/// <summary>
/// Get next record using iterator
/// </summary>
/// <param name="recordInfo"></param>
/// <param name="key"></param>
/// <param name="value"></param>
/// <returns></returns>
public bool GetNext(out RecordInfo recordInfo, out Key key, out Value value)
{
recordInfo = default(RecordInfo);
key = default(Key);
value = default(Value);
currentAddress = nextAddress;
while (true)
{
// Check for boundary conditions
if (currentAddress >= endAddress)
{
return(false);
}
if (currentAddress < hlog.BeginAddress)
{
throw new Exception("Iterator address is less than log BeginAddress " + hlog.BeginAddress);
}
var currentPage = currentAddress >> hlog.LogPageSizeBits;
var currentFrame = currentPage % frameSize;
var offset = (currentAddress & hlog.PageSizeMask) / recordSize;
if (currentAddress < hlog.HeadAddress)
{
BufferAndLoad(currentAddress, currentPage, currentFrame);
}
// Check if record fits on page, if not skip to next page
if ((currentAddress & hlog.PageSizeMask) + recordSize > hlog.PageSize)
{
currentAddress = (1 + (currentAddress >> hlog.LogPageSizeBits)) << hlog.LogPageSizeBits;
continue;
}
if (currentAddress >= hlog.HeadAddress)
{
// Read record from cached page memory
nextAddress = currentAddress + recordSize;
var page = currentPage % hlog.BufferSize;
if (hlog.values[page][offset].info.Invalid)
{
continue;
}
recordInfo = hlog.values[page][offset].info;
key = hlog.values[page][offset].key;
value = hlog.values[page][offset].value;
return(true);
}
nextAddress = currentAddress + recordSize;
if (frame.GetInfo(currentFrame, offset).Invalid)
{
continue;
}
recordInfo = frame.GetInfo(currentFrame, offset);
key = frame.GetKey(currentFrame, offset);
value = frame.GetValue(currentFrame, offset);
return(true);
}
}
/// <summary>
/// Get next record in iterator
/// </summary>
/// <param name="recordInfo"></param>
/// <returns></returns>
public bool GetNext(out RecordInfo recordInfo)
{
recordInfo = default;
currentKey = default;
currentValue = default;
while (true)
{
currentAddress = nextAddress;
// Check for boundary conditions
if (currentAddress >= endAddress)
{
return(false);
}
epoch?.Resume();
var headAddress = hlog.HeadAddress;
if (currentAddress < hlog.BeginAddress)
{
epoch?.Suspend();
throw new FasterException("Iterator address is less than log BeginAddress " + hlog.BeginAddress);
}
if (frameSize == 0 && currentAddress < headAddress)
{
epoch?.Suspend();
throw new FasterException("Iterator address is less than log HeadAddress in memory-scan mode");
}
var currentPage = currentAddress >> hlog.LogPageSizeBits;
var offset = (currentAddress & hlog.PageSizeMask) / recordSize;
if (currentAddress < headAddress)
{
BufferAndLoad(currentAddress, currentPage, currentPage % frameSize, headAddress, endAddress);
}
// Check if record fits on page, if not skip to next page
if ((currentAddress & hlog.PageSizeMask) + recordSize > hlog.PageSize)
{
nextAddress = (1 + (currentAddress >> hlog.LogPageSizeBits)) << hlog.LogPageSizeBits;
epoch?.Suspend();
continue;
}
nextAddress = currentAddress + recordSize;
if (currentAddress >= headAddress)
{
// Read record from cached page memory
var page = currentPage % hlog.BufferSize;
if (hlog.values[page][offset].info.SkipOnScan)
{
epoch?.Suspend();
continue;
}
recordInfo = hlog.values[page][offset].info;
currentKey = hlog.values[page][offset].key;
currentValue = hlog.values[page][offset].value;
epoch?.Suspend();
return(true);
}
var currentFrame = currentPage % frameSize;
if (frame.GetInfo(currentFrame, offset).SkipOnScan)
{
epoch?.Suspend();
continue;
}
recordInfo = frame.GetInfo(currentFrame, offset);
currentKey = frame.GetKey(currentFrame, offset);
currentValue = frame.GetValue(currentFrame, offset);
epoch?.Suspend();
return(true);
}
}
