public static async Task <ILock> AcquireAsync(this ILockProvider provider, IEnumerable <string> resources, TimeSpan?timeUntilExpires = null, CancellationToken cancellationToken = default)
{
if (resources == null)
{
throw new ArgumentNullException(nameof(resources));
}
var resourceList = resources.Distinct().ToArray();
if (resourceList.Length == 0)
{
return(new EmptyLock());
}
var logger = provider.GetLogger();
if (logger.IsEnabled(LogLevel.Trace))
{
logger.LogTrace("Acquiring {LockCount} locks {Resource}", resourceList.Length, resourceList);
}
var sw = Stopwatch.StartNew();
var locks = await Task.WhenAll(resourceList.Select(r => provider.AcquireAsync(r, timeUntilExpires, cancellationToken)));
sw.Stop();
// if any lock is null, release any acquired and return null (all or nothing)
var acquiredLocks = locks.Where(l => l != null).ToArray();
var unacquiredResources = resourceList.Except(locks.Select(l => l?.Resource)).ToArray();
if (unacquiredResources.Length > 0)
{
if (logger.IsEnabled(LogLevel.Trace))
{
logger.LogTrace("Unable to acquire all {LockCount} locks {Resource} releasing acquired locks", unacquiredResources.Length, unacquiredResources);
}
await Task.WhenAll(acquiredLocks.Select(l => l.ReleaseAsync())).AnyContext();
return(null);
}
if (logger.IsEnabled(LogLevel.Trace))
{
logger.LogTrace("Acquired {LockCount} locks {Resource} after {Duration:g}", resourceList.Length, resourceList, sw.Elapsed);
}
return(new DisposableLockCollection(locks, String.Join("+", locks.Select(l => l.LockId)), sw.Elapsed, logger));
}
