public AsyncLock()
{
m_semaphore = new AsyncSemaphore(1);
#if NET4_0
m_releaser = TaskEx.FromResult(new Releaser(this));
#else
m_releaser = Task.FromResult(new Releaser(this));
#endif
}
public void ItCompletesTheTasksWhenWaitAsyncIsCalledSampleTimes()
{
var asyncSemaphore = new AsyncSemaphore(SampleTimes);
var tasks = new Task[SampleTimes];
for (int i = 0; i < SampleTimes; i++)
{
tasks[i] = asyncSemaphore.WaitAsync();
}
var task = Task.WhenAll(tasks);
task.Wait(TimeSpan.FromSeconds(1));
Assert.IsTrue(task.IsCompleted);
}
public void ItReturnsNewUncompletedTasksWhenWaitAsyncIsCalledSamplePlusOneTimes()
{
var asyncSemaphore = new AsyncSemaphore(SampleTimes);
var tasks = new Task[SampleTimes];
for (int i = 0; i < SampleTimes; i++)
{
tasks[i] = asyncSemaphore.WaitAsync();
}
var task = Task.WhenAll(tasks);
task.Wait(TimeSpan.FromSeconds(1));
var newTask = asyncSemaphore.WaitAsync();
Assert.IsTrue(newTask != task && task.IsCompleted && !newTask.IsCompleted);
}
public async Task TooManyReleases_CopyOfStruct()
{
var sem = new AsyncSemaphore(2);
AsyncSemaphore.Releaser releaser1 = await sem.EnterAsync();
AsyncSemaphore.Releaser releaser2 = await sem.EnterAsync();
// Assigning the releaser struct to another local variable copies it.
AsyncSemaphore.Releaser releaser2Copy = releaser2;
// Dispose of each copy of the releaser.
// The double-release is undetectable. The semaphore should be back at capacity 2.
releaser2.Dispose();
Assert.Equal(1, sem.CurrentCount);
releaser2Copy.Dispose();
Assert.Equal(2, sem.CurrentCount);
releaser1.Dispose();
Assert.Equal(3, sem.CurrentCount);
}
protected virtual void Dispose(bool disposing)
{
if (!disposing)
{
return;
}
try
{
if (this.connection != null)
{
lock (this.thisLock)
{
if (this.connection != null)
{
this.connection.Close();
this.connection = null;
}
}
}
}
finally
{
try
{
if (this.semaphore != null)
{
this.semaphore.Dispose();
this.semaphore = null;
}
}
finally
{
if (File.Exists(this.pathSchema))
{
File.Delete(this.pathSchema);
}
}
}
}
public async Task DisposeLock()
{ //****************************************
var MyLock = new AsyncSemaphore();
//****************************************
var MyDispose = MyLock.DisposeAsync();
try
{
MyLock.Take().GetAwaiter().GetResult().Dispose();
}
catch (ObjectDisposedException)
{
}
//****************************************
await MyDispose;
Assert.AreEqual(0, MyLock.WaitingCount, "Still waiting for Semaphore");
Assert.AreEqual(MyLock.MaxCount, MyLock.CurrentCount, "Semaphore still held");
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
AsyncSemaphore[] semaphores = Interlocked.Exchange(ref _semaphores, null);
if (semaphores == null)
{
return;
}
List <Exception> ex = null;
for (int i = 0; i < semaphores.Length; i++)
{
try
{
AsyncSemaphore sem = Interlocked.Exchange(ref semaphores[i], null);
sem?.Release();
}
catch (Exception e)
{
if (ex == null)
{
ex = new List <Exception>();
}
ex.Add(e);
}
}
if (ex == null ||
ex.Count < 1)
{
return;
}
// ReSharper disable once AssignNullToNotNullAttribute
if (ex.Count < 2)
{
ex[0].ReThrow();
}
throw new AggregateException(ex);
}
public SemanticChangeProcessor(
IAsynchronousOperationListener listener,
int correlationId,
Workspace workspace,
IncrementalAnalyzerProcessor documentWorkerProcessor,
int backOffTimeSpanInMS,
int projectBackOffTimeSpanInMS,
CancellationToken cancellationToken) :
base(listener, backOffTimeSpanInMS, cancellationToken)
{
this.gate = new AsyncSemaphore(initialCount: 0);
this.correlationId = correlationId;
this.workspace = workspace;
this.processor = new ProjectProcessor(listener, correlationId, workspace, documentWorkerProcessor, projectBackOffTimeSpanInMS, cancellationToken);
