chrome/browser/local_discovery/service_discovery_shared_client.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/local_discovery/service_discovery_shared_client.h"
   6
   7 #include "content/public/browser/browser_thread.h"
   8
   9 #if defined(OS_MACOSX)
  10 #include "chrome/browser/local_discovery/service_discovery_client_mac_factory.h"
  11 #endif
  12
  13 #if defined(ENABLE_MDNS)
  14 #include "chrome/browser/local_discovery/service_discovery_client_mdns.h"
  15 #endif  // ENABLE_MDNS
  16
  17 namespace local_discovery {
  18
  19 using content::BrowserThread;
  20
  21 namespace {
  22 ServiceDiscoverySharedClient* g_service_discovery_client = NULL;
  23 }  // namespace
  24
  25 ServiceDiscoverySharedClient::ServiceDiscoverySharedClient() {
  26   DCHECK(!g_service_discovery_client);
  27   g_service_discovery_client = this;
  28 }
  29
  30 ServiceDiscoverySharedClient::~ServiceDiscoverySharedClient() {
  31   DCHECK_EQ(g_service_discovery_client, this);
  32   g_service_discovery_client = NULL;
  33 }
  34
  35 #if defined(ENABLE_MDNS) || defined(OS_MACOSX)
  36
  37 scoped_refptr<ServiceDiscoverySharedClient>
  38     ServiceDiscoverySharedClient::GetInstance() {
  39   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  40
  41   if (g_service_discovery_client)
  42     return g_service_discovery_client;
  43
  44 #if defined(OS_MACOSX)
  45   return ServiceDiscoveryClientMacFactory::CreateInstance();
  46 #else
  47   return new ServiceDiscoveryClientMdns();
  48 #endif
  49 }
  50
  51 #else
  52
  53 scoped_refptr<ServiceDiscoverySharedClient>
  54     ServiceDiscoverySharedClient::GetInstance() {
  55   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  56   NOTIMPLEMENTED();
  57   return NULL;
  58 }
  59
  60 #endif  // ENABLE_MDNS
  61
  62 }  // namespace local_discovery