internal BlockCacheSettings(BlockCacheSettings settings)
{
BlockSize = settings.BlockSize;
ReadCacheSize = settings.ReadCacheSize;
LargeReadSize = settings.LargeReadSize;
OptimumReadSize = settings.OptimumReadSize;
}
/// <summary>
/// Initializes a new instance of the BlockCacheStream class.
/// </summary>
/// <param name="toWrap">The stream to wrap.</param>
/// <param name="ownership">Whether to assume ownership of <c>toWrap</c>.</param>
/// <param name="settings">The cache settings.</param>
public BlockCacheStream(SparseStream toWrap, Ownership ownership, BlockCacheSettings settings)
{
if (!toWrap.CanRead)
{
throw new ArgumentException("The wrapped stream does not support reading", nameof(toWrap));
}
if (!toWrap.CanSeek)
{
throw new ArgumentException("The wrapped stream does not support seeking", nameof(toWrap));
}
_wrappedStream = toWrap;
_ownWrapped = ownership;
_settings = new BlockCacheSettings(settings);
if (_settings.OptimumReadSize % _settings.BlockSize != 0)
{
throw new ArgumentException("Invalid settings, OptimumReadSize must be a multiple of BlockSize",
nameof(settings));
}
_readBuffer = new byte[_settings.OptimumReadSize];
_blocksInReadBuffer = _settings.OptimumReadSize / _settings.BlockSize;
int totalBlocks = (int)(_settings.ReadCacheSize / _settings.BlockSize);
_cache = new BlockCache <Block>(_settings.BlockSize, totalBlocks);
_stats = new BlockCacheStatistics();
_stats.FreeReadBlocks = totalBlocks;
}
/// <summary>
/// Initializes a new instance of the BlockCacheStream class.
/// </summary>
/// <param name="toWrap">The stream to wrap.</param>
/// <param name="ownership">Whether to assume ownership of <c>toWrap</c>.</param>
/// <param name="settings">The cache settings.</param>
public BlockCacheStream(SparseStream toWrap, Ownership ownership, BlockCacheSettings settings)
{
if (!toWrap.CanRead)
{
throw new ArgumentException("The wrapped stream does not support reading", "toWrap");
}
if (!toWrap.CanSeek)
{
throw new ArgumentException("The wrapped stream does not support seeking", "toWrap");
}
_wrappedStream = toWrap;
_ownWrapped = ownership;
_settings = new BlockCacheSettings(settings);
if (_settings.OptimumReadSize % _settings.BlockSize != 0)
{
throw new ArgumentException("Invalid settings, OptimumReadSize must be a multiple of BlockSize", "settings");
}
_readBuffer = new byte[_settings.OptimumReadSize];
_blocksInReadBuffer = _settings.OptimumReadSize / _settings.BlockSize;
int totalBlocks = (int)(_settings.ReadCacheSize / _settings.BlockSize);
_cache = new BlockCache<Block>(_settings.BlockSize, totalBlocks);
_stats = new BlockCacheStatistics();
_stats.FreeReadBlocks = totalBlocks;
}
public void CachedOverread()
{
MemoryStream ms = CreateSequencedMemStream(100, false);
BlockCacheSettings settings = new BlockCacheSettings() { BlockSize = 10, OptimumReadSize = 20, ReadCacheSize = 100, LargeReadSize = 30 };
BlockCacheStream cacheStream = new BlockCacheStream(SparseStream.FromStream(ms, Ownership.Dispose), Ownership.Dispose, settings);
byte[] buffer = new byte[20];
cacheStream.Position = 90;
int numRead = cacheStream.Read(buffer, 0, buffer.Length);
Assert.AreEqual(10, numRead);
AssertSequenced(buffer, 0, 10, 90);
Assert.AreEqual(0, cacheStream.Statistics.LargeReadsIn);
Assert.AreEqual(0, cacheStream.Statistics.ReadCacheHits);
Assert.AreEqual(1, cacheStream.Statistics.TotalReadsIn);
buffer = new byte[buffer.Length];
cacheStream.Position = 90;
numRead = cacheStream.Read(buffer, 0, buffer.Length);
Assert.AreEqual(10, numRead);
AssertSequenced(buffer, 0, 10, 90);
Assert.AreEqual(0, cacheStream.Statistics.LargeReadsIn);
Assert.AreEqual(1, cacheStream.Statistics.ReadCacheHits);
Assert.AreEqual(2, cacheStream.Statistics.TotalReadsIn);
}
/// <summary>
/// Creates a new instance.
