/// <summary>
/// Writes data to the specified page
/// </summary>
/// <param name="commitId">The transaction id for the update</param>
/// <param name="pageId">The ID of the page to write to</param>
/// <param name="buff">The data to be written</param>
/// <param name="srcOffset">The offset into <paramref name="buff"/> from which to start copying bytes. Defaults to 0</param>
/// <param name="pageOffset">The offset into the page data buffer to start writing to. Defaults to 0</param>
/// <param name="len">The number of bytes to write. Defaults to all bytes in <paramref name="buff"/> from the specified <paramref name="srcOffset"/></param>
/// <param name="profiler"></param>
public void Write(ulong commitId, ulong pageId, byte[] buff, int srcOffset = 0, int pageOffset = 0, int len = -1, BrightstarProfiler profiler = null)
{
using (profiler.Step("Write Page"))
{
var page = GetPage(pageId, profiler);
var writeBuff = page.GetWriteBuffer(commitId);
Array.Copy(buff, srcOffset, writeBuff, pageOffset, len < 0 ? buff.Length : len);
_modifiedPages[pageId] = new Tuple <BinaryFilePage, ulong>(page, commitId);
}
}
/// <summary>
/// Returns a writeable copy of the specified page
/// </summary>
/// <param name="commitId">The transaction id for the write operation</param>
/// <param name="page">The page to return a writeable version of</param>
/// <returns></returns>
public IPage GetWriteablePage(ulong commitId, IPage page)
{
Tuple <BinaryFilePage, ulong> bfpTuple;
if (!_modifiedPages.TryGetValue(page.Id, out bfpTuple))
{
#if DEBUG_BTREE
Logging.LogDebug("Initialized Write Buffer for page@{0} in commit {1}", page.Id, commitId);
#endif
var bfp = GetPage(page.Id, null);
Array.ConstrainedCopy(bfp.GetReadBuffer(CurrentTransactionId), 0,
bfp.GetWriteBuffer(commitId), 0,
PageSize);
bfpTuple = new Tuple <BinaryFilePage, ulong>(bfp, commitId);
_modifiedPages[bfp.Id] = bfpTuple;
}
return(new BinaryPageAdapter(this, bfpTuple.Item1, commitId, true));
}
private void Load(Stream inputStream)
{
var header = new byte[HeaderSize];
inputStream.Read(header, 0, HeaderSize);
uint magicNumber = BitConverter.ToUInt32(header, 0);
if (magicNumber != MagicNumber)
{
throw new Exception("Invalid master file. Magic number does not match expected value");
}
StoreType = (StoreType)header[4];
PersistenceType = (PersistenceType)header[5];
StoreFormatVersion = BitConverter.ToInt32(header, 6);
var guidBytes = new byte[16];
Array.Copy(header, 10, guidBytes, 0, 16);
StoreSetId = new Guid(guidBytes);
Array.Copy(header, 26, guidBytes, 0, 16);
StoreId = new Guid(guidBytes);
}
// TODO: Modify the interface so that we don't have to implement this stub
public void Write(ulong commitId, ulong pageId, byte[] buff, int srcOffset = 0, int pageOffset = 0, int len = -1,
BrightstarProfiler profiler = null)
{
// This method is only used by the ResourceTable, which is always an append-only store.
throw new NotImplementedException();
}
