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 {
  14 struct 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
  28 base::LazyInstance<ObserverListThreadSafe<
  29     base::android::ApplicationStatusListener>,
  30         LeakyLazyObserverListTraits> g_observers = LAZY_INSTANCE_INITIALIZER;
  31
  32 } // namespace
  33
  34 namespace base {
  35 namespace android {
  36
  37 ApplicationStatusListener::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
  47 ApplicationStatusListener::~ApplicationStatusListener() {
  48   g_observers.Get().RemoveObserver(this);
  49 }
  50
  51 void ApplicationStatusListener::Notify(ApplicationState state) {
  52   callback_.Run(state);
  53 }
  54
  55 // static
  56 bool ApplicationStatusListener::RegisterBindings(JNIEnv* env) {
  57   return RegisterNativesImpl(env);
  58 }
  59
  60 // static
  61 void ApplicationStatusListener::NotifyApplicationStateChange(
  62     ApplicationState state) {
  63   g_observers.Get().Notify(&ApplicationStatusListener::Notify, state);
  64 }
  65
  66 static 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