/// </summary>
/// <param name="toWrap">The stream to wrap</param>
/// <param name="ownership">Whether to assume ownership of <c>toWrap</c></param>
/// <param name="settings">The cache settings</param>
public BlockCacheStream(SparseStream toWrap, Ownership ownership, BlockCacheSettings settings)
{
if (!toWrap.CanRead)
{
throw new ArgumentException("The wrapped stream does not support reading", "toWrap");
}
if (!toWrap.CanSeek)
{
throw new ArgumentException("The wrapped stream does not support seeking", "toWrap");
}
_wrappedStream = toWrap;
_ownWrapped = ownership;
_settings = new BlockCacheSettings(settings);
if (_settings.OptimumReadSize % _settings.BlockSize != 0)
{
throw new ArgumentException("Invalid settings, OptimumReadSize must be a multiple of BlockSize", "settings");
}
_readBuffer = new byte[_settings.OptimumReadSize];
_blocksInReadBuffer = _settings.OptimumReadSize / _settings.BlockSize;
_totalBlocks = (int)(_settings.ReadCacheSize / _settings.BlockSize);
_stats = new BlockCacheStatistics();
_stats.FreeReadBlocks = _totalBlocks;
_blocks = new Dictionary <long, CacheBlock>();
_lru = new LinkedList <CacheBlock>();
_freeBlocks = new List <CacheBlock>(_totalBlocks);
}
public void FailWrite()
{
MemoryStream ms = CreateSequencedMemStream(100, false);
BlockCacheSettings settings = new BlockCacheSettings()
{
BlockSize = 10, OptimumReadSize = 20, ReadCacheSize = 100, LargeReadSize = 30
};
BlockCacheStream cacheStream = new BlockCacheStream(SparseStream.FromStream(ms, Ownership.Dispose), Ownership.Dispose, settings);
byte[] buffer = new byte[25];
cacheStream.Position = 0;
cacheStream.Read(buffer, 0, buffer.Length);
AssertSequenced(buffer, 0);
int freeBefore = cacheStream.Statistics.FreeReadBlocks;
cacheStream.Position = 11;
try
{
cacheStream.Write(new byte[10], 0, 10);
}
catch (NotSupportedException)
{
Assert.AreEqual(freeBefore + 2, cacheStream.Statistics.FreeReadBlocks);
}
}
public void Write()
{
MemoryStream ms = CreateSequencedMemStream(100, true);
BlockCacheSettings settings = new BlockCacheSettings()
{
BlockSize = 10, OptimumReadSize = 20, ReadCacheSize = 100, LargeReadSize = 30
};
BlockCacheStream cacheStream = new BlockCacheStream(SparseStream.FromStream(ms, Ownership.Dispose), Ownership.Dispose, settings);
byte[] buffer = new byte[20];
cacheStream.Position = 10;
cacheStream.Read(buffer, 0, buffer.Length);
AssertSequenced(buffer, 10);
cacheStream.Position = 20;
cacheStream.Write(new byte[10], 0, 10);
Assert.AreEqual(30, cacheStream.Position);
cacheStream.Position = 10;
buffer = new byte[30];
cacheStream.Read(buffer, 0, buffer.Length);
AssertSequenced(buffer, 0, 10, 10);
AssertSequenced(buffer, 20, 10, 30);
Assert.AreEqual(0, buffer[10]);
Assert.AreEqual(0, buffer[19]);
}
public void CacheBlockRecycle()
{
MemoryStream ms = CreateSequencedMemStream(100, false);
BlockCacheSettings settings = new BlockCacheSettings()
{
BlockSize = 10, OptimumReadSize = 20, ReadCacheSize = 50, LargeReadSize = 100
};
BlockCacheStream cacheStream = new BlockCacheStream(SparseStream.FromStream(ms, Ownership.Dispose), Ownership.Dispose, settings);
byte[] buffer = new byte[50];
cacheStream.Position = 10;
int numRead = cacheStream.Read(buffer, 0, buffer.Length);
Assert.AreEqual(50, numRead);
AssertSequenced(buffer, 10);
Assert.AreEqual(0, cacheStream.Statistics.LargeReadsIn);
Assert.AreEqual(0, cacheStream.Statistics.ReadCacheHits);
Assert.AreEqual(1, cacheStream.Statistics.TotalReadsIn);
buffer = new byte[40];
cacheStream.Position = 50;
numRead = cacheStream.Read(buffer, 0, buffer.Length);
Assert.AreEqual(40, numRead);
AssertSequenced(buffer, 50);
Assert.AreEqual(0, cacheStream.Statistics.LargeReadsIn);
Assert.AreEqual(1, cacheStream.Statistics.ReadCacheHits);
Assert.AreEqual(2, cacheStream.Statistics.TotalReadsIn);
}
public void UnalignedCachedRead()
{
MemoryStream ms = CreateSequencedMemStream(100, false);
