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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.google.android.car.vms.publisher;
     18 
     19 import android.car.vms.VmsLayer;
     20 import android.car.vms.VmsPublisherClientService;
     21 import android.car.vms.VmsSubscriptionState;
     22 import android.os.Handler;
     23 import android.os.Message;
     24 
     25 import java.util.concurrent.atomic.AtomicBoolean;
     26 
     27 /**
     28  * This service is launched during the initialization of the VMS publisher service.
     29  * Once onVmsPublisherServiceReady is invoked, it starts publishing a single byte every second.
     30  */
     31 public class VmsPublisherClientSampleService extends VmsPublisherClientService {
     32     public static final int PUBLISH_EVENT = 0;
     33     public static final VmsLayer TEST_LAYER = new VmsLayer(0, 0, 0);
     34     public static final int PUBLISHER_ID = 1;
     35 
     36     private byte mCounter = 0;
     37     private AtomicBoolean mInitialized = new AtomicBoolean(false);
     38 
     39     private final Handler mHandler = new Handler() {
     40         @Override
     41         public void handleMessage(Message msg) {
     42             if (msg.what == PUBLISH_EVENT && mInitialized.get()) {
     43                 periodicPublish();
     44             }
     45         }
     46     };
     47 
     48     /**
     49      * Notifies that the publisher services are ready to be used: {@link #publish(VmsLayer, byte[])}
     50      * and {@link #getSubscriptions()}.
     51      */
     52     @Override
     53     public void onVmsPublisherServiceReady() {
     54         VmsSubscriptionState subscriptionState = getSubscriptions();
     55         onVmsSubscriptionChange(subscriptionState);
     56     }
     57 
     58     @Override
     59     public void onVmsSubscriptionChange(VmsSubscriptionState subscriptionState) {
     60         if (mInitialized.compareAndSet(false, true)) {
     61             for (VmsLayer layer : subscriptionState.getLayers()) {
     62                 if (layer.equals(TEST_LAYER)) {
     63                     mHandler.sendEmptyMessage(PUBLISH_EVENT);
     64                 }
     65             }
     66         }
     67     }
     68 
     69     @Override
     70     public void onDestroy() {
     71         super.onDestroy();
     72         mInitialized.set(false);
     73         mHandler.removeMessages(PUBLISH_EVENT);
     74     }
     75 
     76     private void periodicPublish() {
     77         publish(TEST_LAYER, PUBLISHER_ID, new byte[]{mCounter});
     78         ++mCounter;
     79         mHandler.sendEmptyMessageDelayed(PUBLISH_EVENT, 1000);
     80     }
     81 }
     82