public static IChangeToken GetOrAddFileChangeToken(string fullname, ConcurrentDictionary <string, ChangeTokenInfo> fileTokenLookup)
{
var pattern = NormalizePath(fullname);
ChangeTokenInfo tokenInfo;
if (!fileTokenLookup.TryGetValue(fullname, out tokenInfo))
{
var cancellationTokenSource = new CancellationTokenSource();
var cancellationChangeToken = new CancellationChangeToken(cancellationTokenSource.Token);
tokenInfo = new ChangeTokenInfo(cancellationTokenSource, cancellationChangeToken);
tokenInfo = fileTokenLookup.GetOrAdd(fullname, tokenInfo);
}
IChangeToken changeToken = tokenInfo.ChangeToken;
return(changeToken);
}
public static void CancelToken(ChangeTokenInfo matchInfo)
{
if (matchInfo.TokenSource.IsCancellationRequested)
{
return;
}
Task.Run(() =>
{
try
{
matchInfo.TokenSource.Cancel();
}
catch
{
}
});
}