diff options
Diffstat (limited to 'services/core/java/com/android/server/SystemServiceManager.java')
-rw-r--r-- | services/core/java/com/android/server/SystemServiceManager.java | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/services/core/java/com/android/server/SystemServiceManager.java b/services/core/java/com/android/server/SystemServiceManager.java new file mode 100644 index 0000000..59f7e92 --- /dev/null +++ b/services/core/java/com/android/server/SystemServiceManager.java @@ -0,0 +1,163 @@ +/* + * 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 android.content.Context; +import android.util.Log; +import android.util.Slog; + +import java.util.ArrayList; + +/** + * Manages creating, starting, and other lifecycle events of system services. + */ +public class SystemServiceManager { + private static final String TAG = "SystemServiceManager"; + + private final Context mContext; + private boolean mSafeMode; + + // Services that should receive lifecycle events. + private final ArrayList<SystemService> mServices = new ArrayList<SystemService>(); + + private int mCurrentPhase = -1; + + public SystemServiceManager(Context context) { + mContext = context; + } + + public void startService(String className) { + try { + startService(Class.forName(className)); + } catch (ClassNotFoundException cnfe) { + Slog.i(TAG, className + " not available, ignoring."); + } + } + + /** + * Creates and starts a system service. The class must be a subclass of + * {@link com.android.server.SystemService}. + * + * @param serviceClass A Java class that implements the SystemService interface. + * @throws RuntimeException if the service fails to start. + */ + public void startService(Class<?> serviceClass) { + final SystemService serviceInstance = createInstance(serviceClass); + try { + Slog.i(TAG, "Creating " + serviceClass.getSimpleName()); + serviceInstance.init(mContext, this); + } catch (Throwable e) { + throw new RuntimeException("Failed to create service " + serviceClass.getName(), e); + } + + mServices.add(serviceInstance); + + try { + Slog.i(TAG, "Starting " + serviceClass.getSimpleName()); + serviceInstance.onStart(); + } catch (Throwable e) { + throw new RuntimeException("Failed to start service " + serviceClass.getName(), e); + } + } + + /** + * Starts the specified boot phase for all system services that have been started up to + * this point. + * + * @param phase The boot phase to start. + */ + public void startBootPhase(final int phase) { + if (phase <= mCurrentPhase) { + throw new IllegalArgumentException("Next phase must be larger than previous"); + } + mCurrentPhase = phase; + + Slog.i(TAG, "Starting phase " + mCurrentPhase); + + final int serviceLen = mServices.size(); + for (int i = 0; i < serviceLen; i++) { + final SystemService service = mServices.get(i); + try { + service.onBootPhase(mCurrentPhase); + } catch (Throwable e) { + reportWtf("Service " + service.getClass().getName() + + " threw an Exception processing boot phase " + mCurrentPhase, e); + } + } + } + + /** Sets the safe mode flag for services to query. */ + public void setSafeMode(boolean safeMode) { + mSafeMode = safeMode; + } + + /** + * Returns whether we are booting into safe mode. + * @return safe mode flag + */ + public boolean isSafeMode() { + return mSafeMode; + } + + /** + * Outputs the state of this manager to the System log. + */ + public void dump() { + StringBuilder builder = new StringBuilder(); + builder.append("Current phase: ").append(mCurrentPhase).append("\n"); + builder.append("Services:\n"); + final int startedLen = mServices.size(); + for (int i = 0; i < startedLen; i++) { + final SystemService service = mServices.get(i); + builder.append("\t") + .append(service.getClass().getSimpleName()) + .append("\n"); + } + + Slog.e(TAG, builder.toString()); + } + + private SystemService createInstance(Class<?> clazz) { + // Make sure it's a type we expect + if (!SystemService.class.isAssignableFrom(clazz)) { + reportWtf("Class " + clazz.getName() + " does not extend " + + SystemService.class.getName()); + } + + try { + return (SystemService) clazz.newInstance(); + } catch (InstantiationException e) { + reportWtf("Class " + clazz.getName() + " is abstract", e); + } catch (IllegalAccessException e) { + reportWtf("Class " + clazz.getName() + + " must have a public no-arg constructor", e); + } + return null; + } + + private static void reportWtf(String message) { + reportWtf(message, null); + } + + private static void reportWtf(String message, Throwable e) { + Slog.i(TAG, "******************************"); + Log.wtf(TAG, message, e); + + // Make sure we die + throw new RuntimeException(message, e); + } +} |