docs(sample): Add Native Image sample for Storage

README.md

@@ -227,6 +227,7 @@ Samples are in the [`samples/`](https://github.com/googleapis/java-storage/tree/
 
 | Sample                      | Source Code                       | Try it |
 | --------------------------- | --------------------------------- | ------ |
+| Native Image Storage Sample | [source code](https://github.com/googleapis/java-storage/blob/main/samples/native-image-sample/src/main/java/com/example/storage/NativeImageStorageSample.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/native-image-sample/src/main/java/com/example/storage/NativeImageStorageSample.java) |
 | 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) |
 | Add Bucket Default Owner | [source code](https://github.com/googleapis/java-storage/blob/main/samples/snippets/src/main/java/com/example/storage/bucket/AddBucketDefaultOwner.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/bucket/AddBucketDefaultOwner.java) |

samples/native-image-sample/README.md

@@ -0,0 +1,80 @@
+# Storage Sample Application with Native Image
+
+The Storage sample application demonstrates some common operations with Google Cloud Storage and is compatible with Native Image compilation.
+
+## Setup Instructions
+
+You will need to follow these prerequisite steps in order to run these samples:
+
+1. If you have not already, [create a Google Cloud Platform Project](https://cloud.google.com/resource-manager/docs/creating-managing-projects#creating_a_project).
+
+2. Install the [Google Cloud SDK](https://cloud.google.com/sdk/) which will allow you to run the sample with your project's credentials.
+
+   Once installed, log in with Application Default Credentials using the following command:
+
+    ```
+    gcloud auth application-default login
+    ```
+
+   **Note:** Authenticating with Application Default Credentials is convenient to use during development, but we recommend [alternate methods of authentication](https://cloud.google.com/docs/authentication/production) during production use.
+
+3. Install the GraalVM compiler.
+
+   You can follow the [official installation instructions](https://www.graalvm.org/docs/getting-started/#install-graalvm) from the GraalVM website.
+   After following the instructions, ensure that you install the Native Image extension installed by running:
+
+    ```
+    gu install native-image
+    ```
+
+   Once you finish following the instructions, verify that the default version of Java is set to the GraalVM version by running `java -version` in a terminal.
+
+   You will see something similar to the below output:
+
+    ```
+    $ java -version
+
+    openjdk version "11.0.7" 2020-04-14
+    OpenJDK Runtime Environment GraalVM CE 20.1.0 (build 11.0.7+10-jvmci-20.1-b02)
+    OpenJDK 64-Bit Server VM GraalVM CE 20.1.0 (build 11.0.7+10-jvmci-20.1-b02, mixed mode, sharing)
+    ```
+
+4. [Enable the Cloud Storage APIs](https://console.cloud.google.com/apis/api/storage.googleapis.com).
+
+### Run with Native Image Compilation
+
+Navigate to this directory in a new terminal.
+
+1. Compile the application using the Native Image Compiler. This step may take a few minutes.
+
+    ```
+    mvn package -P native -DskipTests
+    ```
+
+2. Run the application:
+
+    ```
+    ./target/native-image-sample
+    ```
+
+3. The application will run through basic Cloud Storage operations of creating, reading, and deleting Cloud Storage resources.
+
+   You can manually manage Cloud Storage resources through [Google Cloud Console](https://console.cloud.google.com/storage) to verify that the resources are cleaned up.
+
+    ```
+    Creating bucket nativeimage-sample-bucket-7221f161-688c-4a7a-9120-8900d20f0802
+    Write file to bucket.
+    Reading the file that was written...
+    Successfully wrote to file: Hello World!
+    Cleaning up resources...
+    Deleted file nativeimage-sample-file-5d927aaf-cb03-41de-8383-696733893db5
+    Deleted bucket nativeimage-sample-bucket-7221f161-688c-4a7a-9120-8900d20f0802
+   ```
+
+## Sample Integration test with Native Image Support
+
+In order to run the sample integration test as a native image, call the following command:
+
+   ```
+   mvn test -Pnative
+   ```

