前情提要
上一篇文章,我们为了解决实际场景中遇到的问题,使得其更像一个安全高效的邮件服务平台,我们引入了LinkedBlockingQueue队列对邮件发送进行流量削锋、间隔发送以及重复内容检测。
当然,文章末尾也就此方案提出了几点疑问,就比如邮件服务挂了,队列还没消费完怎么办?
怎么办?怎么办?还能怎么办,等着被老板扣工资吧!!!
有没有一种想屎的感觉的?
解决方案
由于LinkedBlockingQueue是进程内的队列,如果容器无情的挂掉以后,随之队列中的内容也便荡然无存。
其实你也可以不用去屎,山人自有妙计。
这里给大家介绍一款进程外的队列实现,redis,对没错就是有些人熟悉 有些人陌生的 NoSql数据库。
代码案例
pom.xml 引入以下依赖:
<!-- spring-boot-starter-redis -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-redis</artifactId>
<version>1.4.7.RELEASE</version>
</dependency>
定义接口(部分代码)
public void sendRedisQueue(Email mail) throws Exception;
定义实现(部分代码)
@Override
public void sendRedisQueue(Email mail) throws Exception {
redisTemplate.convertAndSend("mail",mail);
}
重写CachingConfigurerSupport
import java.lang.reflect.Method;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import com.fasterxml.jackson.databind.ObjectMapper;
@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
/**
* 自定义key(消息队列 暂时用不到 自行忽略)
* 此方法将会根据类名+方法名+所有参数的值生成唯一的一个key,即使@Cacheable中的value属性一样,key也会不一样。
* @Author 科帮网
* @return
* @Date 2017年8月13日
* 更新日志
* 2017年8月13日 科帮网 首次创建
*
*/
@Bean
public KeyGenerator keyGenerator() {
return new KeyGenerator() {
@Override
public Object generate(Object target, Method method,
Object... params) {
StringBuilder sb = new StringBuilder();
sb.append(target.getClass().getName());
sb.append(method.getName());
for (Object obj : params) {
sb.append(obj.toString());
}
return sb.toString();
}
};
}
/**
* 缓存管理器
* @Author 科帮网
* @param redisTemplate
* @return CacheManager
* @Date 2017年8月13日
* 更新日志
* 2017年8月13日 科帮网 首次创建
*/
@SuppressWarnings("rawtypes")
@Bean
public CacheManager cacheManager(RedisTemplate redisTemplate) {
return new RedisCacheManager(redisTemplate);
}
/**
* 序列化Java对象
* @Author 科帮网
* @param factory
* @return RedisTemplate<String,String>
* @Date 2017年8月13日
* 更新日志
* 2017年8月13日 科帮网 首次创建
*
*/
@Bean
public RedisTemplate<String, String> redisTemplate(
RedisConnectionFactory factory) {
StringRedisTemplate template = new StringRedisTemplate(factory);
setSerializer(template); //使用Jackson序列化
template.afterPropertiesSet();
return template;
}
@SuppressWarnings({ "rawtypes", "unchecked" })
private void setSerializer(StringRedisTemplate template) {
Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(
Object.class);
ObjectMapper om = new ObjectMapper();
//om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
//om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
jackson2JsonRedisSerializer.setObjectMapper(om);
template.setValueSerializer(jackson2JsonRedisSerializer);
}
}
配置RedisListener监听
import java.util.concurrent.CountDownLatch;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.listener.PatternTopic;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;
import org.springframework.stereotype.Component;
/**
* 注意 扫描监听 否则无法接收消息
* 创建者 科帮网
* 创建时间 2017年8月13日
*
*/
@Component
public class RedisListener {
private static final Logger LOGGER = LoggerFactory.getLogger(RedisListener.class);
@Bean
RedisMessageListenerContainer container(
RedisConnectionFactory connectionFactory,
MessageListenerAdapter listenerAdapter) {
LOGGER.info("启动监听");
RedisMessageListenerContainer container = new RedisMessageListenerContainer();
container.setConnectionFactory(connectionFactory);
container.addMessageListener(listenerAdapter, new PatternTopic("mail"));
return container;
}
@Bean
MessageListenerAdapter listenerAdapter(Receiver receiver) {
return new MessageListenerAdapter(receiver, "receiveMessage");
}
@Bean
Receiver receiver(CountDownLatch latch) {
return new Receiver(latch);
}
@Bean
CountDownLatch latch() {
return new CountDownLatch(1);
}
@Bean
StringRedisTemplate template(RedisConnectionFactory connectionFactory) {
return new StringRedisTemplate(connectionFactory);
}
}
定义Receiver接收着
import java.io.IOException;
import java.util.concurrent.CountDownLatch;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.itstyle.mail.model.Email;
import com.itstyle.mail.service.IMailService;
public class Receiver {
private static final Logger LOGGER = LoggerFactory.getLogger(Receiver.class);
@Autowired
private IMailService mailService;
private CountDownLatch latch;
@Autowired
public Receiver(CountDownLatch latch) {
this.latch = latch;
}
public void receiveMessage(String message) {
LOGGER.info("接收email消息 <{}>",message);
if(message == null){
LOGGER.info("接收email消息 <" + null + ">");
}else {
ObjectMapper mapper = new ObjectMapper();
try {
Email email = mapper.readValue(message, Email.class);
mailService.send(email);
LOGGER.info("接收email消息内容 <{}>",email.getContent());
} catch (JsonParseException e) {
e.printStackTrace();
} catch (JsonMappingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
latch.countDown();
}
}
SpringbootMailApplication测试
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ImportResource;
import com.itstyle.mail.model.Email;
import com.itstyle.mail.service.IMailService;
@SpringBootApplication
@ComponentScan(basePackages={"com.itstyle.mail"})
@ImportResource({"classpath:spring-context-dubbo.xml","classpath:spring-context-task.xml"})
public class SpringbootMailApplication implements CommandLineRunner {
@Autowired
private IMailService mailService;
public static void main(String[] args) {
SpringApplication.run(SpringbootMailApplication.class, args);
}
@Override
public void run(String... args) {
try {
Email mail = new Email();
mail.setEmail(new String[]{"345849402@qq.com"});
mail.setSubject("你个小逗比");
mail.setContent("科帮网欢迎您");
mail.setTemplate("welcome");
for(int i=0;i<1000;i++){
mailService.sendRedisQueue(mail);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
详细代码案例:码云