perf($cacheFactory): skip LRU bookkeeping for caches with unbound capacity

Fixes #6193
Closes #6226

Author: SekibOmazic

src/ng/cacheFactory.js

@@ -59,9 +59,11 @@ function $CacheFactoryProvider() {
       return caches[cacheId] = {
 
         put: function(key, value) {
-          var lruEntry = lruHash[key] || (lruHash[key] = {key: key});
+          if (capacity < Number.MAX_VALUE) {
+            var lruEntry = lruHash[key] || (lruHash[key] = {key: key});
 
-          refresh(lruEntry);
+            refresh(lruEntry);
+          }
 
           if (isUndefined(value)) return;
           if (!(key in data)) size++;
@@ -76,26 +78,31 @@ function $CacheFactoryProvider() {
 
 
         get: function(key) {
-          var lruEntry = lruHash[key];
+          if (capacity < Number.MAX_VALUE) {
+            var lruEntry = lruHash[key];
 
-          if (!lruEntry) return;
+            if (!lruEntry) return;
 
-          refresh(lruEntry);
+            refresh(lruEntry);
+          }
 
           return data[key];
         },
 
 
         remove: function(key) {
-          var lruEntry = lruHash[key];
+          if (capacity < Number.MAX_VALUE) {
+            var lruEntry = lruHash[key];
 
-          if (!lruEntry) return;
+            if (!lruEntry) return;
 
-          if (lruEntry == freshEnd) freshEnd = lruEntry.p;
-          if (lruEntry == staleEnd) staleEnd = lruEntry.n;
-          link(lruEntry.n,lruEntry.p);
+            if (lruEntry == freshEnd) freshEnd = lruEntry.p;
+            if (lruEntry == staleEnd) staleEnd = lruEntry.n;
+            link(lruEntry.n,lruEntry.p);
+
+            delete lruHash[key];
+          }
 
-          delete lruHash[key];
           delete data[key];
           size--;
         },