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

来源：https://www.jianshu.com/p/2faf0e6b6627