BlockCacheSettings settings = new BlockCacheSettings()
{
BlockSize = 10, OptimumReadSize = 20, ReadCacheSize = 100, LargeReadSize = 30
};
BlockCacheStream cacheStream = new BlockCacheStream(SparseStream.FromStream(ms, Ownership.Dispose), Ownership.Dispose, settings);
byte[] buffer = new byte[20];
cacheStream.Position = 3;
cacheStream.Read(buffer, 0, buffer.Length);
AssertSequenced(buffer, 3);
Assert.AreEqual(0, cacheStream.Statistics.LargeReadsIn);
Assert.AreEqual(0, cacheStream.Statistics.ReadCacheHits);
Assert.AreEqual(1, cacheStream.Statistics.TotalReadsIn);
buffer = new byte[buffer.Length];
cacheStream.Position = 3;
cacheStream.Read(buffer, 0, buffer.Length);
AssertSequenced(buffer, 3);
Assert.AreEqual(0, cacheStream.Statistics.LargeReadsIn);
Assert.AreEqual(1, cacheStream.Statistics.ReadCacheHits);
Assert.AreEqual(2, cacheStream.Statistics.TotalReadsIn);
}
public void Bug5203_IncreaseSize()
{
MemoryStream ms = new MemoryStream();
BlockCacheSettings settings = new BlockCacheSettings { BlockSize = 64, LargeReadSize = 128, OptimumReadSize = 64, ReadCacheSize = 1024 };
BlockCacheStream bcs = new BlockCacheStream(SparseStream.FromStream(ms, Ownership.Dispose), Ownership.Dispose, settings);
// Pre-load read cache with a 'short' block
bcs.Write(new byte[11], 0, 11);
bcs.Position = 0;
bcs.Read(new byte[11], 0, 11);
// Extend stream
for(int i = 0; i < 20; ++i)
{
bcs.Write(new byte[11], 0, 11);
}
// Try to read from first block beyond length of original cached short length
// Bug was throwing exception here
bcs.Position = 60;
bcs.Read(new byte[20], 0, 20);
}
public void Bug5203_IncreaseSize()
{
MemoryStream ms = new MemoryStream();
BlockCacheSettings settings = new BlockCacheSettings {
BlockSize = 64, LargeReadSize = 128, OptimumReadSize = 64, ReadCacheSize = 1024
};
BlockCacheStream bcs = new BlockCacheStream(SparseStream.FromStream(ms, Ownership.Dispose), Ownership.Dispose, settings);
// Pre-load read cache with a 'short' block
bcs.Write(new byte[11], 0, 11);
bcs.Position = 0;
bcs.Read(new byte[11], 0, 11);
// Extend stream
for (int i = 0; i < 20; ++i)
{
bcs.Write(new byte[11], 0, 11);
}
// Try to read from first block beyond length of original cached short length
// Bug was throwing exception here
bcs.Position = 60;
bcs.Read(new byte[20], 0, 20);
}
public void Write()
{
MemoryStream ms = CreateSequencedMemStream(100, true);
BlockCacheSettings settings = new BlockCacheSettings() { BlockSize = 10, OptimumReadSize = 20, ReadCacheSize = 100, LargeReadSize = 30 };
BlockCacheStream cacheStream = new BlockCacheStream(SparseStream.FromStream(ms, Ownership.Dispose), Ownership.Dispose, settings);
byte[] buffer = new byte[20];
cacheStream.Position = 10;
cacheStream.Read(buffer, 0, buffer.Length);
AssertSequenced(buffer, 10);
cacheStream.Position = 20;
cacheStream.Write(new byte[10], 0, 10);
Assert.AreEqual(30, cacheStream.Position);
cacheStream.Position = 10;
buffer = new byte[30];
cacheStream.Read(buffer, 0, buffer.Length);
AssertSequenced(buffer, 0, 10, 10);
AssertSequenced(buffer, 20, 10, 30);
Assert.AreEqual(0, buffer[10]);
Assert.AreEqual(0, buffer[19]);
}
public void FailWrite()
{
MemoryStream ms = CreateSequencedMemStream(100, false);
BlockCacheSettings settings = new BlockCacheSettings() { BlockSize = 10, OptimumReadSize = 20, ReadCacheSize = 100, LargeReadSize = 30 };
BlockCacheStream cacheStream = new BlockCacheStream(SparseStream.FromStream(ms, Ownership.Dispose), Ownership.Dispose, settings);
byte[] buffer = new byte[25];
cacheStream.Position = 0;
cacheStream.Read(buffer, 0, buffer.Length);
AssertSequenced(buffer, 0);
int freeBefore = cacheStream.Statistics.FreeReadBlocks;
cacheStream.Position = 11;
try
{
cacheStream.Write(new byte[10], 0, 10);
}
catch(NotSupportedException)
{
Assert.AreEqual(freeBefore + 2, cacheStream.Statistics.FreeReadBlocks);
}
}
