implementing getIsReplaying() method for Authoring API (#7)

sdk-workflows/src/main/java/io/dapr/workflows/runtime/DaprWorkflowContextImpl.java

@@ -95,4 +95,9 @@ public void complete(Object output) {
   public Task<Void> waitForExternalEvent(String eventName, Duration timeout) {
     return this.innerContext.waitForExternalEvent(eventName, timeout);
   }
+
+  @Override
+  public boolean getIsReplaying() {
+    return this.innerContext.getIsReplaying();
+  }
 }

sdk-workflows/src/main/java/io/dapr/workflows/runtime/WorkflowContext.java

@@ -66,4 +66,21 @@ public interface WorkflowContext {
    * @return Asynchronous task to {@code await()}.
    */
   Task waitForExternalEvent(String eventName, Duration timeout);
+
+  /**
+   * Gets a value indicating whether the workflow is currently replaying a previous execution.
+   *
+   * <p>Workflow functions are "replayed" after being unloaded from memory to reconstruct local variable state.
+   * During a replay, previously executed tasks will be completed automatically with previously seen values
+   * that are stored in the workflow history. Once the workflow reaches the point where it's no longer
+   * replaying existing history, this method will return {@code false}.
+   *
+   * <p>You can use this method if you have logic that needs to run only when <em>not</em> replaying. For example,
+   * certain types of application logging may become too noisy when duplicated as part of replay. The
+   * application code could check to see whether the function is being replayed and then issue the log statements
+   * when this value is {@code false}.
+   *
+   * @return {@code true} if the workflow is replaying, otherwise {@code false}
+   */
+  boolean getIsReplaying();
 }

sdk-workflows/src/test/java/io/dapr/workflows/runtime/DaprWorkflowContextImplTest.java

@@ -65,10 +65,16 @@ public void completeTest() {
     verify(mockInnerContext, times(1)).complete(null);
   }
 
+  @Test
+  public void getIsReplaying() {
+    context.getIsReplaying();
+    verify(mockInnerContext, times(1)).getIsReplaying();
+  }
+
   @Test
   public void getLoggerReplayingTest() {
     Logger mockLogger = mock(Logger.class);
-    when(mockInnerContext.getIsReplaying()).thenReturn(true);
+    when(context.getIsReplaying()).thenReturn(true);
     DaprWorkflowContextImpl testContext = new DaprWorkflowContextImpl(mockInnerContext, mockLogger);
 
     String expectedArg = "test print";
@@ -80,7 +86,7 @@ public void getLoggerReplayingTest() {
   @Test
   public void getLoggerFirstTimeTest() {
     Logger mockLogger = mock(Logger.class);
-    when(mockInnerContext.getIsReplaying()).thenReturn(false);
+    when(context.getIsReplaying()).thenReturn(false);
     DaprWorkflowContextImpl testContext = new DaprWorkflowContextImpl(mockInnerContext, mockLogger);
 
     String expectedArg = "test print";