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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| namespace TemporalioSamples.Mutex; | ||
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| using Temporalio.Activities; | ||
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| public record NotifyLockedInput(string ResourceId, string ReleaseSignalName); | ||
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| public record UseApiThatCantBeCalledInParallelInput(TimeSpan SleepFor); | ||
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| public record NotifyUnlockedInput(string ResourceId); | ||
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| public static class Activities | ||
| { | ||
| [Activity] | ||
| public static void NotifyLocked(NotifyLockedInput input) | ||
| { | ||
| ActivityExecutionContext.Current.Logger.LogInformation( | ||
| "Lock for resource '{ResourceId}' acquired, release signal name '{ReleaseSignalName}'", input.ResourceId, input.ReleaseSignalName); | ||
| } | ||
|
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| [Activity] | ||
| public static async Task UseApiThatCantBeCalledInParallelAsync(UseApiThatCantBeCalledInParallelInput input) | ||
| { | ||
| var logger = ActivityExecutionContext.Current.Logger; | ||
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| logger.LogInformation("Sleeping for '{SleepFor}'...", input.SleepFor); | ||
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| await Task.Delay(input.SleepFor); | ||
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| logger.LogInformation("Done sleeping!"); | ||
| } | ||
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| [Activity] | ||
| public static void NotifyUnlocked(NotifyUnlockedInput input) | ||
| { | ||
| ActivityExecutionContext.Current.Logger.LogInformation( | ||
| "Lock for resource '{ResourceId}' released", input.ResourceId); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| namespace TemporalioSamples.Mutex.Impl; | ||
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| public interface ILockHandle : IAsyncDisposable | ||
| { | ||
| public string LockInitiatorId { get; } | ||
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| public string ResourceId { get; } | ||
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| public string ReleaseSignalName { get; } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| namespace TemporalioSamples.Mutex.Impl; | ||
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| internal interface ILockHandler | ||
| { | ||
| public string? CurrentOwnerId { get; } | ||
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| public Task HandleAsync(LockRequest lockRequest); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| namespace TemporalioSamples.Mutex.Impl; | ||
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| internal record LockRequest(string InitiatorId, string AcquireLockSignalName, TimeSpan? Timeout = null); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| namespace TemporalioSamples.Mutex.Impl; | ||
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| using Temporalio.Activities; | ||
| using Temporalio.Client; | ||
| using Temporalio.Workflows; | ||
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| internal record SignalWithStartMutexWorkflowInput(string MutexWorkflowId, string ResourceId, string AcquireLockSignalName, TimeSpan? LockTimeout = null); | ||
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| internal class MutexActivities | ||
| { | ||
| private static readonly string RequestLockSignalName = | ||
| WorkflowSignalDefinition.FromMethod( | ||
| typeof(MutexWorkflow).GetMethod(nameof(MutexWorkflow.RequestLockAsync)) | ||
| ?? throw new InvalidOperationException($"Method {nameof(MutexWorkflow.RequestLockAsync)} not found on type {typeof(MutexWorkflow)}")) | ||
| .Name ?? throw new InvalidOperationException("Signal name is null."); | ||
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| private readonly ITemporalClient client; | ||
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| public MutexActivities(ITemporalClient client) | ||
| { | ||
| this.client = client; | ||
| } | ||
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| [Activity] | ||
| public async Task SignalWithStartMutexWorkflowAsync(SignalWithStartMutexWorkflowInput input) | ||
| { | ||
| var activityInfo = ActivityExecutionContext.Current.Info; | ||
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| await this.client.StartWorkflowAsync( | ||
| (MutexWorkflow mw) => mw.RunAsync(MutexWorkflowInput.Empty), | ||
| new WorkflowOptions(input.MutexWorkflowId, activityInfo.TaskQueue) | ||
| { | ||
| StartSignal = RequestLockSignalName, | ||
