spring-bus消息总线的使用

依赖

   <dependency>
      <groupId>org.springframework.cloudgroupId>
      <artifactId>spring-cloud-starter-bus-amqpartifactId>
    dependency>

bus应用

• 类似于生产者

接口

• 供内部其他应用使用,远程调用该接口实现各应用之间数据同步
• 参数1定义事件,参数2定义操作具体crud,参数3定义传参数据,参数4定义给哪个应用(nacos注册的应用名)同步数据

import cn.hutool.log.Log;
import cn.hutool.log.LogFactory;
import com.xyc.sms.common.bus.events.DataSyncEventEnum;
import com.xyc.sms.common.bus.events.DataSyncEventFactory;
import com.xyc.sms.common.bus.events.DataSyncOperateTypeEnum;
import com.xyc.sms.common.entity.Result;
import org.springframework.cloud.bus.ServiceMatcher;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;

/**
 * 数据同步通知事件控制器,该事件主要用于平台中常规的数据同步通知,
 * 需要用于其他功能请新增类
 * 需要增加同步的方式请在{@link DataSyncEventEnum}增加事件枚举
 * 同时在{@link com.xyc.sms.common.bus.events.dataSync}下增加事件类,新增的事件类需要继承{@link com.xyc.sms.common.bus.events.DataSyncEvent}
 */
@RestController
@RequestMapping("/default")
public class DataSyncNotifyEventController {

    private static final Log logger = LogFactory.get();

    @Resource
    private ServiceMatcher busServiceMatcher;
    @Resource
    private ApplicationEventPublisher applicationEventPublisher;

    /**
     * 发布数据同步通知事件
     *
     * @param eventEnum   事件枚举,可通过枚举找到对应的事件类
     * @param operateType 操作类型枚举
     * @param obj         需要处理的消息
     * @param destination 目的地,为null则是广播给所有该事件的监听器
     * @return 发布结果
     */
    @PostMapping("/publish/{eventEnum}/{operateType}")
    public Result publishDataSyncNotifyEvent(@PathVariable("eventEnum") DataSyncEventEnum eventEnum,
                                             @PathVariable("operateType") DataSyncOperateTypeEnum operateType,
                                             @RequestBody Object obj,
                                             @RequestParam(value = "destination", required = false) String destination) {
        try {
            applicationEventPublisher.publishEvent(DataSyncEventFactory.getInstanceForEvent(
                    eventEnum,
                    operateType,
                    obj,
                    busServiceMatcher.getServiceId(),
                    destination));
            return Result.returnSuccessWithMsg("success");
        } catch (Exception e) {
            logger.error(e);
            return Result.returnFail(e.getMessage());
        }
    }
}

• 事件工厂类

import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.Arrays;

public class DataSyncEventFactory {

    private static final ObjectMapper OM = new ObjectMapper();

    /**
     * 通过事件的类模板获取构造器并调用,生成事件的实体类
     *
     * @param operateType        操作类型
     * @param source             事件原数据
     * @param originService      原服务
     * @param destinationService 目标服务
     * @return 事件实体类
     * @throws NoSuchMethodException     通过类模板无法找到相应的构造方法所抛出的异常
     * @throws InvocationTargetException 构造器创建实例可能出现的调用目标异常
     * @throws InstantiationException    构造器创建实例可能出现的实例化异常
     * @throws IllegalAccessException    构造器创建实例可能出现的无法访问异常
     * @throws IOException               json转化出现IO的异常
     * @throws ClassNotFoundException    通过类名{@link DataSyncEventEnum#getEventClassName()}没有找到对应类
     */
    public static DataSyncEvent<?> getInstanceForEvent(DataSyncEventEnum eventEnum,
                                                       DataSyncOperateTypeEnum operateType,
                                                       Object source,
                                                       String originService,
                                                       String destinationService)
            throws NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException, IOException, ClassNotFoundException {
        Constructor<?>[] constructors = DataSyncEventFactory.getEventClass(eventEnum).getDeclaredConstructors();
        Constructor<?> constructor = Arrays.stream(constructors).filter(c -> c.getParameterCount() == 4).findFirst().orElseThrow(
                NoSuchMethodException::new);
        // 值转化
        Object o = OM.readValue(OM.writeValueAsString(source), constructor.getParameterTypes()[1]);
        return (DataSyncEvent<?>) constructor.newInstance(operateType, o, originService, destinationService);
    }

    private static Class<?> getEventClass(DataSyncEventEnum eventEnum) throws ClassNotFoundException {
        return Class.forName(eventEnum.getEventClassName());
    }
}

