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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GIN_MODULES_MODULE_REGISTRY_H_
#define GIN_MODULES_MODULE_REGISTRY_H_
#include <list>
#include <map>
#include <set>
#include <string>
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "base/observer_list.h"
#include "gin/gin_export.h"
#include "v8/include/v8.h"
namespace gin {
class ModuleRegistryObserver;
struct PendingModule;
// This class implements the Asynchronous Module Definition (AMD) API.
// https://github.com/amdjs/amdjs-api/wiki/AMD
//
// Our implementation isn't complete yet. Missing features:
// 1) Built-in support for require, exports, and module.
// 2) Path resoltuion in module names.
//
// For these reasons, we don't have an "amd" property on the "define"
// function. The spec says we should only add that property once our
// implementation complies with the specification.
//
class GIN_EXPORT ModuleRegistry {
public:
typedef base::Callback<void (v8::Local<v8::Value>)> LoadModuleCallback;
virtual ~ModuleRegistry();
static ModuleRegistry* From(v8::Local<v8::Context> context);
static void RegisterGlobals(v8::Isolate* isolate,
v8::Local<v8::ObjectTemplate> templ);
// Installs the necessary functions needed for modules.
// WARNING: this may execute script in the page.
static bool InstallGlobals(v8::Isolate* isolate, v8::Local<v8::Object> obj);
void AddObserver(ModuleRegistryObserver* observer);
void RemoveObserver(ModuleRegistryObserver* observer);
// The caller must have already entered our context.
void AddBuiltinModule(v8::Isolate* isolate, const std::string& id,
v8::Local<v8::Value> module);
// The caller must have already entered our context.
void AddPendingModule(v8::Isolate* isolate,
scoped_ptr<PendingModule> pending);
void LoadModule(v8::Isolate* isolate,
const std::string& id,
LoadModuleCallback callback);
// The caller must have already entered our context.
void AttemptToLoadMoreModules(v8::Isolate* isolate);
const std::set<std::string>& available_modules() const {
return available_modules_;
}
const std::set<std::string>& unsatisfied_dependencies() const {
return unsatisfied_dependencies_;
}
private:
typedef ScopedVector<PendingModule> PendingModuleVector;
typedef std::multimap<std::string, LoadModuleCallback> LoadModuleCallbackMap;
explicit ModuleRegistry(v8::Isolate* isolate);
bool Load(v8::Isolate* isolate, scoped_ptr<PendingModule> pending);
bool RegisterModule(v8::Isolate* isolate,
const std::string& id,
v8::Local<v8::Value> module);
bool CheckDependencies(PendingModule* pending);
bool AttemptToLoad(v8::Isolate* isolate, scoped_ptr<PendingModule> pending);
v8::Local<v8::Value> GetModule(v8::Isolate* isolate, const std::string& id);
std::set<std::string> available_modules_;
std::set<std::string> unsatisfied_dependencies_;
LoadModuleCallbackMap waiting_callbacks_;
PendingModuleVector pending_modules_;
v8::Persistent<v8::Object> modules_;
ObserverList<ModuleRegistryObserver> observer_list_;
DISALLOW_COPY_AND_ASSIGN(ModuleRegistry);
};
} // namespace gin
#endif // GIN_MODULES_MODULE_REGISTRY_H_