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fffce2e335
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package com.baeldung.springamqp.exponentialbackoff;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class ExponentialBackoffApp {
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public static void main(String[] args) {
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SpringApplication.run(ExponentialBackoffApp.class, args);
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}
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}
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package com.baeldung.springamqp.exponentialbackoff;
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import org.springframework.amqp.core.Message;
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import org.springframework.amqp.rabbit.retry.RejectAndDontRequeueRecoverer;
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public class ObservableRejectAndDontRequeueRecoverer extends RejectAndDontRequeueRecoverer {
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private Runnable observer;
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@Override
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public void recover(Message message, Throwable cause) {
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if(observer != null) {
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observer.run();
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}
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super.recover(message, cause);
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}
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void setObserver(Runnable observer){
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this.observer = observer;
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}
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}
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package com.baeldung.springamqp.exponentialbackoff;
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import org.aopalliance.aop.Advice;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.amqp.core.AmqpAdmin;
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import org.springframework.amqp.core.Message;
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import org.springframework.amqp.core.MessageProperties;
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import org.springframework.amqp.core.Queue;
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import org.springframework.amqp.core.QueueBuilder;
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import org.springframework.amqp.rabbit.annotation.EnableRabbit;
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import org.springframework.amqp.rabbit.annotation.RabbitListener;
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import org.springframework.amqp.rabbit.config.RetryInterceptorBuilder;
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import org.springframework.amqp.rabbit.config.SimpleRabbitListenerContainerFactory;
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import org.springframework.amqp.rabbit.connection.CachingConnectionFactory;
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import org.springframework.amqp.rabbit.connection.ConnectionFactory;
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import org.springframework.amqp.rabbit.core.RabbitAdmin;
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import org.springframework.amqp.rabbit.core.RabbitTemplate;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.retry.interceptor.RetryOperationsInterceptor;
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import com.rabbitmq.client.Channel;
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@EnableRabbit
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@Configuration
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public class RabbitConfiguration {
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private static Logger logger = LoggerFactory.getLogger(RabbitConfiguration.class);
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@Bean
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public ConnectionFactory connectionFactory() {
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return new CachingConnectionFactory("localhost");
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}
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@Bean
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public AmqpAdmin amqpAdmin() {
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return new RabbitAdmin(connectionFactory());
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}
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@Bean
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public RabbitTemplate rabbitTemplate() {
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return new RabbitTemplate(connectionFactory());
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}
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@Bean
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public Queue blockingQueue() {
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return QueueBuilder.nonDurable("blocking-queue")
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.build();
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}
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@Bean
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public Queue nonBlockingQueue() {
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return QueueBuilder.nonDurable("non-blocking-queue")
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.build();
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}
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@Bean
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public Queue retryWaitEndedQueue() {
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return QueueBuilder.nonDurable("retry-wait-ended-queue")
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.build();
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}
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@Bean
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public Queue retryQueue1() {
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return QueueBuilder.nonDurable("retry-queue-1")
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.deadLetterExchange("")
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.deadLetterRoutingKey("retry-wait-ended-queue")
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.build();
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}
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@Bean
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public Queue retryQueue2() {
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return QueueBuilder.nonDurable("retry-queue-2")
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.deadLetterExchange("")
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.deadLetterRoutingKey("retry-wait-ended-queue")
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.build();
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}
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@Bean
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public Queue retryQueue3() {
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return QueueBuilder.nonDurable("retry-queue-3")
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.deadLetterExchange("")
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.deadLetterRoutingKey("retry-wait-ended-queue")
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.build();
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}
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@Bean
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public RetryQueues retryQueues() {
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return new RetryQueues(1000, 3.0, 10000, retryQueue1(), retryQueue2(), retryQueue3());
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}
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@Bean
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public ObservableRejectAndDontRequeueRecoverer observableRecoverer() {
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return new ObservableRejectAndDontRequeueRecoverer();
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}
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@Bean
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public RetryOperationsInterceptor retryInterceptor() {
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return RetryInterceptorBuilder.stateless()
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.backOffOptions(1000, 3.0, 10000)
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.maxAttempts(5)
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.recoverer(observableRecoverer())
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.build();
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}