this.workGate = new NonReentrantLock();
this.pendingWork = new Dictionary <DocumentId, Data>();
Start();
}
public RazorProjectHostBase(
IUnconfiguredProjectCommonServices commonServices,
[Import(typeof(VisualStudioWorkspace))] Workspace workspace,
RazorProjectChangePublisher razorProjectChangePublisher)
: base(commonServices.ThreadingService.JoinableTaskContext)
{
if (commonServices == null)
{
throw new ArgumentNullException(nameof(commonServices));
}
if (workspace == null)
{
throw new ArgumentNullException(nameof(workspace));
}
CommonServices = commonServices;
_workspace = workspace;
_lock = new AsyncSemaphore(initialCount: 1);
_currentDocuments = new Dictionary <string, HostDocument>(FilePathComparer.Instance);
_razorProjectChangePublisher = razorProjectChangePublisher;
}
public async Task TryTakeLock()
{ //****************************************
var MyLock = new AsyncSemaphore();
//****************************************
Assert.True(MyLock.TryTake(out var MyHandle), "Lock not taken");
var MyWait = MyLock.Take();
Assert.IsFalse(MyWait.IsCompleted, "Nested lock taken");
MyHandle.Dispose();
MyHandle = await MyWait;
MyHandle.Dispose();
//****************************************
Assert.AreEqual(0, MyLock.WaitingCount, "Still waiting for Semaphore");
Assert.AreEqual(MyLock.MaxCount, MyLock.CurrentCount, "Semaphore still held");
}
public async Task LockCancelLockLock()
{ //****************************************
var MyLock = new AsyncSemaphore();
var Resource = false;
ValueTask <AsyncSemaphore.Instance> MyWaiter1, MyWaiter2;
//****************************************
using (var MySource = new CancellationTokenSource())
{
using (await MyLock.Take())
{
MyWaiter1 = MyLock.Take(MySource.Token);
MyWaiter2 = MyLock.Take();
MySource.Cancel();
Assert.IsTrue(MyWaiter1.IsCanceled, "Wait not cancelled");
Assert.IsFalse(MyWaiter2.IsCompleted, "Nested lock taken");
Resource = true;
}
}
//****************************************
await MyWaiter2;
Assert.IsTrue(Resource, "Block not entered");
MyWaiter2.Result.Dispose();
Assert.AreEqual(0, MyLock.WaitingCount, "Still waiting for Semaphore");
Assert.AreEqual(MyLock.MaxCount, MyLock.CurrentCount, "Semaphore still held");
}
public void TryTakeCancel()
{ //****************************************
var MyLock = new AsyncSemaphore();
//****************************************
Assert.True(MyLock.TryTake(out var MyHandle1), "Lock not taken");
using (var MyCancel = new CancellationTokenSource())
{
MyCancel.CancelAfter(50);
var StartTime = DateTime.Now;
try
{
MyLock.TryTake(out _, MyCancel.Token);
Assert.Fail("Nested lock taken");
}
catch (OperationCanceledException)
{
}
var EndTime = DateTime.Now;
Assert.GreaterOrEqual((EndTime - StartTime).TotalMilliseconds, 50.0, "Finished too early");
}
MyHandle1.Dispose();
//****************************************
Assert.AreEqual(0, MyLock.WaitingCount, "Still waiting for Semaphore");
Assert.AreEqual(MyLock.MaxCount, MyLock.CurrentCount, "Semaphore still held");
}
public void TryTakeMaxTime()
{ //****************************************
var MyLock = new AsyncSemaphore();
//****************************************
Assert.True(MyLock.TryTake(out var MyHandle1), "Lock not taken");
var StartTime = DateTime.Now;
Assert.False(MyLock.TryTake(out _, TimeSpan.FromMilliseconds(50)), "Nested lock taken");
var EndTime = DateTime.Now;
MyHandle1.Dispose();
//****************************************
Assert.GreaterOrEqual((EndTime - StartTime).TotalMilliseconds, 50.0, "Finished too early");
Assert.AreEqual(0, MyLock.WaitingCount, "Still waiting for Semaphore");
