extensions/renderer/v8_schema_registry.h

   1 // Copyright 2014 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 EXTENSIONS_RENDERER_V8_SCHEMA_REGISTRY_H_
   6 #define EXTENSIONS_RENDERER_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 "gin/public/context_holder.h"
  15 #include "v8/include/v8-util.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. Will also initialize schema_cache_.
  40   v8::Handle<v8::Context> GetOrCreateContext(v8::Isolate* isolate);
  41
  42   // Cache of schemas. Created lazily by GetOrCreateContext.
  43   typedef v8::StdPersistentValueMap<std::string, v8::Object> SchemaCache;
  44   scoped_ptr<SchemaCache> schema_cache_;
  45
  46   // Single per-instance gin::ContextHolder to create v8::Values.
  47   // Created lazily via GetOrCreateContext.
  48   scoped_ptr<gin::ContextHolder> context_holder_;
  49
  50   DISALLOW_COPY_AND_ASSIGN(V8SchemaRegistry);
  51 };
  52
  53 }  // namespace extensions
  54
  55 #endif  // EXTENSIONS_RENDERER_V8_SCHEMA_REGISTRY_H_