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<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"

  xmlns:tx="http://www.springframework.org/schema/tx" 

  xmlns:aop="http://www.springframework.org/schema/aop"

  xsi:schemaLocation="http://www.springframework.org/schema/beans

                      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

                      http://www.springframework.org/schema/tx&nbsp;

                      http://www.springframework.org/schema/tx/spring-tx-3.0.xsd

                      http://www.springframework.org/schema/aop

                      http://www.springframework.org/schema/aop/spring-aop-3.0.xsd

                      http://www.springframework.org/schema/context

                      http://www.springframework.org/schema/context/spring-context-3.0.xsd">                     

  <!--

      Compose a CloudStack deployment with selected components here

  -->

  <bean id="databaseUpgradeChecker" />

  <bean id="management-server" class ="com.cloud.server.ManagementServerExtImpl" />

  <bean id="configuration-server" />

  <bean id="clusterManagerImpl" />

  <bean id="clusteredAgentManagerImpl" />

  <bean id="clusteredVirtualMachineManagerImpl" />

  <bean id="highAvailabilityManagerExtImpl" />

  <!- - bean id="bareMetalVmManagerImpl" / -->

  <bean id="userVmManagerImpl" />

  <bean id="consoleProxyManagerImpl" />

  <bean id="securityGroupManagerImpl2" />

  <bean id="premiumSecondaryStorageManagerImpl" />

  <bean id="randomlyIncreasingVMInstanceDaoImpl" /> 

  <!--

      Network Elements

  -->

  <bean id="Ovs">

    <property name="name" value="Ovs"/>

  </bean>

  <bean id="ExternalDhcpServer">

    <property name="name" value="ExternalDhcpServer"/>

  </bean>

  <bean id="BareMetal">

    <property name="name" value="BareMetal"/>

  </bean>

  <bean id="SecurityGroupProvider">

    <property name="name" value="SecurityGroupProvider"/>

  </bean>

  <bean id="VirtualRouter">

    <property name="name" value="VirtualRouter"/>

  </bean>

  <bean id="VpcVirtualRouter">

    <property name="name" value="VpcVirtualRouter"/>

  </bean>

  <bean id="NiciraNvp">

    <property name="name" value="NiciraNvp"/>

  </bean>

  ...

  ...

</beans> 

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Wiki Markup
*@Component*

@Local(value=ClusterDao.class)

public class ClusterDaoImpl extends GenericDaoBase<ClusterVO, Long> implements ClusterDao {
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&nbsp; &nbsp; protected final SearchBuilder<ClusterVO> PodSearch;

&nbsp; &nbsp; protected final SearchBuilder<ClusterVO> HyTypeWithoutGuidSearch;

&nbsp; &nbsp; protected final SearchBuilder<ClusterVO> AvailHyperSearch;

&nbsp; &nbsp; protected final SearchBuilder<ClusterVO> ZoneSearch;

&nbsp; &nbsp; protected final SearchBuilder<ClusterVO> ZoneHyTypeSearch;
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&nbsp; &nbsp; private static final String GET_POD_CLUSTER_MAP_PREFIX = "SELECT pod_id, id FROM cloud.cluster WHERE cluster.id IN( ";

&nbsp; &nbsp; private static final String GET_POD_CLUSTER_MAP_SUFFIX = " )";

&nbsp; &nbsp; *@Inject*

&nbsp; &nbsp; protected HostPodDao \_hostPodDao;
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&nbsp; &nbsp; public ClusterDaoImpl() {

&nbsp; &nbsp; &nbsp; &nbsp; super();\\

&nbsp; &nbsp; &nbsp; &nbsp; HyTypeWithoutGuidSearch = createSearchBuilder();

&nbsp; &nbsp; &nbsp; &nbsp; HyTypeWithoutGuidSearch.and("hypervisorType", HyTypeWithoutGuidSearch.entity().getHypervisorType(), SearchCriteria.Op.EQ);

&nbsp; &nbsp; &nbsp; &nbsp; HyTypeWithoutGuidSearch.and("guid", HyTypeWithoutGuidSearch.entity().getGuid(), SearchCriteria.Op.NULL);

&nbsp; &nbsp; &nbsp; &nbsp; HyTypeWithoutGuidSearch.done();\\

&nbsp; &nbsp; &nbsp; &nbsp; ZoneHyTypeSearch = createSearchBuilder();

&nbsp; &nbsp; &nbsp; &nbsp; ZoneHyTypeSearch.and("hypervisorType", ZoneHyTypeSearch.entity().getHypervisorType(), SearchCriteria.Op.EQ);

&nbsp; &nbsp; &nbsp; &nbsp; ZoneHyTypeSearch.and("dataCenterId", ZoneHyTypeSearch.entity().getDataCenterId(), SearchCriteria.Op.EQ);

&nbsp; &nbsp; &nbsp; &nbsp; ZoneHyTypeSearch.done();\\

&nbsp; &nbsp; &nbsp; &nbsp; PodSearch = createSearchBuilder();

&nbsp; &nbsp; &nbsp; &nbsp; PodSearch.and("pod", PodSearch.entity().getPodId(), SearchCriteria.Op.EQ);

&nbsp; &nbsp; &nbsp; &nbsp; PodSearch.and("name", PodSearch.entity().getName(), SearchCriteria.Op.EQ);

&nbsp; &nbsp; &nbsp; &nbsp; PodSearch.done();\\

&nbsp; &nbsp; &nbsp; &nbsp; ZoneSearch = createSearchBuilder();

&nbsp; &nbsp; &nbsp; &nbsp; ZoneSearch.and("dataCenterId", ZoneSearch.entity().getDataCenterId(), SearchCriteria.Op.EQ);

&nbsp; &nbsp; &nbsp; &nbsp; ZoneSearch.groupBy(ZoneSearch.entity().getHypervisorType());

&nbsp; &nbsp; &nbsp; &nbsp; ZoneSearch.done();\\

&nbsp; &nbsp; &nbsp; &nbsp; AvailHyperSearch = createSearchBuilder();

&nbsp; &nbsp; &nbsp; &nbsp; AvailHyperSearch.and("zoneId", AvailHyperSearch.entity().getDataCenterId(), SearchCriteria.Op.EQ);

&nbsp; &nbsp; &nbsp; &nbsp; AvailHyperSearch.select(null, Func.DISTINCT, AvailHyperSearch.entity().getHypervisorType());

&nbsp; &nbsp; &nbsp; &nbsp; AvailHyperSearch.done();

&nbsp; &nbsp; }

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} 
}&nbsp;

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}
\\

For most of low-level built-in components like DAOs, in Javelin practice, we use @Component annotation, since it saves us a lot of typing and can take advantage of Eclipse IDE's powerful refactoring and type-infer feature to help us coding. However, if you are developing high level components and you want to give flexibility for customer to choose to compose a particular CloudStack deployment, declare in componentContext.xml would be a better choice.

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