Implement memory-persistent registration

content/browser/service_worker/service_worker_register_job.h

+// Copyright (c) 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 CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_REGISTER_JOB_H_
+#define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_REGISTER_JOB_H_
+
+#include "base/memory/weak_ptr.h"
+#include "content/browser/service_worker/service_worker_storage.h"
+
+namespace content {
+
+// A ServiceWorkerRegisterJob lives only for the lifetime of a single
+// registration or unregistration.
+class ServiceWorkerRegisterJob {
+ public:
+  typedef base::Callback<
+      void(ServiceWorkerRegisterJob*,
+           ServiceWorkerStorage::RegistrationStatus status,
+           ServiceWorkerRegistration*)> RegistrationCompleteCallback;
+
+  // All type of jobs (Register and Unregister) complete through a
+  // single call to this callback on the IO thread.
+  ServiceWorkerRegisterJob(const base::WeakPtr<ServiceWorkerStorage>& storage,
+                           const RegistrationCompleteCallback& callback);
+  ~ServiceWorkerRegisterJob();
+
+  // The Registration flow includes most or all of the following,
+  // depending on what is already registered:
+  //  - creating a ServiceWorkerRegistration instance if there isn't
+  //    already something registered
+  //  - creating a ServiceWorkerVersion for the new registration instance.
+  //  - starting a worker for the ServiceWorkerVersion
+  //  - telling the Version to evaluate the script
+  //  - firing the 'install' event at the ServiceWorkerVersion
+  //  - firing the 'activate' event at the ServiceWorkerVersion
+  //  - Waiting for older ServiceWorkerVersions to deactivate
+  //  - designating the new version to be the 'active' version
+  void StartRegister(const GURL& pattern, const GURL& script_url);
+
+  // The Unregistration process is primarily cleanup, removing
+  // everything that was created during the Registration process,
+  // including the ServiceWorkerRegistration itself.
+  void StartUnregister(const GURL& pattern);

[kinuko, 2013/11/27 03:45:23]

It's one off operation class, I think ideally having separate classes for
registration and unregistration would be clearer.

Can you clearly comment that either StartRegister and StartUnregister should be
called exactly once for each instance?

[alecflett, 2013/12/02 16:11:35]

I'd like to avoid doing that just yet. They share some code, and will likely
share more. Also, the ServiceWorkerStorage class is going to have to keep track
of multiple jobs, inspecting which jobs overlap, which means they're going to
have to share a base class in order to be treated uniformly. This means
introducing a lot (IMO) of abstraction - ServiceWorkerRegistrationJobBase,
ServiceWorkerRegisterJob, ServiceWorkerUnregisterJob, etc as well as virtual
Start() methods, etc - without an big gain. I'm happy to refactor if I'm shown
to be wrong, but can we start with a single class now?

 (there's nothing specified yet about overlapping registration vs
unregistration, but when it does, I'm fairly certain the Storage class is going
to have to inspect the jobs' patterns independent of type)
Done.

+
+ private:
+  // These are all steps in the registration and unregistration pipeline.
+  void RegisterPatternAndContinue(
+      const GURL& pattern,
+      const GURL& script_url,
+      const ServiceWorkerStorage::RegistrationCallback& callback,
+      ServiceWorkerStorage::RegistrationStatus previous_status);
+
+  void UnregisterPatternAndContinue(
+      const GURL& pattern,
+      const GURL& script_url,
+      const ServiceWorkerStorage::UnregistrationCallback& callback,
+      ServiceWorkerStorage::RegistrationStatus previous_status,
+      const scoped_refptr<ServiceWorkerRegistration>& previous_registration);
+
+  // These methods convert
+  void UnregisterComplete(ServiceWorkerStorage::RegistrationStatus status);
+  void RegisterComplete(
+      ServiceWorkerStorage::RegistrationStatus status,
+      const scoped_refptr<ServiceWorkerRegistration>& registration);
+
+  const base::WeakPtr<ServiceWorkerStorage> storage_;
+  const RegistrationCompleteCallback callback_;
+  base::WeakPtrFactory<ServiceWorkerRegisterJob> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(ServiceWorkerRegisterJob);
+};
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_REGISTER_JOB_H_