parallel exec output should be merged into one WorkflowModel (#848)

* parallel exec output should be merged into one WorkflowModel

Signed-off-by: Dmitrii Tikhomirov <chani.liet@gmail.com>

* better combined processsing

Signed-off-by: Dmitrii Tikhomirov <chani.liet@gmail.com>

* result can be AgenticScope and Map<String, Object>

Signed-off-by: Dmitrii Tikhomirov <chani.liet@gmail.com>

---------

Signed-off-by: Dmitrii Tikhomirov <chani.liet@gmail.com>

Author: treblereel

experimental/agentic/src/main/java/io/serverlessworkflow/impl/expressions/agentic/AgenticModelFactory.java

@@ -24,6 +24,7 @@
 import io.serverlessworkflow.impl.expressions.agentic.langchain4j.AgenticScopeRegistryAssessor;
 import java.time.OffsetDateTime;
 import java.util.Map;
+import java.util.stream.Collectors;
 
 class AgenticModelFactory implements WorkflowModelFactory {
 
@@ -60,10 +61,11 @@ public WorkflowModel fromAny(WorkflowModel prev, Object obj) {
 
   @Override
   public WorkflowModel combine(Map<String, WorkflowModel> workflowVariables) {
-    // TODO: create a new agenticScope object in the AgenticScopeRegistryAssessor per branch
-    // TODO: Since we share the same agenticScope object, both branches are updating the same
-    // instance, so for now we return the first key.
-    return workflowVariables.values().iterator().next();
+    Map<String, Object> combinedState =
+        workflowVariables.entrySet().stream()
+            .map(e -> Map.entry(e.getKey(), e.getValue().asJavaObject()))
+            .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+    return newAgenticModel(combinedState);
   }
 
   @Override

experimental/fluent/agentic/src/test/java/io/serverlessworkflow/fluent/agentic/WorkflowTests.java

@@ -174,6 +174,15 @@ public void testParallel() throws ExecutionException, InterruptedException {
     Map<String, String> topic = new HashMap<>();
     topic.put("style", "sci-fi");
 
+    try (WorkflowApplication app = WorkflowApplication.builder().build()) {
+      Map<String, Object> result =
+          app.workflowDefinition(workflow).instance(topic).start().get().asMap().orElseThrow();
+
+      assertEquals("Fake conflict response", result.get("setting").toString());
+      assertEquals("Fake hero response", result.get("hero").toString());
+      assertEquals("Fake setting response", result.get("conflict").toString());
+    }
+
     try (WorkflowApplication app = WorkflowApplication.builder().build()) {
       AgenticScope result =
           app.workflowDefinition(workflow)
@@ -183,9 +192,9 @@ public void testParallel() throws ExecutionException, InterruptedException {
               .as(AgenticScope.class)
               .orElseThrow();
 
-      assertEquals("Fake conflict response", result.readState("setting"));
-      assertEquals("Fake hero response", result.readState("hero"));
-      assertEquals("Fake setting response", result.readState("conflict"));
+      assertEquals("Fake conflict response", result.readState("setting").toString());
+      assertEquals("Fake hero response", result.readState("hero").toString());
+      assertEquals("Fake setting response", result.readState("conflict").toString());
     }
   }
 
@@ -223,6 +232,14 @@ public void testSeqAndThenParallel() throws ExecutionException, InterruptedExcep
     Map<String, String> topic = new HashMap<>();
     topic.put("fact", "alien");
 
+    try (WorkflowApplication app = WorkflowApplication.builder().build()) {
+      Map<String, Object> result =
+          app.workflowDefinition(workflow).instance(topic).start().get().asMap().orElseThrow();
+
+      assertEquals(cultureTraits, result.get("culture"));
+      assertEquals(technologyTraits, result.get("technology"));
+    }
+
     try (WorkflowApplication app = WorkflowApplication.builder().build()) {
       AgenticScope result =
           app.workflowDefinition(workflow)