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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.util.Log;
     25 
     26 import androidx.annotation.NonNull;
     27 import androidx.annotation.VisibleForTesting;
     28 
     29 public class SystemPropPoker  {
     30     private static final String TAG = "SystemPropPoker";
     31 
     32     private static final SystemPropPoker sInstance = new SystemPropPoker();
     33 
     34     private boolean mBlockPokes = false;
     35 
     36     private SystemPropPoker() {}
     37 
     38     @NonNull
     39     public static SystemPropPoker getInstance() {
     40         return sInstance;
     41     }
     42 
     43     public void blockPokes() {
     44         mBlockPokes = true;
     45     }
     46 
     47     public void unblockPokes() {
     48         mBlockPokes = false;
     49     }
     50 
     51     public void poke() {
     52         if (!mBlockPokes) {
     53             createPokerTask().execute();
     54         }
     55     }
     56 
     57     @VisibleForTesting
     58     PokerTask createPokerTask() {
     59         return new PokerTask();
     60     }
     61 
     62     public static class PokerTask extends AsyncTask<Void, Void, Void> {
     63 
     64         @VisibleForTesting
     65         String[] listServices() {
     66             return ServiceManager.listServices();
     67         }
     68 
     69         @VisibleForTesting
     70         IBinder checkService(String service) {
     71             return ServiceManager.checkService(service);
     72         }
     73 
     74         @Override
     75         protected Void doInBackground(Void... params) {
     76             String[] services = listServices();
     77             if (services == null) {
     78                 Log.e(TAG, "There are no services, how odd");
     79                 return null;
     80             }
     81             for (String service : services) {
     82                 IBinder obj = checkService(service);
     83                 if (obj != null) {
     84                     Parcel data = Parcel.obtain();
     85                     try {
     86                         obj.transact(IBinder.SYSPROPS_TRANSACTION, data, null, 0);
     87                     } catch (RemoteException e) {
     88                         // Ignore
     89                     } catch (Exception e) {
     90                         Log.i(TAG, "Someone wrote a bad service '" + service
     91                                 + "' that doesn't like to be poked", e);
     92                     }
     93                     data.recycle();
     94                 }
     95             }
     96             return null;
     97         }
     98     }
     99 }
    100