System Server
From Jollen's Wiki
[編輯]
Android:ServerThread
- ServerThread由SystemServer啟動
- ServerThread是一個 Java thread
/*
* Copyright (C) 2006 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.
*/
package com.android.server;
import android.app.ActivityManagerNative;
import android.content.ContentResolver;
import android.content.ContentService;
import android.content.Context;
import android.content.pm.IPackageManager;
import android.database.ContentObserver;
import android.database.Cursor;
import android.media.AudioService;
import android.os.Looper;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.SystemClock;
import android.os.SystemProperties;
import android.os.IBinder;
import android.provider.Settings;
import android.provider.Contacts.People;
import android.server.BluetoothDeviceService;
import android.server.checkin.FallbackCheckinService;
import android.server.search.SearchManagerService;
import android.util.EventLog;
import android.util.Log;
import dalvik.system.VMRuntime;
import com.android.server.am.ActivityManagerService;
import com.android.server.status.StatusBarService;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
class ServerThread extends Thread {
private static final String TAG = "SystemServer";
private final static boolean INCLUDE_DEMO = false;
private static final int LOG_BOOT_PROGRESS_SYSTEM_RUN = 3010;
private ContentResolver mContentResolver;
private class AdbSettingsObserver extends ContentObserver {
public AdbSettingsObserver() {
super(null);
}
@Override
public void onChange(boolean selfChange) {
boolean enableAdb = (Settings.System.getInt(mContentResolver,
Settings.System.ADB_ENABLED, 0) > 0);
// setting this system property will start or stop adbd
SystemProperties.set("persist.service.adb.enable", enableAdb ? "1" : "0");
}
}
@Override
public void run() {
EventLog.writeEvent(LOG_BOOT_PROGRESS_SYSTEM_RUN,
SystemClock.uptimeMillis());
ActivityManagerService.prepareTraceFile(false); // create dir
Looper.prepare();
android.os.Process.setThreadPriority(
android.os.Process.THREAD_PRIORITY_FOREGROUND);
String factoryTestStr = SystemProperties.get("ro.factorytest");
int factoryTest = "".equals(factoryTestStr) ? SystemServer.FACTORY_TEST_OFF
: Integer.parseInt(factoryTestStr);
PowerManagerService power = null;
IPackageManager pm = null;
Context context = null;
WindowManagerService wm = null;
BluetoothDeviceService bluetooth = null;
HeadsetObserver headset = null;
// Critical services...
try {
Log.i(TAG, "Starting Power Manager.");
power = new PowerManagerService();
ServiceManager.addService(Context.POWER_SERVICE, power);
Log.i(TAG, "Starting Activity Manager.");
context = ActivityManagerService.main(factoryTest);
Log.i(TAG, "Starting telephony registry");
ServiceManager.addService("telephony.registry", new TelephonyRegistry(context));
AttributeCache.init(context);
Log.i(TAG, "Starting Package Manager.");
pm = PackageManagerService.main(context,
factoryTest != SystemServer.FACTORY_TEST_OFF);
ActivityManagerService.setSystemProcess();
mContentResolver = context.getContentResolver();
Log.i(TAG, "Starting Content Manager.");
ContentService.main(context,
factoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL);
Log.i(TAG, "Starting System Content Providers.");
ActivityManagerService.installSystemProviders();
Log.i(TAG, "Starting Battery Service.");
BatteryService battery = new BatteryService(context);
ServiceManager.addService("battery", battery);
// only initialize the power service after we have started the
// content providers and the batter service.