用到的封装参数类

• 定义各事件的枚举(只定义全类限定名称)

public enum DataSyncEventEnum {

    /**
     * 黑名单同步,参数为事件的类型名，注意需要使用全限定类名
     * @see com.xyc.sms.common.bus.events.dataSync.BlackListSyncEvent
     */
    BLACKLIST_SYN("com.xyc.sms.common.bus.events.dataSync.BlackListSyncEvent"),
    /**
     * 路由同步
     * @see com.xyc.sms.common.bus.events.dataSync.RouteSyncEvent
     */
    ROUTE_SYN("com.xyc.sms.common.bus.events.dataSync.RouteSyncEvent");

    /**
     * 事件类型名
     * @see DataSyncEvent 该抽象类的实现类
     */
    private final String eventClassName;

    DataSyncEventEnum(String eventClassName) {
        this.eventClassName = eventClassName;
    }

    public String getEventClassName() {
        return eventClassName;
    }
}

• 定义crud操作枚举

public enum DataSyncOperateTypeEnum implements Serializable {
    ADD, UPD, DEL
}

• 推送的事件类

/**
 * 数据同步通知事件,作为一般通用事件使用,如需要特殊处理建议新增事件
 */
public abstract class DataSyncEvent<T> extends RemoteApplicationEvent {

    /**
     * 事件数据
     */
    private DataSync<T> dataSync;

    public DataSync<T> getDataSync() {
        return dataSync;
    }

    public void setDataSync(DataSync<T> dataSync) {
        this.dataSync = dataSync;
    }

    /**
     * 基础构造器
     *
     * @param source             引发事件的原始数据
     * @param originService      引发事件的原始服务
     * @param destinationService 事件的目标服务
     */
    public DataSyncEvent(DataSync<T> source, String originService, String destinationService) {
        super(source, originService, destinationService);
        this.dataSync = source;
    }

    /**
     * 事件的日志打印,会在监听器监听到事件时输出打印
     * 结果尽可能不要有换行,保证日志输出在一行内
     * 该方法可以在子类中重写
     *
     * @return 日志
     */
    public String logPrint() {
        return String.format("{\"originService\":\"%s\",\"destinationService\":\"%s\",\"id\":\"%s\",\"dataSync\":%s,\"timestamp\":\"%s\"}", this.getId(), this.getOriginService(), this.getDestinationService(), Objects.nonNull(this.dataSync) ? this.dataSync.toString() : "null", this.getTimestamp());
    }

    /**
     * 数据同步的原始数据封装
     */
    public static class DataSync<T> implements Serializable {
        private DataSyncOperateTypeEnum operateType;
        private T data;

        public DataSync() {
        }

        public DataSync(DataSyncOperateTypeEnum operateType, T data) {
            this.operateType = operateType;
            this.data = data;
        }

        public DataSyncOperateTypeEnum getOperateType() {
            return operateType;
        }

        public T getData() {
            return data;
        }

        @Override
        public String toString() {
            return "{\"operateType\":" +
                    operateType
                    + ",\"data\":" +
                    data
                    + "}";
        }
    }
}

• 应用枚举

/**
 * 服务枚举
 */
public enum ServiceEnum {
    SMS_BLACK_API("sms-black-api"),
    SMS_RULES("sms-rules");

    public final String serviceName;

    ServiceEnum(String serviceName) {
        this.serviceName = serviceName;
    }
}

接收的应用

• 类似于消费者

监听器

• 推送过来的操作枚举类crud的值,决定执行哪个crud的具体方法
• 该类放在接收的应用中,其他顶部继承的类放在common包中即可

import cn.hutool.core.collection.CollectionUtil;
import cn.hutool.core.date.DateUtil;
import cn.hutool.log.Log;
import cn.hutool.log.LogFactory;
import com.xyc.sms.common.bus.DataSyncListener;
import com.xyc.sms.common.bus.events.dataSync.RouteSyncEvent;
import com.xyc.sms.common.entity.sms.Route;
import com.xyc.sms.rules.dao.boss.RouteMapper;
import com.xyc.sms.rules.data.RuleSymbol;
import com.xyc.sms.rules.service.SynService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Collectors;

