##591 added addanddelete method back to cache as Ocelot.Provider.Consul uses it...sigh at me (#592)

src/Ocelot/Cache/IOcelotCache.cs

@@ -1,11 +1,12 @@
-using System;
+using System;
-
+
-namespace Ocelot.Cache
+namespace Ocelot.Cache
-{
+{
-    public interface IOcelotCache<T>
+    public interface IOcelotCache<T>
-    {
+    {
-        void Add(string key, T value, TimeSpan ttl, string region);
+        void Add(string key, T value, TimeSpan ttl, string region);
-        T Get(string key, string region);
+        T Get(string key, string region);
-        void ClearRegion(string region);
+        void ClearRegion(string region);
-    }
+        void AddAndDelete(string key, T value, TimeSpan ttl, string region);
-}
+    }
+}

src/Ocelot/Cache/InMemoryCache.cs

@@ -39,6 +39,16 @@
             }
         }
 
+        public void AddAndDelete(string key, T value, TimeSpan ttl, string region)
+        {
+            if (_cache.ContainsKey(key))
+            {
+                _cache.Remove(key);
+            }
+
+            Add(key, value, ttl, region);
+        }
+
         public void ClearRegion(string region)
         {
             if (_regions.ContainsKey(region))

test/Ocelot.UnitTests/Cache/InMemoryCacheTests.cs

@@ -25,6 +25,18 @@
             fake.Value.ShouldBe(1);
         }
 
+        [Fact]
+        public void should_add_and_delete()
+        {
+            var fake = new Fake(1);
+            _cache.Add("1", fake, TimeSpan.FromSeconds(100), "region");
+            var newFake = new Fake(1);
+            _cache.AddAndDelete("1", newFake, TimeSpan.FromSeconds(100), "region");
+            var result = _cache.Get("1", "region");
+            result.ShouldBe(newFake);
+            newFake.Value.ShouldBe(1);
+        }
+
         [Fact]
         public void should_clear_region()
         {