1 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_BROWSER_CHILD_PROCESS_HOST_ITERATOR_H_ 6 #define CONTENT_PUBLIC_BROWSER_BROWSER_CHILD_PROCESS_HOST_ITERATOR_H_ 7 8 #include <list> 9 10 #include "content/common/content_export.h" 11 12 namespace IPC { 13 class Message; 14 } 15 16 namespace content { 17 class BrowserChildProcessHostDelegate; 18 class BrowserChildProcessHostImpl; 19 struct ChildProcessData; 20 21 // This class allows iteration through either all child processes, or ones of a 22 // specific type, depending on which constructor is used. Note that this should 23 // be done from the IO thread and that the iterator should not be kept around as 24 // it may be invalidated on subsequent event processing in the event loop. 25 class CONTENT_EXPORT BrowserChildProcessHostIterator { 26 public: 27 BrowserChildProcessHostIterator(); 28 explicit BrowserChildProcessHostIterator(int type); 29 ~BrowserChildProcessHostIterator(); 30 31 // These methods work on the current iterator object. Only call them if 32 // Done() returns false. 33 bool operator++(); 34 bool Done(); 35 const ChildProcessData& GetData(); 36 bool Send(IPC::Message* message); 37 BrowserChildProcessHostDelegate* GetDelegate(); 38 39 private: 40 bool all_; 41 int process_type_; 42 std::list<BrowserChildProcessHostImpl*>::iterator iterator_; 43 }; 44 45 // Helper class so that subclasses of BrowserChildProcessHostDelegate can be 46 // iterated with no casting needing. Note that because of the components build, 47 // this class can only be used by BCPHD implementations that live in content, 48 // otherwise link errors will result. 49 template <class T> 50 class CONTENT_EXPORT BrowserChildProcessHostTypeIterator 51 : public BrowserChildProcessHostIterator { 52 public: BrowserChildProcessHostTypeIterator(int process_type)53 explicit BrowserChildProcessHostTypeIterator(int process_type) 54 : BrowserChildProcessHostIterator(process_type) {} 55 T* operator->() { 56 return static_cast<T*>(GetDelegate()); 57 } 58 T* operator*() { 59 return static_cast<T*>(GetDelegate()); 60 } 61 }; 62 63 }; // namespace content 64 65 #endif // CONTENT_PUBLIC_BROWSER_BROWSER_CHILD_PROCESS_HOST_ITERATOR_H_ 66