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Add regression test for teleporting between neighbouring regions on the same simulator 

This adds a non-advertised wait_for_callback option in [EntityTransfer].  Default is always true.
Teleport tests disable the wait for callback from the destination region in order to run within a single thread.
0.7.4.1
Justin Clark-Casey (justincc) 2012-05-01 23:14:12 +01:00
parent 5786521103
commit 9d2e1c67a8
10 changed files with 248 additions and 33 deletions
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3
OpenSim/Region/ClientStack/Linden/UDP/Tests/LLImageManagerTests.cs
View File

@ -79,7 +79,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP.Tests
J2KDecoderModule j2kdm = new J2KDecoderModule();
scene = new SceneHelpers().SetupScene();
SceneHelpers sceneHelpers = new SceneHelpers();
scene = sceneHelpers.SetupScene();
SceneHelpers.SetupSceneModules(scene, j2kdm);
tc = new TestClient(SceneHelpers.GenerateAgentData(userId), scene);

28
OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
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@ -52,12 +52,20 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
public const int DefaultMaxTransferDistance = 4095;
public const bool EnableWaitForCallbackFromTeleportDestDefault = true;
/// <summary>
/// The maximum distance, in standard region units (256m) that an agent is allowed to transfer.
/// </summary>
public int MaxTransferDistance { get; set; }
/// <summary>
/// If true then on a teleport, the source region waits for a callback from the destination region. If
/// a callback fails to arrive within a set time then the user is pulled back into the source region.
/// </summary>
public bool EnableWaitForCallbackFromTeleportDest { get; set; }
protected bool m_Enabled = false;
protected Scene m_aScene;
protected List<Scene> m_Scenes = new List<Scene>();
@ -99,9 +107,16 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
{
IConfig transferConfig = source.Configs["EntityTransfer"];
if (transferConfig != null)
{
EnableWaitForCallbackFromTeleportDest
= transferConfig.GetBoolean("wait_for_callback", EnableWaitForCallbackFromTeleportDestDefault);
MaxTransferDistance = transferConfig.GetInt("max_distance", DefaultMaxTransferDistance);
}
else
{
MaxTransferDistance = DefaultMaxTransferDistance;
}
m_agentsInTransit = new List<UUID>();
m_Enabled = true;
@ -499,6 +514,9 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
}
else
{
ICapabilitiesModule capModule = sp.Scene.CapsModule;
ulong regionHandle = reg.RegionHandle;
capModule.GetChildSeed(UUID.Zero, regionHandle);
agentCircuit.CapsPath = sp.Scene.CapsModule.GetChildSeed(sp.UUID, reg.RegionHandle);
capsPath = finalDestination.ServerURI + CapsUtil.GetCapsSeedPath(agentCircuit.CapsPath);
}
@ -527,7 +545,8 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
sp.ControllingClient.SendTeleportProgress(teleportFlags | (uint)TeleportFlags.DisableCancel, "sending_dest");
m_log.DebugFormat(
"[ENTITY TRANSFER MODULE]: Sending new CAPS seed url {0} to client {1}", capsPath, sp.UUID);
"[ENTITY TRANSFER MODULE]: Sending new CAPS seed url {0} from {1} to {2}",
capsPath, sp.Scene.RegionInfo.RegionName, sp.Name);
if (eq != null)
{
@ -546,7 +565,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
// TeleportFinish makes the client send CompleteMovementIntoRegion (at the destination), which
// trigers a whole shebang of things there, including MakeRoot. So let's wait for confirmation
// that the client contacted the destination before we close things here.
if (!WaitForCallback(sp.UUID))
if (EnableWaitForCallbackFromTeleportDest && !WaitForCallback(sp.UUID))
{
m_log.WarnFormat(
"[ENTITY TRANSFER MODULE]: Teleport of {0} to {1} failed due to no callback from destination region. Returning avatar to source region.",
@ -1286,7 +1305,6 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
{
if (neighbour.RegionHandle != sp.Scene.RegionInfo.RegionHandle)
{
AgentCircuitData currentAgentCircuit = sp.Scene.AuthenticateHandler.GetAgentCircuitData(sp.ControllingClient.CircuitCode);
AgentCircuitData agent = sp.ControllingClient.RequestClientInfo();
agent.BaseFolder = UUID.Zero;
@ -1311,7 +1329,9 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
seeds.Add(neighbour.RegionHandle, agent.CapsPath);
}
else
{
agent.CapsPath = sp.Scene.CapsModule.GetChildSeed(sp.UUID, neighbour.RegionHandle);
}
cagents.Add(agent);
}
@ -1934,6 +1954,8 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
return true;
else
return false;
return true;
}
protected void SetInTransit(UUID id)

