Delayed adding BluetoothEventRouter as BluetoothAdapter observer until when the

chrome/browser/extensions/bluetooth_event_router.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 "chrome/browser/extensions/bluetooth_event_router.h"
 
 #include <map>
 
 #include "base/json/json_writer.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/api/bluetooth/bluetooth_api_utils.h"
 #include "chrome/browser/extensions/event_names.h"
 #include "chrome/browser/extensions/event_router.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/common/extensions/api/bluetooth.h"
 #include "device/bluetooth/bluetooth_adapter.h"
 #include "device/bluetooth/bluetooth_adapter_factory.h"
 #include "device/bluetooth/bluetooth_device.h"
 #include "device/bluetooth/bluetooth_socket.h"
 
 namespace extensions {
 
 ExtensionBluetoothEventRouter::ExtensionBluetoothEventRouter(Profile* profile)
     : send_discovery_events_(false),
       responsible_for_discovery_(false),
       profile_(profile),
       adapter_(device::BluetoothAdapterFactory::DefaultAdapter()),
+      observing_(false),
       next_socket_id_(1) {
   DCHECK(profile_);
-  if (adapter_.get())
-    adapter_->AddObserver(this);
+}
+
+ExtensionBluetoothEventRouter::ExtensionBluetoothEventRouter(
+    Profile* profile, device::BluetoothAdapter* adapter)
+    : send_discovery_events_(false),
+      responsible_for_discovery_(false),
+      profile_(profile),
+      adapter_(adapter),
+      observing_(false),
+      next_socket_id_(1) {
+  DCHECK(profile_);
 }
 
 ExtensionBluetoothEventRouter::~ExtensionBluetoothEventRouter() {
   if (adapter_.get())
     adapter_->RemoveObserver(this);
 
   socket_map_.clear();
 }
 
 int ExtensionBluetoothEventRouter::RegisterSocket(
@@ skipping 11 matching lines @@
 }
 
 bool ExtensionBluetoothEventRouter::ReleaseSocket(int id) {
   SocketMap::iterator socket_entry = socket_map_.find(id);
   if (socket_entry == socket_map_.end())
     return false;
   socket_map_.erase(socket_entry);
   return true;
 }
 
+bool ExtensionBluetoothEventRouter::IsBluetoothEvent(
+    const std::string& event_name) {
+  return
+      event_name == extensions::event_names::kBluetoothOnAvailabilityChanged ||
+      event_name == extensions::event_names::kBluetoothOnDiscoveringChanged ||
+      event_name == extensions::event_names::kBluetoothOnPowerChanged;
+}
+
+void ExtensionBluetoothEventRouter::OnEventListenerAdded(
+    const std::string& event_name) {
+  if (!observing_ && IsBluetoothEvent(event_name) && adapter_.get()) {
+    adapter_->AddObserver(this);
+    observing_ = true;
+  }
+}
+
 scoped_refptr<device::BluetoothSocket>
 ExtensionBluetoothEventRouter::GetSocket(int id) {
   SocketMap::iterator socket_entry = socket_map_.find(id);
   if (socket_entry == socket_map_.end())
     return NULL;
   return socket_entry->second;
 }
 
 void ExtensionBluetoothEventRouter::SetResponsibleForDiscovery(
     bool responsible) {
@@ skipping 91 matching lines @@
 
 void ExtensionBluetoothEventRouter::DispatchBooleanValueEvent(
     const char* event_name, bool value) {
   scoped_ptr<ListValue> args(new ListValue());
   args->Append(Value::CreateBooleanValue(value));
   extensions::ExtensionSystem::Get(profile_)->event_router()->
       DispatchEventToRenderers(event_name, args.Pass(), NULL, GURL());
 }
 
 }  // namespace extensions