How to set MongoDB ReadPreference in Spring MVC's contextConfigLocation

Question

I am connecting to a MongoDB sharding server via mongodb java driver in Spring MVC. I am using the following versions:

• spring-webmvc-3.2.1.RELEASE
• mongo-java-driver/2.10.0/mongo-java-driver-2.10.0
• spring-data-mongodb-1.2.0.RELEASE

My Mongo options are set in the contextConfigLocation file mvc-dispatcher-servlet.xml

<mongo:mongo host="mongo.sample.com" port="30000">
     <mongo:options auto-connect-retry="true"
                    slave-ok="true"/>
</mongo:mongo>

It works pretty well, but the slave-ok is deprecated by come.MongoDB.ReadPreference. I just wonder if there is any way to set the readPreference for Spring MVC in the contextConfiLocation file.

Answer 1

Declare the following bean

<bean id="readPreferenceSecondary" class="com.mongodb.TaggableReadPreference.SecondaryReadPreference">
</bean>

and

you inject this in your mongotemplate

<bean id="mongoTemplateProdDb" class="org.springframework.data.mongodb.core.MongoTemplate" >
        <property name="readPreference" ref="readPreferenceSecondary"></property>
</bean>