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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");
      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.settingslib.development;
     18 
     19 import android.os.AsyncTask;
     20 import android.os.IBinder;
     21 import android.os.Parcel;
     22 import android.os.RemoteException;
     23 import android.os.ServiceManager;
     24 import android.support.annotation.NonNull;
     25 import android.support.annotation.VisibleForTesting;
     26 import android.util.Log;
     27 
     28 public class SystemPropPoker  {
     29     private static final String TAG = "SystemPropPoker";
     30 
     31     private static final SystemPropPoker sInstance = new SystemPropPoker();
     32 
     33     private boolean mBlockPokes = false;
     34 
     35     private SystemPropPoker() {}
     36 
     37     @NonNull
     38     public static SystemPropPoker getInstance() {
     39         return sInstance;
     40     }
     41 
     42     public void blockPokes() {
     43         mBlockPokes = true;
     44     }
     45 
     46     public void unblockPokes() {
     47         mBlockPokes = false;
     48     }
     49 
     50     public void poke() {
     51         if (!mBlockPokes) {
     52             createPokerTask().execute();
     53         }
     54     }
     55 
     56     @VisibleForTesting
     57     PokerTask createPokerTask() {
     58         return new PokerTask();
     59     }
     60 
     61     public static class PokerTask extends AsyncTask<Void, Void, Void> {
     62 
     63         @VisibleForTesting
     64         String[] listServices() {
     65             return ServiceManager.listServices();
     66         }
     67 
     68         @VisibleForTesting
     69         IBinder checkService(String service) {
     70             return ServiceManager.checkService(service);
     71         }
     72 
     73         @Override
     74         protected Void doInBackground(Void... params) {
     75             String[] services = listServices();
     76             if (services == null) {
     77                 Log.e(TAG, "There are no services, how odd");
     78                 return null;
     79             }
     80             for (String service : services) {
     81                 IBinder obj = checkService(service);
     82                 if (obj != null) {
     83                     Parcel data = Parcel.obtain();
     84                     try {
     85                         obj.transact(IBinder.SYSPROPS_TRANSACTION, data, null, 0);
     86                     } catch (RemoteException e) {
     87                         // Ignore
     88                     } catch (Exception e) {
     89                         Log.i(TAG, "Someone wrote a bad service '" + service
     90                                 + "' that doesn't like to be poked", e);
     91                     }
     92                     data.recycle();
     93                 }
     94             }
     95             return null;
     96         }
     97     }
     98 }
     99