Dependency injection through Spring

Injecting dependencies for API V2

 <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <bean id="cassandraHostConfigurator" class="me.prettyprint.cassandra.service.CassandraHostConfigurator">
        <constructor-arg value="localhost:9170"/>
    </bean>

    <bean id="cluster" class="me.prettyprint.cassandra.service.ThriftCluster">
        <constructor-arg value="TestCluster"/>
        <constructor-arg ref="cassandraHostConfigurator"/>
    </bean>

    <bean id="consistencyLevelPolicy" class="me.prettyprint.cassandra.model.ConfigurableConsistencyLevel">
        <property name="defaultReadConsistencyLevel" value="ONE"/>
    </bean>

    <bean id="keyspaceOperator" class="me.prettyprint.hector.api.factory.HFactory" factory-method="createKeyspace">
        <constructor-arg value="Keyspace1"/>
        <constructor-arg ref="cluster"/>
        <constructor-arg ref="consistencyLevelPolicy"/>
    </bean>


    <bean id="simpleCassandraDao" class="me.prettyprint.cassandra.dao.SimpleCassandraDao">
        <property name="keyspace" ref="keyspaceOperator"/>
        <property name="columnFamilyName" value="Standard1"/>
    </bean>

</beans>

The cassandraHostConfigurator bean is created first. The contructor parameters can be used as well as <property name="...name..." value="...value..."/> to set up more properties. The keyspaceOperator receives in this case, a name, the cluster object and the consistencyLevelPolicy bean. This model assumes you have a DAO object but that is not a restriction.

Injecting dependencies for Templates

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-3.0.xsd">

  <bean id="hectorTemplate"
    class="me.prettyprint.cassandra.service.spring.HectorTemplateImpl"
    init-method="init">
    <property name="cluster">
      <bean class="me.prettyprint.cassandra.service.Cluster">
        <constructor-arg value="TestCluster" />
        <constructor-arg>
          <bean class="me.prettyprint.cassandra.service.CassandraHostConfigurator">
            <constructor-arg value="localhost:9170" />
          </bean>
        </constructor-arg>
      </bean>
    </property>
    <property name="keyspace" value="Keyspace1" />
    <property name="replicationStrategyClass" value="org.apache.cassandra.locator.SimpleStrategy" />
    <property name="replicationFactor" value="1" />
  </bean>
</beans>