/// <summary>
/// Handles operation <see cref = "AttachInterestArea" />: Attaches an existing <see cref = "InterestArea" /> to an existing <see cref = "Item" />.
/// </summary>
/// <param name = "peer">
/// The client peer.
/// </param>
/// <param name = "request">
/// The request.
/// </param>
/// <param name = "sendParameters">
/// The send Parameters.
/// </param>
/// <returns>
/// An <see cref = "OperationResponse" /> with error code <see cref = "ReturnCode.Ok" />, <see cref = "ReturnCode.InterestAreaNotFound" /> or <see cref = "ReturnCode.ItemNotFound" />.
/// </returns>
public OperationResponse OperationAttachInterestArea(PeerBase peer, OperationRequest request, SendParameters sendParameters)
{
var operation = new AttachInterestArea(peer.Protocol, request);
if (!operation.IsValid)
{
return new OperationResponse(request.OperationCode) { ReturnCode = (int)ReturnCode.InvalidOperationParameter, DebugMessage = operation.GetErrorMessage() };
}
operation.OnStart();
InterestArea interestArea;
if (this.TryGetInterestArea(operation.InterestAreaId, out interestArea) == false)
{
return operation.GetOperationResponse((int)ReturnCode.InterestAreaNotFound, "InterestAreaNotFound");
}
Item item;
bool actorItem;
if (false == operation.ItemType.HasValue || string.IsNullOrEmpty(operation.ItemId))
{
item = this.Avatar;
actorItem = true;
// set return vaues
operation.ItemId = item.Id;
operation.ItemType = item.Type;
}
else
{
IWorld world = this.World;
actorItem = this.TryGetItem(operation.ItemType.Value, operation.ItemId, out item);
if (actorItem == false)
{
if (world.ItemCache.TryGetItem(operation.ItemType.Value, operation.ItemId, out item) == false)
{
return operation.GetOperationResponse((int)ReturnCode.ItemNotFound, "ItemNotFound");
}
}
}
if (actorItem)
{
// we are already in the item thread, invoke directly
return this.ItemOperationAttachInterestArea(item, operation, interestArea, sendParameters);
}
// second parameter (peer) allows us to send an error event to the client (in case of an error)
item.Fiber.Enqueue(
() => this.ExecItemOperation(() => this.ItemOperationAttachInterestArea(item, operation, interestArea, sendParameters), sendParameters));
// response is sent later
return null;
}
/// <summary>
/// The operation attach interest area.
/// </summary>
/// <param name = "item">
/// The mmo item.
/// </param>
/// <param name = "operation">
/// The operation.
/// </param>
/// <param name = "interestArea">
/// The interestArea.
/// </param>
/// <param name = "sendParameters">
/// The send Parameters.
/// </param>
/// <returns>
/// Ok or ItemNotFound
/// </returns>
private OperationResponse ItemOperationAttachInterestArea(
Item item, AttachInterestArea operation, InterestArea interestArea, SendParameters sendParameters)
{
if (item.Disposed)
{
return operation.GetOperationResponse((int)ReturnCode.ItemNotFound, "ItemNotFound");
}
lock (interestArea.SyncRoot)
{
interestArea.Detach();
interestArea.AttachToItem(item);
interestArea.UpdateInterestManagement();
}
// use item channel to ensure that this event arrives before any move or subscribe events
OperationResponse response = operation.GetOperationResponse(MethodReturnValue.Ok);
sendParameters.ChannelId = Settings.ItemEventChannel;
this.Peer.SendOperationResponse(response, sendParameters);
operation.OnComplete();
return null;
}