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| 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_ |
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