app_list: Search result launch history and boost.

chrome/browser/ui/app_list/search/history_data_store.h

Index: chrome/browser/ui/app_list/search/history_data_store.h
diff --git a/chrome/browser/ui/app_list/search/history_data_store.h b/chrome/browser/ui/app_list/search/history_data_store.h
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+++ b/chrome/browser/ui/app_list/search/history_data_store.h
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+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_UI_APP_LIST_SEARCH_HISTORY_DATA_STORE_H_
+#define CHROME_BROWSER_UI_APP_LIST_SEARCH_HISTORY_DATA_STORE_H_
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/callback_forward.h"
+#include "base/files/file_path.h"
+#include "base/files/important_file_writer.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/ui/app_list/search/history_data.h"
+
+namespace base {
+class DictionaryValue;
+class SequencedTaskRunner;
+}
+
+namespace app_list {
+
+namespace test {
+class HistoryDataStoreTest;
+}
+
+// A simple json store to persist HistoryData.
+class HistoryDataStore : public base::RefCountedThreadSafe<HistoryDataStore>,
+                         public base::ImportantFileWriter::DataSerializer {
+ public:
+  typedef base::Callback<void(scoped_ptr<HistoryData::Associations>)>
+      OnLoadedCallback;
+  typedef base::Closure OnFlushedCallback;
+
+  explicit HistoryDataStore(const base::FilePath& data_file);
+
+  // Flushes pending writes. |on_flushed| is invoked when disk write is
+  // finished.
+  void Flush(const OnFlushedCallback& on_flushed);
+
+  // Reads the persisted data from disk asynchronously. |on_read| is called
+  // with the loaded and parsed data. If there is an error, |on_read| is called
+  // without data.
+  void Load(const OnLoadedCallback& on_loaded);
+
+  // Incremental changes allowed on the data store.
+  void SetPrimary(const std::string& query, const std::string& result);
+  void SetSecondary(const std::string& query,
+                    const HistoryData::SecondaryDeque& results);
+  void SetUpdateTime(const std::string& query, const base::Time& update_time);
+  void Delete(const std::string& query);
+
+ private:
+  friend class base::RefCountedThreadSafe<HistoryDataStore>;
+  friend class app_list::test::HistoryDataStoreTest;
+
+  virtual ~HistoryDataStore();
+
+  // Gets the dictionary for "associations" key.
+  base::DictionaryValue* GetAssociationDict();
+
+  // Gets entry dictionary for given |query|. Creates one if necessary.
+  base::DictionaryValue* GetEntryDict(const std::string& query);
+
+  // Reads data from backing file.
+  scoped_ptr<HistoryData::Associations> LoadOnBlockingPool();
+
+  // ImportantFileWriter::DataSerializer overrides:
+  virtual bool SerializeData(std::string* data) OVERRIDE;
+
+  base::FilePath data_file_;
+  scoped_refptr<base::SequencedTaskRunner> file_task_runner_;
+  scoped_ptr<base::ImportantFileWriter> writer_;
+
+  // Cached json dictionary to serve read and incremental change calls.
+  scoped_ptr<base::DictionaryValue> cached_json_;
+
+  DISALLOW_COPY_AND_ASSIGN(HistoryDataStore);
+};
+
+}  // namespace app_list
+
+#endif  // CHROME_BROWSER_UI_APP_LIST_SEARCH_HISTORY_DATA_STORE_H_