private static void VersionCheck(StreamRef stream)
{
var streamVersion = stream.FormatVersion;
if (streamVersion == 0)
{
stream.FormatVersion = CurrentFormatVersion;
}
else if (streamVersion != CurrentFormatVersion)
{
throw new NotImplementedException("Format upgrade not implemented");
}
}
public StreamRange(StreamRef stream, ViewCache.CacheEntry cacheEntry, long offset, uint size)
{
Stream = stream;
CacheEntry = cacheEntry;
View = null;
Offset = offset;
Size = size;
Buffer = cacheEntry.Buffer;
IsDisposed = false;
unchecked {
Pointer = cacheEntry.Pointer + cacheEntry.PointerOffset;
Pointer += (offset - cacheEntry.Offset);
}
}
public StreamRange(StreamRef stream, MemoryMappedViewAccessor view, long offset, uint size, long actualOffset, long actualSize)
{
Stream = stream;
View = view;
CacheEntry = default(ViewCache.CacheEntry);
Offset = offset;
Size = size;
Buffer = view.GetSafeBuffer();
Pointer = null;
Buffer.AcquirePointer(ref Pointer);
IsDisposed = false;
unchecked {
Pointer += view.GetPointerOffset();
Pointer += (offset - actualOffset);
}
}
public BTree(StreamSource storage, string prefix)
{
Storage = storage;
Prefix = prefix;
IndexStream = Storage.Open(prefix + "index");
KeyStream = Storage.Open(prefix + "keys");
DataStream = Storage.Open(prefix + "data");
VersionCheck(IndexStream);
VersionCheck(KeyStream);
VersionCheck(DataStream);
bool needInit = IndexStream.Length < BTreeHeader.Size;
IndexStream.LengthChanging += IndexStream_LengthChanging;
IndexStream.LengthChanged += IndexStream_LengthChanged;
DataStream.LengthChanging += DataStream_LengthChanging;
DataStream.LengthChanged += DataStream_LengthChanged;
_GetKeyOfEntry = ReadKey;
_HeaderRange = IndexStream.AccessRangeUncached(0, BTreeHeader.Size);
if (needInit)
{
InitializeBTree();
}
_FreelistBucketLocks = new object[FreelistIndex.BucketCount];
for (int i = 0; i < _FreelistBucketLocks.Length; i++)
{
_FreelistBucketLocks[i] = new object();
}
EnsureFreelistExists();
}
public StreamRange(StreamRef stream, ViewCache.CacheEntry cacheEntry, long offset, uint size)
{
Stream = stream;
CacheEntry = cacheEntry;
View = null;
Offset = offset;
Size = size;
Buffer = cacheEntry.Buffer;
IsDisposed = false;
unchecked {
Pointer = cacheEntry.Pointer + cacheEntry.PointerOffset;
Pointer += (offset - cacheEntry.Offset);
}
}
public StreamRange(StreamRef stream, MemoryMappedViewAccessor view, long offset, uint size, long actualOffset, long actualSize)
{
Stream = stream;
View = view;
CacheEntry = default(ViewCache.CacheEntry);
Offset = offset;
Size = size;
Buffer = view.GetSafeBuffer();
Pointer = null;
Buffer.AcquirePointer(ref Pointer);
IsDisposed = false;
unchecked {
Pointer += view.GetPointerOffset();
Pointer += (offset - actualOffset);
}
}
