/// <summary>
/// Insert an item into the cache with the specified time to live,
/// sliding expiration and priority.
/// </summary>
/// <param name="keyName">The cache key</param>
/// <param name="value">The cache value</param>
/// <param name="timeToLive">How long in seconds the object should be cached.</param>
/// <param name="slidingExpiration">Whether or not to reset the time to live if the object is touched.</param>
/// <param name="priority">Priority of the cache entry.</param>
public void Insert(object keyName, object value, int timeToLive, bool slidingExpiration, CacheItemPriority priority)
{
TimeSpan timeToLiveAsTimeSpan = TimeSpan.FromSeconds(timeToLive);
Guard.IsNotNull(keyName, "key");
Guard.IsTrue(TimeSpan.Zero <= timeToLiveAsTimeSpan, "timeToLive");
System.Web.Caching.CacheItemPriority aspNetPriority = ConvertToAspNetPriority(priority);
string key = BuildKey(keyName);
if (TimeSpan.Zero < timeToLiveAsTimeSpan)
{
if (slidingExpiration)
{
_cache.Insert(key, value, null, Cache.NoAbsoluteExpiration, timeToLiveAsTimeSpan, aspNetPriority, null);
}
else
{
DateTime absoluteExpiration = DateTime.Now.AddSeconds(timeToLive);
_cache.Insert(key, value, null, absoluteExpiration, Cache.NoSlidingExpiration, aspNetPriority, null);
}
}
else
{
_cache.Insert(key, value, null, Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration, aspNetPriority, null);
}
}
public object GetCacheItem(
string cacheKey,
Func <object> getCacheItem,
TimeSpan?timeout,
bool isSliding = false,
CacheItemPriority priority = CacheItemPriority.Normal,
CacheItemRemovedCallback removedCallback = null,
string[] dependentFiles = null)
{
using (var lck = new UpgradeableReadLock(Locker))
{
var result = MemoryCache.Get(cacheKey);
if (result == null)
{
lck.UpgradeToWriteLock();
result = getCacheItem();
if (result != null)
{
var policy = GetPolicy(timeout, isSliding, removedCallback, dependentFiles);
MemoryCache.Set(cacheKey, result, policy);
}
}
return(result);
}
}
/// <summary>
/// 添加一个缓存对象(键值不能重复)
/// </summary>
/// <param name="key">缓存项键</param>
/// <param name="value">缓存项值</param>
/// <param name="absoluteExpiration">绝对到期时间 如果指定此时间 则slidingExpiration必须是TimeSpan.Zero</param>
/// <param name="slidingExpiration">最后一次访问所插入对象时与该对象到期时之间的时间间隔(单位分钟)(现在时间与最后一次访问缓存对象的时间间隔超过指定间隔 则缓存对象过过期) 如果指定此间隔 则absoluteExpiration必须是DateTime.MaxValue</param>
/// <param name="priority">优先级</param>
/// <param name="onRemoveCallback">移除缓存项时通知应用程序的回调方法</param>
public override void Add(string key, object value, DateTime absoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority priority, Action <string, object, CacheItemRemovedReason> onRemoveCallback)
{
Guard.IsNotNull(key, "键不能为空");
if (Contains(key))
{
throw new ArgumentNullException("key", "键已经存在");
}
CacheItemRemovedCallback removeCallback = (s, o, c) =>
{
if (onRemoveCallback != null)
{
onRemoveCallback(s, o, c);
}
};
System.Web.Caching.CacheItemPriority aspNetPriority = ConvertToAspNetPriority(priority);
cache.Insert(key, value, null, absoluteExpiration, slidingExpiration, aspNetPriority, removeCallback);
}
public void Insert(object keyName, object value, int timeToLive, bool slidingExpiration, CacheItemPriority priority)
{
TimeSpan timeSpan = TimeSpan.FromSeconds((double)timeToLive);
Guard.IsNotNull(keyName, "key");
Guard.IsTrue(TimeSpan.Zero <= timeSpan, "timeToLive");
System.Web.Caching.CacheItemPriority priority2 = this.ConvertToAspNetPriority(priority);
string key = this.BuildKey(keyName);
if (!(TimeSpan.Zero < timeSpan))
{
this._cache.Insert(key, value, null, Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration, priority2, null);
return;
}
if (slidingExpiration)
{
this._cache.Insert(key, value, null, Cache.NoAbsoluteExpiration, timeSpan, priority2, null);
return;
}
DateTime absoluteExpiration = DateTime.Now.AddSeconds((double)timeToLive);
this._cache.Insert(key, value, null, absoluteExpiration, Cache.NoSlidingExpiration, priority2, null);
}
public void InsertCacheItem(string cacheKey, Func <object> getCacheItem, TimeSpan?timeout = null, bool isSliding = false, CacheItemPriority priority = CacheItemPriority.Normal, CacheItemRemovedCallback removedCallback = null, string[] dependentFiles = null)
