ドメイン駆動設計基礎講座〜戦略編〜

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υϝΠϯۦಈઃܭجૅߨ࠲ ʙઓུฤʙ ͔ͱ͡ΎΜ !KJLP

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ශ݂঱ޱ࠲ؒૹۚαʔϏε public class BankAccountService {  @Data  public static class Result {  private BankAccount to;  private BankAccount from;  }    public static Result moveData(BankAccount to, BankAccount from, Money amount) {  BigDecimal totalAmount = BigDecimal.ZERO;  for(BankAccountEvent event : to.getEvents()) {  totalAmount = totalAmount.add(event.getAmount().getAmount());  }  if (totalAmount.compareTo(amount.getAmount()) < 0) {  throw new IllegalArgumentException("total amount is less than zero!");  }  BankAccountEvent decrementEvent = new BankAccountEvent();  decrementEvent.setId(IdGenerator.generateId());  decrementEvent.setFromBankAccountId(from.getId());  decrementEvent.setToBankAccountId(to.getId());  Money negated = new Money();  negated.setCurrency(amount.getCurrency());  negated.setAmount(amount.getAmount().negate());  decrementEvent.setAmount(negated);  decrementEvent.setOccurredAt(ZonedDateTime.now());  BankAccount newFrom = new BankAccount();  List newFromEvent = Lists.newArrayList(from.getEvents());  newFromEvent.add(decrementEvent);  newFrom.setId(from.getId());  newFrom.setEvents(newFromEvent);    BankAccountEvent incrementEvent = new BankAccountEvent();  incrementEvent.setId(IdGenerator.generateId());  incrementEvent.setFromBankAccountId(from.getId());  incrementEvent.setToBankAccountId(to.getId());  incrementEvent.setAmount(amount);  incrementEvent.setOccurredAt(ZonedDateTime.now());  BankAccount newTo = new BankAccount();  List newToEvent = Lists.newArrayList(to.getEvents());  newToEvent.add(incrementEvent);  newTo.setId(to.getId());  newTo.setEvents(newToEvent);    Result result = new Result();  result.setFrom(newFrom);  result.setTo(newTo);  return result;    }    } ޱ࠲࢒ߴͷνΣοΫ͸ ޱ࠲ࣗ৴Ͱ͸ͳ͘ ϩδοΫͰؤுΔ ۩ମతա͗Δৄࡉʹ ѹ౗͞Εͯ͠·͏ʜɻ ػೳ͕ଟ͍ͱ໰୊͕ ͞ΒʹෳࡶʹͳΔɻ ίʔυͷॏෳʹ΋ؾ͖ͮʹ͍͘ɻ ͜ΕͰ͸υϝΠϯΤΩεύʔτ ͱͷؒʹ௨༁͕ඞཁʹͳΔ ݮࢉͷ֓೦͕҉໧஌Ͱ ཧղ͠ʹ͍͘

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ශ݂঱ޱ࠲ؒૹۚαʔϏεͷ࢖͍ํ Money baseMoney = new Money();  baseMoney.setCurrency(Currency.getInstance("JPY"));  baseMoney.setAmount(10000);  // ޱ࠲Λએݴ͠ɺॳظೖۚΛߦ͏  BankAccount bankAccount1 = new BankAccount();  bankAccount1.setId(IdGenerator.generateId());  List events1 = Lists.newArrayList();  BankAccountEvent incrementEvent1 = new BankAccountEvent();  incrementEvent1.setId(IdGenerator.generateId());  incrementEvent1.setToBankAccountId(bankAccount1.getId());  incrementEvent1.setFromBankAccountId(null);  incrementEvent1.setAmount(baseMoney);  incrementEvent1.setOccurredAt(ZonedDateTime.now());  events1.add(incrementEvent1);  bankAccount1.setEvents(events1);      BankAccount bankAccount2 = new BankAccount();  bankAccount2.setId(IdGenerator.generateId());  List events2 = Lists.newArrayList();  BankAccountEvent incrementEvent2 = new BankAccountEvent();  incrementEvent2.setId(IdGenerator.generateId());  incrementEvent2.setToBankAccountId(bankAccount1.getId());  incrementEvent2.setFromBankAccountId(null);  incrementEvent2.setAmount(baseMoney);  incrementEvent2.setOccurredAt(ZonedDateTime.now());  events2.add(incrementEvent2);  bankAccount2.setEvents(events2);    Money totalAmount1 = getTotal(bankAccount1);  Money totalAmount2 = getTotal(bankAccount2);    System.out.println("bankAccount1 = " + totalAmount1);  System.out.println("bankAccount2 = " + totalAmount2);    Money data = new Money();  data.setCurrency(bankAccount1.getEvents().get(0).getAmount().getCurrency());  data.setAmount(BigDecimal.valueOf(10000));  // ޱ࠲ؒૹۚΛߦ͏  BankAccountService.Result result = BankAccountService.moveData(  bankAccount1,  bankAccount2,  data  );    Money newTotalAmount1 = getTotal(result.getTo());  Money newTotalAmount2 = getTotal(result.getFrom());    System.out.println("toTotalAmount = " + newTotalAmount1);  System.out.println("fromTotalAmount = " + newTotalAmount2); ΋͸΍ίʔυΛಡΉؾʹͳΒ ͳ͍ɻυϝΠϯϞσϧ͕ࣔ͢ ߟ͑ํ͕े෼ʹ൓ө͞Ε͍ͯ ͳ͍ͨΊɺ͜ͷ࣮૷Λίϛϡ χέʔγϣϯʹ࢖͏͜ͱ͸೉ ͍͠ɻ

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