docs(samples): add get job (#503)

Author: Praful Makani

samples/snippets/src/main/java/com/example/bigquery/CreateJob.java

@@ -59,12 +59,12 @@ public static void createJob(String query) {
       // Get a job that was just created
       Job job = bigquery.getJob(jobId);
       if (job.getJobId().getJob().equals(jobId.getJob())) {
-        System.out.println("Job created successfully");
+        System.out.print("Job created successfully." + job.getJobId().getJob());
       } else {
-        System.out.println("Job was not created");
+        System.out.print("Job was not created");
       }
     } catch (BigQueryException e) {
-      System.out.println("Job was not created. \n" + e.toString());
+      System.out.print("Job was not created. \n" + e.toString());
     }
   }
 }

samples/snippets/src/main/java/com/example/bigquery/GetJob.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2020 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.bigquery;
+
+// [START bigquery_get_job]
+import com.google.cloud.bigquery.BigQuery;
+import com.google.cloud.bigquery.BigQueryException;
+import com.google.cloud.bigquery.BigQueryOptions;
+import com.google.cloud.bigquery.Job;
+import com.google.cloud.bigquery.JobId;
+
+// Sample to get a job
+public class GetJob {
+
+  public static void runGetJob() {
+    // TODO(developer): Replace these variables before running the sample.
+    String jobName = "MY_JOB_NAME";
+    getJob(jobName);
+  }
+
+  public static void getJob(String jobName) {
+    try {
+      // Initialize client that will be used to send requests. This client only needs to be created
+      // once, and can be reused for multiple requests.
+      BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();
+
+      JobId jobId = JobId.of(jobName);
+      Job job = bigquery.getJob(jobId);
+      System.out.println("Job retrieved successfully");
+    } catch (BigQueryException e) {
+      System.out.println("Job not retrieved. \n" + e.toString());
+    }
+  }
+}
+// [END bigquery_get_job]

samples/snippets/src/test/java/com/example/bigquery/GetJobIT.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2020 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.bigquery;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+public class GetJobIT {
+
+  private String jobName;
+  private ByteArrayOutputStream bout;
+  private PrintStream out;
+
+  @Before
+  public void setUp() {
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    System.setOut(out);
+
+    String query = "SELECT country_name from `bigquery-public-data.utility_us.country_code_iso`";
+    CreateJob.createJob(query);
+    String result = bout.toString();
+    jobName = result.substring(result.lastIndexOf(".") + 1);
+
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    System.setOut(out);
+  }
+
+  @After
+  public void tearDown() {
+    System.setOut(null);
+  }
+
+  @Test
+  public void testGetJob() {
+    GetJob.getJob(jobName);
+    assertThat(bout.toString()).contains("Job retrieved successfully");
+  }
+}