/// <summary>
/// determines equality of two cache keys based on cache context values
/// </summary>
/// <param name="otherObject"></param>
/// <returns></returns>
public override bool Equals(object otherObject)
{
Debug.Assert(null != otherObject, "otherObject must not be null");
if (typeof(EntityClientCacheKey) != otherObject.GetType())
{
return(false);
}
EntityClientCacheKey otherEntityClientCacheKey = (EntityClientCacheKey)otherObject;
return((_commandType == otherEntityClientCacheKey._commandType &&
_parameterCount == otherEntityClientCacheKey._parameterCount) &&
Equals(otherEntityClientCacheKey._eSqlStatement, _eSqlStatement) &&
Equals(otherEntityClientCacheKey._parametersToken, _parametersToken));
}
/// <summary>
/// Gets an entitycommanddefinition from cache if a match is found for the given cache key.
/// </summary>
/// <param name="entityCommandDefinition">out param. returns the entitycommanddefinition for a given cache key</param>
/// <returns>true if a match is found in cache, false otherwise</returns>
private bool TryGetEntityCommandDefinitionFromQueryCache(out EntityCommandDefinition entityCommandDefinition)
{
Debug.Assert(null != _connection, "Connection must not be null at this point");
entityCommandDefinition = null;
// if EnableQueryCaching is false, then just return to force the CommandDefinition to be created
if (!_enableQueryPlanCaching
|| string.IsNullOrEmpty(_esqlCommandText))
{
return false;
}
// Create cache key
var queryCacheKey = new EntityClientCacheKey(this);
// Try cache lookup
var queryCacheManager = _connection.GetMetadataWorkspace().GetQueryCacheManager();
Debug.Assert(null != queryCacheManager, "QuerycacheManager instance cannot be null");
if (!queryCacheManager.TryCacheLookup(queryCacheKey, out entityCommandDefinition))
{
// if not, construct the command definition using no special options;
entityCommandDefinition = CreateCommandDefinition();
// add to the cache
QueryCacheEntry outQueryCacheEntry = null;
if (queryCacheManager.TryLookupAndAdd(new QueryCacheEntry(queryCacheKey, entityCommandDefinition), out outQueryCacheEntry))
{
entityCommandDefinition = (EntityCommandDefinition)outQueryCacheEntry.GetTarget();
}
}
Debug.Assert(null != entityCommandDefinition, "out entityCommandDefinition must not be null");
return true;
}