Assert.AreEqual(MyLock.MaxCount, MyLock.CurrentCount, "Semaphore still held");
}
public MacRazorProjectHostBase(
DotNetProject project,
ProjectSnapshotManagerDispatcher projectSnapshotManagerDispatcher,
ProjectSnapshotManagerBase projectSnapshotManager,
ProjectConfigurationFilePathStore projectConfigurationFilePathStore)
{
if (project is null)
{
throw new ArgumentNullException(nameof(project));
}
if (projectSnapshotManagerDispatcher is null)
{
throw new ArgumentNullException(nameof(projectSnapshotManagerDispatcher));
}
if (projectSnapshotManager is null)
{
throw new ArgumentNullException(nameof(projectSnapshotManager));
}
if (projectConfigurationFilePathStore is null)
{
throw new ArgumentNullException(nameof(projectConfigurationFilePathStore));
}
DotNetProject = project;
ProjectSnapshotManagerDispatcher = projectSnapshotManagerDispatcher;
_projectSnapshotManager = projectSnapshotManager;
ProjectConfigurationFilePathStore = projectConfigurationFilePathStore;
_onProjectChangedInnerSemaphore = new AsyncSemaphore(initialCount: 1);
_projectChangedSemaphore = new AsyncSemaphore(initialCount: 1);
_currentDocuments = new Dictionary <string, HostDocument>(FilePathComparer.Instance);
AttachToProject();
}
public AsyncLock()
{
m_semaphore = new AsyncSemaphore(1);
m_releaser = Task.FromResult(new Releaser(this));
}
public MainPage()
{
this.InitializeComponent();
_ = new AsyncSemaphore(1);
new MessageDialog("dsgfadsf").ShowAsync().AsTask().Forget();
}
/// <summary>
/// Disposes of managed resources.
/// </summary>
/// <param name="asyncSemaphore">The <see cref="T:Nito.AsyncEx.AsyncSemaphore"/> instance.</param>
public static void Dispose(this AsyncSemaphore asyncSemaphore)
{
// None to do. The original implementation of Nito.AsyncEx.AsyncSemaphore is not IDisposable.
}
public void WhenClientsCountIsLessThen_SemaphoreShouldNotMakeClientsWaitedAsync()
{
var sut = new AsyncSemaphore(3);
ConcurrentAssert.EnsureThatTaskIsCompleted(Task.WhenAll(sut.WaitAsync(), sut.WaitAsync()));
}
public DialogService()
{
_lock = new AsyncSemaphore(1);
}
public void ItReturnsTaskWhenWaitAsyncIsCalled()
{
var asyncSemaphore = new AsyncSemaphore(SampleTimes);
Assert.IsInstanceOfType(asyncSemaphore.WaitAsync(), typeof(Task));
}
public CommaDelimitedFileAdapter(string filePath, IReadOnlyCollection<string> columnNames)
{
if (string.IsNullOrWhiteSpace(filePath))
{
throw new ArgumentNullException(CommaDelimitedFileAdapter.ArgumentNameFilePath);
}
if (null == columnNames)
{
throw new ArgumentNullException(CommaDelimitedFileAdapter.ArgumentNameColumnNames);
}
this.headers = this.ComposeHeaders(columnNames);
this.headersNormalized =
this
.headers
.Select(
(string item) =>
item.ToUpperInvariant())
.ToArray();
this.header = string.Join(CommaDelimitedFileAdapter.Comma, this.headers);
this.FilePath = System.IO.Path.GetFullPath(filePath);
this.pathFolder = System.IO.Path.GetDirectoryName(this.FilePath);
if (!Directory.Exists(this.pathFolder))
{
Directory.CreateDirectory(pathFolder);
}
this.fileName = System.IO.Path.GetFileName(FilePath);
this.pathSchema = System.IO.Path.Combine(this.pathFolder, CommaDelimitedFileAdapter.SchemaFileName);
this.schema =
string.Format(
CultureInfo.InvariantCulture,
CommaDelimitedFileAdapter.SchemaFileTemplate,
this.fileName);
this.ValidateFile(columnNames);
string connectionString =
string.Format(
CultureInfo.InvariantCulture,
CommaDelimitedFileAdapter.ConnectionStringTemplate,
pathFolder);
this.connection = new OleDbConnection(connectionString);
this.connection.Open();
this.semaphore = new AsyncSemaphore(1);
}
/// <summary>
/// Reset the number of connections we allow to remote machines at once.
