Expose fromWorkflowStub (#2311)

temporal-sdk/src/main/java/io/temporal/nexus/WorkflowHandle.java

@@ -266,9 +266,9 @@ public static <A1, A2, A3, A4, A5, A6, R> WorkflowHandle<R> fromWorkflowMethod(
    * @param args arguments to start the workflow
    * @return WorkflowHandle
    */
-  static <R> WorkflowHandle<R> fromWorkflowStub(
+  public static <R> WorkflowHandle<R> fromWorkflowStub(
       WorkflowStub stub, Class<R> resultClass, Object... args) {
-    return new WorkflowHandle(new WorkflowStubHandleInvoker(stub, args));
+    return new WorkflowHandle<>(new WorkflowStubHandleInvoker(stub, args));
   }
 
   final WorkflowHandleInvoker invoker;

temporal-sdk/src/test/java/io/temporal/workflow/nexus/WorkflowHandleStubTest.java

@@ -0,0 +1,160 @@
+/*
+ * Copyright (C) 2022 Temporal Technologies, Inc. All Rights Reserved.
+ *
+ * Copyright (C) 2012-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Modifications copyright (C) 2017 Uber Technologies, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this material except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.temporal.workflow.nexus;
+
+import io.nexusrpc.Operation;
+import io.nexusrpc.Service;
+import io.nexusrpc.handler.OperationHandler;
+import io.nexusrpc.handler.OperationImpl;
+import io.nexusrpc.handler.ServiceImpl;
+import io.temporal.client.WorkflowOptions;
+import io.temporal.nexus.WorkflowClientOperationHandlers;
+import io.temporal.nexus.WorkflowHandle;
+import io.temporal.testing.internal.SDKTestWorkflowRule;
+import io.temporal.workflow.NexusOperationOptions;
+import io.temporal.workflow.NexusServiceOptions;
+import io.temporal.workflow.Workflow;
+import io.temporal.workflow.shared.TestMultiArgWorkflowFunctions;
+import io.temporal.workflow.shared.TestWorkflows;
+import java.time.Duration;
+import org.junit.Assert;
+import org.junit.Rule;
+import org.junit.Test;
+
+public class WorkflowHandleStubTest {
+  @Rule
+  public SDKTestWorkflowRule testWorkflowRule =
+      SDKTestWorkflowRule.newBuilder()
+          .setWorkflowTypes(
+              TestNexus.class, TestMultiArgWorkflowFunctions.TestMultiArgWorkflowImpl.class)
+          .setNexusServiceImplementation(new TestNexusServiceFuncImpl())
+          .build();
+
+  @Test
+  public void stubTests() {
+    TestWorkflows.TestWorkflow1 workflowStub =
+        testWorkflowRule.newWorkflowStubTimeoutOptions(TestWorkflows.TestWorkflow1.class);
+    String result = workflowStub.execute(testWorkflowRule.getTaskQueue());
+    Assert.assertEquals("success", result);
+  }
+
+  public static class TestNexus implements TestWorkflows.TestWorkflow1 {
+    @Override
+    public String execute(String input) {
+      NexusOperationOptions options =
+          NexusOperationOptions.newBuilder()
+              .setScheduleToCloseTimeout(Duration.ofSeconds(10))
+              .build();
+      NexusServiceOptions serviceOptions =
+          NexusServiceOptions.newBuilder().setOperationOptions(options).build();
+
+      TestNexusServiceProc serviceStub =
+          Workflow.newNexusServiceStub(TestNexusServiceProc.class, serviceOptions);
+      for (int i = 0; i < 7; i++) {
+        serviceStub.operation(i);
+      }
+      return "success";
+    }
+  }
+
+  @Service
+  public interface TestNexusServiceProc {
+    @Operation
+    Void operation(Integer input);
+  }
+
+  @ServiceImpl(service = TestNexusServiceProc.class)
+  public class TestNexusServiceFuncImpl {
+    @OperationImpl
+    public OperationHandler<Integer, Void> operation() {
+      return WorkflowClientOperationHandlers.fromWorkflowHandle(
+          (context, details, client, input) -> {
+            switch (input) {
+              case 0:
+                return WorkflowHandle.fromWorkflowStub(
+                    client.newUntypedWorkflowStub(
+                        "TestNoArgsWorkflowProc",
+                        WorkflowOptions.newBuilder().setWorkflowId(details.getRequestId()).build()),
+                    Void.class);
+              case 1:
+                return WorkflowHandle.fromWorkflowStub(
+                    client.newUntypedWorkflowStub(
+                        "Test1ArgWorkflowProc",
+                        WorkflowOptions.newBuilder().setWorkflowId(details.getRequestId()).build()),
+                    Void.class,
+                    "input");
+              case 2:
+                return WorkflowHandle.fromWorkflowStub(
+                    client.newUntypedWorkflowStub(
+                        "Test2ArgWorkflowProc",
+                        WorkflowOptions.newBuilder().setWorkflowId(details.getRequestId()).build()),
+                    Void.class,
+                    "input",
+                    2);
+              case 3:
+                return WorkflowHandle.fromWorkflowStub(
+                    client.newUntypedWorkflowStub(
+                        "Test3ArgWorkflowProc",
+                        WorkflowOptions.newBuilder().setWorkflowId(details.getRequestId()).build()),
+                    Void.class,
+                    "input",
+                    2,
+                    3);
+              case 4:
+                return WorkflowHandle.fromWorkflowStub(
+                    client.newUntypedWorkflowStub(
+                        "Test4ArgWorkflowProc",
+                        WorkflowOptions.newBuilder().setWorkflowId(details.getRequestId()).build()),
+                    Void.class,
+                    "input",
+                    2,
+                    3,
+                    4);
+              case 5:
+                return WorkflowHandle.fromWorkflowStub(
+                    client.newUntypedWorkflowStub(
+                        "Test5ArgWorkflowProc",
+                        WorkflowOptions.newBuilder().setWorkflowId(details.getRequestId()).build()),
+                    Void.class,
+                    "input",
+                    2,
+                    3,
+                    4,
+                    5);
+              case 6:
+                return WorkflowHandle.fromWorkflowStub(
+                    client.newUntypedWorkflowStub(
+                        "Test6ArgWorkflowProc",
+                        WorkflowOptions.newBuilder().setWorkflowId(details.getRequestId()).build()),
+                    Void.class,
+                    "input",
+                    2,
+                    3,
+                    4,
+                    5,
+                    6);
+              default:
+                return null;
+            }
+          });
+    }
+  }
+}