/// <summary>
/// Looks up a given key in given shard map.
/// </summary>
/// <param name="shardMap">Storage representation of shard map.</param>
/// <param name="key">Key value.</param>
/// <returns>Mapping corresponding to <paramref name="key"/> or null.</returns>
public virtual ICacheStoreMapping LookupMappingByKey(IStoreShardMap shardMap, ShardKey key)
{
ICacheStoreMapping sm = null;
using (ReadLockScope rls = _cacheRoot.GetReadLockScope(false))
{
CacheShardMap csm = _cacheRoot.LookupById(shardMap.Id);
if (csm != null)
{
using (ReadLockScope rlsShardMap = csm.GetReadLockScope(false))
{
IStoreMapping smDummy;
sm = csm.Mapper.LookupByKey(key, out smDummy);
/*
* // perf counter can not be updated in csm.Mapper.LookupByKey() as this function is also called from csm.Mapper.AddOrUpdate()
* // so updating perf counter value here instead.
* csm.IncrementPerformanceCounter(sm == null ? PerformanceCounterName.MappingsLookupFailedPerSec : PerformanceCounterName.MappingsLookupSucceededPerSec);
*/
}
}
}
return(sm);
}
