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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| using System; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using System.Text; | ||
| using System.Threading.Tasks; | ||
|
|
||
| using DigitalPlatform.SIP.Server; | ||
|
|
||
| namespace dp2Capo | ||
| { | ||
| /// <summary> | ||
| /// 登录信息缓存机制。避免高密度的登录操作过度耗费 CPU 资源 | ||
| /// </summary> | ||
| public class LoginCache | ||
| { | ||
| Hashtable _table = new Hashtable(); | ||
|
|
||
| // 储存信息 | ||
| public void Set(SipChannel channel, | ||
| string userName, | ||
| string password, | ||
| string style) | ||
| { | ||
| lock (_table.SyncRoot) | ||
| { | ||
| // 限制 hashtable 最大元素数 | ||
| if (_table.Count > 10000) | ||
| _table.Clear(); | ||
|
|
||
| _table[channel.GetHashCode()] = new LoginCacheItem | ||
| { | ||
| ChannelCode = channel.GetHashCode(), | ||
| UserName = userName, | ||
| Password = password, | ||
| Style = style, | ||
| }; | ||
| } | ||
| } | ||
|
|
||
| // 清除 | ||
| public void Clear(SipChannel channel) | ||
| { | ||
| lock (_table.SyncRoot) | ||
| { | ||
| _table.Remove(channel.GetHashCode()); | ||
| } | ||
| } | ||
|
|
||
| // 是否包含? | ||
| public bool Contains(SipChannel channel, | ||
| string userName, | ||
| string password, | ||
| string style) | ||
| { | ||
| var code = channel.GetHashCode(); | ||
| lock (_table.SyncRoot) | ||
| { | ||
| var item = _table[code] as LoginCacheItem; | ||
| if (item == null) | ||
| return false; | ||
| if (item.UserName != userName | ||
| || item.Password != password | ||
| || item.Style != style) | ||
| { | ||
| _table.Remove(code); | ||
| return false; | ||
| } | ||
|
|
||
| item.Touch(); | ||
| return true; | ||
| } | ||
| } | ||
|
|
||
| // 清除衰老的事项 | ||
| public void CleanOld(TimeSpan length) | ||
| { | ||
| DateTime now = DateTime.Now; | ||
| lock (_table.SyncRoot) | ||
| { | ||
| List<int> delete_keys = new List<int>(); | ||
| foreach(int key in _table.Keys) | ||
| { | ||
| var item = _table[key] as LoginCacheItem; | ||
| if (now - item.CreatedTime > length) | ||
| delete_keys.Add(key); | ||
| } | ||
|
|
||
| foreach(int key in delete_keys) | ||
| { | ||
| _table.Remove(key); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| class LoginCacheItem | ||
| { | ||
| public int ChannelCode { get; set; } | ||
| public string UserName { get; set; } | ||
| public string Password { get; set; } | ||
| public string Style { get; set; } | ||
|
|
||
| public DateTime CreatedTime { get; set; } | ||
| public DateTime LastTime { get; set; } | ||
|
|
||
| public LoginCacheItem() | ||
| { | ||
| CreatedTime = DateTime.Now; | ||
| LastTime = CreatedTime; | ||
| } | ||
|
|
||
| public void Touch() | ||
| { | ||
| LastTime = DateTime.Now; | ||
| } | ||
| } | ||
| } |
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