チュートリアル：Spring Data フレームワークの統合

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-mongodb</artifactId>
   <version>3.2.5 </version>
</dependency>
<dependency>
   <groupId>net.datafaker</groupId>
   <artifactId>datafaker</artifactId>
   <version>2.4.3</version>
</dependency>

@Configuration
public class MongoConfig {
    @Value("${mongodb.uri}")
    private String uri;
    @Value("${mongodb.database}")
    private String databaseName;
    @Bean
    public MongoClient mongoClient() {
        ConnectionString connectionString = new ConnectionString(uri);
        MongoClientSettings mongoClientSettings = MongoClientSettings.builder()
            .applyConnectionString(connectionString)
            .build();
        return MongoClients.create(mongoClientSettings);
    }
    @Bean
    public MongoTemplate mongoTemplate() throws Exception {
        return new MongoTemplate(mongoClient(), databaseName);
    }
}

mongodb.database=bulk
mongodb.uri=<connection string>
documentCount=25000

@Document("products")
public class Product {
    private static final Logger LOG = LoggerFactory.getLogger(Product.class);
    @Id
    private String id;
    private String name;
    private int qty;
    private double price;
    private Date available;
    private Date  unavailable;
    private String skuId;
    public Product(String name, int qty, double price, Date available, Date unavailable, String skuId) {
        this.name = name;
        this.qty = qty;
        this.price = price;
        this.available = available;
        this.unavailable = unavailable;
        this.skuId = skuId;
    }
    public static List<Product> randomProducts(int  count) {
        Faker faker = new Faker();
        Random rand = new Random();
        List<Product> retProds = new ArrayList<>(count);
        for (int i = 0; i < count; ++i) {
            Product product = new Product(faker.animal().name(),
                    1 + rand.nextInt(998),
                    10.0 + rand.nextInt(9999),
                    new Date(), new Date(),
                    faker.idNumber().valid());
            retProds.add(product);
        }
        return retProds;
    }
    // Getters and setters
}

@Repository
public class ProductRepository {
    private static final Logger LOG = LoggerFactory
            .getLogger(ProductRepository.class);
    private final MongoTemplate mongoTemplate;
    @Autowired
    public ProductRepository(MongoTemplate mongoTemplate){
        this.mongoTemplate = mongoTemplate;
    }
    public void updateProductQuantity(String name, int newQuantity) {
        Query query = new Query(Criteria.where("name").is(name));
        Update update = new Update();
        update.set("quantity", newQuantity);
        UpdateResult result = mongoTemplate.updateFirst(query, update, Product.class);
        if (result == null)
            LOG.error("No documents updated");
        else
            LOG.info(result.getModifiedCount() + " document(s) updated..");
    }
    public int bulkInsertProducts(int count) {
        LOG.info("Dropping collection...");
        mongoTemplate.dropCollection(Product.class);
        LOG.info("Dropped!");
        Instant start = Instant.now();
        mongoTemplate.setWriteConcern(WriteConcern.W1.withJournal(true));
        List<Product> productList = Product.randomProducts(count);
        BulkOperations bulkInsertion = mongoTemplate.bulkOps(BulkOperations.BulkMode.UNORDERED, Product.class);
        bulkInsertion.insert(productList);
        BulkWriteResult bulkWriteResult = bulkInsertion.execute();
        LOG.info("Bulk insert of " + bulkWriteResult.getInsertedCount() + " documents completed in " + Duration.between(start, Instant.now()).toMillis() + " milliseconds");
        return bulkWriteResult.getInsertedCount();
    }
}

@SpringBootApplication
public class SpringDataBulkInsertApplication implements CommandLineRunner {
    @Value("${documentCount}")
    private int count;
    private static final Logger LOG = LoggerFactory
            .getLogger(SpringDataBulkInsertApplication.class);
    @Autowired
    private ProductRepository repository;
    public static void main(String[] args) {
        SpringApplication.run(SpringDataBulkInsertApplication.class, args);
    }
    @Override
    public void run(String... args) throws Exception {
        repository.bulkInsertProducts(count);
        LOG.info("End run");
        System.exit(0);
    }
}