block.Id);
Assert.AreEqual(1, _bufferManager.Available);
_bufferManager.Unpin(buffer1);
Assert.IsFalse(buffer1.IsPinned);
Assert.AreEqual(2, _bufferManager.Available);
_bufferManager.Unpin(buffer2);
Assert.IsFalse(buffer2.IsPinned);
Assert.AreEqual(3, _bufferManager.Available);
}
public Block PinNew(string filename, IPageFormatter pageFormatter)
{
var buffer = _bufferManager.PinNew(filename, pageFormatter);
var block = buffer.Block;
_buffers.TryAdd(block, buffer);
_pins.Add(block);
return(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);
}