public FileWheel(
IFileSource dfs,
Action <uint, Hash, BlockAddress> onDeletion)
{
_onDeletion = onDeletion ?? throw new ArgumentNullException(nameof(onDeletion));
_fs = dfs ?? throw new ArgumentNullException(nameof(dfs));
_readFiles = new BlockFile[dfs.Count];
// Discover any on-disk files.
foreach (var(i, mmap) in dfs.ScanExistingFiles())
{
if (i >= 2)
{
_readFiles[i] = new BlockFile(mmap, (uint)(i + 1));
}
else
{
mmap.Dispose();
}
}
// The first two files are always reserved for the first two writers.
ReplaceFile(0);
ReplaceFile(1);
_nextAlloc = 2;
}