Revert 138216 - [Sync] Turn notifier::PushClient into an interface

jingle/notifier/listener/push_client.cc

 // Copyright (c) 2012 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 "jingle/notifier/listener/push_client.h"
 
-#include <cstddef>
-
 #include "base/bind.h"
-#include "base/single_thread_task_runner.h"
-#include "jingle/notifier/listener/non_blocking_push_client.h"
-#include "jingle/notifier/listener/xmpp_push_client.h"
+#include "base/compiler_specific.h"
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/observer_list_threadsafe.h"
+#include "jingle/notifier/base/notifier_options_util.h"
+#include "jingle/notifier/communicator/login.h"
+#include "jingle/notifier/listener/push_notifications_listen_task.h"
+#include "jingle/notifier/listener/push_notifications_send_update_task.h"
+#include "jingle/notifier/listener/push_notifications_subscribe_task.h"
+#include "talk/xmpp/xmppclientsettings.h"
 
 namespace notifier {
 
-PushClient::~PushClient() {}
-
-namespace {
-
-scoped_ptr<PushClient> CreateXmppPushClient(
-    const NotifierOptions& notifier_options) {
-  return scoped_ptr<PushClient>(new XmppPushClient(notifier_options));
-}
-
-}  // namespace
-
-scoped_ptr<PushClient> PushClient::CreateDefault(
-    const NotifierOptions& notifier_options) {
-  return scoped_ptr<PushClient>(new NonBlockingPushClient(
-      notifier_options.request_context_getter->GetIOMessageLoopProxy(),
-      base::Bind(&CreateXmppPushClient, notifier_options)));
+PushClient::Observer::~Observer() {}
+
+// All member functions except for the constructor, destructor, and
+// {Add,Remove}Observer() must be called on the IO thread (as taken from
+// |notifier_options|).
+class PushClient::Core
+    : public base::RefCountedThreadSafe<PushClient::Core>,
+      public LoginDelegate,
+      public PushNotificationsListenTaskDelegate,
+      public PushNotificationsSubscribeTaskDelegate {
+ public:
+  // Called on the parent thread.
+  explicit Core(const NotifierOptions& notifier_options);
+
+  // Must be called before being destroyed.
+  void DestroyOnIOThread();
+
+  // Login::Delegate implementation.
+  virtual void OnConnect(
+      base::WeakPtr<buzz::XmppTaskParentInterface> base_task) OVERRIDE;
+  virtual void OnDisconnect();
+
+  // PushNotificationsListenTaskDelegate implementation.
+  virtual void OnNotificationReceived(
+      const Notification& notification) OVERRIDE;
+
+  // PushNotificationsSubscribeTaskDelegate implementation.
+  virtual void OnSubscribed() OVERRIDE;
+  virtual void OnSubscriptionError() OVERRIDE;
+
+  // Called on the parent thread.
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
+  void UpdateSubscriptions(const SubscriptionList& subscriptions);
+  void UpdateCredentials(const std::string& email, const std::string& token);
+  void SendNotification(const Notification& data);
+
+  // Any notifications sent after this is called will be reflected,
+  // i.e. will be treated as an incoming notification also.
+  void ReflectSentNotificationsForTest();
+
+ private:
+  friend class base::RefCountedThreadSafe<PushClient::Core>;
+
+  // Called on either the parent thread or the I/O thread.
+  virtual ~Core();
+
+  const NotifierOptions notifier_options_;
+  const scoped_refptr<base::MessageLoopProxy> parent_message_loop_proxy_;
+  const scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
+  const scoped_refptr<ObserverListThreadSafe<Observer> > observers_;
+
+  // XMPP connection settings.
+  SubscriptionList subscriptions_;
+  buzz::XmppClientSettings xmpp_settings_;
+
+  // Must be created/used/destroyed only on the IO thread.
+  scoped_ptr<notifier::Login> login_;
+
+  // The XMPP connection.
+  base::WeakPtr<buzz::XmppTaskParentInterface> base_task_;
+
+  std::vector<Notification> pending_notifications_to_send_;
+
+  bool reflect_sent_notifications_for_test_;
+
+  DISALLOW_COPY_AND_ASSIGN(Core);
+};
+
+PushClient::Core::Core(const NotifierOptions& notifier_options)
