1 /* 2 * Copyright (C) 2024 The Android Open Source Project 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 com.android.launcher3.util; 18 19 import static com.android.launcher3.util.Executors.MAIN_EXECUTOR; 20 21 import com.android.launcher3.dagger.LauncherAppSingleton; 22 23 import java.util.ArrayList; 24 25 import javax.inject.Inject; 26 27 /** 28 * A tracker class for keeping track of Dagger created singletons. 29 * Dagger will take care of creating singletons. But we should take care of unregistering callbacks 30 * if at all registered during singleton construction. 31 * All singletons should be declared as SafeCloseable so that we can call close() method. 32 */ 33 @LauncherAppSingleton 34 public class DaggerSingletonTracker implements SafeCloseable { 35 36 private final ArrayList<SafeCloseable> mCloseables = new ArrayList<>(); 37 38 private boolean mClosed = false; 39 40 @Inject DaggerSingletonTracker()41 DaggerSingletonTracker() { 42 } 43 44 /** 45 * Adds the SafeCloseable Singletons to the mLauncherAppSingletons list. 46 * This helps to track the singletons and close them appropriately. 47 * See {@link DaggerSingletonTracker#close()} and 48 * {@link SandboxContext#onDestroy()} 49 */ addCloseable(SafeCloseable closeable)50 public void addCloseable(SafeCloseable closeable) { 51 MAIN_EXECUTOR.execute(() -> { 52 if (mClosed) { 53 closeable.close(); 54 } else { 55 mCloseables.add(closeable); 56 } 57 }); 58 } 59 60 @Override close()61 public void close() { 62 mClosed = true; 63 // Destroy in reverse order 64 for (int i = mCloseables.size() - 1; i >= 0; i--) { 65 mCloseables.get(i).close(); 66 } 67 } 68 } 69