| /* |
| * Copyright (C) 2013 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 static android.os.IServiceManager.DUMP_FLAG_PRIORITY_DEFAULT; |
| |
| import android.annotation.NonNull; |
| import android.annotation.UserIdInt; |
| import android.app.ActivityThread; |
| import android.content.Context; |
| import android.content.pm.UserInfo; |
| import android.os.IBinder; |
| import android.os.ServiceManager; |
| import android.os.UserManager; |
| |
| import com.android.server.pm.UserManagerService; |
| |
| import java.io.PrintWriter; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * The base class for services running in the system process. Override and implement |
| * the lifecycle event callback methods as needed. |
| * <p> |
| * The lifecycle of a SystemService: |
| * </p><ul> |
| * <li>The constructor is called and provided with the system {@link Context} |
| * to initialize the system service. |
| * <li>{@link #onStart()} is called to get the service running. The service should |
| * publish its binder interface at this point using |
| * {@link #publishBinderService(String, IBinder)}. It may also publish additional |
| * local interfaces that other services within the system server may use to access |
| * privileged internal functions. |
| * <li>Then {@link #onBootPhase(int)} is called as many times as there are boot phases |
| * until {@link #PHASE_BOOT_COMPLETED} is sent, which is the last boot phase. Each phase |
| * is an opportunity to do special work, like acquiring optional service dependencies, |
| * waiting to see if SafeMode is enabled, or registering with a service that gets |
| * started after this one. |
| * </ul><p> |
| * NOTE: All lifecycle methods are called from the system server's main looper thread. |
| * </p> |
| * |
| * {@hide} |
| */ |
| public abstract class SystemService { |
| |
| // TODO(b/133242016) STOPSHIP: change to false before R ships |
| protected static final boolean DEBUG_USER = true; |
| |
| /* |
| * Boot Phases |
| */ |
| public static final int PHASE_WAIT_FOR_DEFAULT_DISPLAY = 100; // maybe should be a dependency? |
| |
| /** |
| * After receiving this boot phase, services can obtain lock settings data. |
| */ |
| public static final int PHASE_LOCK_SETTINGS_READY = 480; |
| |
| /** |
| * After receiving this boot phase, services can safely call into core system services |
| * such as the PowerManager or PackageManager. |
| */ |
| public static final int PHASE_SYSTEM_SERVICES_READY = 500; |
| |
| /** |
| * After receiving this boot phase, services can safely call into device specific services. |
| */ |
| public static final int PHASE_DEVICE_SPECIFIC_SERVICES_READY = 520; |
| |
| /** |
| * After receiving this boot phase, services can broadcast Intents. |
| */ |
| public static final int PHASE_ACTIVITY_MANAGER_READY = 550; |
| |
| /** |
| * After receiving this boot phase, services can start/bind to third party apps. |
| * Apps will be able to make Binder calls into services at this point. |
| */ |
| public static final int PHASE_THIRD_PARTY_APPS_CAN_START = 600; |
| |
| /** |
| * After receiving this boot phase, services can allow user interaction with the device. |
| * This phase occurs when boot has completed and the home application has started. |
| * System services may prefer to listen to this phase rather than registering a |
| * broadcast receiver for ACTION_BOOT_COMPLETED to reduce overall latency. |
| */ |
| public static final int PHASE_BOOT_COMPLETED = 1000; |
| |
| private final Context mContext; |
| |
| /** |
| * Initializes the system service. |
| * <p> |
| * Subclasses must define a single argument constructor that accepts the context |
| * and passes it to super. |
| * </p> |
| * |
| * @param context The system server context. |
| */ |
| public SystemService(Context context) { |
| mContext = context; |
| } |
| |
| /** |
| * Gets the system context. |
| */ |
| public final Context getContext() { |
| return mContext; |
| } |
| |
| /** |
| * Get the system UI context. This context is to be used for displaying UI. It is themable, |
| * which means resources can be overridden at runtime. Do not use to retrieve properties that |
| * configure the behavior of the device that is not UX related. |
| */ |
| public final Context getUiContext() { |
| // This has already been set up by the time any SystemServices are created. |
| return ActivityThread.currentActivityThread().getSystemUiContext(); |
| } |
| |
| /** |
| * Returns true if the system is running in safe mode. |
