spring cloud 实践之hystrix注意事项

当我们写类似下面代码时

package demo1.demo1;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;

@RestController
public class TestRest {

    protected final static Logger logger = LoggerFactory.getLogger(TestRest.class);
    @HystrixCommand(commandProperties = {
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "20000") }, threadPoolProperties = {
                    @HystrixProperty(name = "coreSize", value = "64") }, threadPoolKey = "test1")
    @GetMapping("/testdemo1")
    public long getStringtest2() {
        logger.info("我收到了其他服务调用");
        // 返回当前时间毫秒 来发现访问变化
        
        return System.currentTimeMillis();
    }
    

}

如果方法之间有嵌套（注意不要像下面那样写）

package demo1.demo1;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;

@RestController
public class TestRest {

    protected final static Logger logger = LoggerFactory.getLogger(TestRest.class);
    @HystrixCommand(commandProperties = {
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "20000") }, threadPoolProperties = {
                    @HystrixProperty(name = "coreSize", value = "64") }, threadPoolKey = "test1")
    @GetMapping("/testdemo1")
    public long getStringtest2() {
        logger.info("我收到了其他服务调用");
        // 返回当前时间毫秒 来发现访问变化
        
        //报个异常试试
        //int a=1/0;
        test();
        
        return System.currentTimeMillis();
    }
    @HystrixCommand(commandProperties = {
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "20000") }, threadPoolProperties = {
                    @HystrixProperty(name = "coreSize", value = "64") }, threadPoolKey = "test1")
    private void test(){
        //code
        
    }

}

因为使用了@HystrixCommand注解之后方法会放到隔离线程池中执行已经不再是tomcat或jetty等容器创建的web http线程池执行方法了，如果有两个可能会占用两个被隔离的线程执行方法。