/// <summary>
/// 订阅话题
/// </summary>
/// <param name="topic">话题</param>
/// <returns>结果</returns>
public async Task<bool> AddTopic(Topic topic)
{
if (instance.TopicList.Contains(topic) || topic.Name.Equals("me") || topic.Name.Equals("fnd"))
{
return false;
}
//话题列表更新
instance.TopicList.Add(topic);
//数据库更新
TopicController topicController = await GetTopicController(topic);
topicController.UpsertTopic();
return true;
}
/// <summary>
/// 取消置顶话题
/// </summary>
/// <param name="topic">话题</param>
/// <returns>结果</returns>
public async Task<bool> UnpinTopic(Topic topic)
{
if (!instance.TopicList.Contains(topic) || topic.Weight == 0)
{
return false;
}
//权重置为0
topic.Weight = 0;
//数据库更新
TopicController topicController = await GetTopicController(topic);
topicController.UpsertTopic();
return true;
}
/// <summary>
/// 移动话题
/// </summary>
/// <param name="topic">话题</param>
/// <returns></returns>
public async Task<bool> MoveTopic(Topic topic)
{
if (!instance.TopicList.Contains(topic))
{
return false;
}
//话题列表更新
int oldPosition = instance.TopicList.IndexOf(topic);
instance.TopicList.RemoveAt(oldPosition);
instance.TopicList.Insert(0, topic);
//数据库更新
TopicController topicController = await GetTopicController(topic);
topicController.UpsertTopic();
return true;
}
/// <summary>
/// 通过话题获取话题控制器
/// </summary>
/// <param name="topic">话题</param>
/// <returns>话题控制器</returns>
public async Task<TopicController> GetTopicController(Topic topic)
{
if (topic == null)
{
return null;
}
//获取或创建控制器
TopicController topicController;
if (topicControllerDictionary.TryGetValue(topic.Name, out topicController) == false)
{
client.SubscribeTopic(topic);
topicController = new TopicController(db);
await topicController.SetTopic(topic);
topicControllerDictionary.TryAdd(topic.Name, topicController);
}
return topicController;
}
/// <summary>
/// 通过话题名获取话题控制器
/// </summary>
/// <param name="name">话题名</param>
/// <returns>话题控制器</returns>
public async Task<TopicController> GetTopicControllerByName(string name)
{
int index = instance.TopicList.IndexOf(new Topic(name));
if (index == -1)
{
return null;
}
//获取或创建控制器
TopicController topicController;
if (topicControllerDictionary.TryGetValue(name, out topicController) == false)
{
client.SubscribeTopic(instance.TopicList[index]);
topicController = new TopicController(db);
await topicController.SetTopic(instance.TopicList[index]);
topicControllerDictionary.TryAdd(name, topicController);
}
return topicController;
}
/// <summary>
/// 移除话题
/// </summary>
/// <param name="topic">话题</param>
/// <returns>结果</returns>
public async Task<bool> RemoveTopic(Topic topic)
{
if (!instance.TopicList.Contains(topic))
{
return false;
}
instance.TopicList.Remove(topic);
topic.IsArchived = true;
//数据库更新
TopicController topicController = await GetTopicController(topic);
topicController.UpsertTopic();
//话题列表更新
instance.TopicList.Remove(topic);
//服务器更新
client.RemoveTopic(topic);
return true;
}
/// <summary>
/// 通过话题位置移除话题
/// </summary>
/// <param name="position">话题位置</param>
/// <returns>结果</returns>
public async Task<bool> RemoveTopicAt(int position)
{
if (position < 0 || position > instance.TopicList.Count)
{
return false;
}
Topic topic = instance.TopicList[position];
topic.IsArchived = true;
//数据库更新
TopicController topicController = await GetTopicController(topic);
topicController.DeleteTopic();
//话题列表更新
instance.TopicList.Remove(topic);
//服务器更新
client.RemoveTopic(topic);
return true;
}
/// <summary>
/// 获取话题控制器
/// </summary>
/// <returns>订阅者控制器</returns>
public TopicController GetTopicController()
{
TopicController topicController = new TopicController(db);
return topicController;
}