private LockAttemptResult RunBattle([NotNull] LockMetadata lockMetadata, [NotNull] string threadId, long newThreshold)
{
var items = baseOperationsPerformer.SearchThreads(lockMetadata.MainRowKey(), lockMetadata.PreviousThreshold);
if (items.Length == 1)
{
return(items[0] == threadId?LockAttemptResult.Success() : LockAttemptResult.AnotherOwner(items[0]));
}
if (items.Length > 1)
{
if (items.Any(s => s == threadId))
{
throw new Exception("Lock unknown exception");
}
return(LockAttemptResult.AnotherOwner(items[0]));
}
var beforeOurWriteShades = baseOperationsPerformer.SearchThreads(lockMetadata.ShadowRowKey(), lockMetadata.PreviousThreshold);
if (beforeOurWriteShades.Length > 0)
{
return(LockAttemptResult.ConcurrentAttempt());
}
baseOperationsPerformer.WriteThread(lockMetadata.ShadowRowKey(), newThreshold, threadId, LockTtl);
var shades = baseOperationsPerformer.SearchThreads(lockMetadata.ShadowRowKey(), lockMetadata.PreviousThreshold);
if (shades.Length == 1)
{
items = baseOperationsPerformer.SearchThreads(lockMetadata.MainRowKey(), lockMetadata.PreviousThreshold);
if (items.Length == 0)
{
baseOperationsPerformer.WriteThread(lockMetadata.MainRowKey(), newThreshold, threadId, LockTtl);
baseOperationsPerformer.DeleteThread(lockMetadata.ShadowRowKey(), newThreshold, threadId);
return(LockAttemptResult.Success());
}
}
baseOperationsPerformer.DeleteThread(lockMetadata.ShadowRowKey(), newThreshold, threadId);
return(LockAttemptResult.ConcurrentAttempt());
}
public static string MainRowKey([NotNull] this LockMetadata lockMetadata)
{
return("Main_" + lockMetadata.LockRowId);
}
public static string ShadowRowKey([NotNull] this LockMetadata lockMetadata)
{
return("Shade_" + lockMetadata.LockRowId);
}