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책임 연쇄 패턴

선택한 두 보관본의 본문 변경입니다. 코드는 실행하지 않습니다.

변경 구간 2개

− 삭제+ 추가변경 없는 본문 22개는 생략했습니다.

본문 블록 14 → 14

using System; using System.Collections.Generic; using System.Linq; Handler chain = new BillingHandler(new TechHandler(null)); Reply result = chain.Handle(new Ticket("billing")); Console.WriteLine(result.Handled + ": " + result.Message); sealed record Ticket(string Kind); sealed record Reply(bool Handled, string Message); abstract class Handler(Handler? next) { public Reply Handle(Ticket ticket) { Reply? result = TryHandle(ticket); if (result is not null) return result; return next?.Handle(ticket) ?? new Reply(false, "unhandled: " + ticket.Kind); } protected abstract Reply? TryHandle(Ticket ticket); } sealed class BillingHandler(Handler? next) : Handler(next) { protected override Reply? TryHandle(Ticket ticket) => ticket.Kind == "billing" ? new Reply(true, "billing desk") : null; } sealed class TechHandler(Handler? next) : Handler(next) { protected override Reply? TryHandle(Ticket ticket) => ticket.Kind == "technical" ? new Reply(true, "technical desk") : null; }

using System; using System.Collections.Generic; using System.Linq; Handler chain = new BillingHandler(new TechHandler(null)); Reply result = chain.Handle(new Ticket("billing")); Console.WriteLine(result.Handled + ": " + result.Message); sealed record Ticket(string Kind); sealed record Reply(bool Handled, string Message); abstract class Handler(Handler? next) { public Reply Handle(Ticket ticket) { Reply? result = TryHandle(ticket); if (result is not null) return result; // null은 이 처리자의 담당이 아니라는 뜻이므로 다음 처리자로 넘긴다. // 다음 처리자도 없으면 체인 전체의 미처리를 Handled=false로 반환한다. return next?.Handle(ticket) ?? new Reply(false, "unhandled: " + ticket.Kind); } protected abstract Reply? TryHandle(Ticket ticket); } sealed class BillingHandler(Handler? next) : Handler(next) { protected override Reply? TryHandle(Ticket ticket) => ticket.Kind == "billing" ? new Reply(true, "billing desk") : null; } sealed class TechHandler(Handler? next) : Handler(next) { protected override Reply? TryHandle(Ticket ticket) => ticket.Kind == "technical" ? new Reply(true, "technical desk") : null; }

본문 블록 19 → 19

using System; using System.Collections.Generic; using System.Linq; Handler chain = new BillingHandler(new TechHandler(null)); foreach (string kind in new[] { "technical", "other" }) { Reply result = chain.Handle(new Ticket(kind)); Console.WriteLine(result.Handled + ": " + result.Message); } sealed record Ticket(string Kind); sealed record Reply(bool Handled, string Message); abstract class Handler(Handler? next) { public Reply Handle(Ticket ticket) { Reply? result = TryHandle(ticket); if (result is not null) return result; return next?.Handle(ticket) ?? new Reply(false, "unhandled: " + ticket.Kind); } protected abstract Reply? TryHandle(Ticket ticket); } sealed class BillingHandler(Handler? next) : Handler(next) { protected override Reply? TryHandle(Ticket ticket) => ticket.Kind == "billing" ? new Reply(true, "billing desk") : null; } sealed class TechHandler(Handler? next) : Handler(next) { protected override Reply? TryHandle(Ticket ticket) => ticket.Kind == "technical" ? new Reply(true, "technical desk") : null; }

using System; using System.Collections.Generic; using System.Linq; Handler chain = new BillingHandler(new TechHandler(null)); foreach (string kind in new[] { "technical", "other" }) { Reply result = chain.Handle(new Ticket(kind)); Console.WriteLine(result.Handled + ": " + result.Message); } sealed record Ticket(string Kind); sealed record Reply(bool Handled, string Message); abstract class Handler(Handler? next) { public Reply Handle(Ticket ticket) { Reply? result = TryHandle(ticket); if (result is not null) return result; // null은 이 처리자의 담당이 아니라는 뜻이므로 다음 처리자로 넘긴다. // 다음 처리자도 없으면 체인 전체의 미처리를 Handled=false로 반환한다. return next?.Handle(ticket) ?? new Reply(false, "unhandled: " + ticket.Kind); } protected abstract Reply? TryHandle(Ticket ticket); } sealed class BillingHandler(Handler? next) : Handler(next) { protected override Reply? TryHandle(Ticket ticket) => ticket.Kind == "billing" ? new Reply(true, "billing desk") : null; } sealed class TechHandler(Handler? next) : Handler(next) { protected override Reply? TryHandle(Ticket ticket) => ticket.Kind == "technical" ? new Reply(true, "technical desk") : null; }