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1 /*
2  * Copyright (C) 2013 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.systemui.statusbar;
18 
19 import android.content.res.Configuration;
20 import android.provider.Settings;
21 import android.util.Log;
22 
23 import com.android.systemui.R;
24 import com.android.systemui.SystemUI;
25 
26 import java.io.FileDescriptor;
27 import java.io.PrintWriter;
28 
29 /**
30  * Ensure a single status bar service implementation is running at all times.
31  *
32  * <p>The implementation either comes from a service component running in a remote process (defined
33  * using a secure setting), else falls back to using the in-process implementation according
34  * to the product config.
35  */
36 public class SystemBars extends SystemUI implements ServiceMonitor.Callbacks {
37     private static final String TAG = "SystemBars";
38     private static final boolean DEBUG = false;
39     private static final int WAIT_FOR_BARS_TO_DIE = 500;
40 
41     // manages the implementation coming from the remote process
42     private ServiceMonitor mServiceMonitor;
43 
44     // in-process fallback implementation, per the product config
45     private BaseStatusBar mStatusBar;
46 
47     @Override
start()48     public void start() {
49         if (DEBUG) Log.d(TAG, "start");
50         mServiceMonitor = new ServiceMonitor(TAG, DEBUG,
51                 mContext, Settings.Secure.BAR_SERVICE_COMPONENT, this);
52         mServiceMonitor.start();  // will call onNoService if no remote service is found
53     }
54 
55     @Override
onNoService()56     public void onNoService() {
57         if (DEBUG) Log.d(TAG, "onNoService");
58         createStatusBarFromConfig();  // fallback to using an in-process implementation
59     }
60 
61     @Override
onServiceStartAttempt()62     public long onServiceStartAttempt() {
63         if (DEBUG) Log.d(TAG, "onServiceStartAttempt mStatusBar="+mStatusBar);
64         if (mStatusBar != null) {
65             // tear down the in-process version, we'll recreate it again if needed
66             mStatusBar.destroy();
67             mStatusBar = null;
68             return WAIT_FOR_BARS_TO_DIE;
69         }
70         return 0;
71     }
72 
73     @Override
onConfigurationChanged(Configuration newConfig)74     protected void onConfigurationChanged(Configuration newConfig) {
75         if (mStatusBar != null) {
76             mStatusBar.onConfigurationChanged(newConfig);
77         }
78     }
79 
80     @Override
dump(FileDescriptor fd, PrintWriter pw, String[] args)81     public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
82         if (mStatusBar != null) {
83             mStatusBar.dump(fd, pw, args);
84         }
85     }
86 
createStatusBarFromConfig()87     private void createStatusBarFromConfig() {
88         if (DEBUG) Log.d(TAG, "createStatusBarFromConfig");
89         final String clsName = mContext.getString(R.string.config_statusBarComponent);
90         if (clsName == null || clsName.length() == 0) {
91             throw andLog("No status bar component configured", null);
92         }
93         Class<?> cls = null;
94         try {
95             cls = mContext.getClassLoader().loadClass(clsName);
96         } catch (Throwable t) {
97             throw andLog("Error loading status bar component: " + clsName, t);
98         }
99         try {
100             mStatusBar = (BaseStatusBar) cls.newInstance();
101         } catch (Throwable t) {
102             throw andLog("Error creating status bar component: " + clsName, t);
103         }
104         mStatusBar.mContext = mContext;
105         mStatusBar.mComponents = mComponents;
106         mStatusBar.start();
107         if (DEBUG) Log.d(TAG, "started " + mStatusBar.getClass().getSimpleName());
108     }
109 
andLog(String msg, Throwable t)110     private RuntimeException andLog(String msg, Throwable t) {
111         Log.w(TAG, msg, t);
112         throw new RuntimeException(msg, t);
113     }
114 }
115