Merge pull request #590 from mclift/bugfix/reentry-transition-missing-function-in-dotgraph

Show state entry function in re-entry transition in dot graph

Author: mclift

src/Stateless/Graph/GraphStyleBase.cs

@@ -77,17 +77,11 @@ public virtual List<string> FormatAllTransitions(List<Transition> transitions)
                         line = FormatOneTransition(stay.SourceState.NodeName, stay.Trigger.UnderlyingTrigger.ToString(),
                             null, stay.SourceState.NodeName, stay.Guards.Select(x => x.Description));
                     }
-                    else if (stay.SourceState.EntryActions.Count == 0)
-                    {
-                        line = FormatOneTransition(stay.SourceState.NodeName, stay.Trigger.UnderlyingTrigger.ToString(),
-                            null, stay.SourceState.NodeName, stay.Guards.Select(x => x.Description));
-                    }
                     else
                     {
-                        // There are entry functions into the state, so call out that this transition
-                        // does invoke them (since normally a transition back into the same state doesn't)
                         line = FormatOneTransition(stay.SourceState.NodeName, stay.Trigger.UnderlyingTrigger.ToString(),
-                            stay.SourceState.EntryActions, stay.SourceState.NodeName, stay.Guards.Select(x => x.Description));
+                            stay.DestinationEntryActions.Select(x => x.Method.Description), 
+                            stay.SourceState.NodeName, stay.Guards.Select(x => x.Description));
                     }
                 }
                 else

src/Stateless/Graph/StateGraph.cs

@@ -141,6 +141,16 @@ void AddTransitions(StateMachineInfo machineInfo)
                         Transitions.Add(stay);
                         fromState.Leaving.Add(stay);
                         fromState.Arriving.Add(stay);
+
+                        // If the reentrant transition causes the state's entry action to be executed, this is shown
+                        // explicity in the state graph by adding it to the DestinationEntryActions list.
+                        if (stay.ExecuteEntryExitActions)
+                        {
+                            foreach (var action in stateInfo.EntryActions.Where(a => a.FromTrigger is null))
+                            {
+                                stay.DestinationEntryActions.Add(action);
+                            }
+                        }
                     }
                     else
                     {

test/Stateless.Tests/DotGraphFixture.cs

@@ -582,6 +582,65 @@ public void Initial_State_Not_Changed_After_Trigger_Fired()
             Assert.Equal(expected, dotGraph);
         }
 
+        [Fact]
+        public void Reentrant_Transition_Shows_Entry_Action_When_Action_Is_Configured_With_OnEntryFrom()
+        {
+            var expected = Prefix(Style.UML)
+                + Box(Style.UML, "A")
+                + Box(Style.UML, "B")
+                + Line("A", "B", "X / OnEntry")
+                + Line("B", "B", "X / OnEntry")
+                + suffix;
+
+            var sm = new StateMachine<State, Trigger>(State.A);
+
+            sm.Configure(State.A)
+                .Permit(Trigger.X, State.B);
+
+            var list = new List<string>();
+            sm.Configure(State.B)
+                .OnEntryFrom(Trigger.X, OnEntry, entryActionDescription: "OnEntry")
+                .PermitReentry(Trigger.X);
+
+            string dotGraph = UmlDotGraph.Format(sm.GetInfo());
+
+#if WRITE_DOTS_TO_FOLDER
+            System.IO.File.WriteAllText(DestinationFolder + "Reentrant_Transition_Shows_Entry_Action_When_Action_Is_Configured_With_OnEntryFrom.dot", dotGraph);
+#endif
+
+            Assert.Equal(expected, dotGraph);
+        }
+
+        [Fact]
+        public void Reentrant_Transition_Shows_Entry_Action_When_Action_Is_Configured_With_OnEntryFrom_And_Trigger_Has_Parameter()
+        {
+            var expected = Prefix(Style.UML)
+                + Box(Style.UML, "A")
+                + Box(Style.UML, "B")
+                + Line("A", "B", "X / LogTrigger")
+                + Line("B", "B", "X / LogTrigger")
+                + suffix;
+
+            var sm = new StateMachine<State, Trigger>(State.A);
+            var triggerX = sm.SetTriggerParameters<string>(Trigger.X);
+
+            sm.Configure(State.A)
+                .Permit(Trigger.X, State.B);
+
+            var list = new List<string>();
+            sm.Configure(State.B)
+                .OnEntryFrom(triggerX, list.Add, entryActionDescription: "LogTrigger")
+                .PermitReentry(Trigger.X);
+
+            string dotGraph = UmlDotGraph.Format(sm.GetInfo());
+
+#if WRITE_DOTS_TO_FOLDER
+            System.IO.File.WriteAllText(DestinationFolder + "Reentrant_Transition_Shows_Entry_Action_When_Action_Is_Configured_With_OnEntryFrom_And_Trigger_Has_Parameter.dot", dotGraph);
+#endif
+
+            Assert.Equal(expected, dotGraph);
+        }
+
         private void TestEntryAction() { }
         private void TestEntryActionString(string val) { }
         private State DestinationSelector() { return State.A; }