blob: 44e0f79075bc38c5a38b278a588964c39a7cde07 [file] [log] [blame]
// Copyright 2014 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <vector>
#include <base/time/time.h>
#include <chromeos/variant_dictionary.h>
#include "commands/schema_utils.h"
namespace buffet {
// A simple notification record event to track device state changes.
// The |timestamp| records the time of the state change.
// |changed_properties| contains a property set with the new property values
// which were updated at the time the event was recorded.
struct StateChange {
StateChange(base::Time time, native_types::Object properties)
: timestamp{time}, changed_properties{std::move(properties)} {}
base::Time timestamp;
native_types::Object changed_properties;
// An abstract interface to StateChangeQueue to record and retrieve state
// change notification events.
class StateChangeQueueInterface {
// Returns true if the state change notification queue is empty.
virtual bool IsEmpty() const = 0;
// Called by StateManager when device state properties are updated.
virtual bool NotifyPropertiesUpdated(
base::Time timestamp,
native_types::Object changed_properties) = 0;
// Returns the recorded state changes since last time this method was called.
virtual std::vector<StateChange> GetAndClearRecordedStateChanges() = 0;
// No one should attempt do destroy the queue through the interface.
~StateChangeQueueInterface() {}
} // namespace buffet