1// Copyright 2014 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/application_status_listener.h"
6
7#include <jni.h>
8
9#include "base/lazy_instance.h"
10#include "base/observer_list_threadsafe.h"
11#include "jni/ApplicationStatus_jni.h"
12
13namespace {
14struct LeakyLazyObserverListTraits :
15    base::internal::LeakyLazyInstanceTraits<
16        ObserverListThreadSafe<base::android::ApplicationStatusListener> > {
17  static ObserverListThreadSafe<base::android::ApplicationStatusListener>*
18      New(void* instance) {
19    ObserverListThreadSafe<base::android::ApplicationStatusListener>* ret =
20        base::internal::LeakyLazyInstanceTraits<ObserverListThreadSafe<
21            base::android::ApplicationStatusListener> >::New(instance);
22    // Leaky.
23    ret->AddRef();
24    return ret;
25  }
26};
27
28base::LazyInstance<ObserverListThreadSafe<
29    base::android::ApplicationStatusListener>,
30        LeakyLazyObserverListTraits> g_observers = LAZY_INSTANCE_INITIALIZER;
31
32} // namespace
33
34namespace base {
35namespace android {
36
37ApplicationStatusListener::ApplicationStatusListener(
38    const ApplicationStatusListener::ApplicationStateChangeCallback& callback)
39    : callback_(callback) {
40  DCHECK(!callback_.is_null());
41  g_observers.Get().AddObserver(this);
42
43  Java_ApplicationStatus_registerThreadSafeNativeApplicationStateListener(
44      base::android::AttachCurrentThread());
45}
46
47ApplicationStatusListener::~ApplicationStatusListener() {
48  g_observers.Get().RemoveObserver(this);
49}
50
51void ApplicationStatusListener::Notify(ApplicationState state) {
52  callback_.Run(state);
53}
54
55// static
56bool ApplicationStatusListener::RegisterBindings(JNIEnv* env) {
57  return RegisterNativesImpl(env);
58}
59
60// static
61void ApplicationStatusListener::NotifyApplicationStateChange(
62    ApplicationState state) {
63  g_observers.Get().Notify(&ApplicationStatusListener::Notify, state);
64}
65
66static void OnApplicationStateChange(JNIEnv* env,
67                                     jclass clazz,
68                                     jint new_state) {
69  ApplicationState application_state = static_cast<ApplicationState>(new_state);
70  ApplicationStatusListener::NotifyApplicationStateChange(application_state);
71}
72
73}  // namespace android
74}  // namespace base
75