storm和spring的结合

1 软件版本 storm0.10 +spring 4.36，网上的例子很少经过摸索除了sport和bolt无法注入其他类都可以了

2 类似于springmvc的结构，bolt service dao

3 因为bolt是由 nimbus 端实例化然后通过序列化传输到supervisor再反向序列化，所以bolt和sport无法通过spring注入

4 SpringBeanutil 类的加载工具

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

public class SpringBeanutil implements ApplicationContextAware {

    private static ApplicationContext applicationContext;
    
    
    
    
    @Override
    public void setApplicationContext(ApplicationContext arg0)
            throws BeansException {
        applicationContext=arg0;
        
    }
    
    public static <T> T getBean(String name,Class<T> clazz){
        if (applicationContext==null){
            SpringContext.SpringContextInit();
        }
        
        return applicationContext.getBean(name,clazz);
    }
    
    

}

5 spring加载SpringContext

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SpringContext {

   private static ApplicationContext applicationContext ;


   public static synchronized void SpringContextInit(){
       if (applicationContext==null){
           applicationContext =new ClassPathXmlApplicationContext("spring-demo2.xml");
           // applicationContext =new ClassPathXmlApplicationContext("spring-hbase.xml");
       }


   }

6 在bolt的 prepare 中调用对service进行实例化，需要继承BaseRichBolt

public class LoadBolt extends BaseRichBolt {

   /**
   *
   */
   private static final long serialVersionUID = 6084084850932212408L;
   Logger log = LoggerFactory.getLogger(LoadBolt.class);
   private LoadService service ;
   private OutputCollector collector;
   /**
   * 业务处理
   */
   public void execute(Tuple input) {

       service.execute(input, collector);



   }

   //申明了输出tuple的key是data
   public void declareOutputFields(OutputFieldsDeclarer declarer) {
       declarer.declare(new Fields("line"));

   }

   @Override
   public void prepare(Map map, TopologyContext context, OutputCollector collector) {
       this.collector=collector;
       service=SpringBeanutil.getBean("loadService", LoadService.class);
   }



}

}

7 service中就实现自己的业务逻辑，应该就是和springmvc一样不过要记得执行collector.ack(input);

经过测试aop功能，类的注入可以顺利使用，不过我使用fatjar来打包的药注意对spring 配置文件的合并，不然会报错，

还有要注意原先在bolt中使用的一些对象放在service中了，要注意有很多类不支持多线程并发操作

service接口

package com.nari.demo2.service;

import backtype.storm.task.OutputCollector;
import backtype.storm.tuple.Tuple;
import org.slf4j.Logger;
public interface BoltService {

   String getName();

   void execute(Tuple input ,OutputCollector collector) ;

   Logger getLog();
}

storm和spring的结合

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