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Object Oriented Diversity
Masanobu Naruse
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あなたのオブジェクト指向は何ですか
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オブジェクト指向
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なんか違う
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それ
オブジェクト指向
じゃないよ
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それ
オブジェクト指向
じゃないよ
いや
オブジェクト指向
だよ
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それ
オブジェクト指向
じゃないよ
いや
オブジェクト指向
だよ
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それ
オブジェクト指向
じゃないよ
いや
オブジェクト指向
だよ
C++ Smalltalk
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それ
オブジェクト指向
じゃないよ
いや
オブジェクト指向
だよ
抽象データ型
メッセージ
パッシング
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Object Oriented Diversity
Masanobu Naruse
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Object Oriented Diversity
Masanobu Naruse
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Diversity
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多様性
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多様性を上手く扱うには？
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多様性を上手く扱うには？
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多様性
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Polymorphism
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オブジェクト指向プログラミングを見てみよう！
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public class ProposalSubmitService
{
private readonly IProposalRepository proposalRepository;
public ProposalSubmitService(IProposalRepository proposalRepository)
{
this.proposalRepository = proposalRepository;
}
public void Handle(ProposalSubmitCommand command)
{
...
var proposal = new Proposal(command.Title, command.Outline);
proposalRepository.Save(proposal);
...
}
}
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public class ProposalSubmitService
{
private readonly IProposalRepository proposalRepository;
public ProposalSubmitService(IProposalRepository proposalRepository)
{
this.proposalRepository = proposalRepository;
}
public void Handle(ProposalSubmitCommand command)
{
...
var proposal = new Proposal(command.Title, command.Outline);
proposalRepository.Save(proposal);
...
}
}
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public class ProposalSubmitService
{
private readonly IProposalRepository proposalRepository;
public ProposalSubmitService(IProposalRepository proposalRepository)
{
this.proposalRepository = proposalRepository;
}
public void Handle(ProposalSubmitCommand command)
{
...
var proposal = new Proposal(command.Title, command.Outline);
proposalRepository.Save(proposal);
...
}
}
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public class ProposalSubmitService
{
private readonly IProposalRepository proposalRepository;
public ProposalSubmitService(IProposalRepository proposalRepository)
{
this.proposalRepository = proposalRepository;
}
public void Handle(ProposalSubmitCommand command)
{
...
var proposal = new Proposal(command.Title, command.Outline);
proposalRepository.Save(proposal);
...
}
}
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public class ProposalSubmitService
{
private readonly IProposalRepository proposalRepository;
public ProposalSubmitService(IProposalRepository proposalRepository)
{
this.proposalRepository = proposalRepository;
}
public void Handle(ProposalSubmitCommand command)
{
...
var proposal = new Proposal(command.Title, command.Outline);
proposalRepository.Save(proposal);
...
}
}
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public interface IProposalRepository
{
Proposal Find(ProposalId id);
void Save(Proposal proposal);
void Delete(Proposal proposal);
}
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public interface IProposalRepository
{
Proposal Find(ProposalId id);
void Save(Proposal proposal);
void Delete(Proposal proposal);
}
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public class ProposalSubmitService
{
private readonly IProposalRepository proposalRepository;
public ProposalSubmitService(IProposalRepository proposalRepository)
{
this.proposalRepository = proposalRepository;
}
public void Handle(ProposalSubmitCommand command)
{
...
var proposal = new Proposal(command.Title, command.Outline);
proposalRepository.Save(proposal);
...
}
}
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public class ProposalSubmitService
{
private readonly IProposalRepository proposalRepository;
public ProposalSubmitService(IProposalRepository proposalRepository)
{
this.proposalRepository = proposalRepository;
}
public void Handle(ProposalSubmitCommand command)
{
...
var proposal = new Proposal(command.Title, command.Outline);
proposalRepository.Save(proposal);
...
}
}
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public class ProposalSubmitService
{
private readonly IProposalRepository proposalRepository;
public ProposalSubmitService(IProposalRepository proposalRepository)
{
this.proposalRepository = proposalRepository;
}
public void Handle(ProposalSubmitCommand command)
{
...
var proposal = new Proposal(command.Title, command.Outline);
proposalRepository.Save(proposal);
...
}
}
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public void Main(string input)
{
var repository = CreateRepository(input);
var proposalSubmitService = new ProposalSubmitService(repository);
var command = new ProposalSubmitCommand();
proposalSubmitService.Handle(command);
}
private IProposalRepository CreateRepository(string input)
{
switch (input)
{
case "local" :
return new InMemoryProposalRepository();
case "production" :
return new SqlProposalRepository();
default:
throw new ArgumentOutOfRangeException();
}
}
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public void Main(string input)
{
var repository = CreateRepository(input);
var proposalSubmitService = new ProposalSubmitService(repository);
var command = new ProposalSubmitCommand();
proposalSubmitService.Handle(command);
}
private IProposalRepository CreateRepository(string input)
{
switch (input)
{
case "local" :
return new InMemoryProposalRepository();
case "production" :
return new SqlProposalRepository();
default:
throw new ArgumentOutOfRangeException();
}
}
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public void Main(string input)
{
var repository = CreateRepository(input);
var proposalSubmitService = new ProposalSubmitService(repository);
var command = new ProposalSubmitCommand();
proposalSubmitService.Handle(command);
}
private IProposalRepository CreateRepository(string input)
{
switch (input)
{
case "local" :
return new InMemoryProposalRepository();
case "production" :
return new SqlProposalRepository();
default:
throw new ArgumentOutOfRangeException();
}
}
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public void Main(string input)
{
var repository = CreateRepository(input);
var proposalSubmitService = new ProposalSubmitService(repository);
var command = new ProposalSubmitCommand();
proposalSubmitService.Handle(command);
}
private IProposalRepository CreateRepository(string input)
{
switch (input)
{
case "local" :
return new InMemoryProposalRepository();
case "production" :
return new SqlProposalRepository();
default:
throw new ArgumentOutOfRangeException();
}
}
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public void Main(string input)
{
var repository = CreateRepository(input);
var proposalSubmitService = new ProposalSubmitService(repository);
var command = new ProposalSubmitCommand();
proposalSubmitService.Handle(command);
}
private IProposalRepository CreateRepository(string input)
{
switch (input)
{
case "local" :
return new InMemoryProposalRepository();
case "production" :
return new SqlProposalRepository();
default:
throw new ArgumentOutOfRangeException();
}
}
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オブジェクト指向
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public interface オブジェクト指向
{
}
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それ
オブジェクト指向
じゃないよ
いや
オブジェクト指向
だよ
C++ Smalltalk
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コードを小説として捉えたとき
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Polymorphism の役割は？
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文脈
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コンテキスト
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IT技術分野には多くのコンテキストがある
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モデル
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エンティティ
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ドメイン
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コンテキストが存在することを意識しよう
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プログラミングでも便利
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UserContext
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HttpContext
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コンテキストを恐れないで
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重要なのはどのコンテキストなのかを意識すること
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多様性を受け入れよう
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多様性を恐れないための心構え
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あなたの考えを
あなたのコンテキストで
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Object Oriented Diversity
Masanobu Naruse
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Auther Masanobu Naruse
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Twitter @nrslib