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