docs: add new sample storage_configure_retries (#1152)

README.md

@@ -227,6 +227,7 @@ Samples are in the [`samples/`](https://github.com/googleapis/java-storage/tree/
 
 | Sample                      | Source Code                       | Try it |
 | --------------------------- | --------------------------------- | ------ |
+| Configure Retries | [source code](https://github.com/googleapis/java-storage/blob/main/samples/snippets/src/main/java/com/example/storage/ConfigureRetries.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-storage&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/storage/ConfigureRetries.java) |
 | Quickstart Sample | [source code](https://github.com/googleapis/java-storage/blob/main/samples/snippets/src/main/java/com/example/storage/QuickstartSample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-storage&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/storage/QuickstartSample.java) |
 
 

samples/snippets/src/main/java/com/example/storage/ConfigureRetries.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file 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 com.example.storage;
+// [START storage_configure_retries]
+
+import com.google.api.gax.retrying.RetrySettings;
+import com.google.cloud.storage.BlobId;
+import com.google.cloud.storage.Storage;
+import com.google.cloud.storage.StorageOptions;
+import com.google.cloud.storage.StorageRetryStrategy;
+import org.threeten.bp.Duration;
+
+public final class ConfigureRetries {
+  public static void main(String[] args) {
+    String bucketName = "my-bucket";
+    String blobName = "blob/to/delete";
+    deleteBlob(bucketName, blobName);
+  }
+
+  static void deleteBlob(String bucketName, String blobName) {
+    // Update the retry settings
+    RetrySettings retrySettings =
+        StorageOptions.getDefaultRetrySettings()
+            .toBuilder()
+            // to set the max number of attempts to 10
+            .setMaxAttempts(10)
+            // to set the backoff multiplier to 3.0
+            .setRetryDelayMultiplier(3.0)
+            // to set the max duration of all attempts to 5 minutes
+            .setTotalTimeout(Duration.ofMinutes(5))
+            .build();
+
+    StorageOptions alwaysRetryStorageOptions =
+        StorageOptions.newBuilder()
+            // Configure our options so all requests will be retried even if they are
+            // non-idempotent.
+            .setStorageRetryStrategy(StorageRetryStrategy.getUniformStorageRetryStrategy())
+            // provide the previously configured retrySettings
+            .setRetrySettings(retrySettings)
+            .build();
+
+    // Instantiate a client with our options
+    Storage storage = alwaysRetryStorageOptions.getService();
+
+    // Delete the blob
+    BlobId blobId = BlobId.of(bucketName, blobName);
+    boolean success = storage.delete(blobId);
+
+    System.out.printf(
+        "Deletion of Blob %s completed %s.%n", blobId, success ? "successfully" : "unsuccessfully");
+  }
+}
+// [END storage_configure_retries]

samples/snippets/src/test/java/com/example/storage/ConfigureRetriesTest.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file 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 com.example.storage;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.cloud.storage.Blob;
+import com.google.cloud.storage.BlobInfo;
+import com.google.cloud.storage.BucketInfo;
+import com.google.cloud.storage.Storage;
+import com.google.cloud.storage.StorageOptions;
+import com.google.cloud.storage.testing.RemoteStorageHelper;
+import com.google.cloud.testing.junit4.StdOutCaptureRule;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+
+public final class ConfigureRetriesTest {
+  @Rule public StdOutCaptureRule stdOut = new StdOutCaptureRule();
+
+  private String bucketName;
+  private Storage storage;
+  private String blobName;
+
+  private Blob blob;
+
+  @Before
+  public void setUp() {
+    blobName = "blob";
+    bucketName = RemoteStorageHelper.generateBucketName();
+    storage = StorageOptions.getDefaultInstance().getService();
+    storage.create(BucketInfo.of(bucketName));
+    blob = storage.create(BlobInfo.newBuilder(bucketName, blobName).build());
+  }
+
+  @After
+  public void tearDown() {
+    if (blob != null && blob.exists()) {
+      blob.delete();
+    }
+    storage.delete(bucketName);
+  }
+
+  @Test
+  public void testConfigureRetries() {
+    ConfigureRetries.deleteBlob(bucketName, blobName);
+    assertThat(stdOut.getCapturedOutputAsUtf8String()).contains("Deletion");
+    assertThat(stdOut.getCapturedOutputAsUtf8String()).contains("successfully");
+    assertThat(stdOut.getCapturedOutputAsUtf8String()).doesNotContain("unsuccessfully");
+  }
+}