/// <summary>
/// Processes the specified random query.
/// </summary>
/// <param name="randomQuery">The random query.</param>
/// <param name="messageContext">The message context.</param>
/// <param name="storeContext">The store context.</param>
/// <returns>RandomQueryResult</returns>
internal static RandomQueryResult Process(RandomQuery randomQuery, MessageContext messageContext, IndexStoreContext storeContext)
{
RandomQueryResult randomQueryResult;
List<ResultItem> resultItemList = null;
bool indexExists = false;
int indexSize = -1;
int virtualCount = -1;
byte[] metadata = null;
try
{
IndexTypeMapping indexTypeMapping =
storeContext.StorageConfiguration.CacheIndexV3StorageConfig.IndexTypeMappingCollection[messageContext.TypeId];
#region Validate Query
ValidateQuery(indexTypeMapping, randomQuery);
#endregion
Index targetIndexInfo = indexTypeMapping.IndexCollection[randomQuery.TargetIndexName];
#region Prepare Result
#region Extract index and apply criteria
CacheIndexInternal targetIndex = IndexServerUtils.GetCacheIndexInternal(storeContext,
messageContext.TypeId,
messageContext.PrimaryId,
randomQuery.IndexId,
targetIndexInfo.ExtendedIdSuffix,
randomQuery.TargetIndexName,
0,
randomQuery.Filter,
true,
null,
false,
false,
targetIndexInfo.PrimarySortInfo,
targetIndexInfo.LocalIdentityTagList,
targetIndexInfo.StringHashCodeDictionary,
null);
#endregion
if (targetIndex != null)
{
indexSize = targetIndex.OutDeserializationContext.TotalCount;
virtualCount = targetIndex.VirtualCount;
indexExists = true;
// update performance counters
PerformanceCounters.Instance.SetCounterValue(
PerformanceCounterEnum.NumOfItemsInIndexPerRandomQuery,
messageContext.TypeId,
indexSize);
PerformanceCounters.Instance.SetCounterValue(
PerformanceCounterEnum.NumOfItemsReadPerRandomQuery,
messageContext.TypeId,
targetIndex.OutDeserializationContext.ReadItemCount);
#region Populate resultLists
int indexItemCount = targetIndex.Count;
int resultListCount = Math.Min(randomQuery.Count, indexItemCount);
IEnumerable<int> itemPositionList = Algorithm.RandomSubset(new Random(), 0, indexItemCount - 1, resultListCount);
resultItemList = CacheIndexInternalAdapter.GetResultItemList(targetIndex, itemPositionList);
#endregion
#region Get data
if (!randomQuery.ExcludeData)
{
DataTierUtil.GetData(resultItemList, storeContext, messageContext, indexTypeMapping.FullDataIdFieldList, randomQuery.FullDataIdInfo);
}
#endregion
#region Get metadata
if (randomQuery.GetMetadata)
{
metadata = IndexServerUtils.GetQueryMetadata(new List<CacheIndexInternal>(1) { targetIndex },
indexTypeMapping,
messageContext.TypeId,
messageContext.PrimaryId,
randomQuery.IndexId,
storeContext);
}
#endregion
#endregion
}
randomQueryResult = new RandomQueryResult(indexExists, indexSize, metadata, resultItemList, virtualCount, null);
}
catch (Exception ex)
{
randomQueryResult = new RandomQueryResult(false, -1, null, null, -1, ex.Message);
LoggingUtil.Log.ErrorFormat("TypeId {0} -- Error processing RandomQuery : {1}", messageContext.TypeId, ex);
}
return randomQueryResult;
}
/// <summary>
/// Validates the query.
/// </summary>
/// <param name="indexTypeMapping">The index type mapping.</param>
/// <param name="randomQuery">The random query.</param>
private static void ValidateQuery(IndexTypeMapping indexTypeMapping, RandomQuery randomQuery)
{
if (!indexTypeMapping.IndexCollection.Contains(randomQuery.TargetIndexName))
{
throw new Exception("Invalid TargetIndexName - " + randomQuery.TargetIndexName);
}
if (randomQuery.IndexId == null || randomQuery.IndexId.Length == 0)
{
throw new Exception("No IndexId present on the RandomQuery");
}
if (randomQuery.Count < 1)
{
throw new Exception("Both RandomQuery.Count should be greater than 1");
}
}