1 /* 2 * Copyright (C) 2019 The Dagger Authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package dagger.hilt.android.internal.managers; 18 19 import dagger.hilt.internal.GeneratedComponentManager; 20 21 /** 22 * Do not use except in Hilt generated code! 23 * 24 * <p>A manager for the creation of components that live in the Application. 25 */ 26 public final class ApplicationComponentManager implements GeneratedComponentManager<Object> { 27 private volatile Object component; 28 private final Object componentLock = new Object(); 29 private final ComponentSupplier componentCreator; 30 ApplicationComponentManager(ComponentSupplier componentCreator)31 public ApplicationComponentManager(ComponentSupplier componentCreator) { 32 this.componentCreator = componentCreator; 33 } 34 35 @Override generatedComponent()36 public Object generatedComponent() { 37 if (component == null) { 38 synchronized (componentLock) { 39 if (component == null) { 40 component = componentCreator.get(); 41 } 42 } 43 } 44 return component; 45 } 46 } 47