chore: update method and credentials (#79)

* feat: new sample - Tables: Copy multiple tables

b/147141782

* update test to create new destination table for each test since existing table cannot be overwritten and would throw bigquery error

* add env vars for sample test builds

* update testing var names

* format code

* chore: update method and credentials

1. update extract table to json job to allow wait time
2. update testing credentials

.kokoro/run_samples_tests.sh

@@ -28,12 +28,8 @@ echo "********** MAVEN INFO  ***********"
 mvn -v
 
 # Setup required env variables
-export GOOGLE_CLOUD_PROJECT=java-docs-samples-testing
-export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-acct.json
-export BIGQUERY_DATASET_NAME=bigquery_test_dataset
-export GCS_BUCKET=java-docs-samples-testing
-export BIGQUERY_TABLE1=table1
-export BIGQUERY_TABLE2=table2
+source ${KOKORO_GFILE_DIR}/bigquery_secrets.txt
+echo "********** Successfully Set All Environment Variables **********"
 
 # Activate service account
 gcloud auth activate-service-account \

samples/src/main/java/com/example/bigquery/ExtractTableToJson.java

@@ -17,12 +17,14 @@
 package com.example.bigquery;
 
 // [START bigquery_extract_table]
+import com.google.cloud.RetryOption;
 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.Table;
 import com.google.cloud.bigquery.TableId;
+import org.threeten.bp.Duration;
 
 public class ExtractTableToJson {
 
@@ -54,7 +56,10 @@ public static void extractTableToJson(
       Job job = table.extract("CSV", destinationUri);
 
       // Blocks until this job completes its execution, either failing or succeeding.
-      Job completedJob = job.waitFor();
+      Job completedJob =
+          job.waitFor(
+              RetryOption.initialRetryDelay(Duration.ofSeconds(1)),
+              RetryOption.totalTimeout(Duration.ofMinutes(3)));
       if (completedJob == null) {
         System.out.println("Job not executed since it no longer exists.");
         return;