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

content/browser/service_worker/service_worker_mojo_event_dispatcher.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_BROWSER_SERVICE_WORKER_SERVICE_WORKER_MOJO_EVENT_DISPATCHER_H_
+#define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_MOJO_EVENT_DISPATCHER_H_
+
+#include "base/memory/weak_ptr.h"
+#include "content/common/background_sync_service.mojom.h"
+#include "content/common/service_worker/service_worker_status_code.h"
+
+namespace content {
+
+// This class is used by ServiceWorkerVersion to fire events in the service
+// worker using mojo IPC. It owns an InterfacePtr to each service, which it will
+// construct as necessary.
+//
+// This class should only be called on the IO thread.
+class ServiceWorkerMojoEventDispatcher {
+ public:
+  using StatusCallback = base::Callback<void(ServiceWorkerStatusCode)>;
+
+  ServiceWorkerMojoEventDispatcher();
+  ~ServiceWorkerMojoEventDispatcher();
+
+  // Dispatches the event, establishing a connection to the mojo service if
+  // necessary, and then runs |callback| with the result.
+  void DispatchSyncEvent(int render_process_id,
+                         int thread_id,
+                         const StatusCallback& callback);
+
+ private:
+  void BindChannelAndDispatchSyncEvent(
+      int thread_id,
+      const StatusCallback& callback,
+      mojo::InterfacePtrInfo<BackgroundSyncServiceClient> ptri);
+  void DispatchSyncEventInternal(int thread_id, const StatusCallback& callback);
+
+  void OnEventFinished(const StatusCallback& callback,
+                       ServiceWorkerEventStatus result);
+
+  BackgroundSyncServiceClientPtr background_sync_client_;
+
+  base::WeakPtrFactory<ServiceWorkerMojoEventDispatcher> weak_ptr_factory_;

[michaeln, 2015/06/24 00:12:01]

The name 'weak_factory_' is used consistently for this in the /service_worker
directory, for consistency it'd be good to do that here too.

[iclelland, 2015/06/24 14:29:30]

Done.

+
+  DISALLOW_COPY_AND_ASSIGN(ServiceWorkerMojoEventDispatcher);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_MOJO_EVENT_DISPATCHER_H_