public class OrderService {
    private EmailSender emailSender = new EmailSender();
}

@Service
public class OrderService {

    private final EmailSender emailSender;

    public OrderService(EmailSender emailSender) {
        this.emailSender = emailSender;
    }
}

@Service
public class OrderService {

    @Autowired
    private EmailSender emailSender;
}

@Service
public class OrderService {

    private EmailSender emailSender;

    @Autowired
    public void setEmailSender(EmailSender emailSender) {
        this.emailSender = emailSender;
    }
}

public interface MessageSender {
    void send(String message);
}

@Component
public class EmailSender implements MessageSender {
    public void send(String message) {
        System.out.println(message);
    }
}

@Service
public class NotificationService {

    private final MessageSender messageSender;

    public NotificationService(MessageSender messageSender) {
        this.messageSender = messageSender;
    }
}

#Spring

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@Bean
public FlatFileItemReader<Person> reader() {
    return new FlatFileItemReaderBuilder<Person>()
        .name("personItemReader")
        .resource(new ClassPathResource("sample-data.csv"))
        .delimited()
        .names("firstName", "lastName")
        .targetType(Person.class)
        .build();
}

public class PersonItemProcessor implements ItemProcessor<Person, Person> {

    @Override
    public Person process(Person person) {
        return new Person(
            person.firstName().toUpperCase(),
            person.lastName().toUpperCase()
        );
    }
}

@Bean
public JdbcBatchItemWriter<Person> writer(DataSource dataSource) {
    return new JdbcBatchItemWriterBuilder<Person>()
        .sql("INSERT INTO people (first_name, last_name) VALUES (:firstName, :lastName)")
        .dataSource(dataSource)
        .beanMapped()
        .build();
}

@Bean
public Step step1(
        JobRepository jobRepository,
        DataSourceTransactionManager transactionManager,
        FlatFileItemReader<Person> reader,
        PersonItemProcessor processor,
        JdbcBatchItemWriter<Person> writer) {

    return new StepBuilder("step1", jobRepository)
        .<Person, Person>chunk(3, transactionManager)
        .reader(reader)
        .processor(processor)
        .writer(writer)
        .build();
}

@Override
public void afterJob(JobExecution jobExecution) {
    if (jobExecution.getStatus() == BatchStatus.COMPLETED) {
        jdbcTemplate
            .query(
                "SELECT first_name, last_name FROM people",
                new DataClassRowMapper<>(Person.class)
            )
            .forEach(person ->
                log.info("Found <{}> in the database.", person)
            );
    }
}

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