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/*
* Copyright (C) 2008 The Android Open Source Project
*
* 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.
*/
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
/**
* This is not instantiated - we just provide data for other classes to use
*/
public class Policy {
/**
* This location (in the build system) of the preloaded-classes file.
*/
private static final String PRELOADED_CLASS_FILE = "frameworks/base/preloaded-classes";
/**
* The internal process name of the system process. Note, this also shows up as
* "system_process", e.g. in ddms.
*/
private static final String SYSTEM_SERVER_PROCESS_NAME = "system_server";
/**
* Names of non-application processes - these will not be checked for preloaded classes.
*
* TODO: Replace this hardcoded list with a walk up the parent chain looking for zygote.
*/
private static final Set<String> NOT_FROM_ZYGOTE = new HashSet<String>(Arrays.asList(
"zygote",
"dexopt",
"unknown",
SYSTEM_SERVER_PROCESS_NAME,
"com.android.development",
"app_process" // am & other shell commands
));
/**
* Long running services. These are restricted in their contribution to the preloader
* because their launch time is less critical.
*/
private static final Set<String> SERVICES = new HashSet<String>(Arrays.asList(
SYSTEM_SERVER_PROCESS_NAME,
"com.android.acore",
// Commented out to make sure DefaultTimeZones gets preloaded.
// "com.android.phone",
"com.google.process.content",
"android.process.media"
));
/**
* Classes which we shouldn't load from the Zygote.
*/
private static final Set<String> EXCLUDED_CLASSES = new HashSet<String>(Arrays.asList(
// Binders
"android.app.AlarmManager",
"android.app.SearchManager",
"android.os.FileObserver",
"com.android.server.PackageManagerService$AppDirObserver",
// Threads
"android.os.AsyncTask",
"android.pim.ContactsAsyncHelper",
"java.lang.ProcessManager"
));
/**
* No constructor - use static methods only
*/
private Policy() {}
/**
* Returns the path/file name of the preloaded classes file that will be written
* by WritePreloadedClassFile.
*/
public static String getPreloadedClassFileName() {
return PRELOADED_CLASS_FILE;
}
/**
* Reports if a given process name was created from zygote
*/
public static boolean isFromZygote(String processName) {
return !NOT_FROM_ZYGOTE.contains(processName);
}
/**
* Reports if the given process name is a "long running" process or service
*/
public static boolean isService(String processName) {
return SERVICES.contains(processName);
}
/**
* Reports if the given class should never be preloaded
*/
public static boolean isPreloadableClass(String className) {
return !EXCLUDED_CLASSES.contains(className);
}
}
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