public GitVersionedConfigProvider(IGitApi git, string repository, string path, string branch, TimeSpan ttl, TimeSpan invalidTtl)
{
_git = git ?? throw new NullReferenceException(nameof(git));
_ttl = ttl;
_invalidTtl = invalidTtl;
_gitQuery = new GitQuery(repository, path, branch);
_current = TimedEntry.Create(VersionConfig.Fail(new InvalidOperationException()), TimeSpan.Zero);
}
private TimedEntry <VersionedConfig> ReadData()
{
VersionedConfig vc;
try
{
//as all infrastructure is sync
var gitItem = _git.GetFile(_gitQuery).ConfigureAwait(false).GetAwaiter().GetResult();
vc = new VersionedConfig(gitItem);
}
catch (Exception ex)
{
return(TimedEntry.Create(VersionConfig.Fail(ex), _invalidTtl));
}
return(TimedEntry.Create(vc, _ttl));
}
public VersionedConfig GetConfig()
{
if (_current.IsValid)
{
return(_current.Value);
}
if (Interlocked.CompareExchange(ref _loading, 1, 0) == 0)
{
var updated = ReadData();
if (updated.Value.LastError == null)
{
_current = updated;
Interlocked.Decrement(ref _loading);
return(_current.Value);
}
Interlocked.Decrement(ref _loading);
}
return(_current.Value);
}