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| 1 | +/* |
| 2 | + * Copyright 2023 Google LLC |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | + |
| 17 | +package com.example.spanner; |
| 18 | + |
| 19 | +// [START spanner_batch_write_at_least_once] |
| 20 | + |
| 21 | +import com.google.api.gax.rpc.ServerStream; |
| 22 | +import com.google.cloud.spanner.DatabaseClient; |
| 23 | +import com.google.cloud.spanner.DatabaseId; |
| 24 | +import com.google.cloud.spanner.Mutation; |
| 25 | +import com.google.cloud.spanner.MutationGroup; |
| 26 | +import com.google.cloud.spanner.Options; |
| 27 | +import com.google.cloud.spanner.Spanner; |
| 28 | +import com.google.cloud.spanner.SpannerOptions; |
| 29 | +import com.google.common.collect.ImmutableList; |
| 30 | +import com.google.rpc.Code; |
| 31 | +import com.google.spanner.v1.BatchWriteResponse; |
| 32 | + |
| 33 | +public class BatchWriteAtLeastOnceSample { |
| 34 | + |
| 35 | + /*** |
| 36 | + * Assume DDL for the underlying database: |
| 37 | + * <pre>{@code |
| 38 | + * CREATE TABLE Singers ( |
| 39 | + * SingerId INT64 NOT NULL, |
| 40 | + * FirstName STRING(1024), |
| 41 | + * LastName STRING(1024), |
| 42 | + * ) PRIMARY KEY (SingerId) |
| 43 | + * |
| 44 | + * CREATE TABLE Albums ( |
| 45 | + * SingerId INT64 NOT NULL, |
| 46 | + * AlbumId INT64 NOT NULL, |
| 47 | + * AlbumTitle STRING(1024), |
| 48 | + * ) PRIMARY KEY (SingerId, AlbumId), |
| 49 | + * INTERLEAVE IN PARENT Singers ON DELETE CASCADE |
| 50 | + * }</pre> |
| 51 | + */ |
| 52 | + |
| 53 | + private static final MutationGroup MUTATION_GROUP1 = |
| 54 | + MutationGroup.of( |
| 55 | + Mutation.newInsertOrUpdateBuilder("Singers") |
| 56 | + .set("SingerId") |
| 57 | + .to(16) |
| 58 | + .set("FirstName") |
| 59 | + .to("Scarlet") |
| 60 | + .set("LastName") |
| 61 | + .to("Terry") |
| 62 | + .build()); |
| 63 | + private static final MutationGroup MUTATION_GROUP2 = |
| 64 | + MutationGroup.of( |
| 65 | + Mutation.newInsertOrUpdateBuilder("Singers") |
| 66 | + .set("SingerId") |
| 67 | + .to(17) |
| 68 | + .set("FirstName") |
| 69 | + .to("Marc") |
| 70 | + .build(), |
| 71 | + Mutation.newInsertOrUpdateBuilder("Singers") |
| 72 | + .set("SingerId") |
| 73 | + .to(18) |
| 74 | + .set("FirstName") |
| 75 | + .to("Catalina") |
| 76 | + .set("LastName") |
| 77 | + .to("Smith") |
| 78 | + .build(), |
| 79 | + Mutation.newInsertOrUpdateBuilder("Albums") |
| 80 | + .set("SingerId") |
| 81 | + .to(17) |
| 82 | + .set("AlbumId") |
| 83 | + .to(1) |
| 84 | + .set("AlbumTitle") |
| 85 | + .to("Total Junk") |
| 86 | + .build(), |
| 87 | + Mutation.newInsertOrUpdateBuilder("Albums") |
| 88 | + .set("SingerId") |
| 89 | + .to(18) |
| 90 | + .set("AlbumId") |
| 91 | + .to(2) |
| 92 | + .set("AlbumTitle") |
| 93 | + .to("Go, Go, Go") |
| 94 | + .build()); |
| 95 | + |
| 96 | + static void batchWriteAtLeastOnce() { |
| 97 | + // TODO(developer): Replace these variables before running the sample. |
| 98 | + final String projectId = "my-project"; |
| 99 | + final String instanceId = "my-instance"; |
| 100 | + final String databaseId = "my-database"; |
| 101 | + batchWriteAtLeastOnce(projectId, instanceId, databaseId); |
| 102 | + } |
| 103 | + |
| 104 | + static void batchWriteAtLeastOnce(String projectId, String instanceId, String databaseId) { |
| 105 | + try (Spanner spanner = |
| 106 | + SpannerOptions.newBuilder().setProjectId(projectId).build().getService()) { |
| 107 | + DatabaseId dbId = DatabaseId.of(projectId, instanceId, databaseId); |
| 108 | + final DatabaseClient dbClient = spanner.getDatabaseClient(dbId); |
| 109 | + |
| 110 | + // Creates and issues a BatchWrite RPC request that will apply the mutation groups |
| 111 | + // non-atomically and respond back with a stream of BatchWriteResponse. |
| 112 | + ServerStream<BatchWriteResponse> responses = |
| 113 | + dbClient.batchWriteAtLeastOnce( |
| 114 | + ImmutableList.of(MUTATION_GROUP1, MUTATION_GROUP2), |
| 115 | + Options.tag("batch-write-tag")); |
| 116 | + |
| 117 | + // Iterates through the results in the stream response and prints the MutationGroup indexes, |
| 118 | + // commit timestamp and status. |
| 119 | + for (BatchWriteResponse response : responses) { |
| 120 | + if (response.getStatus().getCode() == Code.OK_VALUE) { |
| 121 | + System.out.printf( |
| 122 | + "Mutation group indexes %s have been applied with commit timestamp %s", |
| 123 | + response.getIndexesList(), response.getCommitTimestamp()); |
| 124 | + } else { |
| 125 | + System.out.printf( |
| 126 | + "Mutation group indexes %s could not be applied with error code %s and " |
| 127 | + + "error message %s", response.getIndexesList(), |
| 128 | + Code.forNumber(response.getStatus().getCode()), response.getStatus().getMessage()); |
| 129 | + } |
| 130 | + } |
| 131 | + } |
| 132 | + } |
| 133 | +} |
| 134 | + |
| 135 | +// [END spanner_batch_write_at_least_once] |
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