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 virtual void ClearCacheObjectTypes <T>()
{
using (new WriteLock(_locker))
{
var typeOfT = typeof(T);
var isInterface = typeOfT.IsInterface;
foreach (var key in MemoryCache
.Where(x =>
{
// x.Value is Lazy<object> and not null, its value may be null
// remove null values as well, does not hurt
// get non-created as NonCreatedValue & exceptions as null
var value = DictionaryCacheProviderBase.GetSafeLazyValue((Lazy <object>)x.Value, true);
// if T is an interface remove anything that implements that interface
// otherwise remove exact types (not inherited types)
return(value == null || (isInterface ? (value is T) : (value.GetType() == typeOfT)));
})
.Select(x => x.Key)
.ToArray()) // ToArray required to remove
{
MemoryCache.Remove(key);
}
}
}
public void ClearCacheObjectTypes <T>(Func <string, T, bool> predicate)
{
var typeOfT = typeof(T);
var isInterface = typeOfT.IsInterface;
foreach (var kvp in _items
.Where(x =>
{
// entry.Value is Lazy<object> and not null, its value may be null
// remove null values as well, does not hurt
// compare on exact type, don't use "is"
// get non-created as NonCreatedValue & exceptions as null
var value = DictionaryCacheProviderBase.GetSafeLazyValue(x.Value, true);
if (value == null)
{
return(true);
}
// if T is an interface remove anything that implements that interface
// otherwise remove exact types (not inherited types)
return((isInterface ? (value is T) : (value.GetType() == typeOfT))
// run predicate on the 'public key' part only, ie without prefix
&& predicate(x.Key, (T)value));
}))
{
_items.TryRemove(kvp.Key, out _);
}
}
public void ClearCacheObjectTypes(string typeName)
{
var type = TypeFinder.GetTypeByName(typeName);
if (type == null)
{
return;
}
var isInterface = type.IsInterface;
foreach (var kvp in _items
.Where(x =>
{
// entry.Value is Lazy<object> and not null, its value may be null
// remove null values as well, does not hurt
// get non-created as NonCreatedValue & exceptions as null
var value = DictionaryCacheProviderBase.GetSafeLazyValue(x.Value, true);
// if T is an interface remove anything that implements that interface
// otherwise remove exact types (not inherited types)
return(value == null || (isInterface ? (type.IsInstanceOfType(value)) : (value.GetType() == type)));
}))
{
_items.TryRemove(kvp.Key, out _);
}
}
public IEnumerable <object> GetCacheItemsByKeyExpression(string regexString)
{
return(_items
.Where(kvp => Regex.IsMatch(kvp.Key, regexString))
.Select(kvp => DictionaryCacheProviderBase.GetSafeLazyValue(kvp.Value))
.Where(x => x != null));
}
public IEnumerable <object> GetCacheItemsByKeySearch(string keyStartsWith)
{
return(_items
.Where(kvp => kvp.Key.InvariantStartsWith(keyStartsWith))
.Select(kvp => DictionaryCacheProviderBase.GetSafeLazyValue(kvp.Value))
.Where(x => x != null));
}
public object GetCacheItem(string cacheKey)
{
Lazy <object> result;
using (new ReadLock(_locker))
{
result = MemoryCache.Get(cacheKey) as Lazy <object>; // null if key not found
}
return(result == null ? null : DictionaryCacheProviderBase.GetSafeLazyValue(result)); // return exceptions as null
}
public IEnumerable <object> GetCacheItemsByKeyExpression(string regexString)
{
KeyValuePair <string, object>[] entries;
using (new ReadLock(_locker))
{
entries = MemoryCache
.Where(x => Regex.IsMatch(x.Key, regexString))
.ToArray(); // evaluate while locked
}
return(entries
.Select(x => DictionaryCacheProviderBase.GetSafeLazyValue((Lazy <object>)x.Value)) // return exceptions as null
.Where(x => x != null) // backward compat, don't store null values in the cache
.ToList());
}
public IEnumerable <object> GetCacheItemsByKeySearch(string keyStartsWith)
{
KeyValuePair <string, object>[] entries;
using (new ReadLock(_locker))
{
entries = MemoryCache
.Where(x => x.Key.InvariantStartsWith(keyStartsWith))
.ToArray(); // evaluate while locked
}
return(entries
.Select(x => DictionaryCacheProviderBase.GetSafeLazyValue((Lazy <object>)x.Value)) // return exceptions as null
.Where(x => x != null) // backward compat, don't store null values in the cache
.ToList());
}
public object GetCacheItem(string cacheKey)
{
Lazy <object> result;
try
{
_locker.EnterReadLock();
result = MemoryCache.Get(cacheKey) as Lazy <object>; // null if key not found
}
finally
{
if (_locker.IsReadLockHeld)
{
_locker.ExitReadLock();
}
}
return(result == null ? null : DictionaryCacheProviderBase.GetSafeLazyValue(result)); // return exceptions as null
}
public virtual void ClearCacheObjectTypes(string typeName)
{
var type = TypeFinder.GetTypeByName(typeName);
if (type == null)
{
return;
}
var isInterface = type.IsInterface;
try
{
_locker.EnterWriteLock();
foreach (var key in MemoryCache
.Where(x =>
{
// x.Value is Lazy<object> and not null, its value may be null
// remove null values as well, does not hurt
// get non-created as NonCreatedValue & exceptions as null
var value = DictionaryCacheProviderBase.GetSafeLazyValue((Lazy <object>)x.Value, true);
// if T is an interface remove anything that implements that interface
// otherwise remove exact types (not inherited types)
return(value == null || (isInterface ? (type.IsInstanceOfType(value)) : (value.GetType() == type)));
})
.Select(x => x.Key)
.ToArray()) // ToArray required to remove
{
MemoryCache.Remove(key);
}
}
finally
{
if (_locker.IsWriteLockHeld)
{
_locker.ExitWriteLock();
}
}
}
public virtual void ClearCacheObjectTypes <T>(Func <string, T, bool> predicate)
{
try
{
_locker.EnterWriteLock();
var typeOfT = typeof(T);
var isInterface = typeOfT.IsInterface;
foreach (var key in MemoryCache
.Where(x =>
{
// x.Value is Lazy<object> and not null, its value may be null
// remove null values as well, does not hurt
// get non-created as NonCreatedValue & exceptions as null
var value = DictionaryCacheProviderBase.GetSafeLazyValue((Lazy <object>)x.Value, true);
if (value == null)
{
return(true);
}
// if T is an interface remove anything that implements that interface
// otherwise remove exact types (not inherited types)
return((isInterface ? (value is T) : (value.GetType() == typeOfT)) &&
predicate(x.Key, (T)value));
})
.Select(x => x.Key)
.ToArray()) // ToArray required to remove
{
MemoryCache.Remove(key);
}
}
finally
{
if (_locker.IsWriteLockHeld)
{
_locker.ExitWriteLock();
}
}
}
public object GetCacheItem(string cacheKey)
{
_items.TryGetValue(cacheKey, out var result); // else null
return(result == null ? null : DictionaryCacheProviderBase.GetSafeLazyValue(result)); // return exceptions as null
}