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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/android/application_status_listener.h"
#include <jni.h>
#include "base/functional/callback.h"
#include "base/lazy_instance.h"
#include "base/metrics/user_metrics.h"
#include "base/observer_list_threadsafe.h"
#include "base/trace_event/base_tracing.h"
#if BUILDFLAG(ENABLE_BASE_TRACING)
#include "base/trace_event/application_state_proto_android.h" // no-presubmit-check
#endif // BUILDFLAG(ENABLE_BASE_TRACING)
// Must come after all headers that specialize FromJniType() / ToJniType().
#include "base/tasks_jni/ApplicationStatus_jni.h"
namespace base {
namespace android {
namespace {
class ApplicationStatusListenerImpl;
struct LeakyLazyObserverListTraits
: base::internal::LeakyLazyInstanceTraits<
ObserverListThreadSafe<ApplicationStatusListenerImpl>> {
static ObserverListThreadSafe<ApplicationStatusListenerImpl>* New(
void* instance) {
ObserverListThreadSafe<ApplicationStatusListenerImpl>* ret =
base::internal::LeakyLazyInstanceTraits<ObserverListThreadSafe<
ApplicationStatusListenerImpl>>::New(instance);
// Leaky.
ret->AddRef();
return ret;
}
};
LazyInstance<ObserverListThreadSafe<ApplicationStatusListenerImpl>,
LeakyLazyObserverListTraits>
g_observers = LAZY_INSTANCE_INITIALIZER;
class ApplicationStatusListenerImpl : public ApplicationStatusListener {
public:
ApplicationStatusListenerImpl(
const ApplicationStateChangeCallback& callback) {
SetCallback(callback);
g_observers.Get().AddObserver(this);
Java_ApplicationStatus_registerThreadSafeNativeApplicationStateListener(
AttachCurrentThread());
}
~ApplicationStatusListenerImpl() override {
g_observers.Get().RemoveObserver(this);
}
void SetCallback(const ApplicationStateChangeCallback& callback) override {
DCHECK(!callback_);
DCHECK(callback);
callback_ = callback;
}
void Notify(ApplicationState state) override {
if (callback_) {
callback_.Run(state);
}
}
private:
ApplicationStateChangeCallback callback_;
};
} // namespace
ApplicationStatusListener::ApplicationStatusListener() = default;
ApplicationStatusListener::~ApplicationStatusListener() = default;
// static
std::unique_ptr<ApplicationStatusListener> ApplicationStatusListener::New(
const ApplicationStateChangeCallback& callback) {
return std::make_unique<ApplicationStatusListenerImpl>(callback);
}
// static
void ApplicationStatusListener::NotifyApplicationStateChange(
ApplicationState state) {
TRACE_APPLICATION_STATE(state);
switch (state) {
case APPLICATION_STATE_UNKNOWN:
case APPLICATION_STATE_HAS_DESTROYED_ACTIVITIES:
break;
case APPLICATION_STATE_HAS_RUNNING_ACTIVITIES:
RecordAction(UserMetricsAction("Android.LifeCycle.HasRunningActivities"));
break;
case APPLICATION_STATE_HAS_PAUSED_ACTIVITIES:
RecordAction(UserMetricsAction("Android.LifeCycle.HasPausedActivities"));
break;
case APPLICATION_STATE_HAS_STOPPED_ACTIVITIES:
RecordAction(UserMetricsAction("Android.LifeCycle.HasStoppedActivities"));
break;
}
g_observers.Get().Notify(FROM_HERE, &ApplicationStatusListenerImpl::Notify,
state);
}
// static
ApplicationState ApplicationStatusListener::GetState() {
return static_cast<ApplicationState>(
Java_ApplicationStatus_getStateForApplication(AttachCurrentThread()));
}
static void JNI_ApplicationStatus_OnApplicationStateChange(JNIEnv* env,
jint new_state) {
ApplicationState application_state = static_cast<ApplicationState>(new_state);
ApplicationStatusListener::NotifyApplicationStateChange(application_state);
}
// static
bool ApplicationStatusListener::HasVisibleActivities() {
return Java_ApplicationStatus_hasVisibleActivities(AttachCurrentThread());
}
} // namespace android
} // namespace base
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