gin/per_isolate_data.h

   1 // Copyright 2013 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 GIN_PER_ISOLATE_DATA_H_
   6 #define GIN_PER_ISOLATE_DATA_H_
   7
   8 #include <map>
   9
  10 #include "base/basictypes.h"
  11 #include "gin/gin_export.h"
  12 #include "gin/public/wrapper_info.h"
  13 #include "v8/include/v8.h"
  14
  15 namespace gin {
  16
  17 // There is one instance of PerIsolateData per v8::Isolate managed by Gin. This
  18 // class stores all the Gin-related data that varies per isolate.
  19 class GIN_EXPORT PerIsolateData {
  20  public:
  21   PerIsolateData(v8::Isolate* isolate, v8::ArrayBuffer::Allocator* allocator);
  22   ~PerIsolateData();
  23
  24   static PerIsolateData* From(v8::Isolate* isolate);
  25
  26   // Each isolate is associated with a collection of v8::ObjectTemplates and
  27   // v8::FunctionTemplates. Typically these template objects are created
  28   // lazily.
  29   void SetObjectTemplate(WrapperInfo* info,
  30                          v8::Local<v8::ObjectTemplate> object_template);
  31   void SetFunctionTemplate(WrapperInfo* info,
  32                            v8::Local<v8::FunctionTemplate> function_template);
  33
  34   // These are low-level functions for retrieving object or function templates
  35   // stored in this object. Because these templates are often created lazily,
  36   // most clients should call higher-level functions that know how to populate
  37   // these templates if they haven't already been created.
  38   v8::Local<v8::ObjectTemplate> GetObjectTemplate(WrapperInfo* info);
  39   v8::Local<v8::FunctionTemplate> GetFunctionTemplate(WrapperInfo* info);
  40
  41   v8::Isolate* isolate() { return isolate_; }
  42   v8::ArrayBuffer::Allocator* allocator() { return allocator_; }
  43
  44  private:
  45   typedef std::map<
  46       WrapperInfo*, v8::Eternal<v8::ObjectTemplate> > ObjectTemplateMap;
  47   typedef std::map<
  48       WrapperInfo*, v8::Eternal<v8::FunctionTemplate> > FunctionTemplateMap;
  49
  50   // PerIsolateData doesn't actually own |isolate_|. Instead, the isolate is
  51   // owned by the IsolateHolder, which also owns the PerIsolateData.
  52   v8::Isolate* isolate_;
  53   v8::ArrayBuffer::Allocator* allocator_;
  54   ObjectTemplateMap object_templates_;
  55   FunctionTemplateMap function_templates_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(PerIsolateData);
  58 };
  59
  60 }  // namespace gin
  61
  62 #endif  // GIN_PER_ISOLATE_DATA_H_