1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
5  * except in compliance with the License. You may obtain a copy of the License at
6  *
7  *      http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software distributed under the
10  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
11  * KIND, either express or implied. See the License for the specific language governing
12  * permissions and limitations under the License.
13  */
14 
15 package com.android.systemui;
16 
17 import android.util.Log;
18 
19 import com.android.systemui.statusbar.phone.StatusBar;
20 
21 import java.io.FileDescriptor;
22 import java.io.PrintWriter;
23 
24 /**
25  * Ensure a single status bar service implementation is running at all times, using the in-process
26  * implementation according to the product config.
27  */
28 public class SystemBars extends SystemUI {
29     private static final String TAG = "SystemBars";
30     private static final boolean DEBUG = false;
31     private static final int WAIT_FOR_BARS_TO_DIE = 500;
32 
33     // in-process fallback implementation, per the product config
34     private SystemUI mStatusBar;
35 
36     @Override
start()37     public void start() {
38         if (DEBUG) Log.d(TAG, "start");
39         createStatusBarFromConfig();
40     }
41 
42     @Override
dump(FileDescriptor fd, PrintWriter pw, String[] args)43     public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
44         if (mStatusBar != null) {
45             mStatusBar.dump(fd, pw, args);
46         }
47     }
48 
createStatusBarFromConfig()49     private void createStatusBarFromConfig() {
50         if (DEBUG) Log.d(TAG, "createStatusBarFromConfig");
51         final String clsName = mContext.getString(R.string.config_statusBarComponent);
52         if (clsName == null || clsName.length() == 0) {
53             throw andLog("No status bar component configured", null);
54         }
55         Class<?> cls = null;
56         try {
57             cls = mContext.getClassLoader().loadClass(clsName);
58         } catch (Throwable t) {
59             throw andLog("Error loading status bar component: " + clsName, t);
60         }
61         try {
62             mStatusBar = (SystemUI) cls.newInstance();
63         } catch (Throwable t) {
64             throw andLog("Error creating status bar component: " + clsName, t);
65         }
66         mStatusBar.mContext = mContext;
67         mStatusBar.mComponents = mComponents;
68         if (mStatusBar instanceof StatusBar) {
69             SystemUIFactory.getInstance().getRootComponent()
70                     .getStatusBarInjector()
71                     .createStatusBar((StatusBar) mStatusBar);
72         }
73         mStatusBar.start();
74         if (DEBUG) Log.d(TAG, "started " + mStatusBar.getClass().getSimpleName());
75     }
76 
andLog(String msg, Throwable t)77     private RuntimeException andLog(String msg, Throwable t) {
78         Log.w(TAG, msg, t);
79         throw new RuntimeException(msg, t);
80     }
81 }
82