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@Component
public class ConsumerService {
protected final Logger logger = LoggerFactory.getLogger(this.getClass());
private static ExecutorService executorService = new ThreadPoolExecutor(2,2,60,
TimeUnit.SECONDS,new SynchronousQueue<>());
private static List<KafkaConsumer> consumers = new ArrayList<KafkaConsumer>();
@Autowired
private DBService dbService;
@Autowired
private KafkaTemplate kafkaTemplate;
@Value("${kafka.consumer.servers}")
private String servers;
@Value("${kafka.consumer.enable.auto.commit}")
private boolean enableAutoCommit;
@Value("${kafka.consumer.session.timeout}")
private String sessionTimeout;
@Value("${kafka.consumer.auto.commit.interval}")
private String autoCommitInterval;
@Value("${kafka.consumer.group.id}")
private String groupId;
@Value("${kafka.consumer.auto.offset.reset}")
private String autoOffsetReset;
@Value("${kafka.consumer.concurrency}")
private int concurrency;
public Map<String, Object> consumerConfigs() {
Map<String, Object> propsMap = new HashMap<>();
propsMap.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, servers);
propsMap.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, enableAutoCommit);
propsMap.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, autoCommitInterval);
propsMap.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, sessionTimeout);
propsMap.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
propsMap.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
propsMap.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
propsMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, autoOffsetReset);
propsMap.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG,1);
return propsMap;
}
private static class ConsumerWorker implements Runnable{
private KafkaConsumer<String,String> consumer;
private DBService dbService;
private KafkaTemplate kafkaTemplate;
public ConsumerWorker(KafkaConsumer<String, String> consumer,DBService dbService,KafkaTemplate kafkaTemplate) {
this.consumer = consumer;
this.dbService = dbService;
this.kafkaTemplate = kafkaTemplate;
consumer.subscribe(Collections.singletonList("traffic-shaping"));
}
public void run() {
final String id = Thread.currentThread().getId() +"-"+System.identityHashCode(consumer);
try {
while(true){
ConsumerRecords<String, String> records = consumer.poll(100);
for(ConsumerRecord<String, String> record:records){
System.out.println(id+"|"+String.format(
"主题：%s，分区：%d，偏移量：%d，" + "key：%s，value：%s",
record.topic(),record.partition(),record.offset(),record.key(),record.value()));
System.out.println("开始购票业务－－－－－－");
String result = dbService.useDb("select ticket");
System.out.println(result+"，准备通知客户端");
kafkaTemplate.send("traffic-shaping-result",result);
}
}
}catch (Exception e) {
e.printStackTrace();
}
}
}
@PostConstruct
public void init(){
for(int i=0;i<2;i++){
KafkaConsumer<String,String> consumer = new KafkaConsumer<String,String>(consumerConfigs());
executorService.submit(new ConsumerWorker(consumer,dbService,kafkaTemplate));
consumers.add(consumer);
}
}
@PreDestroy
public void destory(){
for(KafkaConsumer consumer:consumers){
consumer.close();
}
}
}
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