1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
// Copyright 2023 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_SEGMENTATION_PLATFORM_INTERNAL_DATABASE_CACHED_RESULT_PROVIDER_H_
#define COMPONENTS_SEGMENTATION_PLATFORM_INTERNAL_DATABASE_CACHED_RESULT_PROVIDER_H_
#include <optional>
#include <string>
#include "base/memory/raw_ref.h"
#include "base/memory/weak_ptr.h"
#include "components/segmentation_platform/internal/database/client_result_prefs.h"
#include "components/segmentation_platform/public/proto/prediction_result.pb.h"
namespace segmentation_platform {
struct Config;
class ClientResultPrefs;
// CachedResultProvider layer is to read results for clients from prefs at
// startup and cache it for the session. It does the following:
// 1. Reading the client result from the prefs on startup.
// 2. PostProcessing the client result.
// 3. Caching the post processed results and serving client requests from this
// cache. The cache is only read once on startup and never updated thereafter.
class CachedResultProvider {
public:
CachedResultProvider(ClientResultPrefs* result_prefs,
const std::vector<std::unique_ptr<Config>>& configs);
~CachedResultProvider();
// Disallow copy/assign.
CachedResultProvider(CachedResultProvider&) = delete;
CachedResultProvider& operator=(CachedResultProvider&) = delete;
// Returns cached un-processed result from last session for the client.
std::optional<proto::PredictionResult> GetPredictionResultForClient(
const std::string& segmentation_key);
private:
// Configs for all registered clients.
const raw_ref<const std::vector<std::unique_ptr<Config>>> configs_;
// The underlying pref backed store to read the pref values from.
const raw_ptr<ClientResultPrefs> result_prefs_;
// Map to store unprocessed result from last session for all clients.
std::map<std::string, proto::PredictionResult>
client_result_from_last_session_map_;
base::WeakPtrFactory<CachedResultProvider> weak_ptr_factory_{this};
};
} // namespace segmentation_platform
#endif // COMPONENTS_SEGMENTATION_PLATFORM_INTERNAL_DATABASE_CACHED_RESULT_PROVIDER_H_
|
