base/android/application_status_listener.cc

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