/// <summary>
/// Handles the shard map publishing request and processes it against the shard set driver.
/// </summary>
/// <param name="request">The shard map publishing request.</param>
/// <param name="queue">The queue.</param>
public static void HandleShardMapPublishingRequest(ShardMapPublishingRequest request,
IShardSetActionQueue queue)
{
var shardSetConfig = GetCurrentShardSetConfig(request.ShardSetName);
Action <ShardMapPublishingRequest> process =
x =>
{
ProcessShardMapPublishingRequest(x, shardSetConfig);
if (!request.ShouldUpdateShardMap)
{
return;
}
PublishRangeMap(shardSetConfig.ShardSetName, request.CurrentShardMapID, request.NewShardMapID);
};
Action <ShardMapPublishingRequest> complete =
x =>
{
CompleteShardMapPublishingRequest(shardSetConfig, x);
queue.SendQueueProcessingEvent(GetCompletionMessage("ShardMapPublishingRequest", x));
};
Action <ShardMapPublishingRequest> error =
x => queue.SendQueueProcessingEvent(GetErrorMessage("ShardMapPublishingRequest", x));
request.Process(process, complete, error);
}
/// <summary>
/// Handles the shard deletion request and processes it against the shard set driver.
/// </summary>
/// <param name="request">The shard deletion request.</param>
/// <param name="queue">The queue.</param>
public static void HandleShardDeletionRequest(ShardDeletionRequest request,
IShardSetActionQueue queue)
{
var config = GetCurrentShardSetConfig(request.ShardSetName);
var driver = GetShardSetDriver(config);
Action <ShardDeletionRequest> process = (x =>
{
var shard = new RangeShard
{
Catalog = request.Catalog,
ServerInstanceName = request.ServerInstanceName,
};
//Do not delete the database if it is populated for now, as the move shardlet code could error leaving shardlets behind
//TODO: Allow this to delete populated databases, by orchestrating that a failed shardlet move stops this step for that database.
driver.DeleteShard(shard, config);
});
Action <ShardDeletionRequest> complete =
(x => queue.SendQueueProcessingEvent(GetCompletionMessage("ShardDeletionRequest", x)));
Action <ShardDeletionRequest> error =
(x => queue.SendQueueProcessingEvent(GetErrorMessage("ShardDeletionRequest", x)));
request.Process(process, complete, error);
}
/// <summary>
/// Handles the shardlet move request from tje request queue.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="queue">The queue.</param>
/// <param name="uniqueProcessID">A unique process identifier that can be set to maintain state between moves.</param>
public static void HandleShardletMoveRequest(ShardletMoveRequest request, IShardSetActionQueue queue,
Guid uniqueProcessID)
{
Action <ShardletMoveRequest> process =
x =>
{
var shardlet = Load(x.ShardSetName, x.ShardingKey);
var destinationShard =
new RangeShard
{
Catalog = x.DestinationCatalog,
ServerInstanceName = x.DestinationServerInstanceName
};
shardlet.MoveToShard(destinationShard, x.Pin, x.DeleteOnMove, uniqueProcessID);
};
Action <ShardletMoveRequest> complete =
x =>
{
var message = GetCompletionMessage("ShardletMoveRequest", x);
queue.SendQueueProcessingEvent(message);
};
Action <ShardletMoveRequest> error =
x =>
{
var message = GetErrorMessage("ShardletMoveRequest", x);
queue.SendQueueProcessingEvent(message);
};
request.Process(process, complete, error);
}
/// <summary>
/// Handles the shard creation request and processes it against the shard set driver.
/// </summary>
/// <param name="request">The shard creation request.</param>
/// <param name="queue">The queue.</param>
public static void HandleShardCreationRequest(ShardCreationRequest request,
IShardSetActionQueue queue)
{
var config = GetCurrentShardSetConfig(request.ShardSetName);
var driver = GetShardSetDriver(config);
Action <ShardCreationRequest> process = (x =>
{
var shard = new RangeShard
{
Catalog = request.Catalog,
ServerInstanceName = request.ServerInstanceName,
};
driver.CreateShard(shard, config);
});
Action <ShardCreationRequest> complete =
(x => queue.SendQueueProcessingEvent(GetCompletionMessage("ShardCreationRequest", x)));
Action <ShardCreationRequest> error =
(x => queue.SendQueueProcessingEvent(GetErrorMessage("ShardCreationRequest", x)));
request.Process(process, complete, error);
}
public ScaleOutQueueManager(IShardSetActionQueue shardSetActionQueue)
{
_shardSetActionQueue = shardSetActionQueue;
}
