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      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
     37     public void start() {
     38         if (DEBUG) Log.d(TAG, "start");
     39         createStatusBarFromConfig();
     40     }
     41 
     42     @Override
     43     public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
     44         if (mStatusBar != null) {
     45             mStatusBar.dump(fd, pw, args);
     46         }
     47     }
     48 
     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 
     77     private RuntimeException andLog(String msg, Throwable t) {
     78         Log.w(TAG, msg, t);
     79         throw new RuntimeException(msg, t);
     80     }
     81 }
     82