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/*
* Copyright 2022 Google Inc.
*
* 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.spanner;
// [START spanner_postgresql_async_query_to_list]
import com.google.api.core.ApiFuture;
import com.google.cloud.spanner.AsyncResultSet;
import com.google.cloud.spanner.DatabaseClient;
import com.google.cloud.spanner.DatabaseId;
import com.google.cloud.spanner.Spanner;
import com.google.cloud.spanner.SpannerOptions;
import com.google.cloud.spanner.Statement;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
public class PgAsyncQueryToListAsyncExample {
static class Album {
final long singerId;
final long albumId;
final String albumTitle;
Album(long singerId, long albumId, String albumTitle) {
this.singerId = singerId;
this.albumId = albumId;
this.albumTitle = albumTitle;
}
}
static void asyncQueryToList() throws InterruptedException, ExecutionException, TimeoutException {
// TODO(developer): Replace these variables before running the sample.
String projectId = "my-project";
String instanceId = "my-instance";
String databaseId = "my-database";
try (Spanner spanner =
SpannerOptions.newBuilder().setProjectId(projectId).build().getService()) {
DatabaseClient client =
spanner.getDatabaseClient(DatabaseId.of(projectId, instanceId, databaseId));
asyncQueryToList(client);
}
}
// Execute a query asynchronously and transform the result to a list.
static void asyncQueryToList(DatabaseClient client)
throws InterruptedException, ExecutionException, TimeoutException {
ExecutorService executor = Executors.newSingleThreadExecutor();
ApiFuture<? extends List<Album>> albums;
try (AsyncResultSet resultSet =
client
.singleUse()
.executeQueryAsync(Statement.of("SELECT singerid as \"SingerId\", "
+ "albumid as \"AlbumId\", albumtitle as \"AlbumTitle\" "
+ "FROM Albums"))) {
// Convert the result set to a list of Albums asynchronously.
albums =
resultSet.toListAsync(
reader -> {
return new Album(
reader.getLong("SingerId"),
reader.getLong("AlbumId"),
reader.getString("AlbumTitle"));
},
executor);
}
for (Album album : albums.get(30L, TimeUnit.SECONDS)) {
System.out.printf("%d %d %s%n", album.singerId, album.albumId, album.albumTitle);
}
executor.shutdown();
}
}
//[END spanner_postgresql_async_query_to_list]