power.init(context, ActivityManagerService.getDefault(), battery);
Log.i(TAG, "Starting Alarm Manager.");
AlarmManagerService alarm = new AlarmManagerService(context);
ServiceManager.addService(Context.ALARM_SERVICE, alarm);
Watchdog.getInstance().init(context, battery, power, alarm,
ActivityManagerService.self());
// Sensor Service is needed by Window Manager, so this goes first
Log.i(TAG, "Starting Sensor Service.");
ServiceManager.addService(Context.SENSOR_SERVICE, new SensorService(context));
Log.i(TAG, "Starting Window Manager.");
wm = WindowManagerService.main(context, power);
ServiceManager.addService(Context.WINDOW_SERVICE, wm);
((ActivityManagerService)ServiceManager.getService("activity"))
.setWindowManager(wm);
// Skip Bluetooth if we have an emulator kernel
// TODO: Use a more reliable check to see if this product should
// support Bluetooth - see bug 988521
if (SystemProperties.get("ro.kernel.qemu").equals("1")) {
Log.i(TAG, "Registering null Bluetooth Service (emulator)");
ServiceManager.addService(Context.BLUETOOTH_SERVICE, null);
} else if (factoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL) {
Log.i(TAG, "Registering null Bluetooth Service (factory test)");
ServiceManager.addService(Context.BLUETOOTH_SERVICE, null);
} else {
Log.i(TAG, "Starting Bluetooth Service.");
bluetooth = new BluetoothDeviceService(context);
bluetooth.init();
ServiceManager.addService(Context.BLUETOOTH_SERVICE, bluetooth);
int bluetoothOn = Settings.System.getInt(mContentResolver,
Settings.System.BLUETOOTH_ON, 0);
if (bluetoothOn > 0) {
bluetooth.enable(null);
}
}
} catch (RuntimeException e) {
Log.e("System", "Failure starting core service", e);
}
if (factoryTest != SystemServer.FACTORY_TEST_LOW_LEVEL) {
StatusBarService statusBar = null;
try {
Log.i(TAG, "Starting Status Bar Service.");
statusBar = new StatusBarService(context);
ServiceManager.addService("statusbar", statusBar);
com.android.server.status.StatusBarPolicy.installIcons(context, statusBar);
} catch (Throwable e) {
Log.e(TAG, "Failure starting StatusBarService", e);
}
try {
Log.i(TAG, "Starting Hardware Service.");
ServiceManager.addService("hardware", new HardwareService(context));
} catch (Throwable e) {
Log.e(TAG, "Failure starting Hardware Service", e);
}
try {
Log.i(TAG, "Starting NetStat Service.");
ServiceManager.addService("netstat", new NetStatService(context));
} catch (Throwable e) {
Log.e(TAG, "Failure starting NetStat Service", e);
}
try {
Log.i(TAG, "Starting Connectivity Service.");
ServiceManager.addService(Context.CONNECTIVITY_SERVICE,
ConnectivityService.getInstance(context));
} catch (Throwable e) {
Log.e(TAG, "Failure starting Connectivity Service", e);
}
try {
Log.i(TAG, "Starting Notification Manager.");
ServiceManager.addService(Context.NOTIFICATION_SERVICE,
new NotificationManagerService(context, statusBar));
} catch (Throwable e) {
Log.e(TAG, "Failure starting Notification Manager", e);
}
try {
// MountService must start after NotificationManagerService
Log.i(TAG, "Starting Mount Service.");
ServiceManager.addService("mount", new MountService(context));
} catch (Throwable e) {
Log.e(TAG, "Failure starting Mount Service", e);
}
try {
Log.i(TAG, "Starting DeviceMemoryMonitor service");
ServiceManager.addService("devicememorymonitor", new DeviceMemoryMonitorService(context));
} catch (Throwable e) {
Log.e(TAG, "Failure starting DeviceMemoryMonitor service", e);
}
try {
Log.i(TAG, "Starting Location Manager.");
ServiceManager.addService(Context.LOCATION_SERVICE, new LocationManagerService(context));
} catch (Throwable e) {
Log.e(TAG, "Failure starting Location Manager", e);
}
try {
Log.i(TAG, "Starting Search Service.");
ServiceManager.addService( Context.SEARCH_SERVICE, new SearchManagerService(context) );
} catch (Throwable e) {
Log.e(TAG, "Failure starting Search Service", e);
}
try {
Log.i(TAG, "Starting Clipboard Service.");
ServiceManager.addService("clipboard", new ClipboardService(context));
} catch (Throwable e) {
Log.e(TAG, "Failure starting Clipboard Service", e);
}
if (INCLUDE_DEMO) {
Log.i(TAG, "Installing demo data...");
(new DemoThread(context)).start();
}
try {
Log.i(TAG, "Starting Checkin Service");
addService(context, "checkin", "com.google.android.server.checkin.CheckinService",
FallbackCheckinService.class);
} catch (Throwable e) {
Log.e(TAG, "Failure starting Checkin Service", e);
}
try {
Log.i(TAG, "Starting Wallpaper Service");
ServiceManager.addService(Context.WALLPAPER_SERVICE, new WallpaperService(context));
} catch (Throwable e) {
Log.e(TAG, "Failure starting Wallpaper Service", e);
}
try {
Log.i(TAG, "Starting Audio Service");
ServiceManager.addService(Context.AUDIO_SERVICE, new AudioService(context));
} catch (Throwable e) {
Log.e(TAG, "Failure starting Volume Service", e);
}
try {
Log.i(TAG, "Starting HeadsetObserver");
// Listen for wired headset changes
headset = new HeadsetObserver(context);
} catch (Throwable e) {
Log.e(TAG, "Failure starting HeadsetObserver", e);
}
}
// make sure the ADB_ENABLED setting value matches the system property value
Settings.System.putInt(mContentResolver, Settings.System.ADB_ENABLED,
"1".equals(SystemProperties.get("persist.service.adb.enable")) ? 1 : 0);
// register observer to listen for settings changes
mContentResolver.registerContentObserver(Settings.System.getUriFor(Settings.System.ADB_ENABLED),
false, new AdbSettingsObserver());
// It is now time to start up the app processes...
