chromium/components/services/app_service/public/cpp/app_registry_cache.h

// Copyright 2018 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_SERVICES_APP_SERVICE_PUBLIC_CPP_APP_REGISTRY_CACHE_H_
#define COMPONENTS_SERVICES_APP_SERVICE_PUBLIC_CPP_APP_REGISTRY_CACHE_H_

#include <map>
#include <utility>
#include <vector>

#include "base/compiler_specific.h"
#include "base/component_export.h"
#include "base/containers/contains.h"
#include "base/memory/raw_ptr.h"
#include "base/observer_list.h"
#include "base/observer_list_types.h"
#include "base/sequence_checker.h"
#include "components/account_id/account_id.h"
#include "components/services/app_service/public/cpp/app_types.h"
#include "components/services/app_service/public/cpp/app_update.h"

namespace apps {

// An in-memory cache of all the metadata about installed apps known to App
// Service. Can be queried synchronously for information about the current
// state, and can be observed to receive updates about changes to that app
// state.
//
// AppServiceProxy sees a stream of `apps::AppPtr` "deltas", or changes in app
// state, received from publishers. This cache stores the "sum" of those
// previous deltas. When a new delta is received, observers are presented with
// an `apps:::AppUpdate` containing information about what has changed, and
// then the new delta is "added" to the stored state.
//
// This class is not thread-safe.
//
// See components/services/app_service/README.md for more details.
class COMPONENT_EXPORT(APP_UPDATE) AppRegistryCache { … };

}  // namespace apps

#endif  // COMPONENTS_SERVICES_APP_SERVICE_PUBLIC_CPP_APP_REGISTRY_CACHE_H_