| // Copyright (c) 2012 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_REQUIREMENTS_CHECKER_H_ |
| #define CHROME_BROWSER_EXTENSIONS_REQUIREMENTS_CHECKER_H_ |
| |
| #include <vector> |
| |
| #include "base/callback.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/memory/weak_ptr.h" |
| #include "chrome/browser/extensions/extension_service.h" |
| |
| class GPUFeatureChecker; |
| |
| namespace extensions { |
| class Extension; |
| |
| // Validates the 'requirements' extension manifest field. This is an |
| // asynchronous process that involves several threads, but the public interface |
| // of this class (including constructor and destructor) must only be used on |
| // the UI thread. |
| class RequirementsChecker : public base::SupportsWeakPtr<RequirementsChecker> { |
| public: |
| RequirementsChecker(); |
| ~RequirementsChecker(); |
| |
| // The vector passed to the callback are any localized errors describing |
| // requirement violations. If this vector is non-empty, requirements checking |
| // failed. This should only be called once. |callback| will always be invoked |
| // asynchronously on the UI thread. |callback| will only be called once, and |
| // will be reset after called. |
| void Check(scoped_refptr<const Extension> extension, |
| base::Callback<void(std::vector<std::string> requirement)> callback); |
| |
| private: |
| // Callbacks for the GPUFeatureChecker. |
| void SetWebGLAvailability(bool available); |
| void SetCSS3DAvailability(bool available); |
| |
| void MaybeRunCallback(); |
| |
| std::vector<std::string> errors_; |
| |
| // Every requirement that needs to be resolved asynchronously will add to |
| // this counter. When the counter is depleted, the callback will be run. |
| int pending_requirement_checks_; |
| |
| scoped_refptr<GPUFeatureChecker> webgl_checker_; |
| scoped_refptr<GPUFeatureChecker> css3d_checker_; |
| |
| base::Callback<void(std::vector<std::string> requirement_errorss)> callback_; |
| }; |
| |
| } // namespace extensions |
| |
| #endif // CHROME_BROWSER_EXTENSIONS_REQUIREMENTS_CHECKER_H_ |