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HomeJavajavaTutorialWhat types of ShardingSphere's routing engines are there in Java development?

    ShardingSphere的路由引擎类型

    本篇文章源码基于4.0.1版本

    ShardingSphere在路由流程过程中,根据不同类型的SQL会现在不同的路由引擎,而ShardingSphere支持的路由规则也很多了,包括广播(broadcast)路由、混合(complex)路由、默认数据库(defaultdb)路由、无效(ignore)路由、标准(standard)路由以及单播(unicast)路由等等,那么具体这些路由规则对应的是什么路由引擎呢?今天我们就聊聊这个。

    路由引擎类型

    RoutingEngineFactory 用来创建路由引擎的实例,对应的是它的newInstance()方法,根据Sql语句SQLStatement对象的类型选择不同的路由引擎,有

    全库广播路由引擎DatabaseBroadcastRoutingEngine、

    全库表广播路由引擎TableBroadcastRoutingEngine、

    无效路由引擎IgnoreRoutingEngine、

    默认数据库路由引擎DefaultDatabaseRoutingEngine(对默认的数据库进行路由)、

    单播路由引擎UnicastRoutingEngine(单播路由只需要在任何数据库的任何表中获取就可以,相当于获取表中公有信息)、

    数据源组的广播路由引擎DataSourceGroupBroadcastRoutingEngine、

    数据库主库实例的广播路由引擎MasterInstanceBroadcastRoutingEngine(这个就是针对主库进行的操作,比如一些授权的SQL语句)

    笛卡尔路由引擎CartesianRoutingEngine、

    混合路由引擎ComplexRoutingEngine、

    标准路由引擎StandardRoutingEngine

    标准路由

    标准路由是ShardingSphere推荐使用的一种分片路由策略,在进行分片表只有一个或者分片表是绑定关系,这个绑定关系是在配置文件中定义的,比如如下配置:

    shardingRule:
      bindingTables: 
         table1,table2

    这个配置文件会解析成BindingTableRule集合,在进行判断绑定关系的时候根据逻辑表名获取BindingTableRule对象,判断是否在集合中,如果有就表明存在绑定关系

    路由逻辑

    路由逻辑在StandardRoutingEngine的route()中体现,具体逻辑是分两步走,先获取数据节点,在生成路由结果,获取路由接点对应StandardRoutingEngine的getDataNodes()方法:

        private Collection<DataNode> getDataNodes(final TableRule tableRule) {
            if (isRoutingByHint(tableRule)) {
                return routeByHint(tableRule);
            }
            if (isRoutingByShardingConditions(tableRule)) {
                return routeByShardingConditions(tableRule);
            }
            return routeByMixedConditions(tableRule);
        }
    • 如果是基于Hint的路由,具体就判断分片策略是否为HintShardingStrategy对象,调用routeByHint()方法

    • 如果是分片条件的路由,调用isRoutingByShardingConditions()方法

    • 否则就调用复合条件的路由

    这三种情况都会调用route0()方法,先进行数据源的路由,再进行表的路由,生成数据节点

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