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@Bean
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public RetryQueuesInterceptor retryQueuesInterceptor(RabbitTemplate rabbitTemplate, RetryQueues retryQueues) {
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return new RetryQueuesInterceptor(rabbitTemplate, retryQueues);
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}
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@Bean
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public SimpleRabbitListenerContainerFactory defaultContainerFactory(ConnectionFactory connectionFactory) {
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SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
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factory.setConnectionFactory(connectionFactory);
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return factory;
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}
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@Bean
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public SimpleRabbitListenerContainerFactory retryContainerFactory(ConnectionFactory connectionFactory, RetryOperationsInterceptor retryInterceptor) {
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SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
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factory.setConnectionFactory(connectionFactory);
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Advice[] adviceChain = { retryInterceptor };
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factory.setAdviceChain(adviceChain);
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return factory;
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}
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@Bean
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public SimpleRabbitListenerContainerFactory retryQueuesContainerFactory(ConnectionFactory connectionFactory, RetryQueuesInterceptor retryInterceptor) {
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SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
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factory.setConnectionFactory(connectionFactory);
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Advice[] adviceChain = { retryInterceptor };
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factory.setAdviceChain(adviceChain);
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return factory;
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}
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@RabbitListener(queues = "blocking-queue", containerFactory = "retryContainerFactory")
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public void consumeBlocking(String payload) throws Exception {
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logger.info("Processing message from blocking-queue: {}", payload);
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throw new Exception("exception occured!");
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}
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@RabbitListener(queues = "non-blocking-queue", containerFactory = "retryQueuesContainerFactory", ackMode = "MANUAL")
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public void consumeNonBlocking(String payload) throws Exception {
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logger.info("Processing message from non-blocking-queue: {}", payload);
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throw new Exception("Error occured!");
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}
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@RabbitListener(queues = "retry-wait-ended-queue", containerFactory = "defaultContainerFactory")
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public void consumeRetryWaitEndedMessage(String payload, Message message, Channel channel) throws Exception {
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MessageProperties props = message.getMessageProperties();
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rabbitTemplate().convertAndSend(props.getHeader("x-original-exchange"), props.getHeader("x-original-routing-key"), message);
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}
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}
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package com.baeldung.springamqp.exponentialbackoff;
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import org.springframework.amqp.core.Queue;
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public class RetryQueues {
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private Queue[] queues;
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private long initialInterval;
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private double factor;
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private long maxWait;
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public RetryQueues(long initialInterval, double factor, long maxWait, Queue... queues) {
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this.queues = queues;
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this.initialInterval = initialInterval;
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this.factor = factor;
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this.maxWait = maxWait;
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}
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public boolean retriesExhausted(int retry) {
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return retry >= queues.length;
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}
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public String getQueueName(int retry) {
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return queues[retry].getName();
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}
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public long getTimeToWait(int retry) {
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double time = initialInterval * Math.pow(factor, (double) retry);
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if (time > maxWait) {
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return maxWait;
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}
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return (long) time;
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}
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}
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package com.baeldung.springamqp.exponentialbackoff;
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import java.util.function.BiConsumer;
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import java.util.function.Consumer;
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import com.rabbitmq.client.Channel;
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import org.aopalliance.intercept.MethodInterceptor;
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import org.aopalliance.intercept.MethodInvocation;
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import org.springframework.amqp.core.Message;
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import org.springframework.amqp.core.MessageProperties;
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import org.springframework.amqp.rabbit.core.RabbitTemplate;
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public class RetryQueuesInterceptor implements MethodInterceptor {
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private RabbitTemplate rabbitTemplate;
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private RetryQueues retryQueues;
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private Runnable observer;
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public RetryQueuesInterceptor(RabbitTemplate rabbitTemplate, RetryQueues retryQueues) {
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this.rabbitTemplate = rabbitTemplate;
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this.retryQueues = retryQueues;
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}
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@Override
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public Object invoke(MethodInvocation invocation) throws Throwable {
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return tryConsume(invocation, this::ack, (mac, e) -> {
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try {
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int retryCount = tryGetRetryCountOrFail(mac, e);
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sendToNextRetryQueue(mac, retryCount);
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} catch (Throwable t) {
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if (observer != null) {
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observer.run();
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}
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throw new RuntimeException(t);
