spring cloud rabbitmq 消息总线 使用示例

        
            org.springframework.cloud
            spring-cloud-starter-bus-amqp
        

package com.boot.merchant.restapi.mqchannel;

import org.springframework.cloud.stream.annotation.Output;
import org.springframework.messaging.MessageChannel;

public interface OutputSource {
    String ORDERSCHANNEL = "orderschannel";

    @Output("orderschannel")
    MessageChannel ordersOutput();
}

package com.boot.merchant.restapi.controller;

import com.boot.merchant.domain.entity.Order;
import com.boot.merchant.domain.entity.OrderDetail;
import com.boot.merchant.domain.service.OrderService;
import com.boot.merchant.domain.util.CommonUtils;
import com.boot.merchant.domain.util.CopyUtil;
import com.boot.merchant.object.OrderQo;
import com.boot.merchant.restapi.mqchannel.OutputSource;
import com.google.gson.Gson;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.annotation.Output;
import org.springframework.data.domain.Page;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.web.bind.annotation.*;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletableFuture;

@RestController
@RequestMapping("/order")
@EnableBinding(OutputSource.class)
public class OrderRestController {
    private static Logger logger = LoggerFactory.getLogger(OrderRestController.class);

    @Autowired
    private OrderService orderService;

    @Autowired
    @Output(OutputSource.ORDERSCHANNEL)
    private MessageChannel ordersChannel;

    @RequestMapping(method = RequestMethod.PUT)
    public CompletableFuture update(@RequestBody OrderQo orderQo) throws Exception{
        return CompletableFuture.supplyAsync(() -> {
            Order order = CopyUtil.copy(orderQo, Order.class);
            order.setModify(new Date());

            List detailList = CopyUtil.copyList(orderQo.getOrderDetails(), OrderDetail.class);
            order.setOrderDetails(detailList);

            orderService.save(order);

            //发送MQ消息，通知订单修改
            ordersChannel.send(MessageBuilder.withPayload(orderQo).build());

            logger.info("修改->ID=" + order.getId());
            return order.getId().toString();
        });
    }

}

package com.demo.goods.restapi.mqchannel;

import org.springframework.cloud.stream.annotation.Input;
import org.springframework.cloud.stream.annotation.Output;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.SubscribableChannel;

public interface InputSource {
    String ORDERSCHANNEL = "orderschannel";
    String REPLYCHANNEL = "replychannel";

    @Input("orderschannel")
    SubscribableChannel ordersInput();

    @Output("replychannel")
    MessageChannel replyOutput();
}

package com.demo.goods.restapi.service;

import com.demo.goods.domain.entity.Goods;
import com.demo.goods.domain.service.GoodsService;
import com.demo.goods.restapi.mqchannel.InputSource;
import com.demo.order.object.OrderDetailQo;
import com.demo.order.object.OrderQo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.integration.annotation.ServiceActivator;

import java.util.List;
import java.util.concurrent.CompletableFuture;

@EnableBinding(InputSource.class)
public class OrdersReceive {
    private static Logger logger = LoggerFactory.getLogger(OrdersReceive.class);
    @Autowired
    private GoodsService goodsService;

    @ServiceActivator(inputChannel = InputSource.ORDERSCHANNEL, outputChannel = InputSource.REPLYCHANNEL)
    public CompletableFuture accept(OrderQo orderQo) {
        return CompletableFuture.supplyAsync(() -> {
            if(orderQo != null) {
                logger.info("接收到订单更新消息，订单编号=" + orderQo.getOrderNo());

                if (orderQo.getStatus() != null && orderQo.getStatus() < 0) {
                    List list = orderQo.getOrderDetails();
                    for (OrderDetailQo orderDetailQo : list) {
                        Goods goods = goodsService.findOne(orderDetailQo.getGoodsid());
                        if(goods != null){
                            Integer num  = goods.getBuynum() != null && goods.getBuynum() >0?
                                    goods.getBuynum() - 1 : 0;
                            goods.setBuynum(num);
                            goodsService.save(goods);
                            logger.info("更新了商品购买数量，商品名称=" + goods.getName());
                        }
                    }
                }
            }
            return "1";
        });
    }
}