1c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. 2c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott// Use of this source code is governed by a BSD-style license that can be 3c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott// found in the LICENSE file. 4c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 5c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott#ifndef NET_BASE_COMPLETION_CALLBACK_H__ 6c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott#define NET_BASE_COMPLETION_CALLBACK_H__ 73345a6884c488ff3a535c2c9acdd33d74b37e311Iain Merrick#pragma once 8c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 9c407dc5cd9bdc5668497f21b26b09d988ab439deBen Murdoch#include "base/callback.h" 10c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 11c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scottnamespace net { 12c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 13c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott// A callback specialization that takes a single int parameter. Usually this 14c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott// is used to report a byte count or network error code. 15c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scotttypedef Callback1<int>::Type CompletionCallback; 16c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 17c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott// Used to implement a CompletionCallback. 18c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scotttemplate <class T> 19c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scottclass CompletionCallbackImpl : 20c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott public CallbackImpl< T, void (T::*)(int), Tuple1<int> > { 21c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott public: 22c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott CompletionCallbackImpl(T* obj, void (T::* meth)(int)) 23c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott : CallbackImpl< T, void (T::*)(int), 24c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott Tuple1<int> >::CallbackImpl(obj, meth) { 25c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott } 26c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott}; 27c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 28c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott// CancelableCompletionCallback is used for completion callbacks 29c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott// which may outlive the target for the method dispatch. In such a case, the 30c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott// provider of the callback calls Cancel() to mark the callback as 31c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott// "canceled". When the canceled callback is eventually run it does nothing 32c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott// other than to decrement the refcount to 0 and free the memory. 33c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scotttemplate <class T> 34c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scottclass CancelableCompletionCallback : 35c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott public CompletionCallbackImpl<T>, 36c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott public base::RefCounted<CancelableCompletionCallback<T> > { 37c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott public: 38c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott CancelableCompletionCallback(T* obj, void (T::* meth)(int)) 39c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott : CompletionCallbackImpl<T>(obj, meth), is_canceled_(false) { 40c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott } 41c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 42c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott void Cancel() { 43c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott is_canceled_ = true; 44c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott } 45c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 46c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott virtual void RunWithParams(const Tuple1<int>& params) { 47c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott if (is_canceled_) { 48c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott base::RefCounted<CancelableCompletionCallback<T> >::Release(); 49c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott } else { 50c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott CompletionCallbackImpl<T>::RunWithParams(params); 51c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott } 52c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott } 53c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 54c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott private: 55c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott bool is_canceled_; 56c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott}; 57c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 58c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott} // namespace net 59c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott 60c7f5f8508d98d5952d42ed7648c2a8f30a4da156Patrick Scott#endif // NET_BASE_COMPLETION_CALLBACK_H__ 61