{
object result = getCacheItem();
if (result != null)
{
var policy = GetPolicy(timeout, isSliding, removedCallback, dependentFiles);
MemoryCache.Set(cacheKey, result, policy);
}
}
private static void BaseInsert(string key, object value, CacheDependency dep, DateTime absoluteExpiration, TimeSpan slidingExpiration, System.Web.Caching.CacheItemPriority priority, CacheItemRemovedCallback onRemoveCallback)
{
if (value != null)
{
_cache.Insert(key, value, dep, absoluteExpiration, slidingExpiration, priority, onRemoveCallback);
}
}
/// <summary>
/// 插入缓存 使用文件依赖与过期时间，另可设置缓存优先级与缓存失效回调函数
/// </summary>
/// <param name="key"></param>
/// <param name="obj"></param>
/// <param name="absoluteExprition"></param>
/// <param name="dep"></param>
/// <param name="priority"></param>
/// <param name="onRemoveCallback"></param>
public static void Insert(string key, object obj, TimeSpan absoluteExprition, CacheDependency dep, System.Web.Caching.CacheItemPriority priority, CacheItemRemovedCallback onRemoveCallback)
{
if (obj != null)
{
BaseInsert(key, obj, dep, DateTime.Now.Add(absoluteExprition), System.Web.Caching.Cache.NoSlidingExpiration, priority, onRemoveCallback);
}
}
public object GetCacheItem(string cacheKey, Func <object> getCacheItem, TimeSpan?timeout, bool isSliding = false, CacheItemPriority priority = CacheItemPriority.Normal, CacheItemRemovedCallback removedCallback = null, string[] dependentFiles = null)
{
// see notes in HttpRuntimeCacheProvider
Lazy <object> result;
using (var lck = new UpgradeableReadLock(_locker))
{
result = MemoryCache.Get(cacheKey) as Lazy <object>;
if (result == null || GetSafeLazyValue(result, true) == null) // get non-created as NonCreatedValue & exceptions as null
{
result = new Lazy <object>(getCacheItem);
var policy = GetPolicy(timeout, isSliding, removedCallback, dependentFiles);
lck.UpgradeToWriteLock();
MemoryCache.Set(cacheKey, result, policy);
}
}
return(result.Value);
}
/// <summary>
/// Only call with already munged (KeyInContext style) keys.
/// </summary>
private void RawSet(string cacheKey, object value, int?durationSecs, bool isSliding, System.Web.Caching.CacheItemPriority priority)
{
LocalCache.OnLogDuration(cacheKey, durationSecs, "RawSet");
var absolute = !isSliding && durationSecs.HasValue ? DateTime.UtcNow.AddSeconds(durationSecs.Value) : Cache.NoAbsoluteExpiration;
var sliding = isSliding && durationSecs.HasValue ? TimeSpan.FromSeconds(durationSecs.Value) : Cache.NoSlidingExpiration;
HttpRuntime.Cache.Insert(cacheKey, value, null, absolute, sliding, priority, Removed);
var evt = Added;
if (evt != null)
{
evt(cacheKey, value, absolute, sliding, priority, durationSecs, isSliding);
}
}
/// <summary>
/// This overload is here for legacy purposes
/// </summary>
/// <param name="cacheKey"></param>
/// <param name="getCacheItem"></param>
/// <param name="timeout"></param>
/// <param name="isSliding"></param>
/// <param name="priority"></param>
/// <param name="removedCallback"></param>
/// <param name="dependency"></param>
internal void InsertCacheItem(string cacheKey, Func <object> getCacheItem, TimeSpan?timeout = null, bool isSliding = false, CacheItemPriority priority = CacheItemPriority.Normal, CacheItemRemovedCallback removedCallback = null, CacheDependency dependency = null)
{
// NOTE - here also we must insert a Lazy<object> but we can evaluate it right now
// and make sure we don't store a null value.
var result = GetSafeLazy(getCacheItem);
var value = result.Value; // force evaluation now - this may throw if cacheItem throws, and then nothing goes into cache
if (value == null)
{
return; // do not store null values (backward compat)
}
cacheKey = GetCacheKey(cacheKey);
var absolute = isSliding ? System.Web.Caching.Cache.NoAbsoluteExpiration : (timeout == null ? System.Web.Caching.Cache.NoAbsoluteExpiration : DateTime.Now.Add(timeout.Value));
var sliding = isSliding == false ? System.Web.Caching.Cache.NoSlidingExpiration : (timeout ?? System.Web.Caching.Cache.NoSlidingExpiration);
try
{
_locker.EnterWriteLock();
//NOTE: 'Insert' on System.Web.Caching.Cache actually does an add or update!
