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_RENDERER_EXTENSIONS_V8_SCHEMA_REGISTRY_H_ 6 #define CHROME_RENDERER_EXTENSIONS_V8_SCHEMA_REGISTRY_H_ 7 8 #include <map> 9 #include <string> 10 #include <vector> 11 12 #include "base/basictypes.h" 13 #include "base/memory/scoped_ptr.h" 14 #include "chrome/renderer/extensions/scoped_persistent.h" 15 #include "chrome/renderer/extensions/unsafe_persistent.h" 16 #include "v8/include/v8.h" 17 18 namespace extensions { 19 class NativeHandler; 20 21 // A registry for the v8::Value representations of extension API schemas. 22 // In a way, the v8 counterpart to ExtensionAPI. 23 class V8SchemaRegistry { 24 public: 25 V8SchemaRegistry(); 26 ~V8SchemaRegistry(); 27 28 // Creates a NativeHandler wrapper |this|. Supports GetSchema. 29 scoped_ptr<NativeHandler> AsNativeHandler(); 30 31 // Returns a v8::Array with all the schemas for the APIs in |apis|. 32 v8::Handle<v8::Array> GetSchemas(const std::vector<std::string>& apis); 33 34 // Returns a v8::Object for the schema for |api|, possibly from the cache. 35 v8::Handle<v8::Object> GetSchema(const std::string& api); 36 37 private: 38 // Gets the separate context that backs the registry, creating a new one if 39 // if necessary. 40 v8::Handle<v8::Context> GetOrCreateContext(v8::Isolate* isolate); 41 42 // Cache of schemas. 43 // 44 // Storing UnsafePersistents is safe here, because the corresponding 45 // Persistent handle is created in GetSchema(), and it keeps the data pointed 46 // by the UnsafePersistent alive. It's not made weak or disposed, and nobody 47 // else has access to it. The Persistent is then disposed in the dtor. 48 typedef std::map<std::string, UnsafePersistent<v8::Object> > SchemaCache; 49 SchemaCache schema_cache_; 50 51 // Single per-instance v8::Context to create v8::Values. 52 // Created lazily via GetOrCreateContext. 53 ScopedPersistent<v8::Context> context_; 54 55 DISALLOW_COPY_AND_ASSIGN(V8SchemaRegistry); 56 }; 57 58 } // namespace extensions 59 60 #endif // CHROME_RENDERER_EXTENSIONS_V8_SCHEMA_REGISTRY_H_ 61
