base/android/activity_status.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 "base/android/activity_status.h"
   6
   7 #include <jni.h>
   8
   9 #include "base/memory/singleton.h"
  10 #include "jni/ActivityStatus_jni.h"
  11
  12 namespace base {
  13 namespace android {
  14
  15 ActivityStatus::Listener::Listener(
  16     const ActivityStatus::StateChangeCallback& callback)
  17     : callback_(callback) {
  18   ActivityStatus::GetInstance()->RegisterListener(this);
  19 }
  20
  21 ActivityStatus::Listener::~Listener() {
  22   ActivityStatus::GetInstance()->UnregisterListener(this);
  23 }
  24
  25 void ActivityStatus::Listener::Notify(ActivityState state) {
  26   callback_.Run(state);
  27 }
  28
  29 // static
  30 ActivityStatus* ActivityStatus::GetInstance() {
  31   return Singleton<ActivityStatus,
  32                    LeakySingletonTraits<ActivityStatus> >::get();
  33 }
  34
  35 static void OnActivityStateChange(JNIEnv* env, jclass clazz, int new_state) {
  36   ActivityStatus* activity_status = ActivityStatus::GetInstance();
  37   ActivityState activity_state = static_cast<ActivityState>(new_state);
  38   activity_status->OnActivityStateChange(activity_state);
  39 }
  40
  41 bool ActivityStatus::RegisterBindings(JNIEnv* env) {
  42   return RegisterNativesImpl(env);
  43 }
  44
  45 ActivityStatus::ActivityStatus()
  46     : observers_(new ObserverListThreadSafe<Listener>()) {
  47   Java_ActivityStatus_registerThreadSafeNativeStateListener(
  48       base::android::AttachCurrentThread());
  49 }
  50
  51 ActivityStatus::~ActivityStatus() {}
  52
  53 void ActivityStatus::RegisterListener(Listener* listener) {
  54   observers_->AddObserver(listener);
  55 }
  56
  57 void ActivityStatus::UnregisterListener(Listener* listener) {
  58   observers_->RemoveObserver(listener);
  59 }
  60
  61 void ActivityStatus::OnActivityStateChange(ActivityState new_state) {
  62   observers_->Notify(&ActivityStatus::Listener::Notify, new_state);
  63 }
  64
  65 }  // namespace android
  66 }  // namespace base