/// <summary>
/// Enumerate known selectors for a given weak fingerprint.
/// </summary>
internal Result <Selector[]> GetSelectorsCore(Context context, Fingerprint weakFingerprint, CancellationToken cts)
{
var stopwatch = new Stopwatch();
try
{
_tracer.GetSelectorsStart(context, weakFingerprint);
stopwatch.Start();
using (_lockSet.AcquireAsync(weakFingerprint).Result)
{
Selector[] records = _records
.Where(r => r.StrongFingerprint.WeakFingerprint.Equals(weakFingerprint))
.Select(r => r.StrongFingerprint.Selector)
.ToArray();
return(Result.Success(records));
}
}
catch (Exception exception)
{
_tracer.Debug(context, $"{Component}.GetSelectors() error=[{exception}]");
return(Result.FromException <Selector[]>(exception));
}
finally
{
stopwatch.Stop();
_tracer.GetSelectorsStop(context, stopwatch.Elapsed);
}
}
public async Task AcquireImmediatelyNotBlockedAndReturnsNullWhenKeyHeld()
{
var lockSet = new LockSet <string>();
using (await lockSet.AcquireAsync("key1"))
{
using (var handle = lockSet.TryAcquire("key1"))
{
handle.Should().BeNull();
}
}
}
public async Task <Result <AbsolutePath> > BackupAsync(OperationContext context, AbsolutePath instancePath, string?name = null)
{
int numCopiedFiles = 0;
AbsolutePath?backupPath = null;
return(await context.PerformOperationAsync(_tracer, async() =>
{
var backupTime = _clock.UtcNow.ToString("yyyyMMdd_HHmmss", CultureInfo.InvariantCulture);
var backupName = backupTime;
if (!string.IsNullOrEmpty(name))
{
backupName += $"-{name}";
}
backupPath = _backupPath / backupName;
// Unlikely, but it is possible for GC to start running and think that it should purge this directory,
// this avoids the scenario.
using var _ = await _locks.AcquireAsync(backupPath);
if (_fileSystem.DirectoryExists(backupPath))
{
_fileSystem.DeleteDirectory(backupPath, DeleteOptions.All);
}
_fileSystem.CreateDirectory(backupPath);
// See: https://github.com/facebook/rocksdb/wiki/rocksdb-basics#database-debug-logs
_fileSystem.EnumerateFiles(instancePath, "*LOG*", false,
fileInfo =>
{
var fileName = fileInfo.FullPath.FileName;
var targetFilePath = backupPath / fileName;
// Do not use Async here: since EnumerateFiles takes an Action, making this async means we'll
// need to make the action async as well, which is equivalent to an async void function. That
// leads to race conditions.
#pragma warning disable AsyncFixer02 // Long running or blocking operations under an async method
_fileSystem.CopyFile(fileInfo.FullPath, targetFilePath, replaceExisting: true);
#pragma warning restore AsyncFixer02 // Long running or blocking operations under an async method
++numCopiedFiles;
});
if (numCopiedFiles == 0)
{
_fileSystem.DeleteDirectory(backupPath, DeleteOptions.All);
}
return new Result <AbsolutePath>(backupPath);
}, extraEndMessage : _ => $"From=[{instancePath}] To=[{backupPath?.ToString() ?? "Unknown"}] NumCopiedFiles=[{numCopiedFiles}]"));
public async Task <Result <AbsolutePath> > BackupAsync(OperationContext context, AbsolutePath instancePath, string?name = null)
{
int numCopiedFiles = 0;
AbsolutePath?backupPath = null;
return(await context.PerformOperationAsync(_tracer, async() =>
{
var backupTime = _clock.UtcNow.ToString("yyyyMMdd_HHmmss", CultureInfo.InvariantCulture);
var backupName = backupTime;
if (!string.IsNullOrEmpty(name))
{
backupName += $"-{name}";
}
backupPath = _backupPath / backupName;
// Unlikely, but it is possible for GC to start running and think that it should purge this directory,
// this avoids the scenario.
using var _ = await _locks.AcquireAsync(backupPath);
if (_fileSystem.DirectoryExists(backupPath))
{
_fileSystem.DeleteDirectory(backupPath, DeleteOptions.All);
}
_fileSystem.CreateDirectory(backupPath);
// See: https://github.com/facebook/rocksdb/wiki/rocksdb-basics#database-debug-logs
_fileSystem.EnumerateFiles(instancePath, "*LOG*", false,
async fileInfo =>
{
var fileName = fileInfo.FullPath.FileName;
var targetFilePath = backupPath / fileName;
await _fileSystem.CopyFileAsync(fileInfo.FullPath, targetFilePath, replaceExisting: true);
++numCopiedFiles;
});
if (numCopiedFiles == 0)
{
_fileSystem.DeleteDirectory(backupPath, DeleteOptions.All);
}
return new Result <AbsolutePath>(backupPath);
}, extraEndMessage : _ => $"From=[{instancePath}] To=[{backupPath?.ToString() ?? "Unknown"}] NumCopiedFiles=[{numCopiedFiles}]"));
public void DoubleDisposeShouldNotFailForLockHandleList()
{
var handles = _lockSet.AcquireAsync(new [] { "key1", "key2" });
handles.Dispose();
// Dispose pattern implies that double dispose should never fail.
handles.Dispose();
}
