/// <inheritdoc />
public unsafe void Commit(long beginAddress, long untilAddress, byte[] commitMetadata, long commitNum)
{
using var device = deviceFactory.Get(checkpointNamingScheme.FasterLogCommitMetadata(commitNum));
// Two phase to ensure we write metadata in single Write operation
using var ms = new MemoryStream();
using var writer = new BinaryWriter(ms);
writer.Write(commitMetadata.Length);
writer.Write(commitMetadata);
WriteInto(device, 0, ms.ToArray(), (int)ms.Position);
if (removeOutdated)
{
var prior = flogCommitHistory[flogCommitHistoryOffset];
flogCommitHistory[flogCommitHistoryOffset] = commitNum;
flogCommitHistoryOffset = (byte)((flogCommitHistoryOffset + 1) % flogCommitCount);
if (prior != default)
{
deviceFactory.Delete(checkpointNamingScheme.FasterLogCommitMetadata(prior));
}
}
}
/// <inheritdoc />
public byte[] GetCommitMetadata(long commitNum)
{
IDevice device;
if (overwriteLogCommits)
{
if (singleLogCommitDevice == null)
{
singleLogCommitDevice = deviceFactory.Get(checkpointNamingScheme.FasterLogCommitMetadata(commitNum));
}
device = singleLogCommitDevice;
}
else
{
device = deviceFactory.Get(checkpointNamingScheme.FasterLogCommitMetadata(commitNum));
this.commitNum = commitNum + 1;
}
ReadInto(device, 0, out byte[] writePad, sizeof(int));
int size = BitConverter.ToInt32(writePad, 0);
byte[] body;
if (writePad.Length >= size + sizeof(int))
{
body = writePad;
}
else
{
ReadInto(device, 0, out body, size + sizeof(int));
}
if (!overwriteLogCommits)
{
device.Close();
}
return(new Span <byte>(body).Slice(sizeof(int)).ToArray());
}
