chrome/renderer/extensions/v8_schema_registry.h

   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 <set>
  10 #include <string>
  11
  12 #include "base/basictypes.h"
  13 #include "chrome/renderer/extensions/scoped_persistent.h"
  14 #include "v8/include/v8.h"
  15
  16 namespace extensions {
  17
  18 // A registry for the v8::Value representations of extension API schemas.
  19 // In a way, the v8 counterpart to ExtensionAPI.
  20 class V8SchemaRegistry {
  21  public:
  22   V8SchemaRegistry();
  23   ~V8SchemaRegistry();
  24
  25   // Returns a v8::Array with all the schemas for the APIs in |apis|.
  26   v8::Handle<v8::Array> GetSchemas(const std::set<std::string>& apis);
  27
  28   // Returns a v8::Object for the schema for |api|, possibly from the cache.
  29   v8::Handle<v8::Object> GetSchema(const std::string& api);
  30
  31  private:
  32   // Gets the separate context that backs the registry, creating a new one if
  33   // if necessary.
  34   v8::Handle<v8::Context> GetOrCreateContext();
  35
  36   // Cache of schemas.
  37   typedef std::map<std::string, v8::Persistent<v8::Object> > SchemaCache;
  38   SchemaCache schema_cache_;
  39
  40   // Single per-instance v8::Context to create v8::Values.
  41   // Created lazily via GetOrCreateContext.
  42   ScopedPersistent<v8::Context> context_;
  43
  44   DISALLOW_COPY_AND_ASSIGN(V8SchemaRegistry);
  45 };
  46
  47 }  // namespace extensions
  48
  49 #endif  // CHROME_RENDERER_EXTENSIONS_V8_SCHEMA_REGISTRY_H_