Event Sourcing 101

&WFOU4PVSDJOH !EJTD TIJOKVLVMU

΋͘͡ w എܠ w ࢓૊Έ w αϯϓϧ w ·ͱΊ

r(SFH:PVOH 8IZVTF&WFOU4PVSDJOH IUUQDPEFCFUUFSDPNHSFHZPVOHXIZVTFFWFOUTPVSDJOH ࠓ೔ͷςʔϚ

POFPIPOF ӳޠͰ#BTJD*OUSPEVDUJPO جૅฤɾॳڃฤ

എܠͱϢʔεέʔε w ۚમ΍ސ٬ͱͷཤྺͳͲɺաڈͷ৘ใΛؚΊ࢒͓͖͍ͯͨ͠  w ཁ݅௥Ճ΍ػೳ֦ுͳͲΛ܁Γฦ͢  w ϚΠΫϩαʔϏεͷΑ͏ͳߏ੒Ͱ΋ɺ։ൃεϐʔυɺύϑΥʔϚϯ ε΍εέʔϥϏϦςΟ͸ॏཁ 

എܠͱϢʔεέʔε w ۚમ΍ސ٬ͱͷཤྺͳͲɺաڈͷ৘ใΛؚΊ࢒͓͖͍ͯͨ͠  ܽଛͷڐ͞Εͳ͍σʔλɺϏδωεՁ஋ͷߴ͍σʔλ w ཁ݅௥Ճ΍ػೳ֦ுͳͲΛ܁Γฦ͢  w ϚΠΫϩαʔϏεͷΑ͏ͳߏ੒Ͱ΋ɺ։ൃεϐʔυɺύϑΥʔϚϯ ε΍εέʔϥϏϦςΟ͸ॏཁ 

എܠͱϢʔεέʔε w ۚમ΍ސ٬ͱͷཤྺͳͲɺաڈͷ৘ใΛؚΊ࢒͓͖͍ͯͨ͠  ܽଛͷڐ͞Εͳ͍σʔλɺϏδωεՁ஋ͷߴ͍σʔλ w ཁ݅௥Ճ΍ػೳ֦ுͳͲΛ܁Γฦ͢  มԽͷܹ͍͠ϏδωεϞσϧ w ϚΠΫϩαʔϏεͷΑ͏ͳߏ੒Ͱ΋ɺ։ൃεϐʔυɺύϑΥʔϚϯ ε΍εέʔϥϏϦςΟ͸ॏཁ 

എܠͱϢʔεέʔε w ۚમ΍ސ٬ͱͷཤྺͳͲɺաڈͷ৘ใΛؚΊ࢒͓͖͍ͯͨ͠  ܽଛͷڐ͞Εͳ͍σʔλɺϏδωεՁ஋ͷߴ͍σʔλ w ཁ݅௥Ճ΍ػೳ֦ுͳͲΛ܁Γฦ͢  มԽͷܹ͍͠ϏδωεϞσϧ w ϚΠΫϩαʔϏεͷΑ͏ͳߏ੒Ͱ΋ɺ։ൃεϐʔυɺύϑΥʔϚϯ ε΍εέʔϥϏϦςΟ͸ॏཁ 
ن໛ͷ֦େ

ैདྷͷΞϓϩʔν w ۚમ΍ސ٬ͱͷཤྺͳͲɺաڈͷ৘ใΛؚΊ࢒͓͖͍ͯͨ͠  w มԽଟ͍ϏδωεʹॊೈʹରԠ͍ͨ͠  w ։ൃεϐʔυɺύϑΥʔϚϯε΍εέʔϥϏϦςΟ͸ॏཁ   

ैདྷͷΞϓϩʔν w ۚમ΍ސ٬ͱͷཤྺͳͲɺաڈͷ৘ใΛؚΊ࢒͓͖͍ͯͨ͠  ཤྺςʔϒϧ΍؂ࠪϩά w มԽଟ͍ϏδωεʹॊೈʹରԠ͍ͨ͠  w ։ൃεϐʔυɺύϑΥʔϚϯε΍εέʔϥϏϦςΟ͸ॏཁ   

ैདྷͷΞϓϩʔν w ۚમ΍ސ٬ͱͷཤྺͳͲɺաڈͷ৘ใΛؚΊ࢒͓͖͍ͯͨ͠  ཤྺςʔϒϧ΍؂ࠪϩά w มԽଟ͍ϏδωεʹॊೈʹରԠ͍ͨ͠  ্ཱͪ͛ͷૣ͍ݴޠ΍'8ɺ/P42-ͷΑ͏ͳεΩʔϚϨεετΞ w ։ൃεϐʔυɺύϑΥʔϚϯε΍εέʔϥϏϦςΟ͸ॏཁ   