/**
 * 路由同步通知监听器
 */
@Component
public class RouteSynNotifyListener extends DataSyncListener<RouteSyncEvent, List<Route>> {

    private static final Log log = LogFactory.get();

    @Autowired
    private RouteMapper routeMapper;

    @Autowired
    private SynService synService;

    @Override
    public void handleByADD(List<Route> data) {
        Optional.ofNullable(data).ifPresent(ls -> {
            if (ls.isEmpty()) {
                return;
            }

            long l = System.currentTimeMillis();

            String time = DateUtil.formatDateTime(ls.get(0).getCreateTime());
            List<Route> list = routeMapper.selectByCreatetime(time);
            if (CollectionUtil.isEmpty(list)) {
                return;
            }

            // 加载到内存中
            list.forEach(r -> RuleSymbol.RouteMap.put(r.getId(), r));
            synService.transformRoute(list, (s, r) -> RuleSymbol.RouteChannelMap.put(s, r));
            log.info("RouteSynNotifyListener - {} - add | createTime:{}", (System.currentTimeMillis() - l), time);
        });
    }

    @Override
    public void handleByUPD(List<Route> data) {
        // 流程还是先删除后新增的方式
        Optional.ofNullable(data).ifPresent(ls -> {
            List<Integer> collect = ls.stream()
                    .map(Route::getId)
                    .filter(Objects::nonNull)
                    .collect(Collectors.toList());
            if (collect.isEmpty()) {
                return;
            }

            long l = System.currentTimeMillis();

            // 如果有，先删除
            List<Route> c = collect.stream()
                    .map(RuleSymbol.RouteMap::get)
                    .filter(Objects::nonNull)
                    .collect(Collectors.toList());
            if (!c.isEmpty()) {
                synService.transformRoute(c, (s, r) -> RuleSymbol.RouteChannelMap.remove(s, r));
            }


            // 如果有，再加入
            List<Route> list = routeMapper.selectById(collect);
            if (!list.isEmpty()) {
                list.forEach(r -> RuleSymbol.RouteMap.put(r.getId(), r));
                synService.transformRoute(list, (s, r) -> RuleSymbol.RouteChannelMap.put(s, r));
            }
            log.info("RouteSynNotifyListener - {} - update | {}", (System.currentTimeMillis() - l), collect);
        });
    }

    @Override
    public void handleByDEL(List<Route> data) {
        Optional.ofNullable(data).ifPresent(ls -> {
            long l = System.currentTimeMillis();
            List<Route> collect = ls.stream()
                    .map(r -> RuleSymbol.RouteMap.remove(r.getId()))
                    .filter(Objects::nonNull)
                    .collect(Collectors.toList());

            if (collect.isEmpty()) {
                return;
            }
            synService.transformRoute(collect, (s, r) -> RuleSymbol.RouteChannelMap.remove(s));
            log.info("RouteSynNotifyListener - {} - remove", (System.currentTimeMillis() - l));
        });
    }
}

• 继承的抽象监听类

import cn.hutool.log.Log;
import cn.hutool.log.LogFactory;
import com.xyc.sms.common.bus.events.DataSyncEvent;
import org.springframework.context.ApplicationListener;

/**
 * 数据同步事件监听器
 * 需要具体的子类实现,并注册到spring容器中
 *
 * @param  数据同步件
 */
public abstract class DataSyncListener<T extends DataSyncEvent<D>, D> implements ApplicationListener<T> {

    private static final Log logger = LogFactory.get();

    @Override
    public void onApplicationEvent(T event) {
        logger.info("[DataSyncListener][onApplicationEvent] trigger event - {} - {}", event.getClass().getName(), event.logPrint());
        try {
            triggerEvent(event);
        } catch (Exception e) {
            logger.error(e);
        }
    }

    /**
     * 触发监听,处理事件
     *
     * @param event 事件
     */
    public void triggerEvent(T event) {
        DataSyncEvent.DataSync<D> source = event.getDataSync();
        switch (source.getOperateType()) {
            case ADD:
                handleByADD(source.getData());
                return;
            case UPD:
                handleByUPD(source.getData());
                return;
            case DEL:
                handleByDEL(source.getData());
                return;
            default:
        }
    }

    /**
     * 处理添加事件
     * 由子类实现
     *
     * @param data 需要处理的数据
     */
    public abstract void handleByADD(D data);

    /**
     * 处理修改事件
     * 由子类实现
     *
     * @param data 需要处理的数据
     */
    public abstract void handleByUPD(D data);

