public Buffer PinNew(string filename, IPageFormatter pageFormatter)
{
//try
//{
long timestamp = DateTime.UtcNow.Ticks;
Buffer buffer = null;
lock (_bufferGatheringLock)
{
buffer = _poolStrategy.PinNew(filename, pageFormatter);
}
while (buffer == null && !WaitingForTooLong(timestamp))
{
Thread.Sleep(_tickWaitingTime);
lock (_bufferGatheringLock)
{
buffer = _poolStrategy.PinNew(filename, pageFormatter);
}
}
if (buffer == null)
{
throw new BufferBusyException();
}
return(buffer);
//}
//catch (ThreadAbortException)
//{
// throw new BufferBusyException();
//}
}
public void CanUnpinBuffer()
{
_poolStrategy = new LRUBufferPoolStrategy(_logManager, _fileManager, 3);
var filename = RandomFilename;
var pageFormatter = new BasePageFormatter();
var buffer1 = _poolStrategy.PinNew(filename, pageFormatter);
var buffer2 = _poolStrategy.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, _poolStrategy.Available);
_poolStrategy.Unpin(buffer1);
Assert.IsFalse(buffer1.IsPinned);
Assert.AreEqual(2, _poolStrategy.Available);
_poolStrategy.Unpin(buffer2);
Assert.IsFalse(buffer2.IsPinned);
Assert.AreEqual(3, _poolStrategy.Available);
}
public void CanPinBufferMultipleTimesAndUnpinMultipleTimes()
{
_poolStrategy = new NaiveBufferPoolStrategy(_logManager, _fileManager, 3);
var filename = RandomFilename;
var pageFormatter = new BasePageFormatter();
var buffer1 = _poolStrategy.PinNew(filename, pageFormatter);
Assert.IsTrue(buffer1.IsPinned);
Assert.AreEqual(2, _poolStrategy.Available);
var buffer2 = _poolStrategy.Pin(buffer1.Block);
Assert.IsTrue(buffer2.IsPinned);
Assert.AreEqual(2, _poolStrategy.Available);
_poolStrategy.Unpin(buffer1);
Assert.IsTrue(buffer1.IsPinned);
Assert.AreEqual(2, _poolStrategy.Available);
_poolStrategy.Unpin(buffer2);
Assert.IsFalse(buffer2.IsPinned);
Assert.AreEqual(3, _poolStrategy.Available);
}
public void CannotPinMoreNewBlocksThatPoolHave()
{
_poolStrategy = new LRUBufferPoolStrategy(_logManager, _fileManager, 3);
var filename = RandomFilename;
var pageFormatter = new BasePageFormatter();
var buffer1 = _poolStrategy.PinNew(filename, pageFormatter);
var buffer2 = _poolStrategy.PinNew(filename, pageFormatter);
var buffer3 = _poolStrategy.PinNew(filename, pageFormatter);
var buffer4 = _poolStrategy.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.IsNull(buffer4);
Assert.AreEqual(0, _poolStrategy.Available);
}
public void CanPinBufferWriteAndFlush()
{
_poolStrategy = new LRUBufferPoolStrategy(_logManager, _fileManager, 3);
var filename = RandomFilename;
var pageFormatter = new BasePageFormatter();
var buffer1 = _poolStrategy.PinNew(filename, pageFormatter);
buffer1.SetInt(0, 123, 1, 1);
_poolStrategy.FlushAll(1);
_poolStrategy.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);
}