3
OpenSim/Region/CoreModules/Framework/InventoryAccess/Tests/InventoryAccessModuleTests.cs
View File

@ -65,7 +65,8 @@ namespace OpenSim.Region.CoreModules.Framework.InventoryAccess.Tests
config.AddConfig("Modules");
config.Configs["Modules"].Set("InventoryAccessModule", "BasicInventoryAccessModule");
m_scene = new SceneHelpers().SetupScene();
SceneHelpers sceneHelpers = new SceneHelpers();
m_scene = sceneHelpers.SetupScene();
SceneHelpers.SetupSceneModules(m_scene, config, m_iam);
// Create user

3
OpenSim/Region/Framework/Scenes/Tests/ScenePresenceAgentTests.cs
View File

@ -128,7 +128,8 @@ namespace OpenSim.Region.Framework.Scenes.Tests
IConfig config = configSource.AddConfig("Modules");
config.Set("SimulationServices", "LocalSimulationConnectorModule");
TestScene scene = new SceneHelpers().SetupScene();
SceneHelpers sceneHelpers = new SceneHelpers();
TestScene scene = sceneHelpers.SetupScene();
SceneHelpers.SetupSceneModules(scene, configSource, lsc);
UUID agentId = TestHelpers.ParseTail(0x01);

112
OpenSim/Region/Framework/Scenes/Tests/ScenePresenceTeleportTests.cs
View File

@ -33,8 +33,9 @@ using OpenMetaverse;
using OpenSim.Framework;
using OpenSim.Framework.Communications;
using OpenSim.Framework.Servers;
using OpenSim.Region.CoreModules.Framework.EntityTransfer;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.CoreModules.Framework;
using OpenSim.Region.CoreModules.Framework.EntityTransfer;
using OpenSim.Region.CoreModules.ServiceConnectorsOut.Simulation;
using OpenSim.Tests.Common;
using OpenSim.Tests.Common.Mock;
@ -49,6 +50,22 @@ namespace OpenSim.Region.Framework.Scenes.Tests
[TestFixture]
public class ScenePresenceTeleportTests
{
[TestFixtureSetUp]
public void FixtureInit()
{
// Don't allow tests to be bamboozled by asynchronous events. Execute everything on the same thread.
Util.FireAndForgetMethod = FireAndForgetMethod.RegressionTest;
}
[TestFixtureTearDown]
public void TearDown()
{
// We must set this back afterwards, otherwise later tests will fail since they're expecting multiple
// threads. Possibly, later tests should be rewritten so none of them require async stuff (which regression
// tests really shouldn't).
Util.FireAndForgetMethod = Util.DefaultFireAndForgetMethod;
}
[Test]
public void TestSameRegionTeleport()
{
@ -96,10 +113,14 @@ namespace OpenSim.Region.Framework.Scenes.Tests
LocalSimulationConnectorModule lscm = new LocalSimulationConnectorModule();
IConfigSource config = new IniConfigSource();
config.AddConfig("Modules");
// Not strictly necessary since FriendsModule assumes it is the default (!)
config.Configs["Modules"].Set("EntityTransferModule", etm.Name);
config.Configs["Modules"].Set("SimulationServices", lscm.Name);
IConfig modulesConfig = config.AddConfig("Modules");
modulesConfig.Set("EntityTransferModule", etm.Name);
modulesConfig.Set("SimulationServices", lscm.Name);
IConfig entityTransferConfig = config.AddConfig("EntityTransfer");
// In order to run a single threaded regression test we do not want the entity transfer module waiting
// for a callback from the destination scene before removing its avatar data.
entityTransferConfig.Set("wait_for_callback", false);
SceneHelpers sh = new SceneHelpers();
TestScene sceneA = sh.SetupScene("sceneA", TestHelpers.ParseTail(0x100), 1000, 1000);
@ -110,12 +131,12 @@ namespace OpenSim.Region.Framework.Scenes.Tests
Vector3 teleportPosition = new Vector3(10, 11, 12);
Vector3 teleportLookAt = new Vector3(20, 21, 22);
ScenePresence sp = SceneHelpers.AddScenePresence(sceneA, userId);
ScenePresence sp = SceneHelpers.AddScenePresence(sceneA, userId, sh.SceneManager);
sp.AbsolutePosition = new Vector3(30, 31, 32);
// XXX: A very nasty hack to tell the client about the destination scene without having to crank the whole