| StartSignalArgs = new object[] { new LockRequest(activityInfo.WorkflowId, input.AcquireLockSignalName, input.LockTimeout), }, | ||
| }); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| namespace TemporalioSamples.Mutex.Impl; | ||
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| using Temporalio.Workflows; | ||
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| internal record MutexWorkflowInput(IReadOnlyCollection<LockRequest> InitialRequests) | ||
| { | ||
| public static readonly MutexWorkflowInput Empty = new(Array.Empty<LockRequest>()); | ||
| } | ||
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| [Workflow] | ||
| internal class MutexWorkflow | ||
| { | ||
| private readonly ILockHandler lockHandler = WorkflowMutex.CreateLockHandler(); | ||
| private readonly Queue<LockRequest> requests = new(); | ||
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| [WorkflowRun] | ||
| public async Task RunAsync(MutexWorkflowInput input) | ||
| { | ||
| var logger = Workflow.Logger; | ||
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| foreach (var request in input.InitialRequests) | ||
| { | ||
| requests.Enqueue(request); | ||
| } | ||
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| while (!Workflow.ContinueAsNewSuggested) | ||
| { | ||
| if (requests.Count == 0) | ||
| { | ||
| logger.LogInformation("No lock requests, waiting for more..."); | ||
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| await Workflow.WaitConditionAsync(() => requests.Count > 0); | ||
| } | ||
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| while (requests.TryDequeue(out var lockRequest)) | ||
| { | ||
| await lockHandler.HandleAsync(lockRequest); | ||
| } | ||
| } | ||
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| if (requests.Count > 0) | ||
| { | ||
| var newInput = new MutexWorkflowInput(requests); | ||
| throw Workflow.CreateContinueAsNewException((MutexWorkflow x) => x.RunAsync(newInput)); | ||
| } | ||
| } | ||
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| [WorkflowQuery] | ||
| public string? CurrentOwnerId => lockHandler.CurrentOwnerId; | ||
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| [WorkflowSignal] | ||
| public Task RequestLockAsync(LockRequest request) | ||
| { | ||
| requests.Enqueue(request); | ||
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| Workflow.Logger.LogInformation("Received lock request. (InitiatorId='{InitiatorId}')", request.InitiatorId); | ||
|
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| return Task.CompletedTask; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| namespace TemporalioSamples.Mutex.Impl; | ||
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| using Temporalio.Client; | ||
| using Temporalio.Worker; | ||
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| public static class TemporalWorkerOptionsExtensions | ||
| { | ||
| public static TemporalWorkerOptions AddWorkflowMutex(this TemporalWorkerOptions options, ITemporalClient client) | ||
| { | ||
| var mutexActivities = new MutexActivities(client); | ||
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| options | ||
| .AddAllActivities(mutexActivities) | ||
| .AddWorkflow<MutexWorkflow>(); | ||
|
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| return options; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| namespace TemporalioSamples.Mutex.Impl; | ||
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| using Temporalio.Workflows; | ||
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| internal record AcquireLockInput(string ReleaseSignalName); | ||
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| /// <summary> | ||
| /// Represents a mutual exclusion mechanism for Workflows. | ||
| /// This part contains API for acquiring locks. | ||
| /// </summary> | ||
| public static class WorkflowMutex | ||
| { | ||
| private const string MutexWorkflowIdPrefix = "__wm-lock:"; | ||
|
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| public static async Task<ILockHandle> LockAsync(string resourceId, TimeSpan? lockTimeout = null) | ||
| { | ||
| if (!Workflow.InWorkflow) | ||
| { | ||
| throw new InvalidOperationException("Cannot acquire a lock outside of a workflow."); | ||
| } | ||
|
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| var initiatorId = Workflow.Info.WorkflowId; | ||
| var lockStarted = Workflow.UtcNow; | ||
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| string? releaseSignalName = null; | ||
| var acquireLockSignalName = Workflow.NewGuid().ToString(); | ||
| var signalDefinition = WorkflowSignalDefinition.CreateWithoutAttribute(acquireLockSignalName, (AcquireLockInput input) => | ||
| { | ||
