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Unified Diff: chrome/browser/extensions/extension_settings.h

Issue 7189029: Implement an initial extension settings API. (Closed) Base URL: http://git.chromium.org/git/chromium.git@trunk
Patch Set: Make clang happy Created 9 years, 4 months ago
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Index: chrome/browser/extensions/extension_settings.h
diff --git a/chrome/browser/extensions/extension_settings.h b/chrome/browser/extensions/extension_settings.h
new file mode 100644
index 0000000000000000000000000000000000000000..1f297daa927266631b4712ab9cf190ae8068edfa
--- /dev/null
+++ b/chrome/browser/extensions/extension_settings.h
@@ -0,0 +1,98 @@
+// Copyright (c) 2011 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_EXTENSIONS_EXTENSION_SETTINGS_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_SETTINGS_H_
+#pragma once
+
+#include "base/callback.h"
+#include "base/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "chrome/browser/extensions/extension_settings_storage.h"
+
+// Manages ExtensionSettingsStorage objects for extensions.
+class ExtensionSettings : public base::RefCountedThreadSafe<ExtensionSettings> {
+ public:
+ // File path is the base of the extension settings directory.
+ // The databases will be at base_path/extension_id.
+ explicit ExtensionSettings(const FilePath& base_path);
+
+ // Callback from the GetStorage() methods.
+ typedef base::Callback<void(ExtensionSettingsStorage*)> Callback;
+
+ // Gets the storage area for a given extension. Only valid for the duration
+ // of the callback.
+ // By default this will be of a cached LEVELDB storage, but on failure to
+ // create a leveldb instance will fall back to cached NOOP storage.
+ // Callbacks will happen asynchronously regardless of whether they need to go
+ // to the FILE thread, but will always be called on the UI thread.
+ void GetStorage(const std::string& extension_id, const Callback& callback);
+
+ // Gets a storage area for a given extension with a specific type.
+ // and whether it should be wrapped in a cache.
+ // Use this for testing; if the given type fails to be created (e.g. if
+ // leveldb creation fails) then a DCHECK will fail.
+ // Callback objects will be deleted when used.
+ void GetStorageForTesting(
+ ExtensionSettingsStorage::Type type,
+ bool cached,
+ const std::string& extension_id,
+ const Callback& callback);
+
+ private:
+ friend class base::RefCountedThreadSafe<ExtensionSettings>;
+ ~ExtensionSettings();
+
+ // Attempts to get and callback with an existing storage area. Returns
+ // whether storage existed and the callback run.
+ bool GetExistingStorage(
+ const std::string& extension_id, const Callback& callback);
+
+ // Runs a Callback with a storage argument, then deletes the callback.
+ void RunWithStorage(Callback* callback, ExtensionSettingsStorage* storage);
+
+ // Starts the process of creation of a storage area.
+ // Must be run on the UI thread.
+ void StartCreationOfStorage(
+ const std::string& extension_id,
+ ExtensionSettingsStorage::Type type,
+ ExtensionSettingsStorage::Type fallback_type,
+ bool cached,
+ const Callback& callback);
+
+ // Creates a new storage area of a given type, with a fallback type if
+ // creation fails, and optionally wrapped in a cache.
+ // Must be run on the FILE thread.
+ void CreateStorageOnFileThread(
+ const std::string& extension_id,
+ ExtensionSettingsStorage::Type type,
+ ExtensionSettingsStorage::Type fallback_type,
+ bool cached,
+ const Callback& callback);
+
+ // Creates a storage area of a given type, optionally wrapped in a cache.
+ // Returns NULL if creation fails.
+ ExtensionSettingsStorage* CreateStorage(
+ const std::string& extension_id,
+ ExtensionSettingsStorage::Type type,
+ bool cached);
+
+ // End the creation of a storage area.
+ // Must be run on the UI thread.
+ void EndCreationOfStorage(
+ const std::string& extension_id,
+ ExtensionSettingsStorage* storage,
+ const Callback& callback);
+
+ // The base file path to create any leveldb databases at.
+ const FilePath base_path_;
+
+ // A cache of ExtensionSettingsStorage objects that have already been created.
+ // Ensure that there is only ever one created per extension.
+ std::map<std::string, ExtensionSettingsStorage*> storage_objs_;
+
+ DISALLOW_COPY_AND_ASSIGN(ExtensionSettings);
+};
+
+#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_SETTINGS_H_
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