Add list recommendations code sample

recommender/beta/cloud-client/README.md

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+# Getting Started with Recommender and the Google Java API Client library
+
+<a href="https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/GoogleCloudPlatform/java-docs-samples&page=editor&open_in_editor=README.md&cloudshell_working_dir=recommender/beta/cloud-client/">
+<img alt="Open in Cloud Shell" src ="http://gstatic.com/cloudssh/images/open-btn.png"></a>
+
+[Cloud Recommender](https://cloud.google.com/recommender/) is a service on Google Cloud that provides 
+usage recommendations for Cloud products and services. This sample Java 
+application demonstrates how to access the Recommender API using the 
+[Google Cloud Client Library for Java](https://github.com/GoogleCloudPlatform/google-cloud-java).
+
+## Quickstart
+
+### Setup
+- [Set up a Java Development Environment for Maven](https://cloud.google.com/java/docs/setup).
+- [Enable Recommender API](https://cloud.google.com/recommender/docs/enabling) for your project.
+- [Authenticate using a service account](https://cloud.google.com/docs/authentication/getting-started).
+Create a service account, download a JSON key file, and set the 
+`GOOGLE_APPLICATION_CREDENTIALS` environment variable.
+- Set the `GOOGLE_CLOUD_PROJECT` environment variable to your project ID.
+
+### Build
+Build your project with:
+```
+mvn clean package -DskipTests
+```
+
+## Testing
+To run the unit tests:
+```
+mvn clean verify
+```

recommender/beta/cloud-client/pom.xml

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+<!--
+  Copyright 2019 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.
+-->
+<project>
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.example.recommender</groupId>
+  <artifactId>recommender-samples</artifactId>
+  <packaging>jar</packaging>
+
+  <!--
+    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>1.0.11</version>
+  </parent>
+
+  <properties>
+    <maven.compiler.target>1.8</maven.compiler.target>
+    <maven.compiler.source>1.8</maven.compiler.source>
+  </properties>
+
+  <!-- [START recommender_java_dependencies] -->
+  <!--  Using libraries-bom to manage versions.
+  See https://github.com/GoogleCloudPlatform/cloud-opensource-java/wiki/The-Google-Cloud-Platform-Libraries-BOM -->
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>com.google.cloud</groupId>
+        <artifactId>libraries-bom</artifactId>
+        <version>3.0.0</version>
+        <type>pom</type>
+        <scope>import</scope>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.cloud</groupId>
+      <artifactId>google-cloud-recommender</artifactId>
+      <version>0.1.2</version>
+    </dependency>
+    <!-- [END recommender_java_dependencies] -->
+
+    <!-- Test dependencies -->
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.12</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.google.truth</groupId>
+      <artifactId>truth</artifactId>
+      <version>1.0</version>
+      <scope>test</scope>
+    </dependency>
+    <!-- [START recommender_java_dependencies] -->
+  </dependencies>
+  <!-- [END recommender_java_dependencies] -->
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>exec-maven-plugin</artifactId>
+        <version>1.6.0</version>
+        <configuration>
+          <cleanupDaemonThreads>false</cleanupDaemonThreads>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>

recommender/beta/cloud-client/src/main/java/com/example/recommender/ListRecommendations.java