/// </summary>
/// <param name="numberOfConnections"></param>
/// <remarks>
/// This doesn't wait to drain current connections. It just opens up new slots - the old connections will
/// eventually terminate and the system will drift towards the proper number of active connections.
/// </remarks>
public static void ResetAllowedSimultaniousConnections(uint numberOfConnections)
{
_gConnectionInterlockLimiter = new AsyncSemaphore(numberOfConnections);
}
/// <summary>
/// Downloads binary (non-"Google Docs") file.
/// </summary>
/// <param name="service">Google Drive service used to download a file.</param>
/// <param name="file">Meta-information about file to download.</param>
/// <param name="semaphore">Semaphore used to throttle downloading process.</param>
/// <param name="unitsOfWork">Abstract units of work assigned to download this file. Used in progress reporting.</param>
/// <param name="directories">Dictionary that contains possible directories to save a file.</param>
/// <returns>Information about downloaded file, null if downloading failed.</returns>
/// <exception cref="InternalErrorException">Something is wrong with downloader code itself.</exception>
public async Task <DownloadedFile> DownloadBinaryFile(
DriveService service,
File file,
AsyncSemaphore semaphore,
int unitsOfWork,
IDictionary <File, IEnumerable <DirectoryInfo> > directories)
{
this.Info = file.Name;
this.Estimation = unitsOfWork;
if (file.Size.HasValue && (file.Size.Value == 0))
{
try
{
var fileName = FileDownloadUtils.GetFileName(file, directories);
System.IO.File.Create(fileName);
this.Done();
return(new DownloadedFile(file, fileName));
}
catch (Exception e)
{
this.Log.LogError($"Saving zero-length file '{file.Name}' error.", e);
this.StatusAccumulator.FailureOccurred();
throw;
}
}
var request = service.Files.Get(file.Id);
request.MediaDownloader.ProgressChanged += downloadProgress =>
{
switch (downloadProgress.Status)
{
case DownloadStatus.NotStarted:
break;
case DownloadStatus.Downloading:
this.Progress = (int)(downloadProgress.BytesDownloaded * unitsOfWork / (file.Size ?? 1));
break;
case DownloadStatus.Completed:
this.Progress = this.Estimation;
break;
case DownloadStatus.Failed:
this.Progress = this.Estimation;
if (!this.CancellationToken.IsCancellationRequested)
{
this.Status = Status.Error;
this.Log.LogError($"Downloading file '{file.Name}' error.", downloadProgress.Exception);
this.StatusAccumulator.FailureOccurred();
}
break;
default:
throw new InternalErrorException("DownloadStatus enum contains unknown value.");
}
};
await semaphore.WaitAsync();
this.Log.LogDebugMessage($"Starting to download '{file.Name}' binary file.");
try
{
var fileName = FileDownloadUtils.GetFileName(file, directories);
using (var fileStream = new FileStream(fileName, FileMode.Create))
{
await GoogleRequestHelper.Execute(
ct => request.DownloadAsync(fileStream, ct),
this.CancellationToken,
GoogleRequestHelper.Cooldown *Utils.Constants.DownloadThreadsCount);
}
var fileInfo = FileDownloadUtils.CorrectFileTimes(file, fileName);
this.Log.LogDebugMessage($"File '{file.Name}' downloading finished, saved as {fileInfo.FullName}.");
this.StatusAccumulator.SuccessItem();
this.Done();
return(new DownloadedFile(file, fileInfo.FullName));
}
catch (Exception e)
{
if (this.CancellationToken.IsCancellationRequested)
{
throw;
}
this.Log.LogError($"Downloading file '{file.Name}' error.", e);
this.StatusAccumulator.FailureOccurred();
throw;
}
finally
{
semaphore.Release();
}
}
public MaxConnectionsEnforcer(int maxConnections)
{
semaphore = new AsyncSemaphore(maxConnections);
}
/// <summary>
/// A probe attempt to one destination.
