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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef BASE_MEMORY_REF_COUNTED_DELETE_ON_MESSAGE_LOOP_H_ |
| 6 #define BASE_MEMORY_REF_COUNTED_DELETE_ON_MESSAGE_LOOP_H_ |
| 7 |
| 8 #include "base/location.h" |
| 9 #include "base/logging.h" |
| 10 #include "base/memory/ref_counted.h" |
| 11 #include "base/message_loop/message_loop_proxy.h" |
| 12 |
| 13 namespace base { |
| 14 |
| 15 // RefCountedDeleteOnMessageLoop is similar to RefCountedThreadSafe, and ensures |
| 16 // that the object will be deleted on a specified message loop. |
| 17 // |
| 18 // Sample usage: |
| 19 // class Foo : public RefCountedDeleteOnMessageLoop<Foo> { |
| 20 // |
| 21 // Foo(const scoped_refptr<MessageLoopProxy>& loop) |
| 22 // : RefCountedDeleteOnMessageLoop<Foo>(loop) { |
| 23 // ... |
| 24 // } |
| 25 // ... |
| 26 // private: |
| 27 // friend class RefCountedDeleteOnMessageLoop<Foo>; |
| 28 // friend class DeleteHelper<Foo>; |
| 29 // |
| 30 // ~Foo(); |
| 31 // }; |
| 32 |
| 33 template <class T> |
| 34 class RefCountedDeleteOnMessageLoop : public subtle::RefCountedThreadSafeBase { |
| 35 public: |
| 36 RefCountedDeleteOnMessageLoop( |
| 37 const scoped_refptr<MessageLoopProxy>& proxy) : proxy_(proxy) { |
| 38 DCHECK(proxy_); |
| 39 } |
| 40 |
| 41 void AddRef() const { |
| 42 subtle::RefCountedThreadSafeBase::AddRef(); |
| 43 } |
| 44 |
| 45 void Release() const { |
| 46 if (subtle::RefCountedThreadSafeBase::Release()) |
| 47 DestructOnMessageLoop(); |
| 48 } |
| 49 |
| 50 protected: |
| 51 friend class DeleteHelper<RefCountedDeleteOnMessageLoop>; |
| 52 ~RefCountedDeleteOnMessageLoop() {} |
| 53 |
| 54 void DestructOnMessageLoop() const { |
| 55 const T* t = static_cast<const T*>(this); |
| 56 if (proxy_->BelongsToCurrentThread()) |
| 57 delete t; |
| 58 else |
| 59 proxy_->DeleteSoon(FROM_HERE, t); |
| 60 } |
| 61 |
| 62 scoped_refptr<MessageLoopProxy> proxy_; |
| 63 |
| 64 private: |
| 65 DISALLOW_COPY_AND_ASSIGN(RefCountedDeleteOnMessageLoop); |
| 66 }; |
| 67 |
| 68 } // namespace base |
| 69 |
| 70 #endif // BASE_MEMORY_REF_COUNTED_DELETE_ON_MESSAGE_LOOP_H_ |
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