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+/*
+ * Copyright 2019 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.recommender;
+
+// [START recommender_list_recommendations]
+
+import com.google.api.gax.rpc.InvalidArgumentException;
+import com.google.api.gax.rpc.PermissionDeniedException;
+import com.google.cloud.recommender.v1beta1.ListRecommendationsRequest;
+import com.google.cloud.recommender.v1beta1.Recommendation;
+import com.google.cloud.recommender.v1beta1.RecommenderClient;
+import com.google.cloud.recommender.v1beta1.RecommenderClient.ListRecommendationsPagedResponse;
+import java.io.IOException;
+
+public class ListRecommendations {
+
+  // List IAM recommendations for GOOGLE_CLOUD_PROJECT environment variable
+  public static void listRecommendations() throws IOException {
+    // TODO(developer): Replace the projectId variable before running the sample.
+    String projectId = "my-project-id";
+
+    // Google Cloud location where resources associated with the recommendations are located (for
+    // example, "global" or "us-central1-a"). For a full list of supported regions, visit
+    // https://cloud.google.com/compute/docs/regions-zones/
+    String location = "global";
+
+    // Fully-qualified recommender ID (for example, "google.iam.policy.Recommender" or
+    // "google.compute.instance.MachineTypeRecommender"). For a full list of supported recommenders
+    // visit https://cloud.google.com/recommender/docs/recommenders#recommenders
+    String recommender = "google.iam.policy.Recommender";
+
+    listRecommendations(projectId, location, recommender);
+  }
+
+  // List recommendations for a specified project, location, and recommender
+  public static void listRecommendations(String projectId, String location, String recommender)
+      throws IOException {
+    // Initialize client that will be used to send requests. This client only needs to be created
+    // once, and can be reused for multiple requests. After completing all of your requests, call
+    // the "close" method on the client to safely clean up any remaining background resources.
+    try (RecommenderClient recommenderClient = RecommenderClient.create()) {
+      /// Build the request
+      String parent =
+          String.format(
+              "projects/%s/locations/%s/recommenders/%s", projectId, location, recommender);
+      ListRecommendationsRequest request =
+          ListRecommendationsRequest.newBuilder().setParent(parent).build();
+
+      try {
+        // Send the request
+        ListRecommendationsPagedResponse response = recommenderClient.listRecommendations(request);
+
+        // Print out each recommendation
+        for (Recommendation responseItem : response.iterateAll()) {
+          Recommendation recommendation = responseItem;
+          System.out.println("Recommendation name: " + recommendation.getName());
+          System.out.println("- description: " + recommendation.getDescription());
+          System.out.println(
+              "- primary_impact.category: " + recommendation.getPrimaryImpact().getCategory());
+          System.out.println("- state_info.state: " + recommendation.getStateInfo().getState());
+          System.out.println();
+        }
+
+        // Indicate the request was successful
+        System.out.println("List recommendations successful");
+      } catch (PermissionDeniedException e) {
+        System.out.println("Permission denied for project '" + projectId
+            + "'. Ensure you have the appropriate permissions to list recommendations: \n" + e
+            .toString());
+      } catch (InvalidArgumentException e) {
+        System.out.println(
+            ("Invalid argument for projectId. Ensure you have 'GOOGLE_CLOUD_PROJECT' set: \n"
+                + e.toString()));
+      }
+    }
+  }
+}
+// [END recommender_list_recommendations]

recommender/beta/cloud-client/src/test/java/com/example/recommender/ListRecommendationsTest.java

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+/*
+ * Copyright 2019 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.recommender;
+
+import static com.google.common.truth.Truth.assertThat;
+import static junit.framework.TestCase.assertNotNull;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class ListRecommendationsTest {
+
+  private static final String PROJECT_ID = System.getenv("GOOGLE_CLOUD_PROJECT");
+  private static final String LOCATION = "global";
+  private static final String RECOMMENDER = "google.iam.policy.Recommender";
+
+  private ByteArrayOutputStream bout;
+  private PrintStream out;
+
+  private static void requireEnvVar(String varName) {
+    assertNotNull(
+        System.getenv(varName),
+        "Environment variable '%s' is required to perform these tests.".format(varName)
+    );
+  }
+
+  @BeforeClass
+  public static void checkRequirements() {
+    requireEnvVar("GOOGLE_APPLICATION_CREDENTIALS");
+    requireEnvVar("GOOGLE_CLOUD_PROJECT");
+  }
+
+  @Before
+  public void setUp() throws Exception {
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    System.setOut(out);
+  }
+
+  @After
+  public void tearDown() {
+    System.setOut(null);
+  }
+
+  @Test
+  public void listRecommendations() throws IOException {
+    ListRecommendations.listRecommendations(PROJECT_ID, LOCATION, RECOMMENDER);
+
+    assertThat(bout.toString()).contains("List recommendations successful");
+  }
+}