| * TODO: we should define in which phase this becomes valid |
| */ |
| public final boolean isSafeMode() { |
| return getManager().isSafeMode(); |
| } |
| |
| /** |
| * Called when the dependencies listed in the @Service class-annotation are available |
| * and after the chosen start phase. |
| * When this method returns, the service should be published. |
| */ |
| public abstract void onStart(); |
| |
| /** |
| * Called on each phase of the boot process. Phases before the service's start phase |
| * (as defined in the @Service annotation) are never received. |
| * |
| * @param phase The current boot phase. |
| */ |
| public void onBootPhase(int phase) {} |
| |
| /** |
| * Checks if the service should be available for the given user. |
| * |
| * <p>By default returns {@code true}, but subclasses should extend for optimization, if they |
| * don't support some types (like headless system user). |
| */ |
| public boolean isSupported(@NonNull UserInfo userInfo) { |
| return true; |
| } |
| |
| /** |
| * Helper method used to dump which users are {@link #onStartUser(UserInfo) supported}. |
| */ |
| protected void dumpSupportedUsers(@NonNull PrintWriter pw, @NonNull String prefix) { |
| final List<UserInfo> allUsers = UserManager.get(mContext).getUsers(); |
| final List<Integer> supportedUsers = new ArrayList<>(allUsers.size()); |
| for (UserInfo user : allUsers) { |
| supportedUsers.add(user.id); |
| } |
| if (allUsers.isEmpty()) { |
| pw.print(prefix); pw.println("No supported users"); |
| } else { |
| final int size = supportedUsers.size(); |
| pw.print(prefix); pw.print(size); pw.print(" supported user"); |
| if (size > 1) pw.print("s"); |
| pw.print(": "); pw.println(supportedUsers); |
| } |
| } |
| |
| /** |
| * @deprecated subclasses should extend {@link #onStartUser(UserInfo)} instead (which by default |
| * calls this method). |
| */ |
| @Deprecated |
| public void onStartUser(@UserIdInt int userId) {} |
| |
| /** |
| * Called when a new user is starting, for system services to initialize any per-user |
| * state they maintain for running users. |
| * |
| * <p>This method is only called when the service {@link #isSupported(UserInfo) supports} this |
| * user. |
| * |
| * @param userInfo The information about the user. <b>NOTE: </b> this is a "live" object |
| * referenced by {@link UserManagerService} and hence should not be modified. |
| */ |
| public void onStartUser(@NonNull UserInfo userInfo) { |
| onStartUser(userInfo.id); |
| } |
| |
| /** |
| * @deprecated subclasses should extend {@link #onUnlockUser(UserInfo)} instead (which by |
| * default calls this method). |
| */ |
| @Deprecated |
| public void onUnlockUser(@UserIdInt int userId) {} |
| |
| /** |
| * Called when an existing user is in the process of being unlocked. This |
| * means the credential-encrypted storage for that user is now available, |
| * and encryption-aware component filtering is no longer in effect. |
| * <p> |
| * While dispatching this event to services, the user is in the |
| * {@code STATE_RUNNING_UNLOCKING} state, and once dispatching is finished |
| * the user will transition into the {@code STATE_RUNNING_UNLOCKED} state. |
| * Code written inside system services should use |
| * {@link UserManager#isUserUnlockingOrUnlocked(int)} to handle both of |
| * these states. |
| * <p> |
| * This method is only called when the service {@link #isSupported(UserInfo) supports} this |
| * user. |
| * |
| * @param userInfo The information about the user. <b>NOTE: </b> this is a "live" object |
| * referenced by {@link UserManagerService} and hence should not be modified. |
| */ |
| public void onUnlockUser(@NonNull UserInfo userInfo) { |
| onUnlockUser(userInfo.id); |
| } |
| |
| /** |
| * @deprecated subclasses should extend {@link #onSwitchUser(UserInfo, UserInfo)} instead |
| * (which by default calls this method). |
| */ |
| @Deprecated |
| public void onSwitchUser(@UserIdInt int userId) {} |
| |
| /** |
| * Called when switching to a different foreground user, for system services that have |
| * special behavior for whichever user is currently in the foreground. This is called |
| * before any application processes are aware of the new user. |
| * |
| * <p>This method is only called when the service {@link #isSupported(UserInfo) supports} either |
| * of the users ({@code from} or {@code to}). |
| * |
| * <b>NOTE: </b> both {@code from} and {@code to} are "live" objects |
