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// 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_
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