wm.systemReady();
power.systemReady();
try {
pm.systemReady();
} catch (RemoteException e) {
}
// After making the following code, third party code may be running...
try {
ActivityManagerNative.getDefault().systemReady();
} catch (RemoteException e) {
}
Watchdog.getInstance().start();
Looper.loop();
Log.d(TAG, "System ServerThread is exiting!");
}
private void addService(Context context, String name, String serviceClass,
Class<? extends IBinder> fallback) {
final IBinder service = findService(context, serviceClass, fallback);
if (service != null) {
ServiceManager.addService(name, service);
} else {
Log.e(TAG, "Failure starting service '" + name + "' with class " + serviceClass);
}
}
private IBinder findService(Context context, String serviceClass,
Class<? extends IBinder> fallback) {
IBinder service = null;
try {
Class<?> klass = Class.forName(serviceClass);
Constructor<?> c = klass.getConstructor(Context.class);
service = (IBinder) c.newInstance(context);
} catch (ClassNotFoundException e) {
// Ignore
} catch (IllegalAccessException e) {
// Ignore
} catch (NoSuchMethodException e) {
// Ignore
} catch (InvocationTargetException e) {
// Ignore
} catch (InstantiationException e) {
// Ignore
}
if (service == null && fallback != null) {
Log.w(TAG, "Could not find " + serviceClass + ", trying fallback");
try {
service = fallback.newInstance();
} catch (IllegalAccessException e) {
// Ignore
} catch (InstantiationException e) {
// Ignore
}
}
return service;
}
}
class DemoThread extends Thread
{
DemoThread(Context context)
{
mContext = context;
}
@Override
public void run()
{
try {
Cursor c = mContext.getContentResolver().query(People.CONTENT_URI, null, null, null, null);
boolean hasData = c != null && c.moveToFirst();
if (c != null) {
c.deactivate();
}
if (!hasData) {
DemoDataSet dataset = new DemoDataSet();
dataset.add(mContext);
}
} catch (Throwable e) {
Log.e("SystemServer", "Failure installing demo data", e);
}
}
Context mContext;
}
public class SystemServer
{
private static final String TAG = "SystemServer";
public static final int FACTORY_TEST_OFF = 0;
public static final int FACTORY_TEST_LOW_LEVEL = 1;
public static final int FACTORY_TEST_HIGH_LEVEL = 2;
/**
* This method is called from Zygote to initialize the system. This will cause the native
* services (SurfaceFlinger, AudioFlinger, etc..) to be started. After that it will call back
* up into init2() to start the Android services.
*/
native public static void init1(String[] args);
public static void main(String[] args) {
// The system server has to run all of the time, so it needs to be
// as efficient as possible with its memory usage.
VMRuntime.getRuntime().setTargetHeapUtilization(0.8f);
System.loadLibrary("android_servers");
init1(args);
}
public static final void init2() {
Log.i(TAG, "Entered the Android system server!");
Thread thr = new ServerThread();
thr.setName("android.server.ServerThread");
thr.start();
}
}