| * referenced by {@link UserManagerService} and hence should not be modified. |
| * |
| * @param from The information about the user being switched from. |
| * @param to The information about the user being switched from to. |
| */ |
| public void onSwitchUser(@NonNull UserInfo from, @NonNull UserInfo to) { |
| onSwitchUser(to.id); |
| } |
| |
| /** |
| * @deprecated subclasses should extend {@link #onStopUser(UserInfo)} instead (which by default |
| * calls this method). |
| */ |
| @Deprecated |
| public void onStopUser(@UserIdInt int userId) {} |
| |
| /** |
| * Called when an existing user is stopping, for system services to finalize any per-user |
| * state they maintain for running users. This is called prior to sending the SHUTDOWN |
| * broadcast to the user; it is a good place to stop making use of any resources of that |
| * user (such as binding to a service running in the user). |
| * |
| * <p>This method is only called when the service {@link #isSupported(UserInfo) supports} this |
| * user. |
| * |
| * <p>NOTE: This is the last callback where the callee may access the target user's CE storage. |
| * |
| * @param userInfo The information about the user. <b>NOTE: </b> this is a "live" object |
| * referenced by {@link UserManagerService} and hence should not be modified. |
| */ |
| public void onStopUser(@NonNull UserInfo userInfo) { |
| onStopUser(userInfo.id); |
| } |
| |
| /** |
| * @deprecated subclasses should extend {@link #onCleanupUser(UserInfo)} instead (which by |
| * default calls this method). |
| */ |
| @Deprecated |
| public void onCleanupUser(@UserIdInt int userId) {} |
| |
| /** |
| * Called when an existing user is stopping, for system services to finalize any per-user |
| * state they maintain for running users. This is called after all application process |
| * teardown of the user is complete. |
| * |
| * <p>This method is only called when the service {@link #isSupported(UserInfo) supports} this |
| * user. |
| * |
| * <p>NOTE: When this callback is called, the CE storage for the target user may not be |
| * accessible already. Use {@link #onStopUser(UserInfo)} instead if you need to access the CE |
| * storage. |
| * |
| * @param userInfo The information about the user. <b>NOTE: </b> this is a "live" object |
| * referenced by {@link UserManagerService} and hence should not be modified. |
| */ |
| public void onCleanupUser(@NonNull UserInfo userInfo) { |
| onCleanupUser(userInfo.id); |
| } |
| |
| /** |
| * Publish the service so it is accessible to other services and apps. |
| * |
| * @param name the name of the new service |
| * @param service the service object |
| */ |
| protected final void publishBinderService(String name, IBinder service) { |
| publishBinderService(name, service, false); |
| } |
| |
| /** |
| * Publish the service so it is accessible to other services and apps. |
| * |
| * @param name the name of the new service |
| * @param service the service object |
| * @param allowIsolated set to true to allow isolated sandboxed processes |
| * to access this service |
| */ |
| protected final void publishBinderService(String name, IBinder service, |
| boolean allowIsolated) { |
| publishBinderService(name, service, allowIsolated, DUMP_FLAG_PRIORITY_DEFAULT); |
| } |
| |
| /** |
| * Publish the service so it is accessible to other services and apps. |
| * |
| * @param name the name of the new service |
| * @param service the service object |
| * @param allowIsolated set to true to allow isolated sandboxed processes |
| * to access this service |
| * @param dumpPriority supported dump priority levels as a bitmask |
| */ |
| protected final void publishBinderService(String name, IBinder service, |
| boolean allowIsolated, int dumpPriority) { |
| ServiceManager.addService(name, service, allowIsolated, dumpPriority); |
| } |
| |
| /** |
| * Get a binder service by its name. |
| */ |
| protected final IBinder getBinderService(String name) { |
| return ServiceManager.getService(name); |
| } |
| |
| /** |
| * Publish the service so it is only accessible to the system process. |
| */ |
| protected final <T> void publishLocalService(Class<T> type, T service) { |
| LocalServices.addService(type, service); |
| } |
| |
| /** |
| * Get a local service by interface. |
| */ |
| protected final <T> T getLocalService(Class<T> type) { |
| return LocalServices.getService(type); |
| } |
| |
| private SystemServiceManager getManager() { |
| return LocalServices.getService(SystemServiceManager.class); |
| } |
| } |