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);
}
}
/// <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);
}