/// </summary>
private async Task ProbeDestinationAsync(DestinationInfo destination, AsyncSemaphore semaphore, CancellationToken cancellationToken)
{
// Conduct a dither for every endpoint probe to optimize concurrency.
var randomDither = _randomFactory.CreateRandomInstance();
await _timer.Delay(TimeSpan.FromMilliseconds(randomDither.Next(_ditheringIntervalInMilliseconds)), cancellationToken);
var outcome = HealthProbeOutcome.Unknown;
string logDetail = null;
// Enforce max concurrency.
await semaphore.WaitAsync();
Log.ProberStarted(_logger, BackendId, destination.DestinationId);
try
{
using (var timeoutCts = CancellationTokenSource.CreateLinkedTokenSource(_cts.Token))
{
// Set up timeout and start probing.
timeoutCts.CancelAfter(_httpTimeoutInterval, _timer);
var response = await _operationLogger.ExecuteAsync(
"ReverseProxy.Service.HealthProbe",
() => _backendProbeHttpClient.GetAsync(new Uri(new Uri(destination.Config.Value.Address, UriKind.Absolute), _healthControllerUrl), timeoutCts.Token));
// Collect response status.
outcome = response.IsSuccessStatusCode ? HealthProbeOutcome.Success : HealthProbeOutcome.HttpFailure;
logDetail = $"Received status code {(int)response.StatusCode}";
}
}
catch (HttpRequestException ex)
{
// If there is a error during the http request process. Swallow the error and log error message.
outcome = HealthProbeOutcome.TransportFailure;
logDetail = ex.Message;
}
catch (OperationCanceledException)
{
// If the cancel requested by our StopAsync method. It is a expected graceful shut down.
if (_cts.IsCancellationRequested)
{
outcome = HealthProbeOutcome.Canceled;
logDetail = "Operation deliberately canceled";
throw;
}
else
{
outcome = HealthProbeOutcome.Timeout;
logDetail = $"Health probe timed out after {Config.HealthCheckOptions.Interval.TotalSeconds} second";
}
}
catch (Exception ex)
{
throw new Exception($"Prober for '{destination.DestinationId}' encounters unexpected exception.", ex);
}
finally
{
if (outcome != HealthProbeOutcome.Canceled)
{
// Update the health state base on the response.
var healthState = outcome == HealthProbeOutcome.Success ? DestinationHealth.Healthy : DestinationHealth.Unhealthy;
destination.DynamicState.Value = new DestinationDynamicState(healthState);
Log.ProberResult(_logger, destination.DestinationId, outcome, logDetail);
}
// The probe operation is done, release the semaphore to allow other probes to proceed.
semaphore.Release();
}
}
public NonblockingChannel(ConcurrentQueue <T> writeQueue, AsyncSemaphore readSemaphore, AsyncSemaphore writeSemaphore)
{
this.writeQueue = writeQueue;
this.readSemaphore = readSemaphore;
this.writeSemaphore = writeSemaphore;
}
public AsyncLock() {
_semaphore = new AsyncSemaphore(1);
_releaser = Task.Factory.FromResult(new Releaser(this));
}
/// <summary>
/// Initializes a new instance of the BlobReadStrea class.
