.net/c# memcached缓存获取所有缓存键的方法步骤

使用组件memcached 1.2.6.net 类库 memcacheddotnet_clientlib-1.1.5

1.增加memcacheddotnet_clientlib-1.1.5代码

下载好组件后,用vs打开.net类库memcacheddotnet_clientlib-1.1.5,打开MemCachedClient.cs,增加如下方法:

public Hashtable Stats(ArrayList servers, string command)
{// get SockIOPool instance
SockIOPool pool = SockIOPool.GetInstance(_poolName);// return false if unable to get SockIO obj
if (pool == null)
{
//if(log.IsErrorEnabled)
//{
// log.Error(GetLocalizedString("unable to get socket pool"));
//}
return null;
}// get all servers and iterate over them
if (servers == null)
servers = pool.Servers;// if no servers, then return early
if (servers == null || servers.Count <= 0)
{
//if(log.IsErrorEnabled)
//{
// log.Error(GetLocalizedString("stats no servers"));
//}
return null;
}// array of stats Hashtables
Hashtable statsMaps = new Hashtable();for (int i = 0; i < servers.Count; i++)
{SockIO sock = pool.GetConnection((string)servers[i]);
if (sock == null)
{
//if(log.IsErrorEnabled)
//{
// log.Error(GetLocalizedString("unable to connect").Replace("$$Server$$", servers[i].ToString()));
//}
continue;
}// build command
if (command == null || command.Length == 0)
{
command = "stats\r\n";
}
else
{
command = command + "\r\n";
}try
{
sock.Write(UTF8Encoding.UTF8.GetBytes(command));
sock.Flush();// map to hold key value pairs
Hashtable stats = new Hashtable();// loop over results
while (true)
{
string line = sock.ReadLine();
//if(log.IsDebugEnabled)
//{
// log.Debug(GetLocalizedString("stats line").Replace("$$Line$$", line));
//}if (line.StartsWith(STATS))
{
string[] info = line.Split(' ');
string key = info[1];
string val = info[2];//if(log.IsDebugEnabled)
//{
// log.Debug(GetLocalizedString("stats success").Replace("$$Key$$", key).Replace("$$Value$$", val));
//}stats[key] = val;}
else if (line.StartsWith("ITEM"))
{string[] info = line.Split('[');
string key = info[0].Split(' ')[1];
string val = "[" + info[1];stats[key] = val;
}
else if (END == line)
{
// finish when we get end from server
//if(log.IsDebugEnabled)
//{
// log.Debug(GetLocalizedString("stats finished"));
//}
break;
}statsMaps[servers[i]] = stats;
}
}
catch//(IOException e) 
{
//if(log.IsErrorEnabled)
//{
// log.Error(GetLocalizedString("stats IOException"), e);
//}try
{
sock.TrueClose();
}
catch//(IOException) 
{
//if(log.IsErrorEnabled)
//{
// log.Error(GetLocalizedString("failed to close some socket").Replace("$$Socket$$", sock.ToString()));
//}
}sock = null;
}if (sock != null)
sock.Close();
}return statsMaps;
}

2 文章中有GetStats方法,将它修改如下:

/// <summary>
/// 获取服务器端缓存的数据信息
/// </summary>
/// <param name="serverArrayList">要访问的服务列表</param>
/// <param name="statsCommand">此参数的功能暂时无效</param>
/// <param name="param">此参数的功能暂时无效</param>
/// <returns>返回信息</returns>
public static IList<string> GetStats(IList<string> serverArrayList, MemcachedStats statsCommand, string param)
{
IList<string> statsArray = new List<string>();
if (param == null)
param = "";
else
{
param = param.Trim().ToLower();
}string commandstr = "stats";
//转换stats命令参数
switch (statsCommand)
{
case MemcachedStats.Reset: { commandstr = "stats reset"; break; }
case MemcachedStats.Malloc: { commandstr = "stats malloc"; break; }
case MemcachedStats.Maps: { commandstr = "stats maps"; break; }
case MemcachedStats.Sizes: { commandstr = "stats sizes"; break; }
case MemcachedStats.Slabs: { commandstr = "stats slabs"; break; }
case MemcachedStats.Items: { commandstr = "stats items"; break; }//此处原先是返回stats
case MemcachedStats.CachedDump:
{
string[] statsparams = param.Split(' ');
if (statsparams.Length == 2)
if (param.IsIntArr(' '))// Utils.IsNumericArray(statsparams)
commandstr = "stats cachedump " + param;break;
}
case MemcachedStats.Detail:
{
if (string.Equals(param, "on") || string.Equals(param, "off") || string.Equals(param, "dump"))
commandstr = "stats detail " + param.Trim();break;
}
default: { commandstr = "stats"; break; }
}ArrayList arr = new ArrayList(serverArrayList.ToArray());Hashtable stats = MemcachedManager.CacheClient.Stats(arr, commandstr);foreach (string key in stats.Keys)
{
statsArray.Add("server:__:" + key);//此处也改了
Hashtable values = (Hashtable)stats[key];
foreach (string key2 in values.Keys)
{
statsArray.Add(key2 + ":" + values[key2]);
}
}
return statsArray;
}

3.最后增加如下方法

/// <summary>
/// 获取所有缓存键
/// </summary>
/// <returns></returns>
public static IList<string> GetAllKeys()
{
IList<int> idList = new List<int>();
IList<string> list = MemcachedManager.GetStats(MemcachedManager.ServerList, MemcachedStats.Items, null);
foreach (var item in list)
{
string[] tmpArr = item.Split(':');
if (tmpArr.Length > 1)
{
int itemID = 0;
if (tmpArr[1] == "__") continue;int.TryParse(tmpArr[1], out itemID);
if (itemID <= 0) continue;bool find = false;
foreach (int item1 in idList)
{
if (item1 == itemID)
{
find = true;
break;
}
}if (!find)
{
idList.Add(itemID);
}
}
}IList<string> keys = new List<string>();
foreach (int item in idList)
{
IList<string> cachearr = MemcachedManager.GetStats(MemcachedManager.ServerList, MemcachedStats.CachedDump, item + " 0");
foreach (string itemCache in cachearr)
{
string[] tmpArr = itemCache.Split(':');
if (tmpArr.Length > 1)
{
if (tmpArr[1] == "__")
{
continue;
}keys.Add(tmpArr[0]);
}
}
}return keys;
}

调用方法

IList<string> list = MemcachedManager.GetAllKeys();
 foreach (var item in list)
 {
 Response.Write(item + "<br />");
 }

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