SpringDataMongoDB多文档事务的实现

一、安装MongoDB4.0.3（××）

1.1、官方安装文档

https://docs.mongodb.com/manual/tutorial/install-mongodb-on-red-hat/

1.2、tar.gz包下载地址

https://www.mongodb.com/download-center/community?jmp=docs

1.3、复制集官方配置

https://docs.mongodb.com/manual/administration/replica-set-member-configuration/

二、SpringProject版本依赖（×）

Spring：5.1.1.RELEASE 以上

SpringDataMongoDB:2.1.1.RELEASE 以上

三、配置MongoTransactionManager（SpringBoot使用方式）

SpringBoot 集成非常简单，配置MongoTransastionManager，目前Spring-boot-starter-data-mongodb 版本较低不支持，因此暂未验证，SpringBoot配置复制集参考SpringBoot相关文档

@Configuration
static class Config extends AbstractMongoConfiguration {

  @Bean
  MongoTransactionManager transactionManager(MongoDbFactory dbFactory) {
    return new MongoTransactionManager(dbFactory);
  }

  // ...
}

四、配置MongoTransactionManager（普通Spring项目）

  <context:property-placeholder location="classpath:mongo.properties" ignore-unresolvable="true"
    file-encoding="utf-8" />

  <!--
    重点配置
    1.安全配置：credentials="${mongo.user}:${mongo.password}@${mongo.database}"
    2.单机配置：host="${mongo.host}" port="${mongo.port}"
    3.副本集配置：replica-set="${mongo.replSet}"
  -->
  <mongo:mongo-client id="mongoClient" replica-set="${mongo.replSet}">
    <mongo:client-options min-connections-per-host="${mongo.minConnectionsPerHost}"
      write-concern="SAFE"
      read-preference="NEAREST"
      threads-allowed-to-block-for-connection-multiplier="${mongo.threadsAllowedToBlockForConnectionMultiplier}"
      connect-timeout="${mongo.connectTimeout}" max-wait-time="${mongo.maxWaitTime}"
      socket-keep-alive="${mongo.socketKeepAlive}" socket-timeout="${mongo.socketTimeout}"
      max-connection-idle-time="${mongo.maxConnectionIdleTime}"
      max-connection-life-time="${mongo.maxConnectionLifeTime}"
      heartbeat-socket-timeout="${mongo.heartbeatSocketTimeout}"
      heartbeat-connect-timeout="${mongo.heartbeatConnectTimeout}"
      min-heartbeat-frequency="${mongo.minHeartbeatFrequency}"
      heartbeat-frequency="${mongo.heartbeatFrequency}" />
  </mongo:mongo-client>

  <mongo:db-factory id="mongoDbFactory" dbname="${mongo.database}"
    mongo-ref="mongoClient" />

  <bean id="mappingContext"
    class="org.springframework.data.mongodb.core.mapping.MongoMappingContext" />

  <bean id="defaultMongoTypeMapper"
    class="org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper">
    <constructor-arg name="typeKey">
      <null />
    </constructor-arg>
  </bean>

  <bean id="mappingMongoConverter"
    class="org.springframework.data.mongodb.core.convert.MappingMongoConverter">
    <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
    <constructor-arg name="mappingContext" ref="mappingContext" />
    <property name="typeMapper" ref="defaultMongoTypeMapper" />
  </bean>

  <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
    <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
    <constructor-arg name="mongoConverter" ref="mappingMongoConverter" />
  </bean>

  <!-- 重点配置 -->

  <bean id="mongoTransactionManager" class="org.springframework.data.mongodb.MongoTransactionManager">
    <constructor-arg name="dbFactory" ref="mongoDbFactory"/>
  </bean>

  <tx:annotation-driven transaction-manager="mongoTransactionManager" proxy-target-class="true"/>

五、使用事务（×）

@Service
public class StateService {

  @Autowired
  private MongoTemplate teplate;

  @Transactional
  void someBusinessFunction(Step step) {
    template.insert(step);
    log.debug(1/0);
  };
});

六、Mongo.properties 配置

mongo.host=192.168.1.66
mongo.port=27017
mongo.replSet=192.168.1.66:2000,192.168.1.66:2001,192.168.1.66:2002
mongo.minConnectionsPerHost=10
mongo.threadsAllowedToBlockForConnectionMultiplier=4
mongo.connectTimeout=30000
mongo.maxWaitTime=3000
mongo.socketKeepAlive=false
mongo.socketTimeout=30000
mongo.maxConnectionIdleTime=0
mongo.maxConnectionLifeTime=0
mongo.heartbeatSocketTimeout=20000
mongo.heartbeatConnectTimeout=10000
mongo.minHeartbeatFrequency=3000
mongo.heartbeatFrequency=5000
mongo.database=labsta

七、最后是重点（×××××）

7.1、必须使用复制集，单节点不支持，mongodb4.2 会支持分片集事务，复制集安装请自行研究
7.2、使用事务之前（@Transaction），数据库和文档必须提前创建，如何解决呢？且看下篇
7.3、Spring版本和SpringDataMongodb版本必须遵循 @SpringProject版本依赖
7.4、注意，此处的复制集不是4.0版本之前的主从复制集群，4.0之后已废弃主从模式

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