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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 {
     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
     75