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¥ããã record åã䜿ãããšã§ãã€ãã¥ãŒã¿ãã«ãªãã¡ã€ã³ã¯ã©ã¹ããã€ã©ãŒãã¬ãŒãã³ãŒããªãã§å®çŸããŠããŸãã package com.example.domain; // ãã©ã³å€æŽã®ããžãã¹ããžãã¯ããã©ã³ãåããã©ããå€å®ããŸãã public record PlanChangeApplication(String contractNumber, String changedPlan) { public boolean isSamePlan(Contract existingContract) { return plan.equals(existingContract.plan()); } } package com.example.domain; // ãã©ã³å€æŽã€ãã³ããå¥çŽçªå·ãšãã©ã³åãæã£ãŠããŸãã public record PlanChangedEvent(String contractNumber, String changedPlan) {} package com.example.domain; // å¥çŽããã©ã³åãæã£ãŠããŸãã public record Contract(String plan) { public PlanChangedEvent changePlan(PlanChangeApplication application) { return new PlanChangedEvent(application.contractNumber(), application.plan()); } } ã€ã±ãŠãªãã¢ããªã±ãŒã·ã§ã³å±€ package com.example.applicationservice; // ãã©ã³å€æŽã®ã¢ããªã±ãŒã·ã§ã³ãµãŒãã¹ãäºåæ¡ä»¶ã確èªããŠOKãªãããŒã¿ããŒã¹ãžä¿åããŸãã public class PlanChangeService { public String change(PlanChangeApplication application) { Optional<Contract> existingContract = contractRepository.find(application.contractNumber); if (existingContract.isEmpty()) { return "Error: å¥çŽããããŸãã" ; } if (application.isSamePlan(existingContract.get())) { return "Error: åããã©ã³ã«å€æŽã§ããŸãã" ; } PlanChangedEvent event = existingContract.get().changePlan(application); contractRepository.persist(event); return "Ok: " + event.changedPlan() + " ã«å€æŽãããŸãã" ; } } ã¢ããªã±ãŒã·ã§ã³ãµãŒãã¹ã§ãã PlanChangeService ã® change ã¡ãœããã§ã¯ããã¡ã€ã³ãªããžã§ã¯ãã§ãã PlanChangeApplication ã Contract ã®ã¡ãœããã䜿ã£ãŠãšã©ãŒãã§ãã¯ãããšã©ãŒããªãã£ãå Žåã«ã¯ ContractRepository ã䜿ã£ãŠã€ãã³ããæ°žç¶åããŸãã ãã® change ã¡ãœããã¯æ¯èŒçé·ãããžãã¯ã«ãªã£ãŠããŠè¯ããªãåããããŸããã©ããããšãã«ãã©ã³å€æŽãå¯èœãã¯ãã¡ã€ã³ã®ç¥èã§ããã¹ãã§ãããã¢ããªã±ãŒã·ã§ã³ãµãŒãã¹ã«æŒãåºããŠããããšã課é¡ã§ãã ããžãã¯ããã¡ã€ã³ã«å¯ãã ãã¡ã€ã³ã§åä»åŠçãå®è£
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ããåã¯ããã«åºãŠãã Changed ãš Error ãããªãããšã衚çŸããŠããŸãã ãã®ãããªãããã€ãã®ç°ãªãåãçµã¿åãããŠã§ããåã代æ°çããŒã¿åãšåŒã³ãŸãã ãŸãããã§ã® Changed ã Error ã®ããã«ä»£æ°çããŒã¿åãåãåŸãå€ã®çš®é¡ãããŒã¿æ§ç¯åãšåŒã³ãŸãã 代æ°çããŒã¿åã«ãã£ãŠããã®ãããªããã§ãã¯ã«å€±æããå Žåã¯ãšã©ãŒã³ãŒããæã¡ãæåããå Žåã«ã¯ PlanChangedEvent ãæã€ãåã衚çŸã§ããŸãã ãªããšã©ãŒã³ãŒã㯠PlanChangeError ãšãã enum ã§è¡šçŸããããšã«ããŸãã package com.example.domain; public enum PlanChangeError [ CONTRACT_NOT_FOUND( "å¥çŽããããŸãã" ), SAME_PLAN( "åããã©ã³ã«å€æŽã§ããŸãã" ); private final String message; PlanChangeError(String message) { this .message = message; } String message() { return message; } } åä»ãã€ã¡ãŒãžãã PlanChangeReception ãšãããã¡ã€ã³ãµãŒãã¹ãäœããPlanChangeResult ãè¿ãããã«ããŠã¿ãŸãã ãã¡ã€ã³ãµãŒãã¹ã§ã¯ãªããžããªã«ã¢ã¯ã»ã¹ãã¹ãã§ãªãããããªããžããªããååŸããŠãã existingContract ã¯åŒæ°ã§åãåãããã«ããŸãã package com.example.domain; public class PlanChangeReception { public PlanChangeResult apply( PlanChangeApplication application, Optional<Contract> existingContract) { return existingContract.map( contract -> application.isSamePlan(contract) ? new PlanChangeResult.Error(PlanChangeError.SAME_PLAN) : new PlanCHangeResult.Changed(contract.changePlan(application)) ).orElseGet( () -> new PlanChangeResult.Error(PlanChangeError.CONTRACT_NOT_FOUND) ); } } ããã«ãã£ãŠãã¢ããªã±ãŒã·ã§ã³å±€ã«ãã£ããã§ãã¯ã®ããã®åå²ããªããªããŸãã fold ã䜿ã£ãŠã¢ããªã±ãŒã·ã§ã³ãµãŒãã¹ãå®è£
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