+    : notifier_options_(notifier_options),
+      parent_message_loop_proxy_(base::MessageLoopProxy::current()),
+      io_message_loop_proxy_(
+          notifier_options_.request_context_getter->GetIOMessageLoopProxy()),
+      observers_(new ObserverListThreadSafe<Observer>()),
+      reflect_sent_notifications_for_test_(false) {}
+
+PushClient::Core::~Core() {
+  DCHECK(parent_message_loop_proxy_->BelongsToCurrentThread() ||
+         io_message_loop_proxy_->BelongsToCurrentThread());
+  DCHECK(!login_.get());
+  DCHECK(!base_task_.get());
+  observers_->AssertEmpty();
+}
+
+void PushClient::Core::DestroyOnIOThread() {
+  DCHECK(io_message_loop_proxy_->BelongsToCurrentThread());
+  login_.reset();
+  base_task_.reset();
+}
+
+void PushClient::Core::OnConnect(
+    base::WeakPtr<buzz::XmppTaskParentInterface> base_task) {
+  DCHECK(io_message_loop_proxy_->BelongsToCurrentThread());
+  base_task_ = base_task;
+
+  if (!base_task_.get()) {
+    NOTREACHED();
+    return;
+  }
+
+  // Listen for notifications.
+  {
+    // Owned by |base_task_|.
+    PushNotificationsListenTask* listener =
+        new PushNotificationsListenTask(base_task_, this);
+    listener->Start();
+  }
+
+  // Send subscriptions.
+  {
+    // Owned by |base_task_|.
+    PushNotificationsSubscribeTask* subscribe_task =
+        new PushNotificationsSubscribeTask(base_task_, subscriptions_, this);
+    subscribe_task->Start();
+  }
+
+  std::vector<Notification> notifications_to_send;
+  notifications_to_send.swap(pending_notifications_to_send_);
+  for (std::vector<Notification>::const_iterator it =
+           notifications_to_send.begin();
+       it != notifications_to_send.end(); ++it) {
+    DVLOG(1) << "Push: Sending pending notification " << it->ToString();
+    SendNotification(*it);
+  }
+}
+
+void PushClient::Core::OnDisconnect() {
+  DCHECK(io_message_loop_proxy_->BelongsToCurrentThread());
+  base_task_.reset();
+  observers_->Notify(&Observer::OnNotificationStateChange, false);
+}
+
+void PushClient::Core::OnNotificationReceived(
+    const Notification& notification) {
+  DCHECK(io_message_loop_proxy_->BelongsToCurrentThread());
+  observers_->Notify(&Observer::OnIncomingNotification, notification);
+}
+
+void PushClient::Core::OnSubscribed() {
+  DCHECK(io_message_loop_proxy_->BelongsToCurrentThread());
+  observers_->Notify(&Observer::OnNotificationStateChange, true);
+}
+
+void PushClient::Core::OnSubscriptionError() {
+  DCHECK(io_message_loop_proxy_->BelongsToCurrentThread());
+  observers_->Notify(&Observer::OnNotificationStateChange, false);
+}
+
+void PushClient::Core::AddObserver(Observer* observer) {
+  DCHECK(parent_message_loop_proxy_->BelongsToCurrentThread());
+  observers_->AddObserver(observer);
+}
+
+void PushClient::Core::RemoveObserver(Observer* observer) {
+  DCHECK(parent_message_loop_proxy_->BelongsToCurrentThread());
+  observers_->RemoveObserver(observer);
+}
+
+void PushClient::Core::UpdateSubscriptions(
+    const SubscriptionList& subscriptions) {
+  DCHECK(io_message_loop_proxy_->BelongsToCurrentThread());
+  subscriptions_ = subscriptions;
+}
+
+void PushClient::Core::UpdateCredentials(
+      const std::string& email, const std::string& token) {
+  DCHECK(io_message_loop_proxy_->BelongsToCurrentThread());
+  DVLOG(1) << "Push: Updating credentials for " << email;
+  xmpp_settings_ = MakeXmppClientSettings(notifier_options_, email, token);
+  if (login_.get()) {
+    login_->UpdateXmppSettings(xmpp_settings_);
+  } else {
+    DVLOG(1) << "Push: Starting XMPP connection";
+    base_task_.reset();
+    login_.reset(new notifier::Login(this,
+                                     xmpp_settings_,
+                                     notifier_options_.request_context_getter,
+                                     GetServerList(notifier_options_),
+                                     notifier_options_.try_ssltcp_first,
+                                     notifier_options_.auth_mechanism));