/// </summary>
/// <param name="blob">Blob reference to read from</param>
/// <param name="accessCondition">An object that represents the access conditions for the blob. If null, no condition is used.</param>
/// <param name="options">An object that specifies any additional options for the request.</param>
/// <param name="operationContext">An <see cref="OperationContext"/> object for tracking the current operation.</param>
internal BlobReadStream(ICloudBlob blob, AccessCondition accessCondition, BlobRequestOptions options, OperationContext operationContext)
: base(blob, accessCondition, options, operationContext)
{
this.parallelOperationSemaphore = new AsyncSemaphore(1);
}
public ProjectLocalSecretsManager(IProjectPropertiesProvider propertiesProvider, Lazy <IServiceProvider> serviceProvider)
{
_propertiesProvider = propertiesProvider ?? throw new ArgumentNullException(nameof(propertiesProvider));
_services = serviceProvider ?? throw new ArgumentNullException(nameof(serviceProvider));
_semaphore = new AsyncSemaphore(1);
}
public void Id_IsNotZero()
{
AsyncSemaphore semaphore = new AsyncSemaphore(0);
Assert.NotEqual(0, semaphore.Id);
}
public void SetConcurrentCalls(int concurrentCalls)
{
_asyncSemaphore = new AsyncSemaphore(concurrentCalls);
Config.MaxConcurrentCalls = concurrentCalls;
}
/// <inheritdoc/>
public void Start(AsyncSemaphore semaphore)
{
// Start background work, wake up for every interval(set in backend config).
_backgroundPollingLoopTask = TaskScheduler.Current.Run(() => ProbeDestinationsAsync(semaphore, _cts.Token));
}
public AsyncLock()
{
_semaphore = new AsyncSemaphore();
_releaser = Task.FromResult((IDisposable) new Releaser(this));
}
public MongoIdentityStorage(string clusterName, IMongoCollection <PidLookupEntity> pids, int maxConcurrency = 50)
{
_asyncSemaphore = new AsyncSemaphore(maxConcurrency);
_clusterName = clusterName;
_pids = pids;
}
/// <summary>
/// Asynchronously downloads meta-information for one file.
/// </summary>
/// <param name="service">Google Drive service that is used to download files metainformation.</param>
/// <param name="file">File with filled Id field.</param>
/// <param name="semaphore">Semaphore used to throttle downloading process.</param>
/// <returns>Asynchronous task that downloads meta-information.</returns>
private async Task <File> DownloadFileMetaInformation(DriveService service, File file, AsyncSemaphore semaphore)
{
var fileInfoRequest = service.Files.Get(file.Id);
fileInfoRequest.Fields = "*";
await semaphore.WaitAsync();
try
{
var fileInfo = await GoogleRequestHelper.Execute(
fileInfoRequest.ExecuteAsync,
this.CancellationToken,
GoogleRequestHelper.Cooldown *Utils.Constants.DownloadThreadsCount);
++this.Progress;
this.StatusAccumulator.SuccessItem();
return(fileInfo);
}
catch (Exception e)
{
if (this.CancellationToken.IsCancellationRequested)
{
throw;
}
this.Log.LogError($"Downloading meta-information for file {file.Name} failed.", e);
this.StatusAccumulator.FailureOccurred();
throw;
}
finally
{
semaphore.Release();
}
}
public void ItReturnsTaskWhenWaitAsyncIsCalled()
{
var asyncSemaphore = new AsyncSemaphore(SampleTimes);
Assert.IsInstanceOfType(asyncSemaphore.WaitAsync(), typeof(Task));
}
public MaxConnectionsEnforcer(int maxConnections)
{
semaphore = new AsyncSemaphore(maxConnections);
}
