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docs: add sample for transaction timeouts (googleapis#2599)
Our current samples show how to set timeout and retry settings for all RPC invocations for a given RPC method, and how to set a timeout for a single statement, but we did not have a sample for setting a timeout for an entire transaction. This is something that customers have been asking multiple times. This sample shows how a transaction timeout can be set by using a gRPC context with a timeout.
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samples/snippets/src/main/java/com/example/spanner/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] | ||
|
|
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| 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 { | ||
|
|
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| 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); | ||
| } | ||
|
|
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| // 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] |
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