_cache.Insert(cacheKey, result, dependency, absolute, sliding, priority, removedCallback);
}
finally
{
if (_locker.IsWriteLockHeld)
{
_locker.ExitWriteLock();
}
}
}
/// <summary>
/// This overload is here for legacy purposes
/// </summary>
/// <param name="cacheKey"></param>
/// <param name="getCacheItem"></param>
/// <param name="timeout"></param>
/// <param name="isSliding"></param>
/// <param name="priority"></param>
/// <param name="removedCallback"></param>
/// <param name="dependency"></param>
/// <returns></returns>
internal object GetCacheItem(string cacheKey, Func <object> getCacheItem, TimeSpan?timeout, bool isSliding = false, CacheItemPriority priority = CacheItemPriority.Normal, CacheItemRemovedCallback removedCallback = null, CacheDependency dependency = null)
{
cacheKey = GetCacheKey(cacheKey);
// NOTE - because we don't know what getCacheItem does, how long it will take and whether it will hang,
// getCacheItem should run OUTSIDE of the global application lock else we run into lock contention and
// nasty performance issues.
// So.... we insert a Lazy<object> in the cache while holding the global application lock, and then rely
// on the Lazy lock to ensure that getCacheItem runs once and everybody waits on it, while the global
// application lock has been released.
// NOTE
// The Lazy value creation may produce a null value.
// Must make sure (for backward compatibility) that we pretend they are not in the cache.
// So if we find an entry in the cache that already has its value created and is null,
// pretend it was not there. If value is not already created, wait... and return null, that's
// what prior code did.
// NOTE
// The Lazy value creation may throw.
// So... the null value _will_ be in the cache but never returned
Lazy <object> result;
// Fast!
// Only one thread can enter an UpgradeableReadLock at a time, but it does not prevent other
// threads to enter a ReadLock in the meantime -- only upgrading to WriteLock will prevent all
// reads. We first try with a normal ReadLock for maximum concurrency and take the penalty of
// having to re-lock in case there's no value. Would need to benchmark to figure out whether
// it's worth it, though...
try
{
_locker.EnterReadLock();
result = _cache.Get(cacheKey) as Lazy <object>; // null if key not found
}
finally
{
if (_locker.IsReadLockHeld)
{
_locker.ExitReadLock();
}
}
var value = result == null ? null : GetSafeLazyValue(result);
if (value != null)
{
return(value);
}
using (var lck = new UpgradeableReadLock(_locker))
{
result = _cache.Get(cacheKey) as Lazy <object>; // null if key not found
// cannot create value within the lock, so if result.IsValueCreated is false, just
// do nothing here - means that if creation throws, a race condition could cause
// more than one thread to reach the return statement below and throw - accepted.
if (result == null || GetSafeLazyValue(result, true) == null) // get non-created as NonCreatedValue & exceptions as null
{
result = GetSafeLazy(getCacheItem);
var absolute = isSliding ? System.Web.Caching.Cache.NoAbsoluteExpiration : (timeout == null ? System.Web.Caching.Cache.NoAbsoluteExpiration : DateTime.Now.Add(timeout.Value));
var sliding = isSliding == false ? System.Web.Caching.Cache.NoSlidingExpiration : (timeout ?? System.Web.Caching.Cache.NoSlidingExpiration);
lck.UpgradeToWriteLock();
//NOTE: 'Insert' on System.Web.Caching.Cache actually does an add or update!
_cache.Insert(cacheKey, result, dependency, absolute, sliding, priority, removedCallback);
}
}
// using GetSafeLazy and GetSafeLazyValue ensures that we don't cache
// exceptions (but try again and again) and silently eat them - however at
// some point we have to report them - so need to re-throw here
// this does not throw anymore
//return result.Value;
value = result.Value; // will not throw (safe lazy)
if (value is ExceptionHolder eh)
{
eh.Exception.Throw(); // throw once!
