ServiceWorker: Carve out methods of ServiceWorkerProviderContext to delegate classes

content/child/service_worker/service_worker_provider_context.h

 // Copyright 2014 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 CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_PROVIDER_CONTEXT_H_
 #define CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_PROVIDER_CONTEXT_H_
 
 #include <set>
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/sequenced_task_runner_helpers.h"
-#include "base/synchronization/lock.h"
 #include "content/common/service_worker/service_worker_types.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace content {
 
 class ServiceWorkerHandleReference;
 class ServiceWorkerRegistrationHandleReference;
 struct ServiceWorkerProviderContextDeleter;
 class ThreadSafeSender;
 
 // An instance of this class holds information related to Document/Worker.
 // Created and destructed on the main thread. Unless otherwise noted, all
-// methods are called on the main thread.
+// methods are called on the main thread. The lifetime of this class is equals
+// to the corresponding ServiceWorkerNetworkProvider.
+//
+// The role of this class varies for controllees and controllers:
+//  - For controllees, this is used for keeping the associated registration and
+//    the controller alive to create controllee's ServiceWorkerContainer. The
+//    references to them are kept until OnDisassociateRegistration() is called
+//    or OnSetControllerServiceWorker() is called with an invalid worker info.
+//  - For controllers, this is used for keeping the associated registration and
+//    its versions alive to create controller's ServiceWorkerGlobalScope. The
+//    references to them are kept until OnDisassociateRegistration() is called.
+//
+// These operations are actually done in delegate classes owned by this class:
+// ControlleeDelegate and ControllerDelegate.
 class ServiceWorkerProviderContext
     : public base::RefCountedThreadSafe<ServiceWorkerProviderContext,
                                         ServiceWorkerProviderContextDeleter> {
  public:
-  explicit ServiceWorkerProviderContext(int provider_id);
+  ServiceWorkerProviderContext(int provider_id,
+                               ServiceWorkerProviderType provider_type);
 
   // Called from ServiceWorkerDispatcher.
   void OnAssociateRegistration(const ServiceWorkerRegistrationObjectInfo& info,
                                const ServiceWorkerVersionAttributes& attrs);
   void OnDisassociateRegistration();
   void OnSetControllerServiceWorker(const ServiceWorkerObjectInfo& info);
 
+  // Called on the worker thread. Used for initializing
+  // ServiceWorkerGlobalScope.
+  void GetAssociatedRegistration(ServiceWorkerRegistrationObjectInfo* info,
+                                 ServiceWorkerVersionAttributes* attrs);
+
   int provider_id() const { return provider_id_; }
 
   ServiceWorkerHandleReference* controller();
 
-  // Called on the worker thread.
-  bool GetRegistrationInfoAndVersionAttributes(
-      ServiceWorkerRegistrationObjectInfo* info,
-      ServiceWorkerVersionAttributes* attrs);
-
  private:
   friend class base::DeleteHelper<ServiceWorkerProviderContext>;
   friend class base::RefCountedThreadSafe<ServiceWorkerProviderContext,
                                           ServiceWorkerProviderContextDeleter>;
   friend struct ServiceWorkerProviderContextDeleter;
 
+  class Delegate;
+  class ControlleeDelegate;
+  class ControllerDelegate;
+
   ~ServiceWorkerProviderContext();
   void DestructOnMainThread() const;
 
   const int provider_id_;
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
 
-  // Protects (installing, waiting, active) worker and registration references.
-  base::Lock lock_;
-
-  // Used on both the main thread and the worker thread.
-  scoped_ptr<ServiceWorkerHandleReference> installing_;
-  scoped_ptr<ServiceWorkerHandleReference> waiting_;
-  scoped_ptr<ServiceWorkerHandleReference> active_;
-  scoped_ptr<ServiceWorkerRegistrationHandleReference> registration_;
-
-  // Used only on the main thread.
-  scoped_ptr<ServiceWorkerHandleReference> controller_;
+  scoped_ptr<Delegate> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerProviderContext);
 };
 
 struct ServiceWorkerProviderContextDeleter {
   static void Destruct(const ServiceWorkerProviderContext* context) {
     context->DestructOnMainThread();
   }
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_PROVIDER_CONTEXT_H_