ैདྷͷΞϓϩʔν w ۚમ΍ސ٬ͱͷཤྺͳͲɺաڈͷ৘ใΛؚΊ࢒͓͖͍ͯͨ͠  ཤྺςʔϒϧ΍؂ࠪϩά w มԽଟ͍ϏδωεʹॊೈʹରԠ͍ͨ͠  ্ཱͪ͛ͷૣ͍ݴޠ΍'8ɺ/P42-ͷΑ͏ͳεΩʔϚϨεετΞ w ։ൃεϐʔυɺύϑΥʔϚϯε΍εέʔϥϏϦςΟ͸ॏཁ  ڞ༗%#ɺ෼ࢄτϥϯβΫγϣϯɺݴޠͳͲͷ౷Ұɺίϯ΢ΣΠ
ͷ๏ଇɺͦ΋ͦ΋෼ׂ͠ͳ͍

Πϕϯτιʔγϯάͷಛ௃ w աڈͷཤྺ Πϕϯτ Λ͢΂ͯอଘ σʔλͷߋ৽͸͠ͳ͍ w ཤྺ͔Βݱࡏঢ়ଶΛ෮ݩ w
৘ใ͕ফࣦ͠ͳ͍ͨΊɺޙ͔ΒϏδωεϩδοΫΛมߋ͠΍͍͢ w ཁ݅Λͦͷ··ιʔείʔυͰදݱ͠΍͍͢ w ֎෦γεςϜ΋ΠϕϯτͷίϯγϡʔϚʹͳΓɺτϥϯβΫγϣϯ΍ґଘؔ܎ ͕ܰݮ w ΠϕϯτετΞͷଞʹݕࡧʹಛԽͨͨ͠͠σʔλετΞ

ਤΛ࢖ͬͯઆ໌

5SBOTBDUJPO4DSJQU

5SBOTBDUJPO4DSJQU Ћ େ͖͘ͳΓա͗Δ

w खଓ͖తͳॲཧ͚ͩͰ͸ɺ࠶ར༻͕೉͍͠ w ॲཧ͕௕͗ͯ͢Θ͔Βͳ͍ w मਖ਼ͷӨڹൣғ͕༧ଌͰ͖ͳ͍

w खଓ͖తͳॲཧ͚ͩͰ͸ɺ࠶ར༻͕೉͍͠ w ॲཧ͕௕͗ͯ͢Θ͔Βͳ͍ w मਖ਼ͷӨڹൣғ͕༧ଌͰ͖ͳ͍ ॲཧ಺༰ʹ໾ׂΛ࣋ͨͤͨઃܭʹ͢Δ

.7$ Ћ ͜ͷล͕ΰνϟΰνϟͯ͘͠Δ 4FSWJDF΍%BPͰղܾ

w ॻ͖ࠐΈܥͷෳࡶੑ w େྔͷ৚݅෼ذ΍ɺෳࡶͳϏδωεϧʔϧɺԋࢉ w ৽نɺԼॻ͖ɺߋ৽ͱ͔Λಉ͡.PEFMͰѻ͏ w ϢʔεέʔεʹΑͬͯOVMM΍ɺόϦσʔγϣϯ͕ҧ͏ w ಡΈࠐΈܥͷෳࡶੑ
w ߋ৽ͷͱ͖͸ϦϨʔγϣϯઌͷ*%͚ͩ͋Ε͹͍͍ w औಘʹ͸*%Ͱ+PJOͨ݁͠Ռ΋΄͍͠ w ୯Ұͷ.PEFMऔಘ͸ৄࡉɺෳ਺.PEFMͷ৔߹͸αϚϦʔ͚ͩ͋Ε͹͍͍

w ॻ͖ࠐΈܥͷෳࡶੑ w େྔͷ৚݅෼ذ΍ɺෳࡶͳϏδωεϧʔϧɺԋࢉ w ৽نɺԼॻ͖ɺߋ৽ͱ͔Λಉ͡.PEFMͰѻ͏ w ϢʔεέʔεʹΑͬͯOVMM΍ɺόϦσʔγϣϯ͕ҧ͏ w ಡΈࠐΈܥͷෳࡶੑ
w ߋ৽ͷͱ͖͸ϦϨʔγϣϯઌͷ*%͚ͩ͋Ε͹͍͍ w औಘʹ͸*%Ͱ+PJOͨ݁͠Ռ΋΄͍͠ w ୯Ұͷ.PEFMऔಘ͸ৄࡉɺෳ਺.PEFMͷ৔߹͸αϚϦʔ͚ͩ͋Ε͹͍͍ ॻ͖ࠐΈͱಡΈࠐΈΛ෼͚Δ