samples/native-image-sample/pom.xml

@@ -0,0 +1,173 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.google.cloud</groupId>
+  <artifactId>native-image-sample</artifactId>
+  <name>Native Image Sample</name>
+  <url>https://github.com/googleapis/java-storage</url>
+
+  <!--
+    The parent pom defines common style checks and testing strategies for our samples.
+    Removing or replacing it should not affect the execution of the samples in anyway.
+  -->
+  <parent>
+    <groupId>com.google.cloud.samples</groupId>
+    <artifactId>shared-configuration</artifactId>
+    <version>1.2.0</version>
+  </parent>
+
+  <properties>
+    <!-- Java 8 because the Kokoro Sample test uses that Java version -->
+    <maven.compiler.target>1.8</maven.compiler.target>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>com.google.cloud</groupId>
+        <artifactId>libraries-bom</artifactId>
+        <version>24.3.0</version>
+        <type>pom</type>
+        <scope>import</scope>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.cloud</groupId>
+      <artifactId>google-cloud-core</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>com.google.cloud</groupId>
+      <artifactId>google-cloud-storage</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.13.2</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.google.truth</groupId>
+      <artifactId>truth</artifactId>
+      <version>1.1.3</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <!-- This plugin enables building the application to a JAR *not* using Native Image -->
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>3.2.2</version>
+        <configuration>
+          <archive>
+            <manifest>
+              <addClasspath>true</addClasspath>
+              <classpathPrefix>dependency-jars/</classpathPrefix>
+              <mainClass>com.example.storage.NativeImageStorageSample</mainClass>
+            </manifest>
+          </archive>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-dependency-plugin</artifactId>
+        <version>3.2.0</version>
+        <executions>
+          <execution>
+            <id>copy-dependencies</id>
+            <phase>package</phase>
+            <goals>
+              <goal>copy-dependencies</goal>
+            </goals>
+            <configuration>
+              <outputDirectory>
+                ${project.build.directory}/dependency-jars/
+              </outputDirectory>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+
+  <!-- Native Profile-->
+  <profiles>
+    <profile>
+      <id>native</id>
+
+      <dependencies>
+        <dependency>
+          <groupId>com.google.cloud</groupId>
+          <artifactId>native-image-support</artifactId>
+          <version>0.12.0</version>
+        </dependency>
+        <dependency>
+          <groupId>org.junit.vintage</groupId>
+          <artifactId>junit-vintage-engine</artifactId>
+          <version>5.8.2</version>
+          <scope>test</scope>
+        </dependency>
+        <dependency>
+          <groupId>org.graalvm.buildtools</groupId>
+          <artifactId>junit-platform-native</artifactId>
+          <version>0.9.9</version>
+          <scope>test</scope>
+        </dependency>
+      </dependencies>
+
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-surefire-plugin
+            </artifactId> <!-- Must use older version of surefire plugin for native-image testing. -->
+            <version>2.22.2</version>
+            <configuration>
+              <includes>
+                <include>**/*IT</include>
+              </includes>
+            </configuration>
+          </plugin>
+          <plugin>
+            <groupId>org.graalvm.buildtools</groupId>
+            <artifactId>native-maven-plugin</artifactId>
+            <version>0.9.9</version>
+            <extensions>true</extensions>
+            <configuration>
+              <mainClass>com.example.storage.NativeImageStorageSample</mainClass>
+              <buildArgs>
+                <buildArg>--no-fallback</buildArg>
+                <buildArg>--no-server</buildArg>
+              </buildArgs>
+            </configuration>
+            <executions>
+              <execution>
+                <id>build-native</id>
+                <goals>
+                  <goal>build</goal>
+                  <goal>test</goal>
+                </goals>
+                <phase>package</phase>
+              </execution>
+              <execution>
+                <id>test-native</id>
+                <goals>
+                  <goal>test</goal>
+                </goals>
+                <phase>test</phase>
+              </execution>
+            </executions>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
+</project>

