public IEnumerable <Document> GetEntities(SearchConditions searchConditions, IEnumerable <string> projectedFields, string orderByFieldName, bool orderByDesc)
{
string indexKey = this.GetIndexKey(searchConditions);
string indexListKey = this.GetIndexListKeyInCache();
try
{
Document[] result = null;
// if a full index was found
if (this._redis.HashFieldExistsWithRetries(indexListKey, indexKey))
{
result = RedisIndex.LoadIndexEntities(this._redis, indexKey, indexListKey);
}
else if (projectedFields != null)
{
// then trying to use a projection index
indexKey = this.GetIndexKey(searchConditions, projectedFields);
if (this._redis.HashFieldExistsWithRetries(indexListKey, indexKey))
{
result = RedisProjectionIndex.LoadProjectionIndexEntities(this._redis, indexKey, indexListKey);
}
}
// if we failed to load both full and projection index
if (result == null)
{
this.OnMiss.FireSafely();
return(null);
}
this.OnHit.FireSafely();
this.Log("Index ({0}) with {1} items successfully loaded from cache", indexKey, result.Length);
if (string.IsNullOrEmpty(orderByFieldName))
{
return(result);
}
// creating a comparer to sort the results
var comparer = PrimitiveComparer.GetComparer(this._tableEntityType, orderByFieldName);
return(orderByDesc
?
result.OrderByDescending(doc => doc[orderByFieldName].AsPrimitive(), comparer)
:
result.OrderBy(doc => doc[orderByFieldName].AsPrimitive(), comparer)
);
}
catch (Exception ex)
{
this.Log("Failed to load index ({0}) from cache. {1}", indexKey, ex);
this.OnMiss.FireSafely();
return(null);
}
}
private Task <bool> AddToIndex(RedisIndex index, string value, double indexScore)
{
return(this._redisDb.SortedSetAddAsync(index.ToString(), value, indexScore));
}
public Task <bool> AddToIndex(RedisIndex index, UInt256 hash, double indexScore)
{
return(this.AddToIndex(index, hash.ToString(), indexScore));
}
public async Task <UInt256> GetFromHashIndex(RedisIndex index, double indexScore)
{
var values = (await _redisDb.SortedSetRangeByScoreAsync(index.ToString(), indexScore, indexScore)).ToStringArray();
return(values.Any() ? UInt256.Parse(values.First()) : null);
}
public IndexAttribute(RedisIndex index)
{
Index = index;
}
/// <summary>
/// Retrieves the length / number of elements in an index
/// </summary>
/// <param name="index">Index to retrieve the length of</param>
/// <returns></returns>
public long GetIndexLength(RedisIndex index)
{
return(_redisDb.SortedSetLength(index.ToString()));
}
/// <summary>
/// Retrieves a specified range of values from a Redis Sorted Set based on a range of scores
/// </summary>
/// <param name="index">Index to search</param>
/// <param name="startIndexScore">Range starting score</param>
/// <param name="endIndexScore">Range end score</param>
/// <returns></returns>
public RedisValue[] GetRangeFromIndex(RedisIndex index, double startIndexScore, double endIndexScore)
{
return(_redisDb.SortedSetRangeByScore(index.ToString(), startIndexScore, endIndexScore));
}
/// <summary>
/// Retrieves a specified value from a Redis Sorted Set based on score.
/// </summary>
/// <param name="index">Index to search</param>
/// <param name="indexScore">Score to retrieve.</param>
/// <returns></returns>
public RedisValue[] GetFromIndex(RedisIndex index, double indexScore)
{
return(_redisDb.SortedSetRangeByScore(index.ToString(), indexScore, indexScore));
}
/// <summary>
/// Adds a specified value and score to a Redis Sorted Set. Using a Redis Sorted Set will give us a O(log(n)) complexity on search.
/// </summary>
/// <param name="index">Index to write</param>
/// <param name="indexScore">Score to assign</param>
/// <param name="value">Value associated with score</param>
public void AddToIndex(RedisIndex index, double indexScore, string value)
{
_redisDb.SortedSetAdd(index.ToString(), value, indexScore);
}
