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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_COLLABORATION_INTERNAL_MESSAGING_DATA_SHARING_CHANGE_NOTIFIER_H_
#define COMPONENTS_COLLABORATION_INTERNAL_MESSAGING_DATA_SHARING_CHANGE_NOTIFIER_H_
#include "base/functional/callback.h"
#include "components/data_sharing/public/data_sharing_service.h"
#include "google_apis/gaia/gaia_id.h"
namespace base {
class Time;
} // namespace base
namespace collaboration::messaging {
class DataSharingChangeNotifier
: public data_sharing::DataSharingService::Observer {
public:
using FlushCallback = base::OnceClosure;
// A delta observer that is invoked asynchronously based on updates from the
// DataSharingService.
class Observer : public base::CheckedObserver {
public:
// Called when the DataSharingServiceChangeNofitier has been initialized.
// Use DataSharingChangeNotifier::IsInitialized() to check whether it has
// already been initialized. If the service has already been initialized
// when an observer is added, this is invoked asynchronously.
// No other observer calls happen until the FlushCallback returned from
// Initialize has been invoked, which flushes all events up until then.
virtual void OnDataSharingChangeNotifierInitialized() {}
// User either created a new group or has joined an existing one.
// GroupData is provided as long as it is still available.
virtual void OnGroupAdded(
const data_sharing::GroupId& group_id,
const std::optional<data_sharing::GroupData>& group_data,
const base::Time& event_time) {}
// Either group has been deleted or user has been removed from the group.
// GroupData is provided as long as it is still available.
virtual void OnGroupRemoved(
const data_sharing::GroupId& group_id,
const std::optional<data_sharing::GroupData>& group_data,
const base::Time& event_time) {}
// Called when a new member has been added to the group.
virtual void OnGroupMemberAdded(const data_sharing::GroupData& group_data,
const GaiaId& member_gaia_id,
const base::Time& event_time) {}
// Called when a member has been removed from the group.
virtual void OnGroupMemberRemoved(const data_sharing::GroupData& group_data,
const GaiaId& member_gaia_id,
const base::Time& event_time) {}
};
~DataSharingChangeNotifier() override;
virtual void AddObserver(Observer* observer) = 0;
virtual void RemoveObserver(Observer* observer) = 0;
// Kicks off the initialization of this component. Returns a callback for when
// the service can start flushing events since startup. The flushing of events
// happen synchronously.
virtual FlushCallback Initialize() = 0;
// Whether this instance has finished initialization.
virtual bool IsInitialized() = 0;
};
} // namespace collaboration::messaging
#endif // COMPONENTS_COLLABORATION_INTERNAL_MESSAGING_DATA_SHARING_CHANGE_NOTIFIER_H_
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