    /**
     * 处理删除事件
     * 由子类实现
     *
     * @param data 需要处理的数据
     */
    public abstract void handleByDEL(D data);
}

定义的事件类

• 上面封装的事件枚举所记录的是该类的全类限定名称

package com.xyc.sms.common.bus.events.dataSync;

import com.xyc.sms.common.bus.events.DataSyncEvent;
import com.xyc.sms.common.bus.events.DataSyncOperateTypeEnum;
import com.xyc.sms.common.entity.sms.Route;

import java.util.List;

public class RouteSyncEvent extends DataSyncEvent<List<Route>> {

    private static final long serialVersionUID = -501657066268464154L;

    public RouteSyncEvent(DataSyncOperateTypeEnum operateType, List<Route> Routes, String originService, String destinationService) {
        super(new DataSync<>(operateType, Routes), originService, destinationService);
    }
}

• 继承的抽象事件类

/**
 * 数据同步通知事件,作为一般通用事件使用,如需要特殊处理建议新增事件
 */
public abstract class DataSyncEvent<T> extends RemoteApplicationEvent {

    /**
     * 事件数据
     */
    private DataSync<T> dataSync;

    public DataSync<T> getDataSync() {
        return dataSync;
    }

    public void setDataSync(DataSync<T> dataSync) {
        this.dataSync = dataSync;
    }

    /**
     * 基础构造器
     *
     * @param source             引发事件的原始数据
     * @param originService      引发事件的原始服务
     * @param destinationService 事件的目标服务
     */
    public DataSyncEvent(DataSync<T> source, String originService, String destinationService) {
        super(source, originService, destinationService);
        this.dataSync = source;
    }

    /**
     * 事件的日志打印,会在监听器监听到事件时输出打印
     * 结果尽可能不要有换行,保证日志输出在一行内
     * 该方法可以在子类中重写
     *
     * @return 日志
     */
    public String logPrint() {
        return String.format("{\"originService\":\"%s\",\"destinationService\":\"%s\",\"id\":\"%s\",\"dataSync\":%s,\"timestamp\":\"%s\"}", this.getId(), this.getOriginService(), this.getDestinationService(), Objects.nonNull(this.dataSync) ? this.dataSync.toString() : "null", this.getTimestamp());
    }

    /**
     * 数据同步的原始数据封装
     */
    public static class DataSync<T> implements Serializable {
        private DataSyncOperateTypeEnum operateType;
        private T data;

        public DataSync() {
        }

        public DataSync(DataSyncOperateTypeEnum operateType, T data) {
            this.operateType = operateType;
            this.data = data;
        }

        public DataSyncOperateTypeEnum getOperateType() {
            return operateType;
        }

        public T getData() {
            return data;
        }

        @Override
        public String toString() {
            return "{\"operateType\":" +
                    operateType
                    + ",\"data\":" +
                    data
                    + "}";
        }
    }
}

使用bus

• 引用注入bus应用的接口远程调用

定义bus远程调用

@FeignClient(value="sms-bus", fallbackFactory = DataSyncNotifyEventServiceFallbackFactory.class)
public interface DataSyncNotifyEventService {

    /**
     * 发布数据同步通知事件
     * destination 参数被删除,不需要指定服务
     *
     * @param eventEnum   事件枚举,可通过枚举找到对应的事件类
     * @param operateType 操作类型枚举
     * @param obj         需要处理的消息
     * @return 发布结果
     */
    @PostMapping("/default/publish/{eventEnum}/{operateType}")
    Result publishDataSyncNotifyEvent(@PathVariable("eventEnum") DataSyncEventEnum eventEnum,
                                      @PathVariable("operateType") DataSyncOperateTypeEnum operateType,
                                      @RequestBody Object obj,
                                      @RequestParam("destination") String destination);
}

• 注入使用
  

A应用数据更新后通过bus数据同步给B应用

• 在A应用的业务层写以下代码

 try {
                result = dataSyncNotifyEventService.publishDataSyncNotifyEvent(DataSyncEventEnum.ROUTE_SYN,
                        DataSyncOperateTypeEnum.ADD,
                        new ArrayList<Route>() {{
                            Route r = new Route();
                            r.setCreateTime(date);
                            add(r);
                        }}, ServiceEnum.SMS_RULES.serviceName);
                log.info("新增路由调用通知同步所有服务 result:{}", result);
            } catch (Exception e) {
                log.error("同步异常 {}", result, e);
            }