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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 android.server.wm;
     18 
     19 import android.app.Service;
     20 import android.content.Intent;
     21 import android.os.IBinder;
     22 import android.util.Log;
     23 import java.util.HashMap;
     24 import java.util.Map;
     25 import java.util.concurrent.CountDownLatch;
     26 import java.util.concurrent.TimeUnit;
     27 
     28 /**
     29  *  A service collecting data from other apps used by a test.
     30  *
     31  *  Use {@link TestLogClient} to send data to this service.
     32  */
     33 public class TestLogService extends Service {
     34     private static final String TAG = "TestLogService";
     35 
     36     private static final Object mLock = new Object();
     37 
     38     static class ClientChannel {
     39         final String mStopKey;
     40         final CountDownLatch mLatch = new CountDownLatch(1);
     41         final Map<String, String> mResults = new HashMap<>();
     42 
     43         ClientChannel(String stopKey) {
     44             mStopKey = stopKey;
     45         }
     46     }
     47 
     48     private static Map<String, ClientChannel> mChannels = new HashMap<>();
     49 
     50     @Override
     51     public IBinder onBind(Intent intent) {
     52         return null;
     53     }
     54 
     55     @Override
     56     public int onStartCommand(Intent intent, int flags, int startId) {
     57         record(intent.getStringExtra(TestLogClient.EXTRA_LOG_TAG),
     58                 intent.getStringExtra(TestLogClient.EXTRA_KEY),
     59                 intent.getStringExtra(TestLogClient.EXTRA_VALUE));
     60         return START_NOT_STICKY;
     61     }
     62 
     63     /**
     64      * Prepare to receive results from a client with a specified tag.
     65      *
     66      * @param logtag Unique tag for the client.
     67      * @param stopKey The key that signals that the client has completed all required actions.
     68      */
     69     public static void registerClient(String logtag, String stopKey) {
     70         synchronized (mLock) {
     71             if (mChannels.containsKey(logtag)) {
     72                 throw new IllegalArgumentException(logtag);
     73             }
     74             mChannels.put(logtag, new ClientChannel(stopKey));
     75         }
     76     }
     77 
     78     /**
     79      * Wait for the client to complete all required actions and return the results.
     80      *
     81      * @param logtag Unique tag for the client.
     82      * @param timeoutMs Latch timeout in ms.
     83      * @return The map of results from the client
     84      */
     85     public static Map<String, String> getResultsForClient(String logtag, int timeoutMs) {
     86         Map<String, String> result = new HashMap<>();
     87         CountDownLatch latch;
     88         synchronized (mLock) {
     89             if (!mChannels.containsKey(logtag)) {
     90                 return result;
     91             }
     92             latch = mChannels.get(logtag).mLatch;
     93         }
     94         try {
     95             latch.await(timeoutMs, TimeUnit.MILLISECONDS);
     96         } catch (InterruptedException ignore) {
     97         }
     98         synchronized (mLock) {
     99             for (Map.Entry<String, String> e : mChannels.get(logtag).mResults.entrySet()) {
    100                 result.put(e.getKey(), e.getValue());
    101             }
    102         }
    103         return result;
    104     }
    105 
    106     private static void record(String logtag, String key, String value) {
    107         synchronized (mLock) {
    108             if (!mChannels.containsKey(logtag)) {
    109                 Log.e(TAG, "Unexpected logtag: " + logtag);
    110                 return;
    111             }
    112             ClientChannel channel = mChannels.get(logtag);
    113             channel.mResults.put(key, value);
    114             if (key.equals(channel.mStopKey)) {
    115                 channel.mLatch.countDown();
    116             }
    117         }
    118     }
    119 }
    120