Add Complete activity for completing composite activities

src/modules/Elsa.Workflows.Core/Activities/Complete.cs

@@ -0,0 +1,46 @@
+using System.ComponentModel;
+using Elsa.Expressions.Models;
+using Elsa.Workflows.Core.Activities.Flowchart.Models;
+using Elsa.Workflows.Core.Attributes;
+using Elsa.Workflows.Core.Models;
+using Elsa.Workflows.Core.Signals;
+
+namespace Elsa.Workflows.Core.Activities;
+
+/// <summary>
+/// Signals the current composite activity to complete itself as a whole.
+/// </summary>
+[Activity("Elsa", "Primitives", "Signals the current composite activity to complete itself as a whole.")]
+public class Complete : Activity
+{
+    /// <inheritdoc />
+    public Complete(params string[] outcomes) : this(new Input<ICollection<string>>(outcomes))
+    {
+    }
+
+    /// <inheritdoc />
+    public Complete(Func<ExpressionExecutionContext, ICollection<string>> outcomes) : this(new Input<ICollection<string>>(outcomes))
+    {
+    }
+
+    /// <inheritdoc />
+    public Complete(Func<ExpressionExecutionContext, string> outcome) : this(context => new[] { outcome(context) })
+    {
+    }
+
+    /// <inheritdoc />
+    public Complete(Input<ICollection<string>> outcomes) => Outcomes = outcomes;
+
+    /// <summary>
+    /// The outcome or set of outcomes to complete this activity with.
+    /// </summary>
+    [Description("The outcome or set of outcomes to complete this activity with.")]
+    public Input<ICollection<string>> Outcomes { get; set; }
+
+    /// <inheritdoc />
+    protected override async ValueTask ExecuteAsync(ActivityExecutionContext context)
+    {
+        var outcomes = Outcomes.Get(context).ToArray();
+        await context.SendSignalAsync(new CompleteCompositeSignal(new Outcomes(outcomes)));
+    }
+}

src/modules/Elsa.Workflows.Core/Activities/Composite.cs

@@ -90,9 +90,9 @@ public abstract class Composite : ActivityBase
 /// <summary>
 /// Represents a composite activity that has a single <see cref="Root"/> activity and returns a result.
 /// </summary>
-public class Composite<T> : ActivityBase<T>
+public abstract class Composite<T> : ActivityBase<T>
 {
-    public Composite()
+    protected Composite()
     {
         OnSignalReceived<CompleteCompositeSignal>(OnCompleteCompositeSignal);
     }

src/samples/aspnet/Elsa.Samples.TelnyxIntegration/GetAge.cs

@@ -1,5 +1,6 @@
 using Elsa.Workflows.Core.Activities;
 using Elsa.Workflows.Core.Activities.Flowchart.Attributes;
+using Elsa.Workflows.Core.Models;
 
 namespace Elsa.Samples.TelnyxIntegration;
 
@@ -8,12 +9,21 @@ public class GetAge : Composite<int>
 {
     public GetAge()
     {
-        Root = new Inline(async context =>
+        var ageVariable = new Variable<int>();
+
+        Root = new Sequence
         {
-            var random = new Random();
-            var n = random.Next(2);
-            var outcome = n == 0 ? "Under 18" : "Over 18";
-            await CompleteAsync(context, outcome);
-        });
+            Variables = { ageVariable },
+            Activities =
+            {
+                From(() =>
+                {
+                    var random = new Random();
+                    return random.Next(36);
+                }, ageVariable),
+
+                new Complete(context => ageVariable.Get<int>(context) < 18 ? "Under 18" : "Over 18")
+            }
+        };
     }
 }