1 // Copyright 2016 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 MOJO_EDK_SYSTEM_WATCHER_SET_H_ 6 #define MOJO_EDK_SYSTEM_WATCHER_SET_H_ 7 8 #include <unordered_map> 9 10 #include "base/callback.h" 11 #include "base/macros.h" 12 #include "base/memory/ref_counted.h" 13 #include "mojo/edk/system/handle_signals_state.h" 14 #include "mojo/edk/system/watcher.h" 15 #include "mojo/public/c/system/types.h" 16 17 namespace mojo { 18 namespace edk { 19 20 // A WatcherSet maintains a set of Watchers attached to a single handle and 21 // keyed on an arbitrary user context. 22 class WatcherSet { 23 public: 24 WatcherSet(); 25 ~WatcherSet(); 26 27 // Notifies all Watchers of a state change. 28 void NotifyForStateChange(const HandleSignalsState& state); 29 30 // Notifies all Watchers that their watched handle has been closed. 31 void NotifyClosed(); 32 33 // Adds a new watcher to watch for signals in |signals| to be satisfied or 34 // unsatisfiable. |current_state| is the current signals state of the 35 // handle being watched. 36 MojoResult Add(MojoHandleSignals signals, 37 const Watcher::WatchCallback& callback, 38 uintptr_t context, 39 const HandleSignalsState& current_state); 40 41 // Removes a watcher from the set. 42 MojoResult Remove(uintptr_t context); 43 44 private: 45 // A map of watchers keyed on context value. 46 std::unordered_map<uintptr_t, scoped_refptr<Watcher>> watchers_; 47 48 DISALLOW_COPY_AND_ASSIGN(WatcherSet); 49 }; 50 51 } // namespace edk 52 } // namespace mojo 53 54 #endif // MOJO_EDK_SYSTEM_WATCHER_SET_H_ 55
