ServiceWorker: Implement updatefound event and version attributes (Chromium)

content/browser/service_worker/service_worker_registration_handle.cc

+// 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.
+
+#include "content/browser/service_worker/service_worker_registration_handle.h"
+
+#include "content/browser/service_worker/service_worker_context_core.h"
+#include "content/browser/service_worker/service_worker_dispatcher_host.h"
+#include "content/browser/service_worker/service_worker_handle.h"
+#include "content/common/service_worker/service_worker_messages.h"
+
+namespace content {
+
+ServiceWorkerRegistrationHandle::ServiceWorkerRegistrationHandle(
+    base::WeakPtr<ServiceWorkerContextCore> context,
+    ServiceWorkerDispatcherHost* dispatcher_host,
+    int thread_id,
+    int provider_id,
+    ServiceWorkerRegistration* registration)
+    : context_(context),
+      dispatcher_host_(dispatcher_host),
+      thread_id_(thread_id),
+      provider_id_(provider_id),
+      handle_id_(context ? context->GetNewRegistrationHandleId()
+                         : kInvalidServiceWorkerRegistrationHandleId),
+      ref_count_(1),
+      registration_(registration) {
+  DCHECK(registration_);
+  SetVersionAttributes(registration->installing_version(),
+                       registration->waiting_version(),
+                       registration->active_version());
+  registration_->AddListener(this);
+}
+
+ServiceWorkerRegistrationHandle::~ServiceWorkerRegistrationHandle() {
+  registration_->RemoveListener(this);
+}
+
+void ServiceWorkerRegistrationHandle::IncrementRefCount() {
+  DCHECK_GT(ref_count_, 0);
+  ++ref_count_;
+}
+
+void ServiceWorkerRegistrationHandle::DecrementRefCount() {
+  DCHECK_GT(ref_count_, 0);
+  --ref_count_;
+}
+
+void ServiceWorkerRegistrationHandle::OnVersionAttributesChanged(
+    ServiceWorkerRegistration* registration,
+    ChangedVersionAttributesMask changed_mask,
+    const ServiceWorkerRegistrationInfo& info) {
+  DCHECK_EQ(registration->id(), registration_->id());
+  SetVersionAttributes(registration->installing_version(),
+                       registration->waiting_version(),
+                       registration->active_version());
+}
+
+void ServiceWorkerRegistrationHandle::OnRegistrationFailed(
+    ServiceWorkerRegistration* registration) {
+  DCHECK_EQ(registration->id(), registration_->id());
+  ClearVersionAttributes();
+  registration_->RemoveListener(this);
+  registration_ = NULL;
+}
+
+void ServiceWorkerRegistrationHandle::SetVersionAttributes(
+    ServiceWorkerVersion* installing_version,
+    ServiceWorkerVersion* waiting_version,
+    ServiceWorkerVersion* active_version) {
+  ChangedVersionAttributesMask mask;
+
+  if (installing_version != installing_version_) {
+    installing_version_ = installing_version;
+    mask.add(ChangedVersionAttributesMask::INSTALLING_VERSION);
+  }
+  if (waiting_version != waiting_version_) {
+    waiting_version_ = waiting_version;
+    mask.add(ChangedVersionAttributesMask::WAITING_VERSION);
+  }
+  if (active_version != active_version_) {
+    active_version_ = active_version;
+    mask.add(ChangedVersionAttributesMask::ACTIVE_VERSION);
+  }
+
+  if (!dispatcher_host_)
+    return;  // Could be NULL in some tests.
+  if (!mask.changed())
+    return;
+
+  ServiceWorkerVersionAttributes attributes;
+  if (mask.installing_changed()) {
+    attributes.installing =
+        CreateServiceWorkerHandleAndPass(installing_version);
+  }
+  if (mask.waiting_changed()) {
+    attributes.waiting =
+        CreateServiceWorkerHandleAndPass(waiting_version);
+  }
+  if (mask.active_changed()) {
+    attributes.active =
+        CreateServiceWorkerHandleAndPass(active_version);
+  }
+
+  dispatcher_host_->Send(new ServiceWorkerMsg_SetVersionAttributes(
+      thread_id_, provider_id_, handle_id_, mask.changed(), attributes));
+}
+
+void ServiceWorkerRegistrationHandle::ClearVersionAttributes() {
+  SetVersionAttributes(NULL, NULL, NULL);
+}
+
+ServiceWorkerObjectInfo
+ServiceWorkerRegistrationHandle::CreateServiceWorkerHandleAndPass(
+    ServiceWorkerVersion* version) {
+  ServiceWorkerObjectInfo info;
+  if (context_ && version) {
+    scoped_ptr<ServiceWorkerHandle> handle =
+        ServiceWorkerHandle::Create(context_,

[michaeln, 2014/08/13 04:18:16]

does it matter that we create a new handle instance as workers migrate from
installing to waiting to active?

hmmmm, i guess these get dedupped on the client-side (how non-obvious)

[falken, 2014/08/13 08:27:06]

I don't think they get dedupped. This is
https://code.google.com/p/chromium/issues/detail?id=400602

+                                    dispatcher_host_,
+                                    thread_id_,
+                                    provider_id_,
+                                    version);
+    info = handle->GetObjectInfo();
+    dispatcher_host_->RegisterServiceWorkerHandle(handle.Pass());
+  }
+  return info;
+}
+
+}  // namespace content