四十三、使用线程池与CountDownLatch完成多线程阻塞

不念不忘少年蓝@ 2022-05-17 09:44 252阅读 0赞

\#          使用线程池与CountDownLatch完成多线程阻塞

这篇文章主要是将主线程阻塞，让子线程先跑。

\#\#\#1、添加Spring配置文件

<?xml version="1.0" encoding="UTF-8"?>  
    <beans xmlns="http://www.springframework.org/schema/beans"  
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"  
        xmlns:context="http://www.springframework.org/schema/context"  
        xsi:schemaLocation="http://www.springframework.org/schema/beans    
                            http://www.springframework.org/schema/beans/spring-beans-4.0.xsd    
                            http://www.springframework.org/schema/context    
                            http://www.springframework.org/schema/context/spring-context-4.0.xsd"> 
    
       <context:annotation-config /> 
    
       <context:component-scan base-package="com.xxxx" /> 
    
       
       <bean id="taskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
             
            <property name="corePoolSize" value="5" />
            
            <property name="maxPoolSize" value="10" />
            
            <property name="queueCapacity" value="25" />
            
            <property name="keepAliveSeconds" value="3000" />
            
            <property name="rejectedExecutionHandler">
                <bean class="java.util.concurrent.ThreadPoolExecutor$CallerRunsPolicy" />
            </property>
        </bean>
     </beans>

\#\#\#2、线程需要调用的业务类

public class TestShow {
    
       java.text.SimpleDateFormat dateTimeFormat = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
       public void start(String result){
           System.out.println("现在的时间为："+dateTimeFormat.format(new Date())+"    "+result);
    
       }
    }

\#\#\#3、实现runnable接口，调用业务类

private class TaskThread implements Runnable{
    		
    		private CountDownLatch latch;
    		java.text.SimpleDateFormat dateTimeFormat = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    		private String result;
    		private TaskThread(String result,CountDownLatch latch){
    			super();
    			this.result=result;
    			this.latch=latch;
    		}
    		
    		@Override
    		public void run() {
    			try{
    				 for(int i=0;i<10000;i++){
    					// dateTimeFormat.format(new Date());
    				  }
    			  System.out.println("现在的时间为："+dateTimeFormat.format(new Date())+"    "+result);
    			 
    			}catch(Exception e){
    				e.printStackTrace();
    			}finally{
    				if(this.latch!=null){
    					latch.countDown();
    				}
    			}
    			
    		}
    		
    	}

\#\#\#4、封装线程池及接口类

@Component
    public class ThreadRunnable {
    
    	@Autowired
    	private TaskExecutor taskExecutor;
    	
    	public void executeThread(String result,CountDownLatch latch){
    	
    		this.taskExecutor.execute(new TaskThread(result,latch));
    	}
    }

\#\#\#5、测试类

package threadPoolTaskExecutor;
    
    import java.util.concurrent.CountDownLatch;
    
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.test.context.ContextConfiguration;
    import org.springframework.test.context.junit4.AbstractJUnit4SpringContextTests;
    import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    
    import com.xxxx.thread.ThreadRunnable;
    
    @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration(locations = "classpath*:spring.xml")
    public class ThreadRunnableTest extends AbstractJUnit4SpringContextTests{
      
    	@Autowired
    	ThreadRunnable threadRunnable;
    	
    	@Test
    	public void test() throws InterruptedException{
    		CountDownLatch latch=new CountDownLatch(12);
    		for(int i=0;i<11;i++){	
    			threadRunnable.executeThread("走在大数据的边缘",latch);
    		}
    		//等待到latch=0才执行
    		latch.await();
    		System.out.println("执行完毕了吗！");
    	}
    }

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