Added replayer test for continue as new

src/test/java/com/uber/cadence/samples/replaytests/HelloActivityReplayTest.java

@@ -18,7 +18,6 @@
 package com.uber.cadence.samples.replaytests;
 
 import com.uber.cadence.samples.hello.HelloActivity;
-import com.uber.cadence.samples.hello.HelloPeriodic;
 import com.uber.cadence.testing.WorkflowReplayer;
 import org.junit.Test;
 
@@ -38,11 +37,4 @@ public void testReplay() throws Exception {
     WorkflowReplayer.replayWorkflowExecutionFromResource(
         "replaytests/HelloActivity.json", HelloActivity.GreetingWorkflowImpl.class);
   }
-
-  // continue-as-new case for replayer tests
-  @Test
-  public void testReplay_continueAsNew() throws Exception {
-    WorkflowReplayer.replayWorkflowExecutionFromResource(
-        "replaytests/HelloPeriodic.json", HelloPeriodic.GreetingWorkflowImpl.class);
-  }
 }

src/test/java/com/uber/cadence/samples/replaytests/HelloPeriodicReplayTest.java

@@ -0,0 +1,41 @@
+/*
+ *  Copyright 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 file except in compliance with the License. A copy of the License is
+ *  located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ *  or in the "license" file accompanying this file. This file 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 com.uber.cadence.samples.replaytests;
+
+import com.uber.cadence.samples.hello.HelloPeriodic;
+import com.uber.cadence.testing.WorkflowReplayer;
+import org.junit.Test;
+
+public class HelloPeriodicReplayTest {
+
+  // continue-as-new case for replayer tests: Passing
+  @Test
+  public void testReplay_continueAsNew() throws Exception {
+    WorkflowReplayer.replayWorkflowExecutionFromResource(
+        "replaytests/HelloPeriodic.json", HelloPeriodic.GreetingWorkflowImpl.class);
+  }
+
+  // Continue as new case: change in sleep timer compared to original workflow definition. It should
+  // fail. BUT it is currently passing.
+  @Test
+  public void testReplay_continueAsNew_timerChange() throws Exception {
+    WorkflowReplayer.replayWorkflowExecutionFromResource(
+        "replaytests/HelloPeriodic.json",
+        HelloPeriodic_sleepTimerChange.GreetingWorkflowImpl.class);
+  }
+}

src/test/java/com/uber/cadence/samples/replaytests/HelloPeriodic_sleepTimerChange.java