}
return(value);
}
public void Insert(string keyString, object value, int cacheDurationInSeconds, System.Web.Caching.CacheItemPriority priority)
{
}
/// <inheritdoc />
public object Get(string key, Func <object> factory, TimeSpan?timeout, bool isSliding = false, CacheItemPriority priority = CacheItemPriority.Normal, CacheItemRemovedCallback removedCallback = null, string[] dependentFiles = null)
{
// see notes in HttpRuntimeAppCache
Lazy <object> result;
try
{
_locker.EnterUpgradeableReadLock();
result = MemoryCache.Get(key) as Lazy <object>;
if (result == null || FastDictionaryAppCacheBase.GetSafeLazyValue(result, true) == null) // get non-created as NonCreatedValue & exceptions as null
{
result = FastDictionaryAppCacheBase.GetSafeLazy(factory);
var policy = GetPolicy(timeout, isSliding, removedCallback, dependentFiles);
try
{
_locker.EnterWriteLock();
//NOTE: This does an add or update
MemoryCache.Set(key, result, policy);
}
finally
{
if (_locker.IsWriteLockHeld)
{
_locker.ExitWriteLock();
}
}
}
}
finally
{
if (_locker.IsUpgradeableReadLockHeld)
{
_locker.ExitUpgradeableReadLock();
}
}
//return result.Value;
var value = result.Value; // will not throw (safe lazy)
if (value is FastDictionaryAppCacheBase.ExceptionHolder eh)
{
eh.Exception.Throw(); // throw once!
}
return(value);
}
///// <summary>
///// Добавляет данные в кэш
///// </summary>
///// <param name="key">Название ключа кэша</param>
///// <param name="data">Данные, которые надо положить в кэш</param>
///// <param name="cacheDuration">Длительность хранения</param>
///// <param name="priority">Приоритет кэша</param>
///// <param name="onRemoved">Событие при удалении данных из кэша</param>
//public static void AddCacheData(string key, object data, uint cacheDuration, CacheItemPriority priority, CacheItemRemovedCallback onRemoved)
//{
// AddCacheData(key, data, null, cacheDuration, 0, priority, onRemoved);
//}
/// <summary>
/// Вставка объекта в объект Cache с политиками сроков действия и приоритетов, а также с делегатом,
/// которого можно использовать для уведомления приложения при удалении вставленного элемента из Cache.
/// </summary>
/// <param name="key">Ключ кэша, используемый для ссылки на объект.</param>
/// <param name="data">Объект для вставки в кэш.</param>
/// <param name="dependency">Переменная зависимостей кэша</param>
/// <param name="cacheDuration">Время по истечению которого объект будет удален из кэша</param>
/// <param name="slidingExpiration">Интервал в секундах между временем последнего обращения к вставленному объекту и временем истечения срока действия этого объекта.
/// Если это значение равно 20 минутам, срок действия объекта истечет, и он будет удален из кэша через 20 минут после последнего обращения к этому объекту.
/// Если используется скользящий срок действия, параметр cacheDuration должен быть равен 0.</param>
/// <param name="priority">Цена объекта относительно других элементов, сохраненных в кэше, выраженная перечислением CacheItemPriority.
/// Это значение используется в кэше при исключении объектов. Объекты с более низкой ценой удаляются из кэша раньше, чем объекты с более высокой ценой.</param>
/// <param name="onRemoved">Цена объекта относительно других элементов, сохраненных в кэше, выраженная перечислением CacheItemPriority.
