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      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
     69 ApplicationState ApplicationStatusListener::GetState() {
     70   return static_cast<ApplicationState>(
     71       Java_ApplicationStatus_getStateForApplication(AttachCurrentThread()));
     72 }
     73 
     74 static void OnApplicationStateChange(JNIEnv* env,
     75                                      const JavaParamRef<jclass>& clazz,
     76                                      jint new_state) {
     77   ApplicationState application_state = static_cast<ApplicationState>(new_state);
     78   ApplicationStatusListener::NotifyApplicationStateChange(application_state);
     79 }
     80 
     81 }  // namespace android
     82 }  // namespace base
     83