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 COMPONENTS_OFFLINE_PAGES_CORE_MODEL_GET_PAGES_TASK_H_
6 #define COMPONENTS_OFFLINE_PAGES_CORE_MODEL_GET_PAGES_TASK_H_
7 
8 #include <vector>
9 
10 #include "base/macros.h"
11 #include "base/memory/weak_ptr.h"
12 #include "components/offline_pages/core/client_id.h"
13 #include "components/offline_pages/core/offline_page_item.h"
14 #include "components/offline_pages/core/offline_page_metadata_store.h"
15 #include "components/offline_pages/core/offline_page_types.h"
16 #include "components/offline_pages/core/page_criteria.h"
17 #include "components/offline_pages/task/task.h"
18 
19 namespace offline_pages {
20 
21 // Gets offline pages that match the criteria.
22 class GetPagesTask : public Task {
23  public:
24   // Structure defining and intermediate read result.
25   struct ReadResult {
26     ReadResult();
27     ReadResult(const ReadResult& other);
28     ~ReadResult();
29 
30     bool success = false;
31     std::vector<OfflinePageItem> pages;
32   };
33 
34   GetPagesTask(OfflinePageMetadataStore* store,
35                const PageCriteria& criteria,
36                MultipleOfflinePageItemCallback callback);
37 
38   ~GetPagesTask() override;
39 
40   // Reads and returns all pages matching |criteria|. This function reads
41   // from the database and should be called from within an
42   // |SqlStoreBase::Execute()| call.
43   static ReadResult ReadPagesWithCriteriaSync(
44       const PageCriteria& criteria,
45       sql::Database* db);
46 
47  private:
48   // Task implementation:
49   void Run() override;
50 
51   void CompleteWithResult(ReadResult result);
52 
53   OfflinePageMetadataStore* store_;
54   PageCriteria criteria_;
55   MultipleOfflinePageItemCallback callback_;
56 
57   base::WeakPtrFactory<GetPagesTask> weak_ptr_factory_{this};
58   DISALLOW_COPY_AND_ASSIGN(GetPagesTask);
59 };
60 
61 }  // namespace offline_pages
62 
63 #endif  // COMPONENTS_OFFLINE_PAGES_CORE_MODEL_GET_PAGES_TASK_H_
64