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1 // Copyright (c) 2012 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_EXTENSIONS_SETTINGS_VALUE_STORE_CACHE_H_ | |
6 #define CHROME_BROWSER_EXTENSIONS_SETTINGS_VALUE_STORE_CACHE_H_ | |
7 | |
8 #include <string> | |
9 | |
10 #include "base/callback.h" | |
11 #include "base/memory/ref_counted.h" | |
12 | |
13 class ValueStore; | |
14 | |
15 namespace extensions { | |
16 | |
17 class Extension; | |
18 | |
19 // Each namespace of the storage API implements this interface. | |
20 // Instances are created on the UI thread, but from then on live on the FILE | |
21 // thread. At shutdown, ShutdownOnUI() is first invoked on the UI thread, and | |
22 // the destructor is invoked soon after on the FILE thread. This gives | |
23 // implementations the chance to work with ValueStores on FILE but observe | |
24 // events on UI. | |
25 // It also means that any methods invoked on UI *before ShutdownOnUI()* can | |
26 // safely post other methods to the FILE thread, since the deletion task is only | |
27 // posted to FILE after ShutdownOnUI(). | |
28 class ValueStoreCache { | |
29 public: | |
30 typedef base::Callback<void(ValueStore*)> StorageCallback; | |
31 | |
32 // Invoked on FILE. | |
33 virtual ~ValueStoreCache(); | |
34 | |
35 // This is invoked from the UI thread during destruction of the Profile that | |
36 // ultimately owns this object. Any Profile-related cleanups should be | |
37 // performed in this method, since the destructor will execute later, after | |
38 // the Profile is already gone. | |
39 virtual void ShutdownOnUI(); | |
40 | |
41 // Requests the cache to invoke |callback| with the appropriate ValueStore | |
42 // for the given |extension|. |callback| should be invoked with a NULL | |
43 // ValueStore in case of errors. | |
44 // |extension| is passed in a scoped_refptr<> because this method is | |
45 // asynchronously posted as a task to the loop returned by GetMessageLoop(), | |
46 // and this guarantees the Extension is still valid when the method executes. | |
47 virtual void RunWithValueStoreForExtension( | |
48 const StorageCallback& callback, | |
49 scoped_refptr<const Extension> extension) = 0; | |
50 | |
51 // Requests the cache to delete any storage used by |extension_id|. | |
52 virtual void DeleteStorageSoon(const std::string& extension_id) = 0; | |
53 }; | |
54 | |
55 } // namespace extensions | |
56 | |
57 #endif // CHROME_BROWSER_EXTENSIONS_SETTINGS_VALUE_STORE_CACHE_H_ | |
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