asp.net-mvc – 如果Hangfire已经运行,请停止启动定期作业

我有类似的要求,基本上我想使用DisableConcurrentExecutionAttribute,但要考虑参数.这样,如果一个作业使用相同的参数排队,它仍然会不会并行运行.我拿了示例DisableMultipleQueuedItemsFilter,它实际上删除了作业并修改了DisableConcurrentExecutionAttribute以使用参数.不同之处在于,如果作业具有相同的参数列表,则它们将排队,它们不会并行运行.

这里可以看到完整的示例,包含两个属性：https://gist.github.com/sbosell/3831f5bb893b20e82c72467baf8aefea

属性的相关代码：

public class DisableConcurrentExecutionWithParametersAttribute : JobFilterAttribute,IServerFilter
    {
        private readonly int _timeoutInSeconds;

        public DisableConcurrentExecutionWithParametersAttribute (int timeoutInSeconds)
        {
            if (timeoutInSeconds < 0) throw new ArgumentException("Timeout argument value should be greater that zero.");

            _timeoutInSeconds = timeoutInSeconds;
        }

        public void OnPerforming(PerformingContext filterContext)
        {
            var resource = GetResource(filterContext.BackgroundJob.Job);

            var timeout = TimeSpan.FromSeconds(_timeoutInSeconds);

            var distributedLock = filterContext.Connection.AcquireDistributedLock(resource,timeout);
            filterContext.Items["DistributedLock"] = distributedLock;
        }

        public void OnPerformed(PerformedContext filterContext)
        {
            if (!filterContext.Items.ContainsKey("DistributedLock"))
            {
                throw new InvalidOperationException("Can not release a distributed lock: it was not acquired.");
            }

            var distributedLock = (IDisposable)filterContext.Items["DistributedLock"];
            distributedLock.Dispose();
        }

        private static string GetFingerprint(Job job)
        {
            var parameters = string.Empty;
            if (job?.Arguments != null)
            {
                parameters = string.Join(".",job.Arguments);
            }
            if (job?.Type == null || job.Method == null)
            {
                return string.Empty;
            }
            var payload = $"{job.Type.FullName}.{job.Method.Name}.{parameters}";
            var hash = SHA256.Create().ComputeHash(System.Text.Encoding.UTF8.GetBytes(payload));
            var fingerprint = Convert.ToBase64String(hash);
            return fingerprint;
        }
        private static string GetResource(Job job)
        {
            return GetFingerprint(job);
        }
    }