/// <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);
}
/// <summary>
/// Invoked for deleting mapping in cache becase it no longer exists in store.
/// </summary>
/// <param name="mapping">Storage representation of mapping.</param>
public virtual void DeleteMapping(IStoreMapping mapping)
{
using (ReadLockScope rls = _cacheRoot.GetReadLockScope(false))
{
CacheShardMap csm = _cacheRoot.LookupById(mapping.ShardMapId);
if (csm != null)
{
using (WriteLockScope wlscsm = csm.GetWriteLockScope())
{
csm.Mapper.Remove(mapping);
/*
* // Update perf counters for remove mapping operation and mappings count.
* csm.IncrementPerformanceCounter(PerformanceCounterName.MappingsRemovePerSec);
* csm.SetPerformanceCounter(PerformanceCounterName.MappingsCount, csm.Mapper.GetMappingsCount());
*/
Tracer.TraceVerbose(
TraceSourceConstants.ComponentNames.ShardMapManager,
"OnDeleteMapping",
"Cache delete mapping complete. Mapping Id: {0}",
mapping.Id);
}
}
}
}
/// <summary>
/// Looks up a given shard map in cache based on it's name.
/// </summary>
/// <param name="shardMapName">Name of shard map.</param>
/// <returns>The shard being searched.</returns>
public virtual IStoreShardMap LookupShardMapByName(string shardMapName)
{
IStoreShardMap shardMap;
using (ReadLockScope rls = _cacheRoot.GetReadLockScope(false))
{
// Typical scenario will result in immediate lookup succeeding.
_cacheRoot.LookupByName(shardMapName, out shardMap);
}
Tracer.TraceVerbose(
TraceSourceConstants.ComponentNames.ShardMapManager,
"LookupShardMapByNameInCache",
"Cache {0}; ShardMap: {1}",
shardMap == null ? "miss" : "hit",
shardMapName);
return(shardMap);
}
