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public interface LoginCredential
{
    String getUserId();

    void setUserId(String userId);

    Credential getCredential();

    void setCredential(Credential credential);

    void invalidate();
}

public interface AuthenticatorSelector
{
    Class<? extends Authenticator> getAuthenticatorClass();

    void setAuthenticatorClass(Class<? extends Authenticator> authenticatorClass);

    String getAuthenticatorName();

    void setAuthenticatorName(String authenticatorName);
    
    Authenticator getSelectedAuthenticator();
}