public RedisIndex(RedisTableCache parent, string indexKey, SearchConditions searchConditions)
{
this._parent = parent;
this.IndexKeyInCache = indexKey;
this._searchConditions = searchConditions;
try
{
// (re)registering it in the list of indexes (it should be visible for update operations)
this._parent._redis.SetHashWithRetries(this._parent.GetIndexListKeyInCache(), this.IndexKeyInCache, this._searchConditions.ToRedisValue());
// asynchronously checking the total number of indexes
Task.Run(() => this.TryKeepIndexListSlim(indexKey));
// creating an index and marking it as being rebuilt
this._parent._redis.CreateNewHashWithRetries(this.IndexKeyInCache, IndexVersionField.Name, IndexVersionField.IsBeingRebuiltValue);
this.RedisTransaction = this._parent._redis.BeginTransaction(IndexVersionField.IsBeingRebuiltCondition(this.IndexKeyInCache));
this._parent.Log("Index ({0}) was marked as being rebuilt", this._searchConditions.Key);
}
catch (Exception ex)
{
this._parent.Log("Failed to start creating index: {0}", ex);
// if something goes wrong - dropping the index (but only from the list - we don't want to let parallel update transaction to fail)
this._parent._redis.RemoveHashFieldsWithRetries(this._parent.GetIndexListKeyInCache(), this.IndexKeyInCache);
throw;
}
}
/// <summary>
/// Loads all entities from an index or throws, if something wasn't found
/// </summary>
public static Document[] LoadProjectionIndexEntities(RedisWrapper redis, string indexKey, string indexListKey)
{
var rawIndex = redis.GetHashFieldsWithRetries(indexKey);
if (rawIndex.Length <= 0)
{
redis.RemoveHashFieldsWithRetries(indexListKey, indexKey);
throw new RedisCacheException("Index wasn't found in cache");
}
var indexVersionField = new IndexVersionField();
var wrappers =
(
from hashField in rawIndex
where !indexVersionField.TryInitialize(hashField)
select hashField.Value.ToObject <CacheDocumentWrapper>()
)
.ToList();
// if the index is being rebuilt
if (indexVersionField.IsIndexBeingRebuilt)
{
throw new RedisCacheException("Index is being rebuilt");
}
return(wrappers.Select(w => w.Document).ToArray());
}
/// <summary>
/// Loads all entities from an index or throws, if something wasn't found
/// </summary>
public static Document[] LoadIndexEntities(RedisWrapper redis, string indexKey, string indexListKey)
{
var rawIndex = redis.GetHashFieldsWithRetries(indexKey);
if (rawIndex.Length <= 0)
{
redis.RemoveHashFieldsWithRetries(indexListKey, indexKey);
throw new RedisCacheException("Index wasn't found in cache");
}
var indexVersionField = new IndexVersionField();
var entityKeys =
(
from hashField in rawIndex
where !indexVersionField.TryInitialize(hashField)
select hashField.Name.ToEntityKey()
)
.ToList();
// if the index is being rebuilt
if (indexVersionField.IsIndexBeingRebuilt)
{
throw new RedisCacheException("Index is being rebuilt");
}
try
{
var wrappers = redis.GetWithRetries <CacheDocumentWrapper>(entityKeys.Select(k => k.ToRedisKey()).ToArray());
return(wrappers.Select(w => w.Document).ToArray());
}
catch (Exception)
{
// if failed to load all entities - dropping the index
redis.RemoveHashFieldsWithRetries(indexListKey, indexKey);
redis.RemoveWithRetries(indexKey);
throw;
}
}
