/// <summary>
/// Gets the Shardlet by distribution key from either the pinned Shardlet list or by range lookup.
/// </summary>
/// <param name="shardSetName">Name of the shard set.</param>
/// <param name="distributionKey">The distribution key.</param>
/// <param name="isNew">if set to <c>true</c> the key is a new key and implementer should not look for existing ShardLet.</param>
/// <returns>Shardlet.</returns>
public override Shardlet GetShardletByDistributionKey(string shardSetName, long distributionKey,
bool isNew = false)
{
var repository = new AzureShardletMapRepository(shardSetName);
if (!isNew)
{
var azureShardlet = GetAzureShardlet(shardSetName, distributionKey);
if (azureShardlet != null)
{
return(azureShardlet.ToFrameworkShardlet());
}
}
var shardlet = new Shardlet();
//todo: how to set the sharding key?
var rangeShard = repository.Get(distributionKey);
if (rangeShard == null)
{
return(shardlet);
}
shardlet.ServerInstanceName = rangeShard.ServerInstanceName;
shardlet.Catalog = rangeShard.Catalog;
shardlet.ShardSetName = shardSetName;
shardlet.DistributionKey = distributionKey;
//TODO: Determine if the published shard should have a status and derive it from that for full shard transitions.
shardlet.Status = ShardletStatus.Active;
return(shardlet);
}
private void DeleteAzureShardlet(string shardSetName, Shardlet shardlet)
{
var repository = new AzureShardletMapRepository(shardSetName);
var azureShardlet = repository.Get(shardlet.DistributionKey);
if (azureShardlet != null)
{
repository.Delete(azureShardlet);
}
}
/// <summary>
/// Gets the shardlet by sharding key.
/// </summary>
/// <param name="shardSetName">Name of the shard set.</param>
/// <param name="shardingKey">The sharding key.</param>
/// <param name="distributionKey">The distribution key.</param>
/// <returns>Shardlet.</returns>
public override Shardlet GetShardletByShardingKey(string shardSetName, string shardingKey, long distributionKey)
{
Shardlet shardlet;
var repository = new AzureShardletMapRepository(shardSetName);
var azureShardlet = repository.Get(distributionKey);
if (azureShardlet == null)
{
var rangeShard = GetAzureRangeShard(shardSetName, distributionKey);
if (rangeShard == null)
{
// would only arrive here if the shardmap is not yet
// published or is published incorrectly
return(null);
}
// add shardlet
shardlet =
new Shardlet
{
ServerInstanceName = rangeShard.ServerInstanceName,
Catalog = rangeShard.Catalog,
ShardSetName = shardSetName,
DistributionKey = distributionKey,
ShardingKey = shardingKey,
Status = ShardletStatus.Active,
};
SaveAzureShardlet(shardlet);
}
else
{
shardlet = azureShardlet.ToFrameworkShardlet();
}
return(shardlet);
}
/// <summary>
/// Saves the azure Shardlet.
/// </summary>
/// <param name="shardlet">The shardlet.</param>
private void SaveAzureShardlet(Shardlet shardlet)
{
var shardSetName = shardlet.ShardSetName;
var distributionKey = shardlet.DistributionKey;
var shardingKey = shardlet.ShardingKey;
var status = shardlet.Status;
var serverInstanceName = shardlet.ServerInstanceName;
var catalog = shardlet.Catalog;
var pinned = shardlet.Pinned;
var repository = new AzureShardletMapRepository(shardSetName);
var azureShardlet = repository.Get(distributionKey);
if (azureShardlet == null)
{
azureShardlet =
new AzureShardlet
{
ShardSetName = shardSetName,
DistributionKey = distributionKey,
ShardingKey = shardingKey,
ServerInstanceName = serverInstanceName,
Catalog = catalog,
Status = status.ToString(),
Pinned = pinned
};
repository.Insert(azureShardlet);
}
else
{
azureShardlet.Catalog = catalog;
azureShardlet.ServerInstanceName = serverInstanceName;
azureShardlet.Status = status.ToString();
azureShardlet.Pinned = pinned;
repository.Merge(azureShardlet);
}
}
private AzureShardlet GetAzureShardlet(string shardSetName, long distributionKey)
{
var repository = new AzureShardletMapRepository(shardSetName);
return(repository.Get(distributionKey));
}
/// <summary>
/// Gets the shardlets in the shard set.
/// </summary>
/// <param name="shardSetName">Name of the shard set.</param>
/// <returns>IEnumerable<Shardlet>.</returns>
public override IEnumerable <Shardlet> GetShardlets(string shardSetName)
{
var repository = new AzureShardletMapRepository(shardSetName);
return(repository.Get().Select(s => s.ToFrameworkShardlet()).AsEnumerable());
}