samples: vision: address flakes due to collisions. (#1458)

* vision: address flakes due to collisions.

* beta: convert batch future to actually wait for output properly.

* explicit imports

* additional explicit import

Author: shollyman

vision/snippets/src/main/java/com/example/vision/AsyncBatchAnnotateImagesGcs.java

@@ -17,7 +17,7 @@
 package com.example.vision;
 
 // [START vision_async_batch_annotate_images_beta]
-import com.google.api.core.ApiFuture;
+import com.google.api.gax.longrunning.OperationFuture;
 import com.google.api.gax.paging.Page;
 import com.google.cloud.storage.Blob;
 import com.google.cloud.storage.Bucket;
@@ -26,17 +26,17 @@
 import com.google.cloud.storage.StorageOptions;
 import com.google.cloud.vision.v1p4beta1.AnnotateImageRequest;
 import com.google.cloud.vision.v1p4beta1.AsyncBatchAnnotateImagesRequest;
-import com.google.cloud.vision.v1p4beta1.BatchAnnotateImagesResponse.Builder;
+import com.google.cloud.vision.v1p4beta1.AsyncBatchAnnotateImagesResponse;
 import com.google.cloud.vision.v1p4beta1.BatchAnnotateImagesResponse;
+import com.google.cloud.vision.v1p4beta1.BatchAnnotateImagesResponse.Builder;
 import com.google.cloud.vision.v1p4beta1.Feature;
 import com.google.cloud.vision.v1p4beta1.Feature.Type;
 import com.google.cloud.vision.v1p4beta1.GcsDestination;
 import com.google.cloud.vision.v1p4beta1.Image;
 import com.google.cloud.vision.v1p4beta1.ImageAnnotatorClient;
 import com.google.cloud.vision.v1p4beta1.ImageSource;
+import com.google.cloud.vision.v1p4beta1.OperationMetadata;
 import com.google.cloud.vision.v1p4beta1.OutputConfig;
-
-import com.google.longrunning.Operation;
 import com.google.protobuf.util.JsonFormat;
 import java.util.ArrayList;
 import java.util.List;
@@ -51,7 +51,6 @@ public static void asyncBatchAnnotateImagesGcs(String gcsSourcePath, String gcsD
       throws Exception {
     // String gcsSourcePath = "gs://YOUR_BUCKET_ID/path_to_your_data";
     // String gcsDestinationPath = "gs://YOUR_BUCKET_ID/path_to_store_annotation";
-
     try (ImageAnnotatorClient client = ImageAnnotatorClient.create()) {
       List<AnnotateImageRequest> requests = new ArrayList<>();
 
@@ -87,13 +86,14 @@ public static void asyncBatchAnnotateImagesGcs(String gcsSourcePath, String gcsD
               .setOutputConfig(outputConfig)
               .build();
 
-      ApiFuture<Operation> future = client.asyncBatchAnnotateImagesCallable().futureCall(request);
-      // Wait for the request to finish. (The result is not used, since the API saves the result to
-      // the specified location on GCS.)
-      Operation response = future.get(180, TimeUnit.SECONDS);
 
+      OperationFuture<AsyncBatchAnnotateImagesResponse, OperationMetadata> response =
+              client.asyncBatchAnnotateImagesAsync(request);
       System.out.println("Waiting for the operation to finish.");
 
+      // we're not processing the response, since we'll be reading the output from GCS.
+      response.get(180, TimeUnit.SECONDS);
+
       // Once the request has completed and the output has been
       // written to GCS, we can list all the output files.
       Storage storage = StorageOptions.getDefaultInstance().getService();

vision/snippets/src/test/java/com/example/vision/DetectIT.java

@@ -21,6 +21,7 @@
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.PrintStream;
+import java.util.UUID;
 
 import org.junit.After;
 import org.junit.Before;
@@ -33,9 +34,9 @@
 @SuppressWarnings("checkstyle:abbreviationaswordinname")
 public class DetectIT {
   private static final String PROJECT_ID = System.getenv("GOOGLE_CLOUD_PROJECT");
-  // private static final String BUCKET = PROJECT_ID;
   private static final String BUCKET = "java-docs-samples-testing";
-  private static final String OUTPUT_PREFIX = "OCR_PDF_TEST_OUTPUT";
+  private static final String OUTPUT_BUCKET = PROJECT_ID;
+  private static final String OUTPUT_PREFIX = "OUTPUT_VISION_BETA_" +  UUID.randomUUID().toString();
   private ByteArrayOutputStream bout;
   private PrintStream out;
   private Detect app;
@@ -125,7 +126,7 @@ public void testAsyncBatchAnnotateImagesGcs() throws Exception {
     // Act
     AsyncBatchAnnotateImagesGcs.asyncBatchAnnotateImagesGcs(
         "gs://cloud-samples-data/vision/label/wakeupcat.jpg",
-        "gs://" + BUCKET + "/" + OUTPUT_PREFIX + "/");
+        "gs://" + OUTPUT_BUCKET + "/" + OUTPUT_PREFIX + "/");
 
     // Assert
     String got = bout.toString();