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}
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});
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}
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void setObserver(Runnable observer) {
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this.observer = observer;
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}
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private Object tryConsume(MethodInvocation invocation, Consumer<MessageAndChannel> successHandler, BiConsumer<MessageAndChannel, Throwable> errorHandler) throws Throwable {
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MessageAndChannel mac = new MessageAndChannel((Message) invocation.getArguments()[1], (Channel) invocation.getArguments()[0]);
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Object ret = null;
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try {
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ret = invocation.proceed();
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successHandler.accept(mac);
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} catch (Throwable e) {
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errorHandler.accept(mac, e);
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}
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return ret;
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}
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private void ack(MessageAndChannel mac) {
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try {
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mac.channel.basicAck(mac.message.getMessageProperties()
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.getDeliveryTag(), false);
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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private int tryGetRetryCountOrFail(MessageAndChannel mac, Throwable originalError) throws Throwable {
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MessageProperties props = mac.message.getMessageProperties();
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String xRetriedCountHeader = (String) props.getHeader("x-retried-count");
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final int xRetriedCount = xRetriedCountHeader == null ? 0 : Integer.valueOf(xRetriedCountHeader);
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if (retryQueues.retriesExhausted(xRetriedCount)) {
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mac.channel.basicReject(props.getDeliveryTag(), false);
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throw originalError;
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}
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return xRetriedCount;
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}
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private void sendToNextRetryQueue(MessageAndChannel mac, int retryCount) throws Exception {
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String retryQueueName = retryQueues.getQueueName(retryCount);
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rabbitTemplate.convertAndSend(retryQueueName, mac.message, m -> {
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MessageProperties props = m.getMessageProperties();
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props.setExpiration(String.valueOf(retryQueues.getTimeToWait(retryCount)));
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props.setHeader("x-retried-count", String.valueOf(retryCount + 1));
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props.setHeader("x-original-exchange", props.getReceivedExchange());
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props.setHeader("x-original-routing-key", props.getReceivedRoutingKey());
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return m;
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});
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mac.channel.basicReject(mac.message.getMessageProperties()
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.getDeliveryTag(), false);
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}
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private class MessageAndChannel {
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private Message message;
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private Channel channel;
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private MessageAndChannel(Message message, Channel channel) {
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this.message = message;
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this.channel = channel;
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}
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}
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}
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@ -0,0 +1,58 @@
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package com.baeldung.springamqp.exponentialbackoff;
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import java.util.concurrent.CountDownLatch;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.springframework.amqp.rabbit.core.RabbitTemplate;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.test.context.ContextConfiguration;
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import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
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/**
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* This live test requires:
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*
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* - A running RabbitMQ instance on localhost (e.g. docker run -p 5672:5672 -p 15672:15672 --name rabbit rabbitmq:3-management)
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*
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*/
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@RunWith(SpringJUnit4ClassRunner.class)
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@ContextConfiguration(classes = { RabbitConfiguration.class })
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public class ExponentialBackoffLiveTest {
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@Autowired
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private RabbitTemplate rabbitTemplate;
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@Autowired
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private ObservableRejectAndDontRequeueRecoverer observableRecoverer;
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@Autowired
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private RetryQueuesInterceptor retryQueues;
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@Test
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public void whenSendToBlockingQueue_thenAllMessagesProcessed() throws Exception {
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int nb = 2;
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CountDownLatch latch = new CountDownLatch(nb);
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observableRecoverer.setObserver(() -> latch.countDown());
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for (int i = 1; i <= nb; i++) {
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rabbitTemplate.convertAndSend("blocking-queue", "blocking message " + i);
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}
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latch.await();
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}
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@Test
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public void whenSendToNonBlockingQueue_thenAllMessageProcessed() throws Exception {
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int nb = 2;
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CountDownLatch latch = new CountDownLatch(nb);
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retryQueues.setObserver(() -> latch.countDown());
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for (int i = 1; i <= nb; i++) {
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rabbitTemplate.convertAndSend("non-blocking-queue", "non-blocking message " + i);
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}
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latch.await();
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}
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}
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@ -0,0 +1,6 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<configuration>
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<include
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resource="org/springframework/boot/logging/logback/base.xml" />
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<logger name="org.springframework" level="INFO" />
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</configuration>
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