@@ -0,0 +1,158 @@
+/*
+ *  Copyright 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 file except in compliance with the License. A copy of the License is
+ *  located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ *  or in the "license" file accompanying this file. This file 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 com.uber.cadence.samples.replaytests;
+
+import static com.uber.cadence.samples.common.SampleConstants.DOMAIN;
+
+import com.google.common.base.Throwables;
+import com.uber.cadence.WorkflowExecution;
+import com.uber.cadence.WorkflowIdReusePolicy;
+import com.uber.cadence.activity.Activity;
+import com.uber.cadence.activity.ActivityOptions;
+import com.uber.cadence.client.DuplicateWorkflowException;
+import com.uber.cadence.client.WorkflowClient;
+import com.uber.cadence.client.WorkflowClientOptions;
+import com.uber.cadence.client.WorkflowException;
+import com.uber.cadence.client.WorkflowStub;
+import com.uber.cadence.internal.compatibility.Thrift2ProtoAdapter;
+import com.uber.cadence.internal.compatibility.proto.serviceclient.IGrpcServiceStubs;
+import com.uber.cadence.worker.Worker;
+import com.uber.cadence.worker.WorkerFactory;
+import com.uber.cadence.workflow.Workflow;
+import com.uber.cadence.workflow.WorkflowMethod;
+import java.time.Duration;
+import java.util.Optional;
+
+public class HelloPeriodic_sleepTimerChange {
+
+  static final String TASK_LIST = "HelloPeriodic";
+  static final String PERIODIC_WORKFLOW_ID = "HelloPeriodic";
+
+  public interface GreetingWorkflow {
+    @WorkflowMethod(
+      // At most one instance.
+      workflowId = PERIODIC_WORKFLOW_ID,
+      // To allow starting workflow with the same ID after the previous one has terminated.
+      workflowIdReusePolicy = WorkflowIdReusePolicy.AllowDuplicate,
+      // Adjust this value to the maximum time workflow is expected to run.
+      // It usually depends on the number of repetitions and interval between them.
+      executionStartToCloseTimeoutSeconds = 300,
+      taskList = TASK_LIST
+    )
+    void greetPeriodically(String name, Duration delay);
+  }
+
+  public interface GreetingActivities {
+    void greet(String greeting);
+  }
+
+  public static class GreetingWorkflowImpl implements GreetingWorkflow {
+
+    /**
+     * This value is so low just to make the example interesting to watch. In real life you would
+     * use something like 100 or a value that matches a business cycle. For example if it runs once
+     * an hour 24 would make sense.
+     */
+    private final int CONTINUE_AS_NEW_FREQUENCEY = 1000;
+
+    private final GreetingActivities activities =
+        Workflow.newActivityStub(
+            GreetingActivities.class,
+            new ActivityOptions.Builder()
+                .setScheduleToCloseTimeout(Duration.ofSeconds(10))
+                .build());
+
+    /**
+     * Stub used to terminate this workflow run and create the next one with the same ID atomically.
+     */
+    private final GreetingWorkflow continueAsNew =
+        Workflow.newContinueAsNewStub(GreetingWorkflow.class);
+
+    @Override
+    public void greetPeriodically(String name, Duration delay) {
+      // Loop the predefined number of times then continue this workflow as new.
+      // This is needed to periodically truncate the history size.
+      for (int i = 0; i < CONTINUE_AS_NEW_FREQUENCEY; i++) {
+        activities.greet("Hello " + name + "!");
+        Workflow.sleep(delay);
+      }
+      // Current workflow run stops executing after this call.
+      continueAsNew.greetPeriodically(name, delay);
+      // unreachable line
+    }
+  }
+
+  static class GreetingActivitiesImpl implements GreetingActivities {
+    @Override
+    public void greet(String greeting) {
+      System.out.println("From " + Activity.getWorkflowExecution() + ": " + greeting);
+    }
+  }
+
+  public static void main(String[] args) throws InterruptedException {
+    // Get a new client
+    // NOTE: to set a different options, you can do like this:
+    // ClientOptions.newBuilder().setRpcTimeout(5 * 1000).build();
+    WorkflowClient workflowClient =
+        WorkflowClient.newInstance(
+            new Thrift2ProtoAdapter(IGrpcServiceStubs.newInstance()),
+            WorkflowClientOptions.newBuilder().setDomain(DOMAIN).build());
+    // Get worker to poll the task list.
+    WorkerFactory factory = WorkerFactory.newInstance(workflowClient);
+    Worker worker = factory.newWorker(TASK_LIST);
+    // Workflows are stateful. So you need a type to create instances.
+    worker.registerWorkflowImplementationTypes(GreetingWorkflowImpl.class);
+    // Activities are stateless and thread safe. So a shared instance is used.
+    worker.registerActivitiesImplementations(new GreetingActivitiesImpl());
+    // Start listening to the workflow and activity task lists.
+    factory.start();
+
+    // Start a workflow execution. Usually this is done from another program.
+    // To ensure that this daemon type workflow is always running try to start it periodically
+    // ignoring the duplicated exception.
+    // It is only to protect from application level failures.
+    // Failures of a workflow worker don't lead to workflow failures.
+    WorkflowExecution execution = null;
+    while (true) {
+      // Print reason of failure of the previous run, before restarting.
+      if (execution != null) {
+        WorkflowStub workflow = workflowClient.newUntypedWorkflowStub(execution, Optional.empty());
+        try {
+          workflow.getResult(Void.class); //
+        } catch (WorkflowException e) {
+          System.out.println("Previous instance failed:\n" + Throwables.getStackTraceAsString(e));
+        }
+      }
+      // New stub instance should be created for each new workflow start.
+      GreetingWorkflow workflow = workflowClient.newWorkflowStub(GreetingWorkflow.class);
+      try {
+        execution =
+            WorkflowClient.start(workflow::greetPeriodically, "World", Duration.ofSeconds(3));
+        System.out.println("Started " + execution);
+      } catch (DuplicateWorkflowException e) {
+        System.out.println("Still running as " + e.getExecution());
+      } catch (Throwable e) {
+        e.printStackTrace();
+        System.exit(1);
+      }
+      // This value is so low just for the sample purpose. In production workflow
+      // it is usually much higher.
+      Thread.sleep(10000);
+    }
+  }
+}