| // |
| // Copyright 2019 Google LLC. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| |
| #import <Foundation/Foundation.h> |
| |
| NS_ASSUME_NONNULL_BEGIN |
| |
| /** NSObject extension to help with weak referenced objects. */ |
| @interface NSObject (EDOWeakObject) |
| |
| /** |
| * Wraps an NSObject into a EDOWeakObject. |
| * |
| * Boxes an object into a EDOWeakObject, which is an NSProxy that directs any call to the original |
| * object. User would use this method when testing with weakly referenced objects. |
| * |
| * Usage for assigning a weak reference to object: |
| * Original usage: weakReference = object; |
| * Updated usage: weakReference = [object remoteWeak]; |
| * |
| * When a user references an underlying object weakly across processes remotely, since there were |
| * no ownership to the object across processes, the underlying object will be deallocated |
| * immediately. Through the usage of remoteWeak, the underlying object is wrapped to an |
| * EDOWeakObject which directs any call to the underlying object. At the same time, EDOWeakObject |
| * is added and owned by a weakly referenced objects library at the host side. It is then retained |
| * and won't get deallocated immediately. After the underlying object is out of scope, the |
| * deallocation tracker helps to remove the strong reference to EDOWeakObject, so the memory gets |
| * released. |
| */ |
| - (instancetype)remoteWeak; |
| |
| @end |
| |
| NS_ASSUME_NONNULL_END |
