gin/modules/module_registry.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_MODULES_MODULE_REGISTRY_H_
   6 #define GIN_MODULES_MODULE_REGISTRY_H_
   7
   8 #include <list>
   9 #include <map>
  10 #include <set>
  11 #include <string>
  12
  13 #include "base/callback.h"
  14 #include "base/compiler_specific.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/memory/scoped_vector.h"
  17 #include "base/observer_list.h"
  18 #include "gin/gin_export.h"
  19 #include "v8/include/v8.h"
  20
  21 namespace gin {
  22
  23 class ModuleRegistryObserver;
  24 struct PendingModule;
  25
  26 // This class implements the Asynchronous Module Definition (AMD) API.
  27 // https://github.com/amdjs/amdjs-api/wiki/AMD
  28 //
  29 // Our implementation isn't complete yet. Missing features:
  30 //   1) Built-in support for require, exports, and module.
  31 //   2) Path resoltuion in module names.
  32 //
  33 // For these reasons, we don't have an "amd" property on the "define"
  34 // function. The spec says we should only add that property once our
  35 // implementation complies with the specification.
  36 //
  37 class GIN_EXPORT ModuleRegistry {
  38  public:
  39   typedef base::Callback<void (v8::Handle<v8::Value>)> LoadModuleCallback;
  40
  41   virtual ~ModuleRegistry();
  42
  43   static ModuleRegistry* From(v8::Handle<v8::Context> context);
  44
  45   static void RegisterGlobals(v8::Isolate* isolate,
  46                               v8::Handle<v8::ObjectTemplate> templ);
  47
  48   // Installs the necessary functions needed for modules.
  49   // WARNING: this may execute script in the page.
  50   static void InstallGlobals(v8::Isolate* isolate, v8::Handle<v8::Object> obj);
  51
  52   void AddObserver(ModuleRegistryObserver* observer);
  53   void RemoveObserver(ModuleRegistryObserver* observer);
  54
  55   // The caller must have already entered our context.
  56   void AddBuiltinModule(v8::Isolate* isolate, const std::string& id,
  57                         v8::Handle<v8::Value> module);
  58
  59   // The caller must have already entered our context.
  60   void AddPendingModule(v8::Isolate* isolate,
  61                         scoped_ptr<PendingModule> pending);
  62
  63   void LoadModule(v8::Isolate* isolate,
  64                   const std::string& id,
  65                   LoadModuleCallback callback);
  66
  67   // The caller must have already entered our context.
  68   void AttemptToLoadMoreModules(v8::Isolate* isolate);
  69
  70   const std::set<std::string>& available_modules() const {
  71     return available_modules_;
  72   }
  73
  74   const std::set<std::string>& unsatisfied_dependencies() const {
  75     return unsatisfied_dependencies_;
  76   }
  77
  78  private:
  79   typedef ScopedVector<PendingModule> PendingModuleVector;
  80   typedef std::map<std::string, LoadModuleCallback> LoadModuleCallbackMap;
  81
  82   explicit ModuleRegistry(v8::Isolate* isolate);
  83
  84   void Load(v8::Isolate* isolate, scoped_ptr<PendingModule> pending);
  85   void RegisterModule(v8::Isolate* isolate,
  86                       const std::string& id,
  87                       v8::Handle<v8::Value> module);
  88
  89   bool CheckDependencies(PendingModule* pending);
  90   bool AttemptToLoad(v8::Isolate* isolate, scoped_ptr<PendingModule> pending);
  91
  92   v8::Handle<v8::Value> GetModule(v8::Isolate* isolate, const std::string& id);
  93
  94   std::set<std::string> available_modules_;
  95   std::set<std::string> unsatisfied_dependencies_;
  96
  97   LoadModuleCallbackMap waiting_callbacks_;
  98
  99   PendingModuleVector pending_modules_;
 100   v8::Persistent<v8::Object> modules_;
 101
 102   ObserverList<ModuleRegistryObserver> observer_list_;
 103
 104   DISALLOW_COPY_AND_ASSIGN(ModuleRegistry);
 105 };
 106
 107 }  // namespace gin
 108
 109 #endif  // GIN_MODULES_MODULE_REGISTRY_H_