public void HasChanged_ReturnsFalseIfNoFilesExist()
{
// Arrange
var directoryInfo = new Mock <DirectoryInfoBase>();
directoryInfo.Setup(d => d.EnumerateFileSystemInfos())
.Returns(Enumerable.Empty <FileSystemInfoBase>());
var clock = new TestClock();
var token = new PollingWildCardChangeToken(directoryInfo.Object, "**/*.txt", clock);
// Act
clock.Increment();
var result = token.HasChanged;
// Assert
Assert.False(result);
}
internal IChangeToken GetOrAddWildcardChangeToken(string pattern)
{
if (!_wildcardTokenLookup.TryGetValue(pattern, out var 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.
var pollingChangeToken = new PollingWildCardChangeToken(_root, pattern);
if (UseActivePolling)
{
pollingChangeToken.ActiveChangeCallbacks = true;
pollingChangeToken.CancellationTokenSource = new CancellationTokenSource();
PollingChangeTokens.TryAdd(pollingChangeToken, pollingChangeToken);
}
changeToken = new CompositeChangeToken(
new[]
{
changeToken,
pollingChangeToken,
});
}
return(changeToken);
}
