Use mojo to connect to BackgroundSyncManager object

content/child/background_sync/background_sync_provider_thread_proxy.cc

-// 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.
-
-#include "content/child/background_sync/background_sync_provider_thread_proxy.h"
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/lazy_instance.h"
-#include "base/location.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/single_thread_task_runner.h"
-#include "base/threading/thread_local.h"
-#include "content/child/background_sync/background_sync_provider.h"
-
-using base::LazyInstance;
-using base::ThreadLocalPointer;
-
-namespace content {
-
-namespace {
-
-template <typename T>
-struct WebCallbacksMatcher;
-
-template <typename Stype, typename Ttype>
-struct WebCallbacksMatcher<blink::WebCallbacks<Stype, Ttype>> {
-  using S = Stype;
-  using T = Ttype;
-  using WebCallbacks = typename blink::WebCallbacks<S, T>;
-};
-
-// CallbackThreadAdapter<WebCallbacks<S, T>> is a wrapper for WebCallbacks<S, T>
-// which switches to a specific thread before calling the wrapped callback's
-// onSuccess or onError methods.
-//
-// Takes ownership of the WebCallbacks object which it wraps.
-template <typename X>
-class CallbackThreadAdapter : public WebCallbacksMatcher<X>::WebCallbacks {
-  using S = typename WebCallbacksMatcher<X>::S;
-  using T = typename WebCallbacksMatcher<X>::T;
-  using OnSuccessType = void (blink::WebCallbacks<S, T>::*)(S);
-  using OnErrorType = void (blink::WebCallbacks<S, T>::*)(T);
-
- public:
-  CallbackThreadAdapter(scoped_ptr<blink::WebCallbacks<S, T>> callbacks,
-                        int worker_thread_id)
-      : worker_thread_id_(worker_thread_id) {
-    callbacks_.reset(callbacks.release());
-  }
-
-  virtual void onSuccess(S results) {
-    OnSuccessType on_success = &blink::WebCallbacks<S, T>::onSuccess;
-    // If the worker thread has been destroyed, then this task will be
-    // silently discarded.
-    WorkerTaskRunner::Instance()->PostTask(
-        worker_thread_id_,
-        base::Bind(on_success, base::Owned(callbacks_.release()), results));
-  }
-
-  virtual void onError(T error) {
-    OnErrorType on_error = &blink::WebCallbacks<S, T>::onError;
-    // If the worker thread has been destroyed, then this task will be
-    // silently discarded.
-    WorkerTaskRunner::Instance()->PostTask(
-        worker_thread_id_,
-        base::Bind(on_error, base::Owned(callbacks_.release()), error));
-  }
-
- private:
-  scoped_ptr<blink::WebCallbacks<S, T>> callbacks_;
-  int worker_thread_id_;
-};
-
-LazyInstance<ThreadLocalPointer<BackgroundSyncProviderThreadProxy>>::Leaky
-    g_sync_provider_tls = LAZY_INSTANCE_INITIALIZER;
-
-void DuplicateRegistrationHandleCallbackOnSWThread(
-    const BackgroundSyncProviderThreadProxy::
-        DuplicateRegistrationHandleCallback& callback,
-    BackgroundSyncError error,
-    SyncRegistrationPtr registration) {
-  callback.Run(error, registration.Pass());
-}
-
-void DuplicateRegistrationHandleCallbackOnMainThread(
-    int worker_thread_id,
-    const BackgroundSyncProviderThreadProxy::
-        DuplicateRegistrationHandleCallback& callback,
-    BackgroundSyncError error,
-    SyncRegistrationPtr registration) {
-  WorkerTaskRunner::Instance()->PostTask(
-      worker_thread_id,
-      base::Bind(&DuplicateRegistrationHandleCallbackOnSWThread, callback,
-                 error, base::Passed(registration.Pass())));
-}
-
-}  // anonymous namespace
-
-// static
-BackgroundSyncProviderThreadProxy*
-BackgroundSyncProviderThreadProxy::GetThreadInstance(
-    base::SingleThreadTaskRunner* main_thread_task_runner,
-    BackgroundSyncProvider* sync_provider) {
-  if (g_sync_provider_tls.Pointer()->Get())
-    return g_sync_provider_tls.Pointer()->Get();
-
-  if (!WorkerThread::GetCurrentId()) {
-    // This could happen if GetThreadInstance is called very late (say by a
-    // garbage collected SyncRegistration).
-    return nullptr;
-  }
-
-  BackgroundSyncProviderThreadProxy* instance =
-      new BackgroundSyncProviderThreadProxy(main_thread_task_runner,
-                                            sync_provider);
-  WorkerThread::AddObserver(instance);
-  return instance;
-}
-
-void BackgroundSyncProviderThreadProxy::registerBackgroundSync(
-    const blink::WebSyncRegistration* options,
-    blink::WebServiceWorkerRegistration* service_worker_registration,
-    bool requested_from_service_worker,
-    blink::WebSyncRegistrationCallbacks* callbacks) {
-  DCHECK(options);
-  DCHECK(service_worker_registration);
-  DCHECK(callbacks);
-  main_thread_task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(
-          &BackgroundSyncProvider::registerBackgroundSync,
-          base::Unretained(sync_provider_), options,
-          service_worker_registration, requested_from_service_worker,
-          new CallbackThreadAdapter<blink::WebSyncRegistrationCallbacks>(
-              make_scoped_ptr(callbacks), WorkerThread::GetCurrentId())));
-}
-
-void BackgroundSyncProviderThreadProxy::unregisterBackgroundSync(
-    blink::WebSyncRegistration::Periodicity periodicity,
-    int64_t id,
-    const blink::WebString& tag,
-    blink::WebServiceWorkerRegistration* service_worker_registration,
-    blink::WebSyncUnregistrationCallbacks* callbacks) {
-  DCHECK(service_worker_registration);
-  DCHECK(callbacks);
-  main_thread_task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(
-          &BackgroundSyncProvider::unregisterBackgroundSync,
-          base::Unretained(sync_provider_), periodicity, id,
-          // We cast WebString to string16 before crossing threads
-          // for thread-safety.
