Fixed some med trust issues with UmbracoExamine. Created new framework for distributed cache providers with unit tests. Still uses the

old ICacheRefresher but now we can plugin 2 new providers - one for resolving a list of servers and the other to notify the servers of changes.
By default we have the configuration based providers which uses the umbracoSettings.

src/Umbraco.Tests/Sync/DistributedCacheTests.cs

@@ -0,0 +1,180 @@
+using System;
+using System.Collections.Generic;
+using NUnit.Framework;
+using Umbraco.Core;
+using Umbraco.Core.ObjectResolution;
+using Umbraco.Core.Sync;
+using Umbraco.Web.Cache;
+using umbraco.interfaces;
+
+namespace Umbraco.Tests.Sync
+{
+    /// <summary>
+    /// Ensures that calls to DistributedCache methods carry through to the IServerMessenger correctly
+    /// </summary>
+    [TestFixture]
+    public class DistributedCacheTests
+    {
+        [SetUp]
+        public void Setup()
+        {
+            ServerRegistrarResolver.Current = new ServerRegistrarResolver(
+                new TestServerRegistrar());
+            ServerMessengerResolver.Current = new ServerMessengerResolver(
+                new TestServerMessenger());
+            CacheRefreshersResolver.Current = new CacheRefreshersResolver(() => new[] { typeof(TestCacheRefresher) });
+            Resolution.Freeze();
+        }
+
+        [TearDown]
+        public void Teardown()
+        {
+            ServerRegistrarResolver.Reset();
+            ServerMessengerResolver.Reset();
+            CacheRefreshersResolver.Reset();
+        }
+
+        [Test]
+        public void RefreshIntId()
+        {
+            for (var i = 0; i < 10; i++)
+            {
+                DistributedCache.Instance.Refresh(Guid.Parse("E0F452CB-DCB2-4E84-B5A5-4F01744C5C73"), i);
+            }
+            Assert.AreEqual(10, ((TestServerMessenger)ServerMessengerResolver.Current.Messenger).IntIdsRefreshed.Count);
+        }
+
+        [Test]
+        public void RefreshGuidId()
+        {
+            for (var i = 0; i < 11; i++)
+            {
+                DistributedCache.Instance.Refresh(Guid.Parse("E0F452CB-DCB2-4E84-B5A5-4F01744C5C73"), Guid.NewGuid());
+            }
+            Assert.AreEqual(11, ((TestServerMessenger)ServerMessengerResolver.Current.Messenger).GuidIdsRefreshed.Count);
+        }
+
+        [Test]
+        public void RemoveIds()
+        {
+            for (var i = 0; i < 12; i++)
+            {
+                DistributedCache.Instance.Remove(Guid.Parse("E0F452CB-DCB2-4E84-B5A5-4F01744C5C73"), i);
+            }
+            Assert.AreEqual(12, ((TestServerMessenger)ServerMessengerResolver.Current.Messenger).IntIdsRemoved.Count);
+        }
+
+        [Test]
+        public void FullRefreshes()
+        {
+            for (var i = 0; i < 13; i++)
+            {
+                DistributedCache.Instance.RefreshAll(Guid.Parse("E0F452CB-DCB2-4E84-B5A5-4F01744C5C73"));
+            }
+            Assert.AreEqual(13, ((TestServerMessenger)ServerMessengerResolver.Current.Messenger).CountOfFullRefreshes);
+        }
+
+        #region internal test classes
+
+        internal class TestCacheRefresher : ICacheRefresher
+        {
+            public Guid UniqueIdentifier
+            {
+                get { return Guid.Parse("E0F452CB-DCB2-4E84-B5A5-4F01744C5C73"); }
+            }
+            public string Name
+            {
+                get { return "Test"; }
+            }
+            public void RefreshAll()
+            {
+                
+            }
+
+            public void Refresh(int id)
+            {
+                
+            }
+
+            public void Remove(int id)
+            {
+                
+            }
+
+            public void Refresh(Guid id)
+            {
+               
+            }
+        }
+
+        internal class TestServerMessenger : IServerMessenger
+        {
+            //used for tests
+            public List<int> IntIdsRefreshed = new List<int>(); 
+            public List<Guid> GuidIdsRefreshed = new List<Guid>();
+            public List<int> IntIdsRemoved = new List<int>();
+            public int CountOfFullRefreshes = 0;
+            
+
+            public void PerformRefresh<T>(IEnumerable<IServerRegistration> servers, ICacheRefresher refresher, Func<T, int> getNumericId, params T[] instances)
+            {
+                throw new NotImplementedException();
+            }
+
+            public void PerformRefresh<T>(IEnumerable<IServerRegistration> servers, ICacheRefresher refresher, Func<T, Guid> getGuidId, params T[] instances)
+            {
+                throw new NotImplementedException();
+            }
+
+            public void PerformRemove<T>(IEnumerable<IServerRegistration> servers, ICacheRefresher refresher, Func<T, int> getNumericId, params T[] instances)
+            {
+                throw new NotImplementedException();
+            }
+
+            public void PerformRemove(IEnumerable<IServerRegistration> servers, ICacheRefresher refresher, params int[] numericIds)
+            {
+                IntIdsRemoved.AddRange(numericIds);
+            }
+
+            public void PerformRefresh(IEnumerable<IServerRegistration> servers, ICacheRefresher refresher, params int[] numericIds)
+            {
+                IntIdsRefreshed.AddRange(numericIds);
+            }
+
+            public void PerformRefresh(IEnumerable<IServerRegistration> servers, ICacheRefresher refresher, params Guid[] guidIds)
+            {
+                GuidIdsRefreshed.AddRange(guidIds);
+            }
+
+            public void PerformRefreshAll(IEnumerable<IServerRegistration> servers, ICacheRefresher refresher)
+            {
+                CountOfFullRefreshes++;
+            }
+        }
+
+        internal class TestServerRegistrar : IServerRegistrar
+        {
+            public IEnumerable<IServerRegistration> Registrations
+            {
+                get
+                {
+                    return new List<IServerRegistration>()
+                        {
+                            new TestServerRegistration("localhost")
+                        };
+                }
+            }
+        }
+
+        public class TestServerRegistration : IServerRegistration
+        {
+            public TestServerRegistration(string address)
+            {
+                ServerAddress = address;
+            }
+            public string ServerAddress { get; private set; }
+        }
+
+        #endregion
+    }
+}