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1 // Copyright 2017 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_SUGGESTIONS_OBSERVER_H _ | |
6 #define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_SUGGESTIONS_OBSERVER_H _ | |
Dmitry Titov
2017/04/11 21:50:46
These ifdefs and file name need to match the class
dewittj
2017/04/12 00:22:48
Done.
| |
7 | |
8 #include <memory> | |
9 | |
10 #include "base/callback.h" | |
11 #include "base/memory/weak_ptr.h" | |
12 #include "components/ntp_snippets/content_suggestions_service.h" | |
13 #include "components/offline_pages/core/prefetch/prefetch_service.h" | |
14 | |
15 namespace content { | |
16 class BrowserContext; | |
17 } // namespace content | |
18 | |
19 namespace ntp_snippets { | |
20 class Category; | |
21 } | |
22 | |
23 namespace offline_pages { | |
24 | |
25 // Observes the ContentSuggestionsService, listening for new suggestions of a | |
26 // single category (initially ARTICLES). When those suggestions arrive, it | |
27 // then forwards them to the Prefetch Service. | |
28 class SuggestionsObserver | |
29 : public ntp_snippets::ContentSuggestionsService::Observer, | |
30 base::SupportsUserData::Data { | |
31 public: | |
32 // Abstract delegate for easy dependency injection in testing. | |
33 class Delegate { | |
34 public: | |
35 virtual std::vector<GURL> GetSuggestionURLs( | |
36 const ntp_snippets::Category& category) = 0; | |
37 virtual PrefetchService* GetPrefetchService( | |
38 content::BrowserContext* context) = 0; | |
39 virtual ~Delegate() = default; | |
40 }; | |
41 | |
42 // This API creates a new SuggestionsObserver and adds it as an | |
43 // observer to the ContentSuggestionsService provided. Its lifetime is | |
44 // self-managed, and it deletes itself upon receiving the | |
45 // |ContentSuggestionsServiceShutdown| signal using an asynchronous | |
46 // |DeleteSoon|. | |
47 static void ObserveContentSuggestionsService( | |
48 content::BrowserContext* browser_context, | |
49 ntp_snippets::ContentSuggestionsService* service); | |
50 | |
51 SuggestionsObserver(content::BrowserContext* browser_context, | |
52 std::unique_ptr<Delegate> delegate, | |
53 const ntp_snippets::Category& category); | |
54 ~SuggestionsObserver() override; | |
55 | |
56 // ContentSuggestionsService::Observer overrides | |
jianli
2017/04/11 22:39:55
nit: end with ":"
dewittj
2017/04/12 00:22:48
Done.
| |
57 void OnNewSuggestions(ntp_snippets::Category category) override; | |
58 void OnCategoryStatusChanged( | |
59 ntp_snippets::Category category, | |
60 ntp_snippets::CategoryStatus new_status) override; | |
61 void OnSuggestionInvalidated( | |
62 const ntp_snippets::ContentSuggestion::ID& suggestion_id) override; | |
63 void OnFullRefreshRequired() override; | |
64 void ContentSuggestionsServiceShutdown() override; | |
65 | |
66 private: | |
67 std::unique_ptr<Delegate> delegate_; | |
68 content::BrowserContext* browser_context_; | |
69 ntp_snippets::CategoryStatus category_status_ = | |
70 ntp_snippets::CategoryStatus::INITIALIZING; | |
71 ntp_snippets::Category category_; | |
72 | |
73 DISALLOW_COPY_AND_ASSIGN(SuggestionsObserver); | |
74 }; | |
75 | |
76 } // namespace offline_pages | |
77 | |
78 #endif // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_SUGGESTIONS_OBSERVE R_H_ | |
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