-          static_cast<base::string16>(tag), service_worker_registration,
-          new CallbackThreadAdapter<blink::WebSyncUnregistrationCallbacks>(
-              make_scoped_ptr(callbacks), WorkerThread::GetCurrentId())));
-}
-
-void BackgroundSyncProviderThreadProxy::getRegistration(
-    blink::WebSyncRegistration::Periodicity periodicity,
-    const blink::WebString& tag,
-    blink::WebServiceWorkerRegistration* service_worker_registration,
-    blink::WebSyncRegistrationCallbacks* callbacks) {
-  DCHECK(service_worker_registration);
-  DCHECK(callbacks);
-  main_thread_task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(
-          &BackgroundSyncProvider::getRegistration,
-          base::Unretained(sync_provider_), periodicity,
-          // We cast WebString to string16 before crossing threads
-          // for thread-safety.
-          static_cast<base::string16>(tag), service_worker_registration,
-          new CallbackThreadAdapter<blink::WebSyncRegistrationCallbacks>(
-              make_scoped_ptr(callbacks), WorkerThread::GetCurrentId())));
-}
-
-void BackgroundSyncProviderThreadProxy::getRegistrations(
-    blink::WebSyncRegistration::Periodicity periodicity,
-    blink::WebServiceWorkerRegistration* service_worker_registration,
-    blink::WebSyncGetRegistrationsCallbacks* callbacks) {
-  DCHECK(service_worker_registration);
-  DCHECK(callbacks);
-  main_thread_task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(
-          &BackgroundSyncProvider::getRegistrations,
-          base::Unretained(sync_provider_), periodicity,
-          service_worker_registration,
-          new CallbackThreadAdapter<blink::WebSyncGetRegistrationsCallbacks>(
-              make_scoped_ptr(callbacks), WorkerThread::GetCurrentId())));
-}
-
-void BackgroundSyncProviderThreadProxy::getPermissionStatus(
-    blink::WebSyncRegistration::Periodicity periodicity,
-    blink::WebServiceWorkerRegistration* service_worker_registration,
-    blink::WebSyncGetPermissionStatusCallbacks* callbacks) {
-  DCHECK(service_worker_registration);
-  DCHECK(callbacks);
-  main_thread_task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(
-          &BackgroundSyncProvider::getPermissionStatus,
-          base::Unretained(sync_provider_), periodicity,
-          service_worker_registration,
-          new CallbackThreadAdapter<blink::WebSyncGetPermissionStatusCallbacks>(
-              make_scoped_ptr(callbacks), WorkerThread::GetCurrentId())));
-}
-
-void BackgroundSyncProviderThreadProxy::releaseRegistration(int64_t handle_id) {
-  main_thread_task_runner_->PostTask(
-      FROM_HERE, base::Bind(&BackgroundSyncProvider::releaseRegistration,
-                            base::Unretained(sync_provider_), handle_id));
-}
-
-void BackgroundSyncProviderThreadProxy::notifyWhenDone(
-    int64_t handle_id,
-    blink::WebSyncNotifyWhenDoneCallbacks* callbacks) {
-  DCHECK(callbacks);
-
-  main_thread_task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(
-          &BackgroundSyncProvider::notifyWhenDone,
-          base::Unretained(sync_provider_), handle_id,
-          new CallbackThreadAdapter<blink::WebSyncNotifyWhenDoneCallbacks>(
-              make_scoped_ptr(callbacks), WorkerThread::GetCurrentId())));
-}
-
-void BackgroundSyncProviderThreadProxy::DuplicateRegistrationHandle(
-    int64 handle_id,
-    const DuplicateRegistrationHandleCallback& callback) {
-  main_thread_task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(&BackgroundSyncProvider::DuplicateRegistrationHandle,
-                 base::Unretained(sync_provider_), handle_id,
-                 base::Bind(&DuplicateRegistrationHandleCallbackOnMainThread,
-                            WorkerThread::GetCurrentId(), callback)));
-}
-
-void BackgroundSyncProviderThreadProxy::WillStopCurrentWorkerThread() {
-  delete this;
-}
-
-BackgroundSyncProviderThreadProxy::BackgroundSyncProviderThreadProxy(
-    base::SingleThreadTaskRunner* main_thread_task_runner,
-    BackgroundSyncProvider* sync_provider)
-    : main_thread_task_runner_(main_thread_task_runner),
-      sync_provider_(sync_provider) {
-  g_sync_provider_tls.Pointer()->Set(this);
-}
-
-BackgroundSyncProviderThreadProxy::~BackgroundSyncProviderThreadProxy() {
-  g_sync_provider_tls.Pointer()->Set(nullptr);
-}
-
-}  // namespace content