/// <summary>
/// Read pages from specified device
/// </summary>
/// <typeparam name="TContext"></typeparam>
/// <param name="readPageStart"></param>
/// <param name="numPages"></param>
/// <param name="untilAddress"></param>
/// <param name="callback"></param>
/// <param name="context"></param>
/// <param name="frame"></param>
/// <param name="completed"></param>
/// <param name="devicePageOffset"></param>
/// <param name="device"></param>
/// <param name="objectLogDevice"></param>
internal void AsyncReadPagesFromDeviceToFrame <TContext>(
long readPageStart,
int numPages,
long untilAddress,
IOCompletionCallback callback,
TContext context,
BlittableFrame frame,
out CountdownEvent completed,
long devicePageOffset = 0,
IDevice device = null, IDevice objectLogDevice = null)
{
var usedDevice = device;
IDevice usedObjlogDevice = objectLogDevice;
if (device == null)
{
usedDevice = this.device;
}
completed = new CountdownEvent(numPages);
for (long readPage = readPageStart; readPage < (readPageStart + numPages); readPage++)
{
int pageIndex = (int)(readPage % frame.frameSize);
if (frame.frame[pageIndex] == null)
{
frame.Allocate(pageIndex);
}
else
{
frame.Clear(pageIndex);
}
var asyncResult = new PageAsyncReadResult <TContext>()
{
page = readPage,
context = context,
handle = completed,
frame = frame
};
ulong offsetInFile = (ulong)(AlignedPageSizeBytes * readPage);
uint readLength = (uint)AlignedPageSizeBytes;
long adjustedUntilAddress = (AlignedPageSizeBytes * (untilAddress >> LogPageSizeBits) + (untilAddress & PageSizeMask));
if (adjustedUntilAddress > 0 && ((adjustedUntilAddress - (long)offsetInFile) < PageSize))
{
readLength = (uint)(adjustedUntilAddress - (long)offsetInFile);
readLength = (uint)((readLength + (sectorSize - 1)) & ~(sectorSize - 1));
}
if (device != null)
{
offsetInFile = (ulong)(AlignedPageSizeBytes * (readPage - devicePageOffset));
}
usedDevice.ReadAsync(offsetInFile, (IntPtr)frame.pointers[pageIndex], readLength, callback, asyncResult);
}
}
/// <summary>
/// Read pages from specified device
/// </summary>
/// <typeparam name="TContext"></typeparam>
/// <param name="readPageStart"></param>
/// <param name="numPages"></param>
/// <param name="callback"></param>
/// <param name="context"></param>
/// <param name="frame"></param>
/// <param name="completed"></param>
/// <param name="devicePageOffset"></param>
/// <param name="device"></param>
/// <param name="objectLogDevice"></param>
internal void AsyncReadPagesFromDeviceToFrame <TContext>(
long readPageStart,
int numPages,
IOCompletionCallback callback,
TContext context,
BlittableFrame frame,
out CountdownEvent completed,
long devicePageOffset = 0,
IDevice device = null, IDevice objectLogDevice = null)
{
var usedDevice = device;
IDevice usedObjlogDevice = objectLogDevice;
if (device == null)
{
usedDevice = this.device;
}
completed = new CountdownEvent(numPages);
for (long readPage = readPageStart; readPage < (readPageStart + numPages); readPage++)
{
int pageIndex = (int)(readPage % frame.frameSize);
if (frame.frame[pageIndex] == null)
{
frame.Allocate(pageIndex);
}
else
{
frame.Clear(pageIndex);
}
var asyncResult = new PageAsyncReadResult <TContext>()
{
page = readPage,
context = context,
handle = completed,
count = 1,
frame = frame
};
ulong offsetInFile = (ulong)(AlignedPageSizeBytes * readPage);
if (device != null)
{
offsetInFile = (ulong)(AlignedPageSizeBytes * (readPage - devicePageOffset));
}
usedDevice.ReadAsync(offsetInFile, (IntPtr)frame.pointers[pageIndex], (uint)AlignedPageSizeBytes, callback, asyncResult);
}
}
internal override void AsyncReadPagesFromDeviceToFrame <TContext>(long readPageStart, int numPages, long untilAddress, TContext context, out CountdownEvent completed, long devicePageOffset = 0, IDevice device = null, IDevice objectLogDevice = null, CancellationTokenSource cts = null)
{
IDevice usedDevice = deltaLogDevice;
completed = new CountdownEvent(numPages);
for (long readPage = readPageStart; readPage < (readPageStart + numPages); readPage++)
{
int pageIndex = (int)(readPage % frame.frameSize);
if (frame.frame[pageIndex] == null)
{
frame.Allocate(pageIndex);
}
else
{
frame.Clear(pageIndex);
}
var asyncResult = new PageAsyncReadResult <TContext>()
{
page = readPage,
context = context,
handle = completed,
frame = frame
};
ulong offsetInFile = (ulong)(AlignedPageSizeBytes * readPage);
uint readLength = (uint)AlignedPageSizeBytes;
long adjustedUntilAddress = (AlignedPageSizeBytes * (untilAddress >> LogPageSizeBits) + (untilAddress & PageSizeMask));
if (adjustedUntilAddress > 0 && ((adjustedUntilAddress - (long)offsetInFile) < PageSize))
{
readLength = (uint)(adjustedUntilAddress - (long)offsetInFile);
readLength = (uint)(Align(readLength));
}
if (device != null)
{
offsetInFile = (ulong)(AlignedPageSizeBytes * (readPage - devicePageOffset));
}
usedDevice.ReadAsync(offsetInFile, (IntPtr)frame.pointers[pageIndex], readLength, AsyncReadPagesCallback, asyncResult);
}
}