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"*Y&4
"*ʹΑΔΠϕϯτετʔϛϯάਤ͔Βͷίʔυੜ
OST Ҹએ
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2
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։࠵ʂ
͓ΊͰͱ͏͍͟͝·͢ʂʂ
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ͱ͜ΖͰ
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͜ͷࠂݟ·ͨ͠ʁ
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͜ͷࠂݟ·ͨ͠ʁ
࣮$234 &4͕͜͜ʹજΜͰ͍ΔͷͰ͢ʂʂ
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9ͷࠂϚωʔδϟʔ
ΠϕϯτιʔγϯάͬΆ͍
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9ͷࠂϚωʔδϟʔ
$234
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ͬͺ9ຽ$234 &4ͩΑͳʂʂ
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ϓϩϙʔβϧ
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Πϕϯτετʔϛϯά
ਤͷ࣮
"*࣌ͷίʔσΟϯά
"*ʹΑΔΠϕϯτετʔϛϯάਤ͔Βͷίʔυੜ
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Πϕϯτετʔϛϯά
ਤͷ࣮
"*࣌ͷίʔσΟϯά
"*ʹΑΔΠϕϯτετʔϛϯάਤ͔Βͷίʔυੜ
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̏ͭͷϑΣʔζ
l ϏοάϐΫνϟʔ
l શମ૾ΛѲ͢Δ
l ϏδωεϓϩηεϞσϦϯά
l ղ૾Λ্͛Δ
l ιϑτΣΞγεςϜϞσϦϯά
l ࣮ʹ͚ͨઃܭΛ͢Δ
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ϏοάϐΫνϟʔ
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ϏδωεϓϩηεϞσϦϯά
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ιϑτΣΞγεςϜϞσϦϯά
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̍ɽΠϕϯτΛᝦʹॻ͖ग़͢
̎ɽΠϕϯτΛฒͼସ͑Δ
̏ɽίϚϯυूɾ֎෦γεςϜΛՃ͢Δ
̐ɽϙϦγʔΛՃ͢Δ
̑ɽશମͷ֬ೝͱσΟεΧογϣϯ
ͬ͘͟ΓϏδωεϓϩηεϞσϦϯά·Ͱͷखॱ
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ϏϧσΟϯάϒϩοΫ
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ΞΫλʔ
ίϚϯυʢޙड़ʣΛ
࣮ߦ͢Δओମ
ΞΫλʔ
ίϚϯυͷ࣮ߦʹ
ؔ͢Δஅ͢Δ
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ίϚϯυ
ԿΒ͔ͷΞΫγϣϯΛ
࣮ߦ͢Δҙਤཁٻ
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ू
ίϚϯυΛॲཧ͢Δ
ΦϒδΣΫτ
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Πϕϯτ
Ϗδωε্Ͱൃੜͨ͠
ॏཁͳग़དྷࣄࣄ࣮
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ϦʔυϞσϧ
σʔλͷಡΈऔΓʹ
࠷దԽ͞Εͨ
σʔλߏϏϡʔ
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ϙϦγʔ
ࣗಈԽ͞Εͨ
அϩδοΫ
݅Λ͍ΕΔͷ
OSTྲྀ
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ϙϦγʔ
ۭཝͷϙϦγʔ
ʮඞͣʯͷҙຯ
˞ϙϦγʔʹ໊લΛ͚ͭͯ
͋·Γʹཱͨͳ͍ͷͰ
ۭཝʹ͢Δͷ OST ࣜ
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֎෦γεςϜ
ରγεςϜͷ
ڥք֎ʹ͋ΔγεςϜ
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දهͷҙຯɿෳͷΠϕϯτ
݁Ռͷذ
ෳͷग़དྷࣄ͕ฒྻʹى͖Δ
͜ͱΛද͢
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● ᝦಛఆͷᝦ͔Β͔͠ܨ͛ΒΕͳ͍
ϧʔϧ
ࠨਤͷҹͷ
ܨ͕ΓํҎ֎
/(
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Πϕϯτετʔϛϯά
ਤͷ࣮
"*࣌ͷίʔσΟϯά
"*ʹΑΔΠϕϯτετʔϛϯάਤ͔Βͷίʔυੜ
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ΞΫλʔ
ΞΫλʔͱίϚϯυ
͍͍ͨͯ
$6%ͷ "1*ͱͳΔ
ʢ8FCͷ߹ʣ
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@Operation(summary = "Creating a new doc.")
