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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.android.car.vms.publisher;
import android.car.vms.VmsLayer;
import android.car.vms.VmsPublisherClientService;
import android.os.Handler;
import android.os.Message;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* This service is launched during the initialization of the VMS publisher service.
* Once onVmsPublisherServiceReady is invoked, it starts publishing a single byte every second.
*/
public class VmsPublisherClientSampleService extends VmsPublisherClientService {
public static final int PUBLISH_EVENT = 0;
public static final int TEST_LAYER_ID = 0;
public static final int TEST_LAYER_VERSION = 0;
private byte mCounter = 0;
private AtomicBoolean mInitialized = new AtomicBoolean(false);
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (msg.what == PUBLISH_EVENT) {
periodicPublish();
}
}
};
/**
* Notifies that the publisher services are ready to be used: {@link #publish(int, int, byte[])}
* and {@link #getSubscribers()}.
*/
@Override
public void onVmsPublisherServiceReady() {
}
@Override
public void onVmsSubscriptionChange(List<VmsLayer> layers, long sequence) {
if (mInitialized.compareAndSet(false, true)) {
for (VmsLayer layer : layers) {
if (layer.getId() == TEST_LAYER_ID && layer.getVersion() == TEST_LAYER_VERSION) {
mHandler.sendEmptyMessage(PUBLISH_EVENT);
}
}
}
}
private void periodicPublish() {
publish(TEST_LAYER_ID, TEST_LAYER_VERSION, new byte[]{mCounter});
++mCounter;
mHandler.sendEmptyMessageDelayed(PUBLISH_EVENT, 1000);
}
}
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