public static T GetCacheObject <T>(string key, int seconds, CacheCallback call, bool refresh = false)
{
var cache = HttpRuntime.Cache;
object cacheObject = cache.Get(key);
if (cacheObject == null || refresh)
{
cacheObject = call();
if (cacheObject == null)
{
return(default(T));
}
cache.Insert(key, cacheObject, null, DateTime.Now.AddSeconds(seconds), TimeSpan.Zero);
}
if (cacheObject != null)
{
return((T)Convert.ChangeType(cacheObject, typeof(T)));
}
else
{
return(default(T));
}
}
/// <summary>
/// 监听指定的节点
/// </summary>
/// <param name="node">节点名称</param>
/// <param name="callback">节点数据更改或者节点被删除时会触发该事件</param>
/// <returns>Task</returns>
public Task Listen(string node, CacheCallback <string> callback)
{
NodeDataChangeHandler handler = null;
handler = (ct, args) =>
{
//节点被删除或者节点数据改动时清理该节点对应的缓存数据
if (args.Type == Watcher.Event.EventType.NodeDataChanged || args.Type == Watcher.Event.EventType.NodeDeleted)
{
if (callback != null)
{
callback(args.Path);
}
}
return(Task.CompletedTask);
};
NodeDataChangeHandler handlerLast = null;
if (_handlerRecord.ContainsKey(node))
{
handlerLast = _handlerRecord[node];
}
if (handlerLast != null)
{
//取消侦听
_zkClient.UnSubscribeDataChange(node, handlerLast);
}
_handlerRecord[node] = handler;
Task task = _zkClient.SubscribeDataChange(node, handler);
return(task);
}
protected ConfigurationElementCollectionForInterface(Type elementType)
{
_elementType = elementType;
_listType = typeof (List<>).MakeGenericType(new[]
{
_elementType
});
_list = new CacheCallback<int, IList>(ignored=> CreateElements());
}
public void PutItem(string key, object value, IEnumerable <string> dependentEntitySets, TimeSpan slidingExpiration,
DateTime absoluteExpiration, CacheCallback <string, object, object> callback)
{
if (callback != null)
{
CacheItemRemovedCallback c = (k, v, r) => callback(k, v, r);
PutItemExec(key, value, dependentEntitySets, slidingExpiration, absoluteExpiration, c);
}
PutItemExec(key, value, dependentEntitySets, slidingExpiration, absoluteExpiration, null);
}
public void PutItem(string key, object value, IEnumerable<string> dependentEntitySets, TimeSpan slidingExpiration,
DateTime absoluteExpiration, CacheCallback<string, object, object> callback)
{
if (callback != null)
{
CacheItemRemovedCallback c = (k, v, r) => callback(k, v, r);
PutItemExec(key, value, dependentEntitySets, slidingExpiration, absoluteExpiration, c);
}
PutItemExec(key, value, dependentEntitySets, slidingExpiration, absoluteExpiration, null);
}
public DataRequestDescriptor(string source, string cacheLocation)
{
this.Source = source;
this.CacheLocation = cacheLocation;
// cache never expires by default
MaxCacheAge = null;
CacheCallback = null;
CompletionCallback = null;
PriorityCallback = null;
BasePriority = 0;
Description = "";
}
public DataRequestDescriptor(string source, string cacheLocation, CacheCallback callback) : this(source, cacheLocation)
{
CacheCallback = callback;
}
