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/*
* 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;
// Services that should receive lifecycle events.
private final ArrayList<SystemService> mServices = new ArrayList<SystemService>();
private int mCurrentPhase = -1;
public SystemServiceManager(Context context) {
mContext = context;
}
/**
* 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);
}
}
}
/**
* 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);
}
}
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