71 lines
1.9 KiB
C++
71 lines
1.9 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_CORE_WATCHER_SET_H_
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#define MOJO_CORE_WATCHER_SET_H_
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#include "base/containers/flat_map.h"
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#include "base/macros.h"
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#include "base/memory/ref_counted.h"
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#include "base/optional.h"
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#include "mojo/core/handle_signals_state.h"
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#include "mojo/core/watcher_dispatcher.h"
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namespace mojo {
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namespace core {
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// A WatcherSet maintains a set of references to WatcherDispatchers to be
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// notified when a handle changes state.
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//
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// Dispatchers which may be watched by a watcher should own a WatcherSet and
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// notify it of all relevant state changes.
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class WatcherSet {
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public:
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// |owner| is the Dispatcher who owns this WatcherSet.
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explicit WatcherSet(Dispatcher* owner);
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~WatcherSet();
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// Notifies all watchers of the handle's current signals state.
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void NotifyState(const HandleSignalsState& state);
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// Notifies all watchers that this handle has been closed.
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void NotifyClosed();
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// Adds a new watcher+context.
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MojoResult Add(const scoped_refptr<WatcherDispatcher>& watcher,
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uintptr_t context,
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const HandleSignalsState& current_state);
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// Removes a watcher+context.
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MojoResult Remove(WatcherDispatcher* watcher, uintptr_t context);
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private:
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using ContextSet = std::set<uintptr_t>;
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struct Entry {
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Entry(const scoped_refptr<WatcherDispatcher>& dispatcher);
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Entry(Entry&& other);
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~Entry();
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Entry& operator=(Entry&& other);
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scoped_refptr<WatcherDispatcher> dispatcher;
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ContextSet contexts;
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private:
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DISALLOW_COPY_AND_ASSIGN(Entry);
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};
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Dispatcher* const owner_;
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base::flat_map<WatcherDispatcher*, Entry> watchers_;
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base::Optional<HandleSignalsState> last_known_state_;
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DISALLOW_COPY_AND_ASSIGN(WatcherSet);
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};
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} // namespace core
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} // namespace mojo
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#endif // MOJO_CORE_WATCHER_SET_H_
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