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      1 /*
      2  * Copyright (C) 2015 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 package com.android.car;
     17 
     18 import android.app.Notification;
     19 import android.app.NotificationChannel;
     20 import android.app.NotificationManager;
     21 import android.content.Context;
     22 import android.os.Build;
     23 import android.util.Log;
     24 
     25 import com.android.internal.annotations.GuardedBy;
     26 
     27 import java.util.HashSet;
     28 import java.util.Set;
     29 
     30 /**
     31  * Class used to notify user about CAN bus failure.
     32  */
     33 final class CanBusErrorNotifier {
     34     private static final String TAG = CarLog.TAG_CAN_BUS + ".NOTIFIER";
     35     private static final int NOTIFICATION_ID = 1;
     36     private static final boolean IS_RELEASE_BUILD = "user".equals(Build.TYPE);
     37 
     38     private final Context mContext;
     39     private final NotificationManager mNotificationManager;
     40 
     41     // Contains a set of objects that reported failure. The notification will be hidden only when
     42     // this set is empty (all reported objects are in love and peace with the vehicle).
     43     @GuardedBy("this")
     44     private final Set<Object> mReportedObjects = new HashSet<>();
     45 
     46     CanBusErrorNotifier(Context context) {
     47         mNotificationManager = (NotificationManager) context.getSystemService(
     48                 Context.NOTIFICATION_SERVICE);
     49         mContext = context;
     50     }
     51 
     52     public void removeFailureReport(Object sender) {
     53         setCanBusFailure(false, sender);
     54     }
     55 
     56     public void reportFailure(Object sender) {
     57         setCanBusFailure(true, sender);
     58     }
     59 
     60     private void setCanBusFailure(boolean failed, Object sender) {
     61         boolean shouldShowNotification;
     62         synchronized (this) {
     63             boolean changed = failed
     64                     ? mReportedObjects.add(sender) : mReportedObjects.remove(sender);
     65 
     66             if (!changed) {
     67                 return;
     68             }
     69 
     70             shouldShowNotification = !mReportedObjects.isEmpty();
     71         }
     72 
     73         if (Log.isLoggable(TAG, Log.INFO)) {
     74             Log.i(TAG, "Changing CAN bus failure state to " + shouldShowNotification);
     75         }
     76 
     77         if (shouldShowNotification) {
     78             showNotification();
     79         } else {
     80             hideNotification();
     81         }
     82     }
     83 
     84     private void showNotification() {
     85         if (IS_RELEASE_BUILD) {
     86             // TODO: for user, we should show message to take car to the dealer. bug:32096297
     87             return;
     88         }
     89         Notification notification =
     90                 new Notification.Builder(mContext, NotificationChannel.DEFAULT_CHANNEL_ID)
     91                         .setContentTitle(mContext.getString(R.string.car_can_bus_failure))
     92                         .setContentText(mContext.getString(R.string.car_can_bus_failure_desc))
     93                         .setSmallIcon(R.drawable.car_ic_error)
     94                         .setOngoing(true)
     95                         .build();
     96         mNotificationManager.notify(TAG, NOTIFICATION_ID, notification);
     97     }
     98 
     99     private void hideNotification() {
    100         if (IS_RELEASE_BUILD) {
    101             // TODO: for user, we should show message to take car to the dealer. bug:32096297
    102             return;
    103         }
    104         mNotificationManager.cancel(TAG, NOTIFICATION_ID);
    105     }
    106 }
    107