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/*
* Copyright (C) 2020 The Dagger Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package dagger.hilt.android.internal.managers;
import androidx.lifecycle.ViewModel;
import androidx.lifecycle.ViewModelProvider;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.activity.ComponentActivity;
import dagger.Binds;
import dagger.Module;
import dagger.hilt.EntryPoint;
import dagger.hilt.EntryPoints;
import dagger.hilt.InstallIn;
import dagger.hilt.android.ActivityRetainedLifecycle;
import dagger.hilt.android.components.ActivityRetainedComponent;
import dagger.hilt.android.internal.ThreadUtil;
import dagger.hilt.android.internal.builders.ActivityRetainedComponentBuilder;
import dagger.hilt.android.scopes.ActivityRetainedScoped;
import dagger.hilt.components.SingletonComponent;
import dagger.hilt.internal.GeneratedComponentManager;
import java.util.HashSet;
import java.util.Set;
import javax.inject.Inject;
/** A manager for the creation of components that survives activity configuration changes. */
final class ActivityRetainedComponentManager
implements GeneratedComponentManager<ActivityRetainedComponent> {
/** Entry point for {@link ActivityRetainedComponentBuilder}. */
@EntryPoint
@InstallIn(SingletonComponent.class)
public interface ActivityRetainedComponentBuilderEntryPoint {
ActivityRetainedComponentBuilder retainedComponentBuilder();
}
/** Entry point for {@link Lifecycle}. */
@EntryPoint
@InstallIn(ActivityRetainedComponent.class)
public interface ActivityRetainedLifecycleEntryPoint {
ActivityRetainedLifecycle getActivityRetainedLifecycle();
}
static final class ActivityRetainedComponentViewModel extends ViewModel {
private final ActivityRetainedComponent component;
ActivityRetainedComponentViewModel(ActivityRetainedComponent component) {
this.component = component;
}
ActivityRetainedComponent getComponent() {
return component;
}
@Override
protected void onCleared() {
super.onCleared();
ActivityRetainedLifecycle lifecycle =
EntryPoints.get(component, ActivityRetainedLifecycleEntryPoint.class)
.getActivityRetainedLifecycle();
((ActivityRetainedComponentManager.Lifecycle) lifecycle).dispatchOnCleared();
}
}
private final ViewModelProvider viewModelProvider;
@Nullable private volatile ActivityRetainedComponent component;
private final Object componentLock = new Object();
ActivityRetainedComponentManager(ComponentActivity activity) {
this.viewModelProvider =
new ViewModelProvider(
activity,
new ViewModelProvider.Factory() {
@NonNull
@Override
@SuppressWarnings("unchecked")
public <T extends ViewModel> T create(@NonNull Class<T> aClass) {
ActivityRetainedComponent component =
EntryPoints.get(
activity.getApplication(),
ActivityRetainedComponentBuilderEntryPoint.class)
.retainedComponentBuilder()
.build();
return (T) new ActivityRetainedComponentViewModel(component);
}
});
}
@Override
public ActivityRetainedComponent generatedComponent() {
if (component == null) {
synchronized (componentLock) {
if (component == null) {
component = createComponent();
}
}
}
return component;
}
private ActivityRetainedComponent createComponent() {
return viewModelProvider.get(ActivityRetainedComponentViewModel.class).getComponent();
}
/** The default implementation of {@link ActivityRetainedLifecycle}. */
@ActivityRetainedScoped
static final class Lifecycle implements ActivityRetainedLifecycle {
private final Set<OnClearedListener> listeners = new HashSet<>();
private boolean onClearedDispatched = false;
@Inject
Lifecycle() {}
@Override
public void addOnClearedListener(@NonNull OnClearedListener listener) {
ThreadUtil.ensureMainThread();
throwIfOnClearedDispatched();
listeners.add(listener);
}
@Override
public void removeOnClearedListener(@NonNull OnClearedListener listener) {
ThreadUtil.ensureMainThread();
throwIfOnClearedDispatched();
listeners.remove(listener);
}
void dispatchOnCleared() {
ThreadUtil.ensureMainThread();
onClearedDispatched = true;
for (OnClearedListener listener : listeners) {
listener.onCleared();
}
}
private void throwIfOnClearedDispatched() {
if (onClearedDispatched) {
throw new IllegalStateException(
"There was a race between the call to add/remove an OnClearedListener and onCleared(). "
+ "This can happen when posting to the Main thread from a background thread, "
+ "which is not supported.");
}
}
}
@Module
@InstallIn(ActivityRetainedComponent.class)
abstract static class LifecycleModule {
@Binds
abstract ActivityRetainedLifecycle bind(Lifecycle impl);
}
}
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