+    login_->StartConnection();
+  }
+}
+
+void PushClient::Core::SendNotification(const Notification& notification) {
+  DCHECK(io_message_loop_proxy_->BelongsToCurrentThread());
+  if (!base_task_.get()) {
+    DVLOG(1) << "Push: Cannot send notification "
+             << notification.ToString() << "; sending later";
+    pending_notifications_to_send_.push_back(notification);
+    return;
+  }
+  // Owned by |base_task_|.
+  PushNotificationsSendUpdateTask* task =
+      new PushNotificationsSendUpdateTask(base_task_, notification);
+  task->Start();
+
+  if (reflect_sent_notifications_for_test_) {
+    OnNotificationReceived(notification);
+  }
+}
+
+void PushClient::Core::ReflectSentNotificationsForTest() {
+  DCHECK(io_message_loop_proxy_->BelongsToCurrentThread());
+  reflect_sent_notifications_for_test_ = true;
+}
+
+PushClient::PushClient(const NotifierOptions& notifier_options)
+    : core_(new Core(notifier_options)),
+      parent_message_loop_proxy_(base::MessageLoopProxy::current()),
+      io_message_loop_proxy_(
+          notifier_options.request_context_getter->GetIOMessageLoopProxy()) {
+}
+
+PushClient::~PushClient() {
+  DCHECK(parent_message_loop_proxy_->BelongsToCurrentThread());
+  io_message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&PushClient::Core::DestroyOnIOThread, core_.get()));
+}
+
+void PushClient::AddObserver(Observer* observer) {
+  DCHECK(parent_message_loop_proxy_->BelongsToCurrentThread());
+  core_->AddObserver(observer);
+}
+
+void PushClient::RemoveObserver(Observer* observer) {
+  DCHECK(parent_message_loop_proxy_->BelongsToCurrentThread());
+  core_->RemoveObserver(observer);
+}
+
+void PushClient::UpdateSubscriptions(const SubscriptionList& subscriptions) {
+  DCHECK(parent_message_loop_proxy_->BelongsToCurrentThread());
+  io_message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&PushClient::Core::UpdateSubscriptions,
+                 core_.get(), subscriptions));
+}
+
+void PushClient::UpdateCredentials(
+    const std::string& email, const std::string& token) {
+  DCHECK(parent_message_loop_proxy_->BelongsToCurrentThread());
+  io_message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&PushClient::Core::UpdateCredentials,
+                 core_.get(), email, token));
+}
+
+void PushClient::SendNotification(const Notification& notification) {
+  DCHECK(parent_message_loop_proxy_->BelongsToCurrentThread());
+  io_message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&PushClient::Core::SendNotification, core_.get(),
+                 notification));
+}
+
+void PushClient::SimulateOnNotificationReceivedForTest(
+    const Notification& notification) {
+  DCHECK(parent_message_loop_proxy_->BelongsToCurrentThread());
+  io_message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&PushClient::Core::OnNotificationReceived,
+                 core_.get(), notification));
+}
+
+void PushClient::SimulateConnectAndSubscribeForTest(
+    base::WeakPtr<buzz::XmppTaskParentInterface> base_task) {
+  DCHECK(parent_message_loop_proxy_->BelongsToCurrentThread());
+  io_message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&PushClient::Core::OnConnect, core_.get(), base_task));
+  io_message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&PushClient::Core::OnSubscribed, core_.get()));
+}
+
+void PushClient::SimulateDisconnectForTest() {
+  DCHECK(parent_message_loop_proxy_->BelongsToCurrentThread());
+  io_message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&PushClient::Core::OnDisconnect, core_.get()));
+}
+
+void PushClient::SimulateSubscriptionErrorForTest() {
+  io_message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&PushClient::Core::OnSubscriptionError, core_.get()));
+}
+
+void PushClient::ReflectSentNotificationsForTest() {
+  io_message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&PushClient::Core::ReflectSentNotificationsForTest,
+                 core_.get()));
 }
 
 }  // namespace notifier