daily/src/main/java/controller/ProductAction.java

package controller;

import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.recipes.locks.InterProcessMutex;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import service.ProductService;

@Controller
public class ProductAction {

    @Autowired
    private ProductService productService;

    private static String connectString = "192.168.48.128:2181,192.168.48.129:2181,192.168.48.130:2181";

    @GetMapping("/product/reduce")
    @ResponseBody
    public Object reduce(int id) throws Exception {
        RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000,3);

        CuratorFramework client = CuratorFrameworkFactory.newClient(connectString, retryPolicy);
        client.start();

        InterProcessMutex lock = new InterProcessMutex(client, "/product_"+id);
        try {
            lock.acquire();
            productService.reduceStock(id);
        } catch (Exception e) {
            if (e instanceof RuntimeException) {
                throw e;
            }
        } finally {
            lock.release();
        }
        return "ok";
    }
}