/
TransactionTimeoutExample.java
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/
TransactionTimeoutExample.java
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/*
* Copyright 2023 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_transaction_timeout]
import com.google.cloud.spanner.DatabaseClient;
import com.google.cloud.spanner.DatabaseId;
import com.google.cloud.spanner.ResultSet;
import com.google.cloud.spanner.Spanner;
import com.google.cloud.spanner.SpannerOptions;
import com.google.cloud.spanner.Statement;
import io.grpc.Context;
import io.grpc.Context.CancellableContext;
import io.grpc.Deadline;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
/**
* Sample showing how to set a timeout for an entire transaction for the Cloud Spanner Java client.
*/
class TransactionTimeoutExample {
static void executeTransactionWithTimeout() {
// TODO(developer): Replace these variables before running the sample.
String projectId = "my-project";
String instanceId = "my-instance";
String databaseId = "my-database";
executeTransactionWithTimeout(projectId, instanceId, databaseId, 60L, TimeUnit.SECONDS);
}
// Execute a read/write transaction with a timeout for the entire transaction.
static void executeTransactionWithTimeout(
String projectId,
String instanceId,
String databaseId,
long timeoutValue,
TimeUnit timeoutUnit) {
try (Spanner spanner = SpannerOptions.newBuilder().setProjectId(projectId).build()
.getService()) {
DatabaseClient client =
spanner.getDatabaseClient(DatabaseId.of(projectId, instanceId, databaseId));
// Create a gRPC context with a deadline and with cancellation.
// gRPC context deadlines require the use of a scheduled executor.
ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
try (CancellableContext context =
Context.current()
.withDeadline(Deadline.after(timeoutValue, timeoutUnit), executor)
.withCancellation()) {
context.run(
() -> {
client
.readWriteTransaction()
.run(
transaction -> {
try (ResultSet resultSet =
transaction.executeQuery(
Statement.of(
"SELECT SingerId, FirstName, LastName\n"
+ "FROM Singers\n"
+ "ORDER BY LastName, FirstName"))) {
while (resultSet.next()) {
System.out.printf(
"%d %s %s\n",
resultSet.getLong("SingerId"),
resultSet.getString("FirstName"),
resultSet.getString("LastName"));
}
}
String sql =
"INSERT INTO Singers (SingerId, FirstName, LastName)\n"
+ "VALUES (20, 'George', 'Washington')";
long rowCount = transaction.executeUpdate(Statement.of(sql));
System.out.printf("%d record inserted.%n", rowCount);
return null;
});
});
}
}
}
}
// [END spanner_transaction_timeout]