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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.app.cts.android.app.cts.tools;
     18 
     19 import android.content.BroadcastReceiver;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.IntentFilter;
     23 import android.os.SystemClock;
     24 
     25 /**
     26  * Helper to wait for a broadcast to be sent.
     27  */
     28 public class WaitForBroadcast {
     29     final Context mContext;
     30 
     31     String mWaitingAction;
     32     boolean mHasResult;
     33     Intent mReceivedIntent;
     34 
     35     final BroadcastReceiver mReceiver = new BroadcastReceiver() {
     36         @Override public void onReceive(Context context, Intent intent) {
     37             synchronized (WaitForBroadcast.this) {
     38                 mReceivedIntent = intent;
     39                 mHasResult = true;
     40                 WaitForBroadcast.this.notifyAll();
     41             }
     42         }
     43     };
     44 
     45     public WaitForBroadcast(Context context) {
     46         mContext = context;
     47     }
     48 
     49     public void prepare(String action) {
     50         if (mWaitingAction != null) {
     51             throw new IllegalStateException("Already prepared");
     52         }
     53         mWaitingAction = action;
     54         IntentFilter filter = new IntentFilter();
     55         filter.addAction(action);
     56         mContext.registerReceiver(mReceiver, filter);
     57     }
     58 
     59     public Intent doWait(long timeout) {
     60         final long endTime = SystemClock.uptimeMillis() + timeout;
     61 
     62         synchronized (this) {
     63             while (!mHasResult) {
     64                 final long now = SystemClock.uptimeMillis();
     65                 if (now >= endTime) {
     66                     String action = mWaitingAction;
     67                     cleanup();
     68                     throw new IllegalStateException("Timed out waiting for broadcast " + action);
     69                 }
     70                 try {
     71                     wait(endTime - now);
     72                 } catch (InterruptedException e) {
     73                 }
     74             }
     75             cleanup();
     76             return mReceivedIntent;
     77         }
     78     }
     79 
     80     void cleanup() {
     81         if (mWaitingAction != null) {
     82             mContext.unregisterReceiver(mReceiver);
     83             mWaitingAction = null;
     84         }
     85     }
     86 }
     87