/// Это значение используется в кэше при исключении объектов. Объекты с более низкой ценой удаляются из кэша раньше, чем объекты с более высокой ценой.</param>
/// <param name="isTagMode">Добавлять ли данные в кэш как Insert или как Add (http://habrahabr.ru/post/61617/)</param>
public static void AddCacheData(string key, object data, CacheDependency dependency, uint cacheDuration, uint slidingExpiration, CacheItemPriority priority, CacheItemRemovedCallback onRemoved, bool isTagMode = false)
{
if (Globals.Settings.Cache.Enabled)
{
switch (Globals.CacheMode)
{
case StorageModes.AspNet:
if (!isTagMode)
{
//перезаписывваем значение в любом случае
Cache.Insert(key, data, dependency,
(cacheDuration > 0 && slidingExpiration == 0) ? DateTime.Now.AddSeconds(cacheDuration) : Cache.NoAbsoluteExpiration,
slidingExpiration > 0 ? new TimeSpan(0, 0, (int)cacheDuration) : Cache.NoSlidingExpiration, priority, onRemoved);
}
else
{
Cache.Add(key, data, dependency,
(cacheDuration > 0 && slidingExpiration == 0) ? DateTime.Now.AddSeconds(cacheDuration) : Cache.NoAbsoluteExpiration,
slidingExpiration > 0 ? new TimeSpan(0, 0, (int)cacheDuration) : Cache.NoSlidingExpiration, priority, onRemoved);
}
break;
case StorageModes.Redis:
if (onRemoved == null)
{
onRemoved = OnRemovedRedisCacheValue;
}
InsertCacheIntoRedisDb(key, data, cacheDuration);
if (!isTagMode)
{
Cache.Insert(key, false, dependency,
(cacheDuration > 0 && slidingExpiration == 0) ? DateTime.Now.AddSeconds(cacheDuration) : Cache.NoAbsoluteExpiration,
slidingExpiration > 0 ? new TimeSpan(0, 0, (int)slidingExpiration) : Cache.NoSlidingExpiration, priority, onRemoved);
}
else
{
Cache.Add(key, false, dependency,
(cacheDuration > 0 && slidingExpiration == 0) ? DateTime.Now.AddSeconds(cacheDuration) : Cache.NoAbsoluteExpiration,
slidingExpiration > 0 ? new TimeSpan(0, 0, (int)slidingExpiration) : Cache.NoSlidingExpiration, priority, onRemoved);
}
break;
case StorageModes.Memory:
if (!MemCache.ContainsKey(key))
{
MemCache.Add(key, data);
}
else
{
MemCache[key] = data;
}
break;
}
}
}
public object GetCacheItem(string cacheKey, Func <object> getCacheItem, TimeSpan?timeout, bool isSliding = false, CacheItemPriority priority = CacheItemPriority.Normal, CacheItemRemovedCallback removedCallback = null, string[] dependentFiles = null)
{
// see notes in HttpRuntimeCacheProvider
Lazy <object> result;
using (var lck = new UpgradeableReadLock(_locker))
{
result = MemoryCache.Get(cacheKey) as Lazy <object>;
if (result == null || DictionaryCacheProviderBase.GetSafeLazyValue(result, true) == null) // get non-created as NonCreatedValue & exceptions as null
{
result = DictionaryCacheProviderBase.GetSafeLazy(getCacheItem);
var policy = GetPolicy(timeout, isSliding, removedCallback, dependentFiles);
lck.UpgradeToWriteLock();
//NOTE: This does an add or update
MemoryCache.Set(cacheKey, result, policy);
}
}
//return result.Value;
var value = result.Value; // will not throw (safe lazy)
var eh = value as DictionaryCacheProviderBase.ExceptionHolder;
if (eh != null)
{
throw eh.Exception; // throw once!
}
return(value);
}
public void InsertCacheItem(string cacheKey, Func <object> getCacheItem, TimeSpan?timeout = null, bool isSliding = false, CacheItemPriority priority = CacheItemPriority.Normal, CacheItemRemovedCallback removedCallback = null, string[] dependentFiles = null)
{
CacheDependency dependency = null;
if (dependentFiles != null && dependentFiles.Any())
{
dependency = new CacheDependency(dependentFiles);
}
InsertCacheItem(cacheKey, getCacheItem, timeout, isSliding, priority, removedCallback, dependency);
}
public void InsertCacheItem(string cacheKey, Func <object> getCacheItem, TimeSpan?timeout = null, bool isSliding = false, CacheItemPriority priority = CacheItemPriority.Normal, CacheItemRemovedCallback removedCallback = null, string[] dependentFiles = null)
{
// NOTE - here also we must insert a Lazy<object> but we can evaluate it right now
// and make sure we don't store a null value.
var result = DictionaryCacheProviderBase.GetSafeLazy(getCacheItem);
var value = result.Value; // force evaluation now
if (value == null)
{
return; // do not store null values (backward compat)
}
var policy = GetPolicy(timeout, isSliding, removedCallback, dependentFiles);
//NOTE: This does an add or update
MemoryCache.Set(cacheKey, result, policy);
}
/// <summary>
/// Non-standard set for when we want to be absolutely explicit about cache priorities
/// </summary>
public void SetWithPriority <T>(string key, T value, int?durationSecs, bool isSliding, System.Web.Caching.CacheItemPriority priority)
{
LocalCache.OnLogDuration(key, durationSecs, "LocalCache.SetWithPriority");
key = KeyInContext(key);
RawSet(key, value, durationSecs, isSliding, priority);
}