feat(view_pool): adds a view pool of dehydrated views per protoview.

modules/angular2/test/core/compiler/view_pool_spec.js

@@ -0,0 +1,46 @@
+import {describe, xit, it, expect, beforeEach, ddescribe, iit, el} from 'angular2/test_lib';
+
+import {View} from 'angular2/src/core/compiler/view';
+import {ViewPool} from 'angular2/src/core/compiler/view_pool';
+import {proxy, IMPLEMENTS} from 'angular2/src/facade/lang';
+
+@proxy
+@IMPLEMENTS(View)
+class FakeView {
+  noSuchMethod(i) {
+    super.noSuchMethod(i);
+  }
+}
+
+export function main() {
+  describe('ViewPool', () => {
+    var viewPool, capacity = 3;
+    beforeEach(() => {
+      viewPool = new ViewPool(capacity);
+    })
+
+    it('should return null when there are no views', () => {
+      expect(viewPool.pop()).toBeNull();
+      expect(viewPool.length()).toBe(0);
+    })
+
+    it('should support storing and retrieving a view', () => {
+      var view = new FakeView();
+      viewPool.push(view);
+      expect(viewPool.length()).toBe(1);
+
+      expect(viewPool.pop()).toBe(view);
+      expect(viewPool.length()).toBe(0);
+    })
+
+    it('should not store more views that its capacity', () => {
+      for (var i = 0; i < capacity * 2; i++) viewPool.push(new FakeView());
+      expect(viewPool.length()).toBe(capacity);
+
+      for (var i = 0; i < capacity; i++) {
+        expect(viewPool.pop()).not.toBe(null);
+      }
+      expect(viewPool.pop()).toBeNull();
+    })
+  })
+}

modules/angular2/test/core/compiler/view_spec.js

@@ -31,6 +31,13 @@ class FakeViewPort {
   }
 }
 
+@proxy
+@IMPLEMENTS(View)
+class FakeView {
+  noSuchMethod(i) {
+    super.noSuchMethod(i);
+  }
+}
 
 export function main() {
   describe('view', function() {
@@ -68,6 +75,14 @@ export function main() {
         view.dehydrate();
         expect(view.hydrated()).toBe(false);
       });
+
+      it('should use the view pool to reuse views', () => {
+        var pv = new ProtoView(el('<div id="1"></div>'), new DynamicProtoChangeDetector(), null);
+        var fakeView = new FakeView();
+        pv.returnToPool(fakeView);
+
+        expect(pv.instantiate(null)).toBe(fakeView);
+      });
     });
 
     describe('with locals', function() {