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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.server.cts.storaged;
     18 
     19 import android.app.Service;
     20 import android.content.Intent;
     21 import android.os.Handler;
     22 import android.os.HandlerThread;
     23 import android.os.IBinder;
     24 import android.os.Looper;
     25 import android.os.Message;
     26 import android.os.Process;
     27 import android.util.Log;
     28 
     29 import java.io.BufferedReader;
     30 import java.io.File;
     31 import java.io.FileReader;
     32 import java.io.FileWriter;
     33 import java.io.IOException;
     34 
     35 public class SimpleIOService extends Service {
     36     private Looper mServiceLooper;
     37     private ServiceHandler mServiceHandler;
     38 
     39     private final class ServiceHandler extends Handler {
     40         private String getCgroupCpuset() {
     41             File cgroup = new File("/proc/self/cgroup");
     42             try (BufferedReader br = new BufferedReader(new FileReader(cgroup))) {
     43                 String line;
     44                 while ((line = br.readLine()) != null) {
     45                     String[] parts = line.split(":");
     46                     if (parts.length >= 3 && parts[1].equals("cpuset")) {
     47                         return parts[2];
     48                     }
     49                 }
     50             } catch (IOException e) {
     51             }
     52             return null;
     53         }
     54 
     55         public ServiceHandler(Looper looper) {
     56             super(looper);
     57 
     58             // Spin for 20 seconds until we are not in the foreground. (Note
     59             // that UsageStatsService considers "foreground" to be in the
     60             // background - only top and persistent processes are reported as
     61             // foreground for uid_io).
     62             for (int i = 1; i <= 200; i++) {
     63                 String cpuset = getCgroupCpuset();
     64                 if (cpuset == null || !cpuset.equals("/top")) {
     65                     break;
     66                 }
     67                 try {
     68                     Thread.sleep(100);
     69                 } catch (InterruptedException e) {
     70                 }
     71             }
     72 
     73             Log.i("SimpleIOService", "cgroup:" + getCgroupCpuset());
     74         }
     75 
     76         @Override
     77         public void handleMessage(Message msg) {
     78             File testFile = new File(getFilesDir(), "StoragedTest_Temp_BG");
     79             try {
     80                 char data[] = new char[4096];
     81                 FileWriter w = new FileWriter(testFile);
     82                 w.write(data);
     83                 w.flush();
     84                 w.close();
     85             } catch (IOException e) {
     86                 throw new RuntimeException(e);
     87             } finally {
     88                 // Stop the service using the startId, so that we don't stop
     89                 // the service in the middle of handling another job
     90                 stopSelf(msg.arg1);
     91             }
     92         }
     93     }
     94 
     95     @Override
     96     public void onCreate() {
     97         // Start up the thread running the service.  Note that we create a
     98         // separate thread because the service normally runs in the process's
     99         // main thread, which we don't want to block.  We also make it
    100         // background priority so CPU-intensive work will not disrupt our UI.
    101         HandlerThread thread = new HandlerThread("ServiceStartArguments",
    102                 Process.THREAD_PRIORITY_BACKGROUND);
    103         thread.start();
    104 
    105         // Get the HandlerThread's Looper and use it for our Handler
    106         mServiceLooper = thread.getLooper();
    107         mServiceHandler = new ServiceHandler(mServiceLooper);
    108     }
    109 
    110     @Override
    111     public int onStartCommand(Intent intent, int flags, int startId) {
    112         Message msg = mServiceHandler.obtainMessage();
    113         msg.arg1 = startId;
    114         mServiceHandler.sendMessage(msg);
    115 
    116         return START_NOT_STICKY;
    117     }
    118 
    119     @Override
    120     public IBinder onBind(Intent intent) {
    121         return null;
    122     }
    123 }
    124