private IChangeToken GetOrAddChangeToken(string filePath)
{
ChangeTokenInfo tokenInfo;
if (!_matchInfoCache.TryGetValue(filePath, out tokenInfo))
{
var cancellationTokenSource = new CancellationTokenSource();
var cancellationChangeToken = new CancellationChangeToken(cancellationTokenSource.Token);
tokenInfo = new ChangeTokenInfo(cancellationTokenSource, cancellationChangeToken);
tokenInfo = _matchInfoCache.GetOrAdd(filePath, tokenInfo);
}
IChangeToken changeToken = tokenInfo.ChangeToken;
if (_pollForChanges)
{
// The expiry of CancellationChangeToken is controlled by this type and consequently we can cache it.
// PollingFileChangeToken on the other hand manages its own lifetime and consequently we cannot cache it.
changeToken = new CompositeFileChangeToken(
new[]
{
changeToken,
new PollingFileChangeToken(new FileInfo(filePath))
});
}
return(changeToken);
}
private IChangeToken GetOrAddWildcardChangeToken(string pattern)
{
ChangeTokenInfo tokenInfo;
if (!_wildcardTokenLookup.TryGetValue(pattern, out tokenInfo))
{
var cancellationTokenSource = new CancellationTokenSource();
var cancellationChangeToken = new CancellationChangeToken(cancellationTokenSource.Token);
var matcher = new Matcher(StringComparison.OrdinalIgnoreCase);
matcher.AddInclude(pattern);
tokenInfo = new ChangeTokenInfo(cancellationTokenSource, cancellationChangeToken, matcher);
tokenInfo = _wildcardTokenLookup.GetOrAdd(pattern, tokenInfo);
}
IChangeToken changeToken = tokenInfo.ChangeToken;
if (_pollForChanges)
{
// The expiry of CancellationChangeToken is controlled by this type and consequently we can cache it.
// PollingFileChangeToken on the other hand manages its own lifetime and consequently we cannot cache it.
changeToken = new CompositeFileChangeToken(
new[]
{
changeToken,
new PollingWildCardChangeToken(_root, pattern)
});
}
return(changeToken);
}