1 /* 2 * Copyright (C) 2008 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 import java.util.Arrays; 18 import java.util.HashSet; 19 import java.util.Set; 20 21 /** 22 * Policy that governs which classes are preloaded. 23 */ 24 public class Policy { 25 26 /** 27 * No constructor - use static methods only 28 */ Policy()29 private Policy() {} 30 31 /** 32 * This location (in the build system) of the preloaded-classes file. 33 */ 34 static final String PRELOADED_CLASS_FILE 35 = "frameworks/base/preloaded-classes"; 36 37 /** 38 * Long running services. These are restricted in their contribution to the 39 * preloader because their launch time is less critical. 40 */ 41 // TODO: Generate this automatically from package manager. 42 private static final Set<String> SERVICES = new HashSet<String>(Arrays.asList( 43 "system_server", 44 "com.google.process.content", 45 "android.process.media", 46 "com.android.bluetooth", 47 "com.android.calendar", 48 "com.android.inputmethod.latin", 49 "com.android.phone", 50 "com.google.android.apps.maps.FriendService", // pre froyo 51 "com.google.android.apps.maps:FriendService", // froyo 52 "com.google.android.apps.maps.LocationFriendService", 53 "com.google.android.deskclock", 54 "com.google.process.gapps", 55 "android.tts" 56 )); 57 58 /** 59 * Classes which we shouldn't load from the Zygote. 60 */ 61 private static final Set<String> EXCLUDED_CLASSES 62 = new HashSet<String>(Arrays.asList( 63 // Binders 64 "android.app.AlarmManager", 65 "android.app.SearchManager", 66 "android.os.FileObserver", 67 "com.android.server.PackageManagerService$AppDirObserver", 68 69 // Threads 70 "android.os.AsyncTask", 71 "android.pim.ContactsAsyncHelper", 72 "android.webkit.WebViewClassic$1", 73 "java.lang.ProcessManager" 74 )); 75 76 /** 77 * Returns true if the given process name is a "long running" process or 78 * service. 79 */ isService(String processName)80 public static boolean isService(String processName) { 81 return SERVICES.contains(processName); 82 } 83 84 /** Reports if the given class should be preloaded. */ isPreloadable(LoadedClass clazz)85 public static boolean isPreloadable(LoadedClass clazz) { 86 return clazz.systemClass && !EXCLUDED_CLASSES.contains(clazz.name) 87 && !clazz.name.endsWith("$NoPreloadHolder"); 88 } 89 } 90