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
57
58
59
60
61
62
63
64
65
66
67
68
|
// Copyright 2022 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_OMNIBOX_BROWSER_ZERO_SUGGEST_CACHE_SERVICE_H_
#define COMPONENTS_OMNIBOX_BROWSER_ZERO_SUGGEST_CACHE_SERVICE_H_
#include <memory>
#include <string>
#include "base/containers/lru_cache.h"
#include "base/observer_list.h"
#include "base/observer_list_types.h"
#include "build/build_config.h"
#include "components/keyed_service/core/keyed_service.h"
#include "components/omnibox/browser/search_suggestion_parser.h"
#include "components/omnibox/common/zero_suggest_cache_service_interface.h"
#include "components/prefs/pref_service.h"
class AutocompleteSchemeClassifier;
class ZeroSuggestCacheService : public ZeroSuggestCacheServiceInterface,
public KeyedService {
public:
ZeroSuggestCacheService(
std::unique_ptr<AutocompleteSchemeClassifier> scheme_classifier,
PrefService* prefs,
size_t cache_size);
ZeroSuggestCacheService(const ZeroSuggestCacheService&) = delete;
ZeroSuggestCacheService& operator=(const ZeroSuggestCacheService&) = delete;
~ZeroSuggestCacheService() override;
// Read/write zero suggest cache entries.
CacheEntry ReadZeroSuggestResponse(const std::string& page_url) const;
void StoreZeroSuggestResponse(const std::string& page_url,
const std::string& response_json);
// Remove all zero suggest cache entries.
void ClearCache();
// Returns whether or not the in-memory zero suggest cache is empty.
bool IsInMemoryCacheEmptyForTesting() const;
// ZeroSuggestCacheServiceInterface:
std::vector<ZeroSuggestCacheServiceInterface::CacheEntrySuggestResult>
GetSuggestResults(const ZeroSuggestCacheServiceInterface::CacheEntry&
cache_entry) const override;
void AddObserver(Observer* observer) override;
void RemoveObserver(Observer* observer) override;
private:
std::unique_ptr<AutocompleteSchemeClassifier> scheme_classifier_;
// Pref service used for in-memory cache data persistence. Not owned.
const raw_ptr<PrefService> prefs_;
// Cache mapping each page URL to the corresponding zero suggest response
// (serialized JSON). |mutable| is used here because reading from the cache,
// while logically const, will actually modify the internal recency list of
// the HashingLRUCache object.
mutable base::HashingLRUCache<std::string, CacheEntry> cache_;
// Dedicated cache entry for "ZPS on NTP" data in order to minimize any
// negative impact due to cache eviction policy.
CacheEntry ntp_entry_;
base::ObserverList<Observer> observers_;
};
#endif // COMPONENTS_OMNIBOX_BROWSER_ZERO_SUGGEST_CACHE_SERVICE_H_
|
