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

   1 // Copyright 2013 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_UI_APP_LIST_SEARCH_WEBSTORE_CACHE_H_
   6 #define CHROME_BROWSER_UI_APP_LIST_SEARCH_WEBSTORE_CACHE_H_
   7
   8 #include <utility>
   9
  10 #include "base/basictypes.h"
  11 #include "base/containers/mru_cache.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/time/time.h"
  14
  15 namespace base {
  16 class DictionaryValue;
  17 }
  18
  19 namespace app_list {
  20
  21 // WebstoreCache manages the cache of webstore search results which should
  22 // be valid during an input session. This will reduce unnecessary queries
  23 // for typing backspace or so on.
  24 class WebstoreCache {
  25  public:
  26   WebstoreCache();
  27   ~WebstoreCache();
  28
  29   // Checks the current cache and returns the value for the |query| if it's
  30   // valid. Otherwise returns NULL.
  31   const base::DictionaryValue* Get(const std::string& query);
  32
  33   // Puts the new result to the query.
  34   void Put(const std::string& query, scoped_ptr<base::DictionaryValue> result);
  35
  36  private:
  37   typedef std::pair<base::Time, base::DictionaryValue*> Payload;
  38   class CacheDeletor {
  39    public:
  40     void operator()(Payload& payload);
  41   };
  42   typedef base::MRUCacheBase<std::string, Payload, CacheDeletor> Cache;
  43
  44   Cache cache_;
  45
  46   DISALLOW_COPY_AND_ASSIGN(WebstoreCache);
  47 };
  48
  49 }  // namespace app_list
  50
  51 #endif  // CHROME_BROWSER_UI_APP_LIST_SEARCH_WEBSTORE_CACHE_H_