private T GetChromeRootFolderWorker(FullPathName filename, Func <FullPathName, T> factory)
{
var root = _chromiumDiscovery.GetEnlistmentRoot(filename);
if (root == default(FullPathName))
{
lock (_lock) {
// No one in the parent chain is a Chromium directory.
filename.EnumerateParents().ForAll(x => _nonChromiumDirectories.Add(x, null));
}
return(default(T));
}
var result = factory(root);
lock (_lock) {
_chromiumRootDirectories.Add(root, result);
}
return(result);
}
public T GetEnlistmentRootFromFilename(FullPathName filename, Func <FullPathName, T> factory)
{
lock (_lock) {
// Cache hit?
foreach (var parent in filename.EnumerateParents())
{
T value;
if (_chromiumRootDirectories.TryGet(parent, out value))
{
return(value);
}
}
// Negative cache hit?
if (_nonChromiumDirectories.Contains(filename.Parent))
{
return(default(T));
}
}
// Nope: compute all the way...
return(GetChromeRootFolderWorker(filename, factory));
}