[Background Sync] Use Mojo IPC to fire background sync events

content/renderer/background_sync/background_sync_client_impl.h

+// Copyright 2015 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_RENDERER_BACKGROUND_SYNC_BACKGROUND_SYNC_CLIENT_IMPL_H_
+#define CONTENT_RENDERER_BACKGROUND_SYNC_BACKGROUND_SYNC_CLIENT_IMPL_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "content/common/background_sync_service.mojom.h"
+#include "content/common/content_export.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/strong_binding.h"
+
+namespace content {
+
+using SyncCallback = mojo::Callback<void(ServiceWorkerEventStatus)>;
+
+// This class implements the mojo service for firing background sync events in a
+// service worker thread. It is constructed and lives on the renderer main
+// thread, but can dispatch to any worker thread to fire events.
+// Return messages from the workers are rerouted to the main thread in order to
+// be sent back over the mojo message channel.
+class CONTENT_EXPORT BackgroundSyncClientImpl
+    : public NON_EXPORTED_BASE(BackgroundSyncServiceClient) {
+ public:
+  static void Create(
+      const scoped_refptr<base::SingleThreadTaskRunner>&
+          main_thread_task_runner,
+      mojo::InterfaceRequest<BackgroundSyncServiceClient> request);
+
+  ~BackgroundSyncClientImpl() override;
+
+ private:
+  explicit BackgroundSyncClientImpl(
+      const scoped_refptr<base::SingleThreadTaskRunner>&
+          main_thread_task_runner,
+      mojo::InterfaceRequest<BackgroundSyncServiceClient> request);
+
+  // BackgroundSyncClient methods:
+  void Sync(content::SyncRegistrationPtr registration,
+            int thread_id,
+            const SyncCallback& callback) override;
+
+  static void DispatchSyncForWorker(
+      const scoped_refptr<base::SingleThreadTaskRunner>&
+          main_thread_task_runner,
+      content::SyncRegistrationPtr event,
+      const SyncCallback& callback);
+  static void OnSyncComplete(const scoped_refptr<base::SingleThreadTaskRunner>&
+                                 main_thread_task_runner,
+                             const SyncCallback& callback,
+                             ServiceWorkerEventStatus status);
+  static void OnSyncCompleteOnMainThread(const SyncCallback& callback,
+                                         ServiceWorkerEventStatus status);
+
+  mojo::StrongBinding<BackgroundSyncServiceClient> binding_;
+
+  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
+
+  base::WeakPtrFactory<BackgroundSyncClientImpl> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(BackgroundSyncClientImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_BACKGROUND_SYNC_BACKGROUND_SYNC_CLIENT_IMPL_H_