public FilePage(ulong pageId, int pageSize)
{
Id = pageId;
_data = new byte[pageSize];
IsDirty = true;
Deleted = false;
_modified = 1;
_writeOffset = (pageId - 1) * (ulong)pageSize; // TODO : could be a bit shift instead?
_pageSize = pageSize;
}
public FilePage(Stream stream, ulong pageId, int pageSize)
{
_writeOffset = (pageId - 1) * (ulong)pageSize; // TODO : could be a bit shift instead?
stream.Seek((long)_writeOffset, SeekOrigin.Begin);
_data = new byte[pageSize];
stream.Read(Data, 0, pageSize);
IsDirty = false;
Deleted = false;
Id = pageId;
_modified = 0;
_pageSize = pageSize;
}
public BinaryPageAdapter(BinaryFilePageStore store, BinaryFilePage page, ulong currentTransactionId, bool isModified)
{
_store = store;
_page = page;
_isModified = isModified;
if (_page.FirstTransactionId > currentTransactionId && _page.SecondTransactionId > currentTransactionId)
{
// This is an error condition that would happen if a store is kept open while two successive writes are committed
throw new ReadWriteStoreModifiedException();
}
_data = isModified ? _page.GetWriteBuffer(currentTransactionId) : _page.GetReadBuffer(currentTransactionId);
}
public FilePage(ulong pageId, int pageSize)
{
Id = pageId;
_data = new byte[pageSize];
IsDirty = true;
Deleted = false;
_modified = 1;
_writeOffset = (pageId - 1) * (ulong)pageSize; // TODO : could be a bit shift instead?
_pageSize = pageSize;
#if DEBUG_PAGESTORE
Logging.LogDebug("New Page: PageId={0}", Id);
#endif
}
public FilePage(ulong pageId, int pageSize, byte[] data)
{
Id = pageId;
_data = new byte[pageSize];
data.CopyTo(Data, 0);
IsDirty = true;
Deleted = false;
_modified = 1;
_writeOffset = (pageId - 1) * (ulong)pageSize; // TODO : could be a bit shift instead?
_pageSize = pageSize;
#if DEBUG_PAGESTORE
Logging.LogDebug("New Data: PageId={0} Hash={1}", Id, DataHash());
#endif
}
/// <summary>
/// Update the page data
/// </summary>
/// <param name="data">The data buffer to copy from</param>
/// <param name="srcOffset">The offset in <paramref name="data"/> to start copying from </param>
/// <param name="pageOffset">The offset in the page to start copying to</param>
/// <param name="len">The number of bytes to copy</param>
public void SetData(byte[] data, int srcOffset, int pageOffset, int len)
{
lock (_writeLock)
{
if (len < 0)
{
len = data.Length;
}
Array.ConstrainedCopy(data, srcOffset, _data, pageOffset, len);
IsDirty = true;
_modified++;
#if DEBUG_PAGESTORE
Logging.LogDebug("Update {0} {1} {2}", Id, _modified, BitConverter.ToInt32(_data, 0));
#endif
}
}
/// <summary>
/// Update the page data
/// </summary>
/// <param name="data">The data buffer to copy from</param>
/// <param name="srcOffset">The offset in <paramref name="data"/> to start copying from </param>
/// <param name="pageOffset">The offset in the page to start copying to</param>
/// <param name="len">The number of bytes to copy</param>
public void SetData(byte[] data, int srcOffset, int pageOffset, int len)
{
lock (_writeLock)
{
if (len < 0)
{
len = data.Length;
}
Array.ConstrainedCopy(data, srcOffset, _data, pageOffset, len);
IsDirty = true;
_modified++;
#if DEBUG_PAGESTORE
Logging.LogDebug("Update: PageId={0} Hash={1}", Id, DataHash());
#endif
}
}
public FilePage(Stream stream, ulong pageId, int pageSize)
{
_data = new byte[pageSize];
_writeOffset = (pageId - 1) * (ulong)pageSize; // TODO : could be a bit shift instead?
lock (stream)
{
stream.Seek((long)_writeOffset, SeekOrigin.Begin);
stream.Read(Data, 0, pageSize);
}
#if DEBUG_PAGESTORE
Logging.LogDebug("Read: PageId={0} Hash={1}", Id, DataHash());
#endif
IsDirty = false;
Deleted = false;
Id = pageId;
_modified = 0;
_pageSize = pageSize;
}
public void SetData(byte[] data, int srcOffset = 0, int pageOffset = 0, int len = -1)
{
_store.EnsureWriteable(_page.Id);
Array.ConstrainedCopy(data, srcOffset, _data, pageOffset, len < 0 ? data.Length : len);
}