$234 4UBUF4PVSDJOH

$234 4UBUF4PVSDJOH Ћ ͜ͷลʹݶքΛײ͡Δ͕࣌͋Δ

w ۚમ΍ސ٬ͱͷཤྺͳͲɺաڈͷ৘ใΛؚΊ࢒͢ํ๏͕೰·͍͠ w ϏδωεͷมԽͱιʔείʔυͱ%#ͷมߋʹίετΛײ͡Δ w ن໛͕֦େͯ͠ɺ%#ڞ༗΍ύϑΥʔϚϯεɺՄ༻ੑʹݶքΛײ͡Δ

w ۚમ΍ސ٬ͱͷཤྺͳͲɺաڈͷ৘ใΛؚΊ࢒͢ํ๏͕೰·͍͠ w ϏδωεͷมԽͱιʔείʔυͱ%#ͷมߋʹίετΛײ͡Δ w ن໛͕֦େͯ͠ɺ%#ڞ༗΍ύϑΥʔϚϯεɺՄ༻ੑʹݶքΛײ͡Δ Πϕϯτͱঢ়ଶΛ෼཭͢Δ

$234 &WFOU4PVSDJOH

ঃʑʹεςοϓΞοϓ

΋͏গ͠۩ମతʹ

ɹ"YPO'SBNFXPSL w +BWB੡ϑϨʔϜϫʔΫ w IUUQXXXBYPOGSBNFXPSLPSH w Πϕϯτιʔγϯάʹඞཁͳ஌͕ࣝ·ͱ·͍ͬͯΔͨΊษڧ༻్ʹ࠷ద w ΞϊςʔγϣϯϕʔεͰΠϕϯτιʔγϯάཧղʹෆཁͳෳࡶͳ࣮૷Λ ܰݮ
w ࣮੷͸͋·Γฉ͔ͳ͍ͷͰ࣮ӡ༻ʹ࢖͏͔͸ཁݕ౼

αϯϓϧ w BYPOCBOL w IUUQTHJUIVCDPNEJTDBYPOCBOL w "YPO'SBNFXPSLº4QSJOH#PPU w ΠϕϯτιʔγϯάͰۜߦޱ࠲ w
࢓૊ΈΛ஌ΔͨΊͷ࠷খߏ੒

$POUSPMMFS

$POUSPMMFS w ී௨ͷ4QSJOH$POUSPMMFS w ඇಉظॲཧͷͨΊʹ $PNQMFUBCMF'VUVSF @RestController @RequestMapping("/accounts") class BankAccountApi
{ @PostMapping CompletableFuture<String> createAccount(@RequestBody AccountOwner user) { // … } @PutMapping(path = "{accountId}/balance") CompletableFuture<String> deposit(@RequestBody Balance balance, @PathVariable String accountId) { // … } @DeleteMapping("{id}") CompletableFuture<String> delete(@PathVariable String id) { // … } @GetMapping("{id}") CompletableFuture<BankAccountDto> ﬁndById(@PathVariable String id) { // … } }

$PNNBOE(BUFXBZ

$PNNBOE(BUFXBZ w "YPO͕ఏڙ w TFOE ʹΑͬͯ$PNNBOE .PEFMΛૹ৴ @RestController @RequestMapping("/accounts") class
BankAccountApi { CommandGateway commandGateway; @PostMapping CompletableFuture<String> createAccount(@RequestBody AccountOwner user) { String id = UUID.randomUUID().toString(); return commandGateway.send(new CreateAccountCommand(id, user.getName())); } }

$PNNBOE.PEFM

$PNNBOE.PEFM w ৼΔ෣͍Λ࣋ͨͳ͍ී௨ ͷ#FBO w !5BSHFU"HHSFHBUF*EFOUJ pFS͸%PNBJO.PEFMͱର Ԡ class CreateAccountCommand
{ @TargetAggregateIdentiﬁer String id; String accountCreator; } class WithdrawMoneyCommand { @TargetAggregateIdentiﬁer String id; double amount; }

%PNBJO.PEFM

%PNBJO.PEFM w !"HHSFHBUF !"HHSFHBUF*EFOUJpFSͰम০ w !$PNNBOE)BOEMFS w $PNBOOE.PEFMͷॲཧ w BQQMZ
Ͱ&WFOUൃߦ w !&WFOU4PVSDJOH)BOEMFS w &WFOUͷॲཧ w ϏδωεϩδοΫͷू໿ w ݱ࣮ͷཁ݅Λهड़ w ޱ࠲ #BOL"DDPVOU w ޱ࠲ʹೖۚ͢Δ %FQPTJU.POFZ$PNNBOE w ޱ࠲ʹೖۚ͞Εͨ .POFZ%FQPTJUFE&WFOU w υϝΠϯʹෆཁͳॲཧ͸"YPOଆͰࣗಈ࣮ߦ w σʔλ &WFOU ͷอଘ w &WFOUཤྺ͔Βݱࡏঢ়ଶͷ෮ݩ SFQMBZ @Aggregate class BankAccount { @AggregateIdentiﬁer String id; double balance; String owner; @CommandHandler void on(DepositMoneyCommand command) { double amount = command.getAmount(); Assert.isTrue(amount > 0.0, "Deposit must be a positive number."); apply(new MoneyDepositedEvent(id, amount)); } @EventSourcingHandler void on(MoneyDepositedEvent event) { this.balance += event.getAmount(); } }

