/// <summary>
/// 通过订阅者位置移除订阅者
/// </summary>
/// <param name="position">订阅者位置</param>
/// <returns>结果</returns>
public async Task<bool> RemoveSubsriberAt(int position)
{
if (position < 0 || position > instance.SubscriberList.Count)
{
return false;
}
Subscriber subscriber = instance.SubscriberList[position];
Topic removedTopic = GetTopicByName(subscriber.TopicName);
//订阅者列表更新
instance.SubscriberList.Remove(subscriber);
//数据库更新
SubscriberController subscriberController = new SubscriberController(db.Subscribers);
subscriberController.SetSubscriber(subscriber);
subscriberController.DeleteSubscriber();
//话题列表更新
instance.TopicList.Remove(removedTopic);
//数据库更新
TopicController topicController = await GetTopicController(removedTopic);
topicController.DeleteTopic();
//向服务器请求删除订阅者
client.RemoveSubscriber(subscriber);
//移除成功返回真
return true;
}
/// <summary>
/// 增加订阅者（群组话题使用）
/// </summary>
/// <param name="subsricber">订阅者对象</param>
/// <returns>结果</returns>
public async Task <bool> AddSubscriber(Subscriber subscriber)
{
//判断订阅者是否位于订阅者列表中
if (instance.SubsriberList.Contains(subscriber))
{
//重复添加返回假
return(false);
}
subscriber.TopicName = instance.Name;
instance.SubsriberList.Add(subscriber);
//调用订阅者控制器更新订阅者
SubscriberController subscriberController = new SubscriberController(db.Subscribers);
subscriberController.SetSubscriber(subscriber);
subscriberController.UpsertSubscriber();
//更新话题时间戳
instance.LastUsed = ChatMessageBuilder.GetTimeStamp();
var dbContext = db.Topics.GetRepository();
await dbContext.UpsertTopic(instance);
//添加成功返回真
return(true);
}
/// <summary>
/// 移除订阅者
/// </summary>
/// <param name="subscriber">订阅者对象</param>
/// <returns>结果</returns>
public async Task<bool> RemoveSubscriber(Subscriber subscriber)
{
//判断订阅者是否位于订阅者列表中
if (!instance.SubscriberList.Contains(subscriber))
{
return false;
}
Topic removedTopic = GetTopicByName(subscriber.TopicName);
//订阅者列表更新
instance.SubscriberList.Remove(subscriber);
//数据库更新
SubscriberController subscriberController = new SubscriberController(db.Subscribers);
subscriberController.SetSubscriber(subscriber);
subscriberController.DeleteSubscriber();
//话题列表更新
instance.TopicList.Remove(removedTopic);
//数据库更新
TopicController topicController = await GetTopicController(removedTopic);
topicController.DeleteTopic();
//向服务器请求删除订阅者
client.RemoveSubscriber(subscriber);
return true;
}
/// <summary>
/// 通过订阅者获取订阅者控制器
/// </summary>
/// <param name="subscriber">订阅者</param>
/// <returns>订阅者控制器</returns>
public SubscriberController GetSubscriberController(Subscriber subscriber)
{
if (subscriber == null)
{
return null;
}
SubscriberController subscriberController = new SubscriberController(db.Subscribers);
subscriberController.SetSubscriber(subscriber);
return subscriberController;
}
/// <summary>
/// 订阅者状态改变
/// </summary>
/// <param name="sender">发送者</param>
/// <param name="args">订阅者状态改变参数</param>
private void SubscriberStateChanged(object sender, SubscriberStateChangedEventArgs args)
{
//获取拥有完整信息的订阅者
Subscriber subscriber = GetSubscriberByUserId(args.Subscriber.UserId);
if (subscriber != null)
{
SubscriberController subscriberController = GetSubscriberController(subscriber);
//调用更改订阅者状态方法
subscriberController.ChangeSubscriberState(args.IsOnline);
}
}
/// <summary>
/// 设置用户数据库
/// </summary>
/// <param name="database">数据库</param>
/// <returns></returns>
public async Task SetDatabase(IAccountRepository database)
{
db = database;
//获取控制器
SubscriberController subscriberController = new SubscriberController(database.Subscribers);
TopicController topicController = new TopicController(database);
//填充数据
instance.SubscriberList = await subscriberController.GetSubscribers();
instance.TopicList = await topicController.GetTopics();
}
/// <summary>
/// 新增订阅者
/// </summary>
/// <param name="subscriber">订阅者对象</param>
/// <param name="isTemporary">是否临时保存</param>
/// <returns>结果</returns>
public async Task<bool> AddSubscriber(Subscriber subscriber, bool isTemporary = false)
{
//判断是否为有效订阅者
if (instance.SubscriberList.Contains(subscriber) || subscriber.TopicName == "fnd" || subscriber.TopicName == "me")
{
//无效订阅者返回假
return false;
}
//判断是否为临时查询
if (isTemporary == true)
{
if (searchSubscriberResult.Contains(subscriber))
{
return false;
}
searchSubscriberResult.Add(subscriber);
return true;
}
//获取已存在话题或创建话题
Topic newTopic = GetTopicByName(subscriber.TopicName);
if (newTopic == null)
{
newTopic = new Topic(subscriber.TopicName);
}
if (newTopic == null)
{
newTopic = new Topic(subscriber.TopicName);
}
//话题列表更新
await AddTopic(newTopic);
//数据库更新
TopicController topicController = await GetTopicController(newTopic);
topicController.UpsertTopic();
//订阅者列表更新
instance.SubscriberList.Add(subscriber);
//数据库更新
SubscriberController subscriberController = new SubscriberController(db.Subscribers);
subscriberController.SetSubscriber(subscriber);
subscriberController.UpsertSubscriber();
//服务器更新
client.SubscribeTopic(newTopic);
return true;
}
/// <summary>
/// 设置话题对象
/// </summary>
/// <param name="topic">话题</param>
/// <returns></returns>
public async Task SetTopic(Topic topic)
{
instance = topic;
//初始化消息列表
MessageController messageController = new MessageController(db.Messages);
List <ChatMessage> messages = await messageController.GetMessages(instance, instance.Limit);
messages.ForEach(async m => await AddMessage(m));
//初始化话题订阅者列表
SubscriberController subscriberController = new SubscriberController(db.Subscribers);
instance.SubsriberList = await subscriberController.GetSubscribers(instance);
}
/// <summary>
/// 移除订阅者（群组话题使用）
/// </summary>
/// <param name="subscriber">订阅者对象</param>
/// <returns>结果</returns>
public async Task <bool> RemoveSubscriber(Subscriber subscriber)
{
//判断订阅者是否位于订阅者列表中
if (!instance.SubsriberList.Contains(subscriber))
{
//订阅者不存在返回假
return(false);
}
instance.SubsriberList.Remove(subscriber);
//调用订阅者控制器删除订阅者
SubscriberController subscriberController = new SubscriberController(db.Subscribers);
subscriberController.SetSubscriber(subscriber);
subscriberController.DeleteSubscriber();
//更新话题时间戳
instance.LastUsed = ChatMessageBuilder.GetTimeStamp();
var dbContext = db.Topics.GetRepository();
await dbContext.UpsertTopic(instance);
//删除成功返回真
return(true);
}
/// <summary>
/// 获取订阅者控制器
/// </summary>
/// <returns>订阅者控制器</returns>
public SubscriberController GetSubscriberController()
{
SubscriberController subscriberController = new SubscriberController(db.Subscribers);
return subscriberController;
}
