// <summary>
// lookup service
// </summary>
// <returns> true if cache hit, false if cache miss </returns>
private bool TryInternalCacheLookup(QueryCacheKey queryCacheKey, out QueryCacheEntry queryCacheEntry)
{
DebugCheck.NotNull(queryCacheKey);
queryCacheEntry = null;
var bHit = false;
//
// lock the cache for the minimal possible period
//
lock (_cacheDataLock)
{
bHit = _cacheData.TryGetValue(queryCacheKey, out queryCacheEntry);
}
//
// if cache hit
//
if (bHit)
{
//
// update hit mark in cache key
//
queryCacheEntry.QueryCacheKey.UpdateHit();
}
return(bHit);
}
// <summary>
// Adds new entry to the cache using "abstract" cache context and
// value; returns an existing entry if the key is already in the
// dictionary.
// </summary>
// <param name="outQueryCacheEntry"> The existing entry in the dicitionary if already there; inQueryCacheEntry if none was found and inQueryCacheEntry was added instead. </param>
// <returns> true if the output entry was already found; false if it had to be added. </returns>
internal bool TryLookupAndAdd(QueryCacheEntry inQueryCacheEntry, out QueryCacheEntry outQueryCacheEntry)
{
DebugCheck.NotNull(inQueryCacheEntry);
outQueryCacheEntry = null;
lock (_cacheDataLock)
{
if (!_cacheData.TryGetValue(inQueryCacheEntry.QueryCacheKey, out outQueryCacheEntry))
{
//
// add entry to cache data
//
_cacheData.Add(inQueryCacheEntry.QueryCacheKey, inQueryCacheEntry);
if (_cacheData.Count > _sweepingTriggerHighMark)
{
_evictionTimer.Start();
}
return(false);
}
else
{
outQueryCacheEntry.QueryCacheKey.UpdateHit();
return(true);
}
}
}
internal bool TryCacheLookup <TK, TE>(TK key, out TE value) where TK : QueryCacheKey
{
value = default(TE);
QueryCacheEntry queryCacheEntry = (QueryCacheEntry)null;
bool flag = this.TryInternalCacheLookup((QueryCacheKey)key, out queryCacheEntry);
if (flag)
{
value = (TE)queryCacheEntry.GetTarget();
}
return(flag);
}
private bool TryInternalCacheLookup(
QueryCacheKey queryCacheKey,
out QueryCacheEntry queryCacheEntry)
{
queryCacheEntry = (QueryCacheEntry)null;
bool flag = false;
lock (this._cacheDataLock)
flag = this._cacheData.TryGetValue(queryCacheKey, out queryCacheEntry);
if (flag)
{
queryCacheEntry.QueryCacheKey.UpdateHit();
}
return(flag);
}
internal bool TryLookupAndAdd(
QueryCacheEntry inQueryCacheEntry,
out QueryCacheEntry outQueryCacheEntry)
{
outQueryCacheEntry = (QueryCacheEntry)null;
lock (this._cacheDataLock)
{
if (!this._cacheData.TryGetValue(inQueryCacheEntry.QueryCacheKey, out outQueryCacheEntry))
{
this._cacheData.Add(inQueryCacheEntry.QueryCacheKey, inQueryCacheEntry);
if (this._cacheData.Count > this._sweepingTriggerHighMark)
{
this._evictionTimer.Start();
}
return(false);
}
outQueryCacheEntry.QueryCacheKey.UpdateHit();
return(true);
}
}
// <summary>
// Lookup service for a cached value.
// </summary>
internal bool TryCacheLookup <TK, TE>(TK key, out TE value)
where TK : QueryCacheKey
{
DebugCheck.NotNull(key);
value = default(TE);
//
// invoke internal lookup
//
QueryCacheEntry qEntry = null;
var bHit = TryInternalCacheLookup(key, out qEntry);
//
// if it is a hit, 'extract' the entry strong type cache value
//
if (bHit)
{
value = (TE)qEntry.GetTarget();
}
return(bHit);
}