&WFOU4UPSF

&WFOU4UPSF w "YPO͕ఏڙ w BQQMZ ͞Εͨ&WFOUΛશ ͯอଘ w อଘ͞Εͨ&WFOU͸4USFBN ͱͯ͠औΓग़ͤΔ
&WFOU 4USFBN @RestController @RequestMapping("/accounts") class BankAccountApi { EventStore eventStore; List<Object> getEvents(@PathVariable String id) { return eventStore.readEvents(id).asStream() .map(Message::getPayload) .collect(toList()); } }

&WFOU w ৼΔ෣͍Λ࣋ͨͳ͍ී௨ ͷ#FBO w ໋໊͸׳शతʹաڈܗ class AccountCreatedEvent { String
id; String accountCreator; double balance; }

&WFOU-JTUFOFS

&WFOU-JTUFOFS w !&WFOU)BOEMFS w &WFOUΛड͚औΔ w ݕࡧ༻ͷετΞʹ൓ө w ͦͷଞͷ༻్ʹ΋ class
BankAccountEventListener { BankAccountRepository repository; @EventHandler void on(AccountCreatedEvent event) { BankAccountEntity entity = new BankAccountEntity( event.getId(), event.getBalance(), event.getAccountCreator() ); repository.save(entity); } }

2VFSZ.PEFM

2VFSZ.PEFM w ৼΔ෣͍Λ࣋ͨͳ͍ී௨ ͷ#FBO class BankAccountQuery { String id; }

2VFSZ(BUFXBZ

2VFSZ(BUFXBZ w "YPO͕ఏڙ w RVFSZ ʹΑͬͯ2VFSZ .PEFMΛૹ৴ @RestController @RequestMapping("/accounts") class
BankAccountApi { QueryGateway queryGateway; @GetMapping("{id}") CompletableFuture<BankAccountDto> ﬁndById(@PathVariable String id) { BankAccountQuery query = new BankAccountQuery(id); return queryGateway.query(query, BankAccountDto.class); } }

2VFSZ4FSWJDF

2VFSZ4FSWJDF w υϝΠϯΛ͋·Γҙࣝ͠ͳ ͍खଓ͖తॲཧ w !2VFSZ)BOEMFS w 2VFSZ.PEFMΛऔಘ w ී௨ͷݕࡧ
@Service public class BankAccountQueryService { BankAccountRepository bankAccountRepository; @QueryHandler public BankAccountDto ﬁndById(BankAccountQuery query) { return bankAccountRepository.ﬁndById(query.getId()) .map(BankAccountDto::new).orElseThrow(RuntimeException::new); } }

۩ମతͳ࿩͸͜͜·Ͱ

࣮ફͨ͠ϝϦοτ w ϏδωεϩδοΫ͕υϝΠϯϞσϧʹू໿͞ΕΔ w ϏδωεϩδοΫΛཁ݅௨Γʹૉ௚ʹهड़Ͱ͖Δ w σʔλετΞ΁ͷೖग़ྗ͕γϯϓϧ w ߋ৽͸ΠϕϯτͷJOTFSU͚ͩ w
ݕࡧ͕ඞཁͰ͋Ε͹༻్ʹ߹Θͤͯ௥Ճ w ύϑΥʔϚϯε΍Մ༻ੑ୲อ͕͠΍͍͢

σϝϦοτ w جຊతʹ೉͍͠ ͦ΋ͦ΋ෳࡶͳཁ݅ʹରԠ͢ΔͨΊͷखஈ w ઃܭ΍࣮૷ελΠϧͷύϥμΠϜγϑτ w ݁Ռ੔߹ੑͷରԠ w
Πϯϑϥͷߏங

σϝϦοτ w جຊతʹ೉͍͠ ͦ΋ͦ΋ෳࡶͳཁ݅ʹରԠ͢ΔͨΊͷखஈ w ઃܭ΍࣮૷ελΠϧͷύϥμΠϜγϑτ w ݁Ռ੔߹ੑͷରԠ w
Πϯϑϥͷߏங ۜͷ஄ؙͰ͸ͳ͍ɺඅ༻ରޮՌΛߟ͑ͯ൑அ

·ͱΊ ઃܭʹ՝୊Λײͨ͡ͱ͖ ΠϕϯτιʔγϯάΛߟ͑ͯΈΑ͏

Event Sourcing 101

Event Sourcing 101

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