// UDP stack (?)
((TestClient)sp.ControllingClient).TeleportTargetScene = sceneB;
// ((TestClient)sp.ControllingClient).TeleportTargetScene = sceneB;
sceneA.RequestTeleportLocation(
sp.ControllingClient,
@ -124,6 +145,8 @@ namespace OpenSim.Region.Framework.Scenes.Tests
teleportLookAt,
(uint)TeleportFlags.ViaLocation);
((TestClient)sp.ControllingClient).CompleteTeleportClientSide();
Assert.That(sceneA.GetScenePresence(userId), Is.Null);
ScenePresence sceneBSp = sceneB.GetScenePresence(userId);
@ -137,5 +160,80 @@ namespace OpenSim.Region.Framework.Scenes.Tests
// position instead).
// Assert.That(sp.Lookat, Is.EqualTo(teleportLookAt));
}
[Test]
public void TestSameSimulatorNeighbouringRegionsTeleport()
{
TestHelpers.InMethod();
// TestHelpers.EnableLogging();
UUID userId = TestHelpers.ParseTail(0x1);
EntityTransferModule etm = new EntityTransferModule();
LocalSimulationConnectorModule lscm = new LocalSimulationConnectorModule();
IConfigSource config = new IniConfigSource();
IConfig modulesConfig = config.AddConfig("Modules");
modulesConfig.Set("EntityTransferModule", etm.Name);
modulesConfig.Set("SimulationServices", lscm.Name);
IConfig entityTransferConfig = config.AddConfig("EntityTransfer");
// In order to run a single threaded regression test we do not want the entity transfer module waiting
// for a callback from the destination scene before removing its avatar data.
entityTransferConfig.Set("wait_for_callback", false);
SceneHelpers sh = new SceneHelpers();
TestScene sceneA = sh.SetupScene("sceneA", TestHelpers.ParseTail(0x100), 1000, 1000);
TestScene sceneB = sh.SetupScene("sceneB", TestHelpers.ParseTail(0x200), 1001, 1000);
SceneHelpers.SetupSceneModules(new Scene[] { sceneA, sceneB }, config, etm, lscm);
SceneHelpers.SetupSceneModules(sceneA, new CapabilitiesModule());
SceneHelpers.SetupSceneModules(sceneB, new CapabilitiesModule());
Vector3 teleportPosition = new Vector3(10, 11, 12);
Vector3 teleportLookAt = new Vector3(20, 21, 22);
ScenePresence originalSp = SceneHelpers.AddScenePresence(sceneA, userId, sh.SceneManager);
originalSp.AbsolutePosition = new Vector3(30, 31, 32);
ScenePresence beforeSceneASp = sceneA.GetScenePresence(userId);
Assert.That(beforeSceneASp, Is.Not.Null);
Assert.That(beforeSceneASp.IsChildAgent, Is.False);
ScenePresence beforeSceneBSp = sceneB.GetScenePresence(userId);
Assert.That(beforeSceneBSp, Is.Not.Null);
Assert.That(beforeSceneBSp.IsChildAgent, Is.True);
// XXX: A very nasty hack to tell the client about the destination scene without having to crank the whole
// UDP stack (?)
// ((TestClient)beforeSceneASp.ControllingClient).TeleportTargetScene = sceneB;
sceneA.RequestTeleportLocation(
beforeSceneASp.ControllingClient,
sceneB.RegionInfo.RegionHandle,
teleportPosition,
teleportLookAt,
(uint)TeleportFlags.ViaLocation);
((TestClient)beforeSceneASp.ControllingClient).CompleteTeleportClientSide();
ScenePresence afterSceneASp = sceneA.GetScenePresence(userId);
Assert.That(afterSceneASp, Is.Not.Null);
Assert.That(afterSceneASp.IsChildAgent, Is.True);
ScenePresence afterSceneBSp = sceneB.GetScenePresence(userId);
Assert.That(afterSceneBSp, Is.Not.Null);
Assert.That(afterSceneBSp.IsChildAgent, Is.False);
Assert.That(afterSceneBSp.Scene.RegionInfo.RegionName, Is.EqualTo(sceneB.RegionInfo.RegionName));
Assert.That(afterSceneBSp.AbsolutePosition, Is.EqualTo(teleportPosition));
// TODO: Add assertions to check correct circuit details in both scenes.
// Lookat is sent to the client only - sp.Lookat does not yield the same thing (calculation from camera
// position instead).
// Assert.That(sp.Lookat, Is.EqualTo(teleportLookAt));
// TestHelpers.DisableLogging();
}
}
}

