deps.java

deps.java

class Customer1 {
  void change(String password);
}

class Customer2 {
  void change(Password password) {
    
  }
}

interface Password {
  String raw();
}

class VaultPassword implements Password {

    private final Vault vault;
    private final Supplier<String> password;
    
    public VaultPassword(Vault vault) {
      this.vault = vault;
      this.password = Suppliers.memoize(vault::verySecurePassword());
    }

    @Override
    public String raw() {
      return password.get();
    }
}
                                        
class Vault {
    public void verySecurePassword() {
        // remote call! omg omg omg!
    }
}