docs(samples): add copy dataset (#389)

samples/snippets/src/main/java/com/example/bigquerydatatransfer/CopyDataset.java

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+/*
+ * 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.bigquerydatatransfer;
+
+// [START bigquerydatatransfer_copy_dataset]
+import com.google.api.gax.rpc.ApiException;
+import com.google.cloud.bigquery.datatransfer.v1.CreateTransferConfigRequest;
+import com.google.cloud.bigquery.datatransfer.v1.DataTransferServiceClient;
+import com.google.cloud.bigquery.datatransfer.v1.ProjectName;
+import com.google.cloud.bigquery.datatransfer.v1.TransferConfig;
+import com.google.protobuf.Struct;
+import com.google.protobuf.Value;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+// Sample to copy dataset from another gcp project
+public class CopyDataset {
+
+  public static void main(String[] args) throws IOException {
+    // TODO(developer): Replace these variables before running the sample.
+    final String destinationProjectId = "MY_DESTINATION_PROJECT_ID";
+    final String destinationDatasetId = "MY_DESTINATION_DATASET_ID";
+    final String sourceProjectId = "MY_SOURCE_PROJECT_ID";
+    final String sourceDatasetId = "MY_SOURCE_DATASET_ID";
+    Map<String, Value> params = new HashMap<>();
+    params.put("source_project_id", Value.newBuilder().setStringValue(sourceProjectId).build());
+    params.put("source_dataset_id", Value.newBuilder().setStringValue(sourceDatasetId).build());
+    TransferConfig transferConfig =
+        TransferConfig.newBuilder()
+            .setDestinationDatasetId(destinationDatasetId)
+            .setDisplayName("Your Dataset Copy Name")
+            .setDataSourceId("cross_region_copy")
+            .setParams(Struct.newBuilder().putAllFields(params).build())
+            .setSchedule("every 24 hours")
+            .build();
+    copyDataset(destinationProjectId, transferConfig);
+  }
+
+  public static void copyDataset(String projectId, TransferConfig transferConfig)
+      throws IOException {
+    try (DataTransferServiceClient dataTransferServiceClient = DataTransferServiceClient.create()) {
+      ProjectName parent = ProjectName.of(projectId);
+      CreateTransferConfigRequest request =
+          CreateTransferConfigRequest.newBuilder()
+              .setParent(parent.toString())
+              .setTransferConfig(transferConfig)
+              .build();
+      TransferConfig config = dataTransferServiceClient.createTransferConfig(request);
+      System.out.println("Copy dataset created successfully :" + config.getName());
+    } catch (ApiException ex) {
+      System.out.print("Copy dataset was not created." + ex.toString());
+    }
+  }
+}
+// [END bigquerydatatransfer_copy_dataset]

samples/snippets/src/test/java/com/example/bigquerydatatransfer/CopyDatasetIT.java

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+/*
+ * 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.bigquerydatatransfer;
+
+import static com.google.common.truth.Truth.assertThat;
+import static junit.framework.TestCase.assertNotNull;
+
+import com.google.cloud.bigquery.BigQuery;
+import com.google.cloud.bigquery.BigQueryOptions;
+import com.google.cloud.bigquery.DatasetInfo;
+import com.google.cloud.bigquery.datatransfer.v1.TransferConfig;
+import com.google.protobuf.Struct;
+import com.google.protobuf.Value;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class CopyDatasetIT {
+
+  private static final Logger LOG = Logger.getLogger(CopyDatasetIT.class.getName());
+  private BigQuery bigquery;
+  private ByteArrayOutputStream bout;
+  private String name;
+  private String displayName;
+  private String datasetName;
+  private PrintStream out;
+  private PrintStream originalPrintStream;
+
+  private static final String PROJECT_ID = requireEnvVar("GOOGLE_CLOUD_PROJECT");
+
+  private static String requireEnvVar(String varName) {
+    String value = System.getenv(varName);
+    assertNotNull(
+        "Environment variable " + varName + " is required to perform these tests.",
+        System.getenv(varName));
+    return value;
+  }
+
+  @BeforeClass
+  public static void checkRequirements() {
+    requireEnvVar("GOOGLE_CLOUD_PROJECT");
+  }
+
+  @Before
+  public void setUp() {
+    displayName = "MY_COPY_DATASET_NAME_TEST_" + UUID.randomUUID().toString().substring(0, 8);
+    datasetName = "MY_DATASET_NAME_TEST_" + UUID.randomUUID().toString().substring(0, 8);
+    // create a temporary dataset
+    bigquery = BigQueryOptions.getDefaultInstance().getService();
+    bigquery.create(DatasetInfo.of(datasetName));
+
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    originalPrintStream = System.out;
+    System.setOut(out);
+  }
+
+  @After
+  public void tearDown() throws IOException {
+    // TODO(pmakani) replace DeleteTransferConfig once PR merged.
+    // Clean up
+    DeleteScheduledQuery.deleteScheduledQuery(name);
+    // delete a temporary dataset
+    bigquery.delete(datasetName, BigQuery.DatasetDeleteOption.deleteContents());
+    // restores print statements in the original method
+    System.out.flush();
+    System.setOut(originalPrintStream);
+    LOG.log(Level.INFO, bout.toString());
+  }
+
+  @Test
+  public void testCopyDataset() throws IOException {
+    Map<String, Value> params = new HashMap<>();
+    params.put(
+        "source_project_id", Value.newBuilder().setStringValue("bigquery-public-data").build());
+    params.put("source_dataset_id", Value.newBuilder().setStringValue("usa_names").build());
+    TransferConfig transferConfig =
+        TransferConfig.newBuilder()
+            .setDestinationDatasetId(datasetName)
+            .setDisplayName(displayName)
+            .setDataSourceId("cross_region_copy")
+            .setParams(Struct.newBuilder().putAllFields(params).build())
+            .setSchedule("every 24 hours")
+            .build();
+    CopyDataset.copyDataset(PROJECT_ID, transferConfig);
+    String result = bout.toString();
+    name = result.substring(result.indexOf(":") + 1, result.length() - 1);
+    assertThat(result).contains("Copy dataset created successfully :");
+  }
+}