private void EntryExpired(CacheEntry entry)
{
// TODO: For efficiency consider processing these expirations in batches.
RemoveEntry(entry);
StartScanForExpiredItems();
}
public object Set(object key, object value, MemoryCacheEntryOptions cacheEntryOptions)
{
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
CheckDisposed();
CacheEntry priorEntry = null;
var utcNow = _clock.UtcNow;
DateTimeOffset?absoluteExpiration = null;
if (cacheEntryOptions.AbsoluteExpirationRelativeToNow.HasValue)
{
absoluteExpiration = utcNow + cacheEntryOptions.AbsoluteExpirationRelativeToNow;
}
else if (cacheEntryOptions.AbsoluteExpiration.HasValue)
{
if (cacheEntryOptions.AbsoluteExpiration <= utcNow)
{
throw new ArgumentOutOfRangeException(
nameof(MemoryCacheEntryOptions.AbsoluteExpiration),
cacheEntryOptions.AbsoluteExpiration.Value,
"The absolute expiration value must be in the future.");
}
absoluteExpiration = cacheEntryOptions.AbsoluteExpiration;
}
var entry = new CacheEntry(
key,
value,
utcNow,
absoluteExpiration,
cacheEntryOptions,
_entryExpirationNotification);
var link = EntryLinkHelpers.ContextLink;
if (link != null)
{
// Copy expiration tokens and AbsoluteExpiration to the link.
// We do this regardless of it gets cached because the tokens are associated with the value we'll return.
if (entry.Options.ExpirationTokens != null)
{
link.AddExpirationTokens(entry.Options.ExpirationTokens);
}
if (absoluteExpiration.HasValue)
{
link.SetAbsoluteExpiration(absoluteExpiration.Value);
}
}
bool added = false;
_entryLock.EnterWriteLock();
try
{
if (_entries.TryGetValue(key, out priorEntry))
{
_entries.Remove(key);
priorEntry.SetExpired(EvictionReason.Replaced);
}
if (!entry.CheckExpired(utcNow))
{
_entries[key] = entry;
entry.AttachTokens();
added = true;
}
}
finally
{
_entryLock.ExitWriteLock();
}
if (priorEntry != null)
{
priorEntry.InvokeEvictionCallbacks();
}
if (!added)
{
entry.InvokeEvictionCallbacks();
}
StartScanForExpiredItems();
return(value);
}
public bool TryGetValue(object key, out object value)
{
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
value = null;
CacheEntry expiredEntry = null;
bool found = false;
CheckDisposed();
_entryLock.EnterReadLock();
try
{
CacheEntry entry;
if (_entries.TryGetValue(key, out entry))
{
// Check if expired due to expiration tokens, timers, etc. and if so, remove it.
if (entry.CheckExpired(_clock.UtcNow))
{
expiredEntry = entry;
}
else
{
// Refresh sliding expiration, etc.
entry.LastAccessed = _clock.UtcNow;
value = entry.Value;
found = true;
var link = EntryLinkHelpers.ContextLink;
if (link != null)
{
// Copy expiration tokens and AbsoluteExpiration to the link
if (entry.Options.ExpirationTokens != null)
{
link.AddExpirationTokens(entry.Options.ExpirationTokens);
}
if (entry.Options.AbsoluteExpiration.HasValue)
{
link.SetAbsoluteExpiration(entry.Options.AbsoluteExpiration.Value);
}
}
}
}
}
finally
{
_entryLock.ExitReadLock();
}
if (expiredEntry != null)
{
// TODO: For efficiency queue this up for batch removal
RemoveEntry(expiredEntry);
}
StartScanForExpiredItems();
return(found);
}