72
OpenSim/Tests/Common/Helpers/SceneHelpers.cs
View File

@ -58,6 +58,11 @@ namespace OpenSim.Tests.Common
/// </summary>
public class SceneHelpers
{
/// <summary>
/// We need a scene manager so that test clients can retrieve a scene when performing teleport tests.
/// </summary>
public SceneManager SceneManager { get; private set; }
private AgentCircuitManager m_acm = new AgentCircuitManager();
private ISimulationDataService m_simDataService
= OpenSim.Server.Base.ServerUtils.LoadPlugin<ISimulationDataService>("OpenSim.Tests.Common.dll", null);
@ -76,6 +81,8 @@ namespace OpenSim.Tests.Common
public SceneHelpers(CoreAssetCache cache)
{
SceneManager = new SceneManager();
m_assetService = StartAssetService(cache);
m_authenticationService = StartAuthenticationService();
m_inventoryService = StartInventoryService();
@ -186,6 +193,8 @@ namespace OpenSim.Tests.Common
testScene.LoginsDisabled = false;
testScene.RegisterRegionWithGrid();
SceneManager.Add(testScene);
return testScene;
}
@ -350,6 +359,7 @@ namespace OpenSim.Tests.Common
List<IRegionModuleBase> newModules = new List<IRegionModuleBase>();
foreach (object module in modules)
{
// Console.WriteLine("MODULE RAW {0}", module);
if (module is IRegionModule)
{
IRegionModule m = (IRegionModule)module;
@ -367,6 +377,7 @@ namespace OpenSim.Tests.Common
// for the new system, everything has to be initialised first,
// shared modules have to be post-initialised, then all get an AddRegion with the scene
IRegionModuleBase m = (IRegionModuleBase)module;
// Console.WriteLine("MODULE {0}", m.Name);
m.Initialise(config);
newModules.Add(m);
}
@ -426,6 +437,10 @@ namespace OpenSim.Tests.Common
/// <summary>
/// Add a root agent where the details of the agent connection (apart from the id) are unimportant for the test
/// </summary>
/// <remarks>
/// This can be used for tests where there is only one region or where there are multiple non-neighbour regions
/// and teleport doesn't take place.
/// </remarks>
/// <param name="scene"></param>
/// <param name="agentId"></param>
/// <returns></returns>
@ -434,6 +449,18 @@ namespace OpenSim.Tests.Common
return AddScenePresence(scene, GenerateAgentData(agentId));
}
/// <summary>
/// Add a root agent where the details of the agent connection (apart from the id) are unimportant for the test
/// </summary>
/// <param name="scene"></param>
/// <param name="agentId"></param>
/// <param name="sceneManager"></param>
/// <returns></returns>
public static ScenePresence AddScenePresence(Scene scene, UUID agentId, SceneManager sceneManager)
{
return AddScenePresence(scene, GenerateAgentData(agentId), sceneManager);
}
/// <summary>
/// Add a root agent.
/// </summary>
@ -453,6 +480,30 @@ namespace OpenSim.Tests.Common
/// <param name="agentData"></param>
/// <returns></returns>
public static ScenePresence AddScenePresence(Scene scene, AgentCircuitData agentData)
{
return AddScenePresence(scene, agentData, null);
