8 高併發解決方案

 8.1 高併發問題分析

 

 8.2 代碼實現

package xx.study.sc.command;

import com.netflix.hystrix.*;
import org.springframework.web.client.RestTemplate;
import xx.study.sc.model.Product;

public class OrderCommand extends HystrixCommand<Product> {

    private RestTemplate restTemplate;
    private Long id;

    public OrderCommand(RestTemplate restTemplate,Long id){
        super(setter());
        this.restTemplate=restTemplate;
        this.id=id;

    }
    private static Setter setter(){
        //服務分組
        HystrixCommandGroupKey groupKey=HystrixCommandGroupKey.Factory.asKey("order_product");
        //服務標識
        HystrixCommandKey commandKey=HystrixCommandKey.Factory.asKey("product");
        //線程池名稱
        HystrixThreadPoolKey threadPoolKey=HystrixThreadPoolKey.Factory.asKey("order_produt_pool");

        /**
         * 線程池配置
         * withCoreSize :線程池大小
         * withKeepAliveTimeMinutes:線程存活時間15s
         * withQueueSizeRejectionThreshold:隊列等待的閾值爲100，超過100執行拒絕策略
         */
        HystrixThreadPoolProperties.Setter threadPoolProperties=HystrixThreadPoolProperties.Setter().withCoreSize(50).
                withKeepAliveTimeMinutes(15).withQueueSizeRejectionThreshold(100);
        //命令屬性配置Hystrix開啓超時
        HystrixCommandProperties.Setter commandProperties=HystrixCommandProperties.Setter().
                //採用線程池隔離
                withExecutionIsolationStrategy(HystrixCommandProperties.ExecutionIsolationStrategy.THREAD)
                .withExecutionTimeoutEnabled(false);
        return Setter.withGroupKey(groupKey).andCommandKey(commandKey).andThreadPoolKey(threadPoolKey)
                .andThreadPoolPropertiesDefaults(threadPoolProperties).andCommandPropertiesDefaults(commandProperties);






    }


    @Override
    protected Product run() throws Exception {
        return restTemplate.getForObject("http://127.0.0.1:9000/product/buy",Product.class);
    }
}