@PostMapping
@ResponseStatus(HttpStatus.CREATED)
public DocsPostResponse post(@Validated @RequestBody DocsPostRequest request) {
var command = new DocCreate(new DocId(), request.body());
DocId docId = commandGateway.sendAndWait(command);
return new DocsPostResponse(docId.value());
}
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public record DocCreate(DocId docId, String body) implements DocCommand {
}
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ू
ίϚϯυΛॲཧ͢Δ
ΦϒδΣΫτΛ
ఆٛ͢Δ
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@Aggregate
public class DocAggregate extends AbstractAggregate {
@Override
protected DocId getAggregateRootId(Doc aggregate) {
if (aggregate != null) {
return aggregate.docId();
} else {
return null;
}
}
public DocAggregate() {
}
@CommandHandler
public DocAggregate(DocCreate command) {
var event = Doc.create(command.docId(), command.body());
apply(event);
}
@CommandHandler
public void handle(DocUpdate command) {
apply(it -> it.update(command.body()));
}
}
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public record Doc(
DocId docId,
String body
) implements EventDrivenAggregateRoot {
public static DocCreated create(DocId docId, String body) {
return new DocCreated(docId, body);
}
public static Doc applyEvent(DocCreated event) {
return new Doc(event.docId(), event.body());
}
public DocUpdated update(String body) {
return new DocUpdated(docId, body);
}
@Override
public EventDrivenAggregateRoot applyEvent(DocEvent event) {
return switch (event) {
case DocCreated docCreated -> new Doc(docCreated.docId(), docCreated.body());
case DocUpdated docUpdated -> new Doc(this.docId, docUpdated.body());
default -> throw new IllegalStateException("Unexpected value: " + event);
};
}
}
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Πϕϯτ
ΠϕϯτΛ
ΦϒδΣΫτͰ
ఆٛ͢Δ
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public record DocCreated(
DocId docId,
String body
) implements DocEvent {
}
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ϦʔυϞσϧ
8FCͰσʔλͱͯ͠
༻ҙ͢ΔͳΒ
(FUͷ8FC"1*ͱ
σʔλऔಘॲཧ
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@GetMapping("{docsId}")
public DocsGetResponse get(@PathVariable UUID docsId) throws ExecutionException,
InterruptedException {
var query = new GetDoc(docsId);
var result = queryGateway.query(query, GetDocResult.class).get();
var docDataModel = result.docDataModel().orElseThrow(NotFoundException::new);
return new DocsGetResponse(docsId, docDataModel.getBody(),
docDataModel.getEffectiveCount());
}
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@Service
public record DocQueryService(QueryGateway queryGateway, DocRepository repository) {
@QueryHandler
public GetDocResult handle(GetDoc query) {
return new GetDocResult(repository.findById(query.docId().toString()));
}
}
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@Repository
public interface DocRepository extends JpaRepository {
}
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@Component
public class DocProjection {
private final DocRepository repository;
public DocProjection(DocRepository repository) {
this.repository = repository;
}
@EventHandler
public void on(DocCreated event) {
var doc = new DocDataModel();
doc.setDocId(event.docId().asString());
doc.setBody(event.body());
repository.save(doc);
}
@EventHandler
public void on(DocUpdated event) {
var doc = repository.findById(event.docId().asString()).orElseThrow();
doc.setBody(event.body());
repository.save(doc);
}
:
}
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ϙϦγʔ
ΠϕϯτϋϯυϥʔͰ
༻ҙ͞ΕΔ
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@EventHandler
