Policy.java revision 2e93f65cab0b4b21a1285b83e985559325e87a3a 
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
17import java.util.Arrays;
18import java.util.HashSet;
19import java.util.Set;
20
21/**
22 * This is not instantiated - we just provide data for other classes to use
23 */
24public class Policy {
25
26    /**
27     * No constructor - use static methods only
28     */
29    private Policy() {}
30
31    /**
32     * This location (in the build system) of the preloaded-classes file.
33     */
34    private 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    private static final Set<String> SERVICES = new HashSet<String>(Arrays.asList(
42            "system_server",
43            "com.google.process.content",
44            "android.process.media",
45            "com.google.process.gapps"
46    ));
47
48    /**
49     * Classes which we shouldn't load from the Zygote.
50     */
51    private static final Set<String> EXCLUDED_CLASSES
52            = new HashSet<String>(Arrays.asList(
53        // Binders
54        "android.app.AlarmManager",
55        "android.app.SearchManager",
56        "android.os.FileObserver",
57        "com.android.server.PackageManagerService$AppDirObserver",
58
59        // Threads
60        "android.os.AsyncTask",
61        "android.pim.ContactsAsyncHelper",
62        "java.lang.ProcessManager"
63    ));
64
65    /**
66     * Returns the path/file name of the preloaded classes file that will be written
67     * by WritePreloadedClassFile.
68     */
69    public static String getPreloadedClassFileName() {
70        return PRELOADED_CLASS_FILE;
71    }
72
73    /**
74     * Reports if the given process name is a "long running" process or service
75     */
76    public static boolean isService(String processName) {
77        return SERVICES.contains(processName);
78    }
79
80    /**
81     * Reports if the given class should never be preloaded
82     */
83    public static boolean isPreloadableClass(String className) {
84        return !EXCLUDED_CLASSES.contains(className);
85    }
86}
87