}
/// <summary>
/// Add a root agent.
/// </summary>
/// <remarks>
/// This function
///
/// 1) Tells the scene that an agent is coming. Normally, the login service (local if standalone, from the
/// userserver if grid) would give initial login data back to the client and separately tell the scene that the
/// agent was coming.
///
/// 2) Connects the agent with the scene
///
/// This function performs actions equivalent with notifying the scene that an agent is
/// coming and then actually connecting the agent to the scene. The one step missed out is the very first
/// </remarks>
/// <param name="scene"></param>
/// <param name="agentData"></param>
/// <param name="sceneManager"></param>
/// <returns></returns>
public static ScenePresence AddScenePresence(Scene scene, AgentCircuitData agentData, SceneManager sceneManager)
{
// We emulate the proper login sequence here by doing things in four stages
@ -463,7 +514,7 @@ namespace OpenSim.Tests.Common
lpsc.m_PresenceService.LoginAgent(agentData.AgentID.ToString(), agentData.SessionID, agentData.SecureSessionID);
// Stages 1 & 2
ScenePresence sp = IntroduceClientToScene(scene, agentData, TeleportFlags.ViaLogin);
ScenePresence sp = IntroduceClientToScene(scene, sceneManager, agentData, TeleportFlags.ViaLogin);
// Stage 3: Complete the entrance into the region. This converts the child agent into a root agent.
sp.CompleteMovement(sp.ControllingClient, true);
@ -471,7 +522,20 @@ namespace OpenSim.Tests.Common
return sp;
}
private static ScenePresence IntroduceClientToScene(Scene scene, AgentCircuitData agentData, TeleportFlags tf)
/// <summary>
/// Introduce an agent into the scene by adding a new client.
/// </summary>
/// <returns>The scene presence added</returns>
/// <param name='sceneManager'>
/// Scene manager. Can be null if there is only one region in the test or multiple regions that are not
/// neighbours and where no teleporting takes place.
/// </param>
/// <param name='scene'></param>
/// <param name='sceneManager></param>
/// <param name='agentData'></param>
/// <param name='tf'></param>
private static ScenePresence IntroduceClientToScene(
Scene scene, SceneManager sceneManager, AgentCircuitData agentData, TeleportFlags tf)
{
string reason;
@ -480,7 +544,7 @@ namespace OpenSim.Tests.Common
Console.WriteLine("NewUserConnection failed: " + reason);
// Stage 2: add the new client as a child agent to the scene
TestClient client = new TestClient(agentData, scene);
TestClient client = new TestClient(agentData, scene, sceneManager);
scene.AddNewClient(client, PresenceType.User);
return scene.GetScenePresence(agentData.AgentID);
@ -492,7 +556,7 @@ namespace OpenSim.Tests.Common
acd.child = true;
// XXX: ViaLogin may not be correct for child agents
return IntroduceClientToScene(scene, acd, TeleportFlags.ViaLogin);
return IntroduceClientToScene(scene, null, acd, TeleportFlags.ViaLogin);
}
/// <summary>