samples/native-image-sample/src/main/java/com/example/storage/NativeImageStorageSample.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright 2022 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 com.google.cloud.BatchResult.Callback;
+import com.google.cloud.storage.Blob;
+import com.google.cloud.storage.BlobId;
+import com.google.cloud.storage.BlobInfo;
+import com.google.cloud.storage.BucketInfo;
+import com.google.cloud.storage.Storage;
+import com.google.cloud.storage.StorageBatch;
+import com.google.cloud.storage.StorageException;
+import com.google.cloud.storage.StorageOptions;
+import java.nio.charset.StandardCharsets;
+import java.util.UUID;
+
+/** Sample Storage application compiled with Native Image. */
+public class NativeImageStorageSample {
+
+  static String BUCKET_NAME = "nativeimage-sample-bucket-" + UUID.randomUUID();
+  static String FILENAME = "nativeimage-sample-file-" + UUID.randomUUID();
+
+  /** Runs the storage sample application. */
+  public static void main(String[] args) {
+
+    Storage storageClient = StorageOptions.getDefaultInstance().getService();
+
+    try {
+      createBucket(storageClient, BUCKET_NAME);
+      createFile(storageClient, BUCKET_NAME, FILENAME);
+      runBatchOperations(storageClient, BUCKET_NAME, FILENAME);
+    } finally {
+      System.out.println("Deleting resources.");
+      storageClient.delete(BUCKET_NAME, FILENAME);
+      storageClient.delete(BUCKET_NAME);
+    }
+  }
+
+  private static void runBatchOperations(
+      Storage storageClient, String bucketName, String fileName) {
+    BlobId blobId = BlobId.of(bucketName, fileName);
+
+    StorageBatch batch = storageClient.batch();
+    batch
+        .update(BlobInfo.newBuilder(blobId).build())
+        .notify(
+            new Callback<Blob, StorageException>() {
+              @Override
+              public void success(Blob blob) {
+                System.out.println("Batch update succeeded on " + fileName);
+              }
+
+              @Override
+              public void error(StorageException e) {
+                System.out.println("Batch update failed with cause: " + e);
+              }
+            });
+
+    batch.submit();
+  }
+
+  private static void createBucket(Storage storageClient, String bucketName) {
+    BucketInfo bucketInfo = BucketInfo.newBuilder(bucketName).setLocation("us-east1").build();
+    storageClient.create(bucketInfo);
+    System.out.println("Created bucket " + bucketName);
+  }
+
+  private static void createFile(Storage storageClient, String bucketName, String fileName) {
+    BlobInfo blobInfo =
+        BlobInfo.newBuilder(bucketName, fileName).setContentType("text/plain").build();
+    storageClient.create(blobInfo, "Hello World!".getBytes(StandardCharsets.UTF_8));
+    System.out.println("Created file " + blobInfo.getName());
+
+    Blob blob = storageClient.get(bucketName, fileName);
+    String content = new String(blob.getContent(), StandardCharsets.UTF_8);
+    System.out.println("Successfully wrote to file: " + content);
+  }
+}

samples/native-image-sample/src/test/java/com/example/storage/NativeImageStorageSampleIT.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2022 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.testing.junit4.StdOutCaptureRule;
+import org.junit.Rule;
+import org.junit.Test;
+
+public class NativeImageStorageSampleIT {
+
+  @Rule public StdOutCaptureRule stdOut = new StdOutCaptureRule();
+
+  @Test
+  public void createAndReadStorageResources() {
+    NativeImageStorageSample.main(new String[] {});
+    assertThat(stdOut.getCapturedOutputAsUtf8String())
+        .contains("Created bucket " + NativeImageStorageSample.BUCKET_NAME);
+    assertThat(stdOut.getCapturedOutputAsUtf8String())
+        .contains("Created file " + NativeImageStorageSample.FILENAME);
+    assertThat(stdOut.getCapturedOutputAsUtf8String())
+        .contains("Successfully wrote to file: Hello World!");
+  }
+}