public async Task ExecuteInSemaphore(SemaphoreOptions opts, Action a, CancellationToken ct = default(CancellationToken))
{
if (opts == null)
{
throw new ArgumentNullException(nameof(opts));
}
if (a == null)
{
throw new ArgumentNullException(nameof(a));
}
var semaphore = await AcquireSemaphore(opts, ct).ConfigureAwait(false);
try
{
if (!semaphore.IsHeld)
{
throw new LockNotHeldException("Could not obtain the lock");
}
a();
}
finally
{
await semaphore.Release(ct).ConfigureAwait(false);
}
}
public IDisposableSemaphore AcquireSemaphore(SemaphoreOptions opts)
{
if (opts == null)
{
throw new ArgumentNullException("opts");
}
return(new AutoSemaphore(this, opts));
}
public AutoSemaphore AcquireSemaphore(SemaphoreOptions opts)
{
if (opts == null)
{
throw new ArgumentNullException("opts");
}
return new AutoSemaphore(this, opts);
}
/// <summary>
/// SemaphoreOpts is used to create a Semaphore with the given options.
/// The prefix must have write privileges, and the limit must be agreed upon by all contenders.
/// If a Session is not provided, one will be created.
/// </summary>
/// <param name="opts">The semaphore options</param>
/// <returns>An unlocked semaphore</returns>
public IDistributedSemaphore Semaphore(SemaphoreOptions opts)
{
if (opts == null)
{
throw new ArgumentNullException(nameof(opts));
}
return(new Semaphore(this)
{
Opts = opts
});
}
public async Task <IDistributedSemaphore> AcquireSemaphore(SemaphoreOptions opts, CancellationToken ct = default(CancellationToken))
{
if (opts == null)
{
throw new ArgumentNullException(nameof(opts));
}
var semaphore = Semaphore(opts);
await semaphore.Acquire(ct).ConfigureAwait(false);
return(semaphore);
}
public void ExecuteInSemaphore(SemaphoreOptions opts, Action a)
{
if (opts == null)
{
throw new ArgumentNullException("opts");
}
if (a == null)
{
throw new ArgumentNullException("a");
}
using (var l = new AutoSemaphore(this, opts))
{
if (l.IsHeld)
{
a();
}
}
}
internal AutoSemaphore(Client c, SemaphoreOptions opts)
: base(c)
{
Opts = opts;
CancellationToken = Acquire();
}
/// <summary>
/// SemaphoreOpts is used to create a Semaphore with the given options.
/// The prefix must have write privileges, and the limit must be agreed upon by all contenders.
/// If a Session is not provided, one will be created.
/// </summary>
/// <param name="opts">The semaphore options</param>
/// <returns>An unlocked semaphore</returns>
public Semaphore Semaphore(SemaphoreOptions opts)
{
if (opts == null)
{
throw new ArgumentNullException("opts");
}
return new Semaphore(this) { Opts = opts };
}
public void ExecuteInSemaphore(SemaphoreOptions opts, Action a)
{
if (opts == null)
{
throw new ArgumentNullException("opts");
}
if (a == null)
{
throw new ArgumentNullException("a");
}
using (var l = new AutoSemaphore(this, opts))
{
if (l.IsHeld)
{
a();
}
}
}
internal AutoSemaphore(ConsulClient c, SemaphoreOptions opts)
: base(c)
{
Opts = opts;
CancellationToken = Acquire();
}
void AllInOne(ManagedService svc)
{
MyLogger.Trace("Entering {0} for service: {1}", MethodBase.GetCurrentMethod().Name, svc.ConsulServiceName);
// Wait if service is ready to manage
if (!svc.CanRun) MyLogger.Info("Wait for service {0} to get in a ready state", svc.ConsulServiceName);
while (!_shouldStop && !svc.CanRun && svc.ShouldRun)
{
Thread.Sleep(1000);
}
MyLogger.Debug("Service {0} is ready, wait for lock", svc.ConsulServiceName);
while (!_shouldStop && svc.ShouldRun)
{
var semaphoreOptions = new SemaphoreOptions(Config.KvPrefix + Config.SemaPrefix + svc.ConsulServiceName,
svc.Limit) { SessionName = svc.ConsulServiceName + "_Session", SessionTTL = TimeSpan.FromSeconds(10) };
var semaphore = ConsulClient.Semaphore(semaphoreOptions);
// Try to get a lock until it is aqcuired or the program should stop
while (!_shouldStop && !semaphore.IsHeld && svc.ShouldRun)
{
MyLogger.Info("Acquiring lock on semaphore for {0}", svc.ConsulServiceName);
try
{
semaphore.Acquire();
}
catch
{
Thread.Sleep(1000);
}
}
// if the program should not stop and the semaphore is aqcuired, start the service
if (!_shouldStop && svc.ShouldRun && semaphore.IsHeld && (ServiceHelper.GetServiceStatus(svc.WindowsServiceName) != "Running"))
{
bool svcstarted = StartService(svc);
MyLogger.Info("Service {0} send start command with success: {1}", svc.WindowsServiceName, svcstarted);
}
// Make sure the service runs while the lock is held or the program should stop, otherwise stop the service and releade the lock
while (!_shouldStop && svc.ShouldRun && semaphore.IsHeld)
{
ServiceController sc = new ServiceController(svc.WindowsServiceName);
if (sc.Status != ServiceControllerStatus.Running)
{
MyLogger.Debug("Service not running, releasing lock");
if (semaphore.IsHeld) semaphore.Release();
}
sc.Close();
}
if (_shouldStop || !svc.ShouldRun)
{
if (ServiceHelper.GetServiceStatus(svc.WindowsServiceName) == "Running")
{
bool svcstopped = StopService(svc);
MyLogger.Info("Service {0} send stop command with success: {1}", svc.WindowsServiceName, svcstopped);
}
if (semaphore.IsHeld) semaphore.Release();
try
{
semaphore.Destroy();
}
catch (Exception ex)
{
MyLogger.Error("some error: {0}",ex.Message);
MyLogger.Debug(ex);
}
}
else
{
MyLogger.Info("Lock no longer held for {0}",svc.WindowsServiceName);
//Release lock because it could be the lock isheld was set to false due to consistency timeout
try
{
semaphore.Release();
}
catch (SemaphoreNotHeldException)
{
}
catch (Exception ex1) {
MyLogger.Error("Some error: {0}",ex1.Message);
MyLogger.Debug(ex1);
}
if (ServiceHelper.GetServiceStatus(svc.WindowsServiceName) == "Running")
{
bool svcstopped = StopService(svc);
MyLogger.Info("Service {0} send stop command with success: {1}", svc.WindowsServiceName, svcstopped);
}
}
}
}
private void GetLock()
{
Console.WriteLine("Trying to acquire lock");
if (_semaphore != null) try { _semaphore.Destroy(); }
catch (SemaphoreInUseException) { }
_semaphoreOptions = new SemaphoreOptions(Prefix, Limit) { SessionName = Name + "_Session", SessionTTL = TimeSpan.FromSeconds(10) };
_semaphore = _parent.ConsulClient.Semaphore(_semaphoreOptions);
_semaphore.Acquire(_getLockCancellationTokenSource.Token);
if (_getLockCancellationTokenSource.IsCancellationRequested)
{
Console.WriteLine("Cancelling Lock aqcuisition");
}
else
{
Console.WriteLine("Lock acquired, becoming active");
_actionThread = ActionThread();
_actionThread.Start();
}
}
