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using System;
using System.Threading.Tasks;
namespace Timeline.Services.User
{
/// <summary>
/// This service provide some basic user features, which should be used internally for other services.
/// </summary>
public interface IBasicUserService
{
/// <summary>
/// Check if a user exists.
/// </summary>
/// <param name="id">The id of the user.</param>
/// <returns>True if exists. Otherwise false.</returns>
Task<bool> CheckUserExistenceAsync(long id);
/// <summary>
/// Get the user id of given username.
/// </summary>
/// <param name="username">Username of the user.</param>
/// <returns>The id of the user.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="username"/> is null.</exception>
/// <exception cref="ArgumentException">Thrown when <paramref name="username"/> is of bad format.</exception>
/// <exception cref="EntityNotExistException">Thrown when the user with given username does not exist.</exception>
Task<long> GetUserIdByUsernameAsync(string username);
/// <summary>
/// Get the username modified time of a user.
/// </summary>
/// <param name="userId">User id.</param>
/// <returns>The time.</returns>
/// <exception cref="EntityNotExistException">Thrown when user does not exist.</exception>
Task<DateTime> GetUsernameLastModifiedTimeAsync(long userId);
}
}
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