39
OpenSim/Tests/Common/Mock/TestClient.cs
View File

@ -46,12 +46,10 @@ namespace OpenSim.Tests.Common.Mock
EventWaitHandle wh = new EventWaitHandle (false, EventResetMode.AutoReset, "Crossing");
// TODO: This is a really nasty (and temporary) means of telling the test client which scene to invoke setup
// methods on when a teleport is requested
public Scene TeleportTargetScene;
private TestClient TeleportSceneClient;
private Scene m_scene;
private SceneManager m_sceneManager;
// Properties so that we can get at received data for test purposes
public List<UUID> ReceivedOfflineNotifications { get; private set; }
@ -432,15 +430,29 @@ namespace OpenSim.Tests.Common.Mock
/// <summary>
/// Constructor
/// </summary>
/// <remarks>
/// Can be used for a test where there is only one region or where there are multiple regions that are not
/// neighbours and where no teleporting takes place. In other situations, the constructor that takes in a
/// scene manager should be used.
/// </remarks>
/// <param name="agentData"></param>
/// <param name="scene"></param>
public TestClient(AgentCircuitData agentData, Scene scene)
public TestClient(AgentCircuitData agentData, Scene scene) : this(agentData, scene, null) {}
/// <summary>
/// Constructor
/// </summary>
/// <param name="agentData"></param>
/// <param name="scene"></param>
/// <param name="sceneManager"></param>
public TestClient(AgentCircuitData agentData, Scene scene, SceneManager sceneManager)
{
m_agentId = agentData.AgentID;
m_firstName = agentData.firstname;
m_lastName = agentData.lastname;
m_circuitCode = agentData.circuitcode;
m_scene = scene;
m_sceneManager = sceneManager;
SessionId = agentData.SessionID;
SecureSessionId = agentData.SecureSessionID;
CapsSeedUrl = agentData.CapsPath;
@ -590,8 +602,16 @@ namespace OpenSim.Tests.Common.Mock
AgentCircuitData newAgent = RequestClientInfo();
// Stage 2: add the new client as a child agent to the scene
TeleportSceneClient = new TestClient(newAgent, TeleportTargetScene);
TeleportTargetScene.AddNewClient(TeleportSceneClient, PresenceType.User);
uint x, y;
Utils.LongToUInts(neighbourHandle, out x, out y);
x /= Constants.RegionSize;
y /= Constants.RegionSize;
Scene neighbourScene;
m_sceneManager.TryGetScene(x, y, out neighbourScene);
TeleportSceneClient = new TestClient(newAgent, neighbourScene, m_sceneManager);
neighbourScene.AddNewClient(TeleportSceneClient, PresenceType.User);
}
public virtual void SendRegionTeleport(ulong regionHandle, byte simAccess, IPEndPoint regionExternalEndPoint,
@ -601,6 +621,13 @@ namespace OpenSim.Tests.Common.Mock
CapsSeedUrl = capsURL;
// We don't do this here so that the source region can complete processing first in a single-threaded
// regression test scenario. The test itself will have to call CompleteTeleportClientSide() after a teleport
// CompleteTeleportClientSide();
}
public void CompleteTeleportClientSide()
{
TeleportSceneClient.CompleteMovement();
//TeleportTargetScene.AgentCrossing(newAgent.AgentID, new Vector3(90, 90, 90), false);
}

7
OpenSim/Tests/Common/TestHelpers.cs
View File

@ -46,7 +46,8 @@ namespace OpenSim.Tests.Common
<!-- A1 uses PatternLayout -->
<layout type=""log4net.Layout.PatternLayout"">
<!-- Print the date in ISO 8601 format -->
<conversionPattern value=""%date [%thread] %-5level %logger %ndc - %message%newline"" />
<!-- <conversionPattern value=""%date [%thread] %-5level %logger %ndc - %message%newline"" /> -->
<conversionPattern value=""%date %message%newline"" />
</layout>
</appender>
@ -62,9 +63,9 @@ namespace OpenSim.Tests.Common
Encoding.UTF8.GetBytes(
// "<?xml version=\"1.0\" encoding=\"utf-8\" ?><configuration><log4net><root><level value=\"OFF\"/><appender-ref ref=\"A1\"/></root></log4net></configuration>")));
//"<?xml version=\"1.0\" encoding=\"utf-8\" ?><configuration><log4net><root><level value=\"OFF\"/></root></log4net></configuration>")));
//"<configuration><log4net><root><level value=\"OFF\"/></root></log4net></configuration>")));
// "<configuration><log4net><root><level value=\"OFF\"/></root></log4net></configuration>"));
// "<configuration><log4net><root></root></log4net></configuration>")));
//"<configuration><log4net><root/></log4net></configuration>")));
// "<configuration><log4net><root/></log4net></configuration>"));
"<log4net><root/></log4net>"));
public static bool AssertThisDelegateCausesArgumentException(TestDelegate d)