public void on(AlbumCreated event) {
if (!event.photos.isEmpty()) {
commandGateway.send(new AddPhotos(event.albumId, event.photos))
}
}
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֎෦γεςϜ
ίϚϯυϋϯυϥʔ
ʴ
ഊࢭ
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@CommandHandler
public void handle(MakePayment command) {
var result = paymentService.makePayment(command.accountId(), command.amount());
if (result.isSuccessful()) {
eventGateway.publish(
new PaymentSucceeded(command.paymentId(), result.getTransactionId()));
} else {
eventGateway.publish(
new PaymentFailed(command.paymentId(), result.getFailureReason()));
}
}
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Πϕϯτετʔϛϯά
ਤͷ࣮
"*࣌ͷίʔσΟϯά
"*ʹΑΔΠϕϯτετʔϛϯάਤ͔Βͷίʔυੜ
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"*ͬͯͳౕ͍͍Δʁ
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͍Ͷ͐Αͳ͊ʂʂʁ
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"*ͷಛੑʢ͍·͞Β͕ͩʜʜʣ
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ίϯςΩετΟϯυ
$POUFYU3PU
-PTUJOUIF.JEEMF
ສτʔΫϯೖΔ
ʺ
ສτʔΫϯΛཧղ͢Δ
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l ܇࿅σʔλʹͳ͍ใΛٻΊΒΕͨͱ͖
l ࠷৽"1*
l ࣾن
l ͍͋·͍ͳࢦࣔΛड͚ͨͱ͖
l ʮ͍͍ײ͡ʹͯ͠ʯ
l จ຺͕ෆ͍ͯ͠Δͱ͖
l ෳͷղऍ͕Մೳͳ࣭
ϋϧγωʔγϣϯΛى͍͜͢͠ঢ়گ
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͓હཱͯɿίϯςΩετΟϯυฤ
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ߏԽ͍͍ͧʂ
ߏͰऔࣺબ͕Ͱ͖Δ
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7FSUJDBM4MJDF
ਫฏϨΠϠʔ
ෳσΟϨΫτϦΛ
ԣஅ͍͢͠ͷͰ
ਨʹׂ͢Δͷ͕
ΑΓ(PPE
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͓હཱͯɿϋϧγωʔγϣϯฤ
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ใΛ͢
● ܇࿅σʔλʹͳ͍ͷΛҾ͖͢
#### 2.1. Set-Based Consistency Validationύλʔϯʹ͓͚ΔίϚϯυ
ू࡞લʹ֎෦σʔλʢϦϙδτϦʣΛࢀরͨ͠ݕূ͕ඞཁͳ߹ɺίϚϯυΛ2ͭʹ͢Δɿ
**֎෦ެ։ίϚϯυʢRequest* Commandʣ**:
- **త**: ΫϥΠΞϯτ͔ΒͷϦΫΤετΛड͚औΓɺݕূΛ࣮ࢪ
- **໋໊نଇ**: `Request{໊ࢺ}Command` (ྫ: `RequestReservationSlotCommand`)
- **Ξϊςʔγϣϯ**: `@RoutingKey` - Application ServiceʹϧʔςΟϯά
- **ϋϯυϥʔ**: Application Serviceʢ`@Service` + `@CommandHandler`ʣͰॲཧ
- **ྫ**:
```java
public record RequestReservationSlotCommand(
@RoutingKey
String slotId,
String facilityId
// ... ͦͷଞͷϑΟʔϧυ
) {}
```
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બࢶΛ௵͢
ʮΠϕϯτΛ࡞ͬͯʯ͚ͩͩͱ
໋໊ 0SEFS$SFBUFE 0SEFS$SFBUFE&WFOU $SFBUFE0SEFS
Ͳ͜ʹஔ͘ʁ FWFOUT EPNBJOFWFOUT BQJ
● ͍͋·͍ͳࢦࣔΛݻఆ͢Δ
- **໋໊نଇ**: `{໊ࢺ}{ಈࢺաڈࢺ}Event` (ྫ: `FacilityRegisteredEvent`, `ReservationCancelledEvent`)
- **ྫ**: ʮอҭࢪઃ͕ొ͞Εͨʯ→ `FacilityRegisteredEvent`
- **ύοέʔδ**: `com.example.eventsourcing.{context}.api.events`
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ϧʔϧΛఆٛ
● จ຺͕ෆ͍ͯ͠Δͱ͜ΖΛϧʔϧͰΧόʔ
### 1. ΠϕϯτʢΦϨϯδ৭ͷᝦʣ
- **ఆٛ**: γεςϜͰൃੜͨ͠ࣄ࣮ΛաڈܗͰදݱ
- **࣮**: ֤Bounded Contextͷ`api/events`ύοέʔδʹrecordͱͯ͠ఆٛ
- **ஔཧ༝**: ଞͷBounded ContextϚΠΫϩαʔϏε͔ΒࢀরՄೳͳެ։API
### σΟϨΫτϦߏ
```
src/main/java/com/example/eventsourcing/
├── {bounded-context}/ # ྫ: facility, parent
│ ├── api/
│ │ └── events/ # ⭐ ެ։ΠϕϯτʢଞαʔϏε͔ΒࢀরՄೳʣ
│ │ └── {Context}Events.java
│ ├── adapter/
│ │ ├── inbound/ # Inbound Adaptersʢೖྗʣ
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͕ΜΓ͗͢ͳ͍
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● ϓϩϯϓτ࡞ΓूதͰͳ͘ੵ
○ ᘳͳϓϩϯϓτΛ࡞Ζ͏ͱ͠ͳ͍
○ ͍ͳ͕ΒҭͯΔ
● มߋͷλΠϛϯάࢦࣔͷத
○ ࢦࣔΛग़͢
○ ˠҙʹ͙ͦΘͳ͍
○ ˠमਖ਼Λ͑Δ
○ ˠͦͷྲྀΕͰNEϑΝΠϧͷमਖ਼ࢦࣔ
ϓϩϯϓτ࡞ΒͤΔͷ
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"*ʹΑΔύϥμΠϜγϑτ
ਤ͕ίʔυʹ
ͳΔʂ
@Service
public class DocumentApplicationService {
private final DocumentRepository documentRepository;
public DocumentApplicationService(DocumentRepository documentRepository) {
this.documentRepository = documentRepository;
}
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ͬͯΈΑ͏ʂ
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