| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef MOJO_EDK_SYSTEM_WATCHER_SET_H_ |
| #define MOJO_EDK_SYSTEM_WATCHER_SET_H_ |
| |
| #include <unordered_map> |
| |
| #include "base/callback.h" |
| #include "base/macros.h" |
| #include "base/memory/ref_counted.h" |
| #include "mojo/edk/system/handle_signals_state.h" |
| #include "mojo/edk/system/watcher.h" |
| #include "mojo/public/c/system/types.h" |
| |
| namespace mojo { |
| namespace edk { |
| |
| // A WatcherSet maintains a set of Watchers attached to a single handle and |
| // keyed on an arbitrary user context. |
| class WatcherSet { |
| public: |
| WatcherSet(); |
| ~WatcherSet(); |
| |
| // Notifies all Watchers of a state change. |
| void NotifyForStateChange(const HandleSignalsState& state); |
| |
| // Notifies all Watchers that their watched handle has been closed. |
| void NotifyClosed(); |
| |
| // Adds a new watcher to watch for signals in |signals| to be satisfied or |
| // unsatisfiable. |current_state| is the current signals state of the |
| // handle being watched. |
| MojoResult Add(MojoHandleSignals signals, |
| const Watcher::WatchCallback& callback, |
| uintptr_t context, |
| const HandleSignalsState& current_state); |
| |
| // Removes a watcher from the set. |
| MojoResult Remove(uintptr_t context); |
| |
| private: |
| // A map of watchers keyed on context value. |
| std::unordered_map<uintptr_t, scoped_refptr<Watcher>> watchers_; |
| |
| DISALLOW_COPY_AND_ASSIGN(WatcherSet); |
| }; |
| |
| } // namespace edk |
| } // namespace mojo |
| |
| #endif // MOJO_EDK_SYSTEM_WATCHER_SET_H_ |