Merge pull request #50 from danielgerlag/read-ahead

Author: danielgerlag

ReleaseNotes/1.3.0.md

@@ -0,0 +1,20 @@
+# Workflow Core 1.3.0
+
+* Added support for async steps
+
+Simply inherit from `StepBodyAsync` instead of `StepBody`
+
+```c#
+public class DoSomething : StepBodyAsync
+{
+    public override async Task<ExecutionResult> RunAsync(IStepExecutionContext context)
+    {
+        await Task.Delay(2000);
+        return ExecutionResult.Next();
+    }
+}
+```
+
+* Migrated from managing own thread pool to TPL datablocks for queue consumers
+
+* After executing a workflow, will determine if it is scheduled to run before the next poll, if so, will delay queue it

WorkflowCore.sln

@@ -1,7 +1,7 @@
 
 namespace WorkflowCore.Interface
 {
-    public interface IBackgroundWorker
+    public interface IBackgroundTask
     {
         void Start();
         void Stop();

src/WorkflowCore/Interface/IBackgroundWorker.cs renamed to src/WorkflowCore/Interface/IBackgroundTask.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace WorkflowCore.Interface
+{
+    public interface IDateTimeProvider
+    {
+        DateTime Now { get; }
+    }
+}

src/WorkflowCore/Interface/IDateTimeProvider.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Threading;
 using System.Threading.Tasks;
 
 namespace WorkflowCore.Interface
@@ -11,7 +12,7 @@ namespace WorkflowCore.Interface
     /// </remarks>
     public interface IDistributedLockProvider
     {
-        Task<bool> AcquireLock(string Id);
+        Task<bool> AcquireLock(string Id, CancellationToken cancellationToken);
 
         Task ReleaseLock(string Id);
 

src/WorkflowCore/Interface/IDistributedLockProvider.cs

@@ -16,7 +16,7 @@ public interface IPersistenceProvider
 
         Task PersistWorkflow(WorkflowInstance workflow);
 
-        Task<IEnumerable<string>> GetRunnableInstances();
+        Task<IEnumerable<string>> GetRunnableInstances(DateTime asAt);
 
         Task<IEnumerable<WorkflowInstance>> GetWorkflowInstances(WorkflowStatus? status, string type, DateTime? createdFrom, DateTime? createdTo, int skip, int take);
 
@@ -32,7 +32,7 @@ public interface IPersistenceProvider
 
         Task<Event> GetEvent(string id);
 
-        Task<IEnumerable<string>> GetRunnableEvents();
+        Task<IEnumerable<string>> GetRunnableEvents(DateTime asAt);
 
         Task<IEnumerable<string>> GetEvents(string eventName, string eventKey, DateTime asOf);
 

src/WorkflowCore/Interface/IEventThread.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Threading;
 using System.Threading.Tasks;
 using WorkflowCore.Models;
 
@@ -25,7 +26,9 @@ public interface IQueueProvider : IDisposable
         /// If the queue is empty, NULL is returned
         /// </summary>
         /// <returns></returns>
-        Task<string> DequeueWork(QueueType queue);                
+        Task<string> DequeueWork(QueueType queue, CancellationToken cancellationToken);
+
+        bool IsDequeueBlocking { get; }
 
         Task Start();
         Task Stop();

src/WorkflowCore/Interface/IPersistenceProvider.cs

@@ -8,6 +8,6 @@ namespace WorkflowCore.Interface
 {
     public interface IStepBody
     {        
-        ExecutionResult Run(IStepExecutionContext context);
+        Task<ExecutionResult> RunAsync(IStepExecutionContext context);
     }
 }