| releaseSignalName = input.ReleaseSignalName; | ||
|
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| return Task.CompletedTask; | ||
| }); | ||
| Workflow.Signals[acquireLockSignalName] = signalDefinition; | ||
| try | ||
| { | ||
| var startMutexWorkflowInput = new SignalWithStartMutexWorkflowInput($"{MutexWorkflowIdPrefix}{resourceId}", resourceId, acquireLockSignalName, lockTimeout); | ||
| await Workflow.ExecuteActivityAsync<MutexActivities>( | ||
| act => act.SignalWithStartMutexWorkflowAsync(startMutexWorkflowInput), | ||
| new ActivityOptions { StartToCloseTimeout = TimeSpan.FromMinutes(1), }); | ||
|
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| await Workflow.WaitConditionAsync(() => releaseSignalName != null); | ||
|
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| var elapsed = Workflow.UtcNow - lockStarted; | ||
| Workflow.Logger.LogInformation( | ||
| "Lock for resource '{ResourceId}' acquired in {AcquireTime}ms by '{LockInitiatorId}', release signal name '{ReleaseSignalName}'", | ||
| resourceId, | ||
| (int)elapsed.TotalMilliseconds, | ||
| initiatorId, | ||
| releaseSignalName); | ||
|
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| return new LockHandle(initiatorId, startMutexWorkflowInput.MutexWorkflowId, resourceId, releaseSignalName!); | ||
| } | ||
| finally | ||
| { | ||
| Workflow.Signals.Remove(acquireLockSignalName); | ||
| } | ||
| } | ||
|
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| internal static ILockHandler CreateLockHandler() | ||
| { | ||
| if (!Workflow.InWorkflow) | ||
| { | ||
| throw new InvalidOperationException("Cannot acquire a lock outside of a workflow."); | ||
| } | ||
|
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| return new LockHandler(); | ||
| } | ||
|
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| internal sealed class LockHandle : ILockHandle | ||
| { | ||
| private readonly string mutexWorkflowId; | ||
|
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| public LockHandle(string lockInitiatorId, string mutexWorkflowId, string resourceId, string releaseSignalId) | ||
| { | ||
| LockInitiatorId = lockInitiatorId; | ||
| this.mutexWorkflowId = mutexWorkflowId; | ||
| ResourceId = resourceId; | ||
| ReleaseSignalName = releaseSignalId; | ||
| } | ||
|
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| /// <inheritdoc /> | ||
| public string LockInitiatorId { get; } | ||
|
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| /// <inheritdoc /> | ||
| public string ResourceId { get; } | ||
|
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| /// <inheritdoc /> | ||
| public string ReleaseSignalName { get; } | ||
|
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| /// <inheritdoc /> | ||
| public async ValueTask DisposeAsync() | ||
| { | ||
| var mutexHandle = Workflow.GetExternalWorkflowHandle(mutexWorkflowId); | ||
| await mutexHandle.SignalAsync(ReleaseSignalName, Array.Empty<object?>()); | ||
| } | ||
| } | ||
|
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| internal sealed class LockHandler : ILockHandler | ||
| { | ||
| /// <inheritdoc /> | ||
| public string? CurrentOwnerId { get; private set; } | ||
|
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| /// <inheritdoc /> | ||
| public async Task HandleAsync(LockRequest lockRequest) | ||
| { | ||
| var releaseSignalName = Workflow.NewGuid().ToString(); | ||
|
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| var initiator = Workflow.GetExternalWorkflowHandle(lockRequest.InitiatorId); | ||
| await initiator.SignalAsync(lockRequest.AcquireLockSignalName, new[] { new AcquireLockInput(releaseSignalName) }); | ||
|
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| var released = false; | ||
| Workflow.Signals[releaseSignalName] = WorkflowSignalDefinition.CreateWithoutAttribute(releaseSignalName, () => | ||
| { | ||
| released = true; | ||
|
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| return Task.CompletedTask; | ||
| }); | ||
| CurrentOwnerId = lockRequest.InitiatorId; | ||
|
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| if (!await Workflow.WaitConditionAsync(() => released, lockRequest.Timeout ?? Timeout.InfiniteTimeSpan)) | ||
| { | ||
| Workflow.Logger.LogWarning( | ||
| "Lock for resource '{ResourceId}' has been timed out after '{Timeout}'. (LockInitiatorId='{LockInitiatorId}')", | ||
| Workflow.Info.WorkflowId[MutexWorkflowIdPrefix.Length..], | ||
| lockRequest.Timeout, | ||
| lockRequest.InitiatorId); | ||
| } | ||
|
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| CurrentOwnerId = null; | ||
| Workflow.Signals.Remove(releaseSignalName); | ||
| } | ||
| } | ||
| } |
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