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While we are refactoring CloudStack architecture, to lay out a better component oriented foundation, be open to tools that most developers are familiar with in Java community, we started to experience the usage of Apache Spring Framework, switching to Spring touches a lot of existing CloudStack codebase, however, it does not bring any business logic changes, but it does introduce changes that CloudStack developers need to be aware of.
1. CloudStack Framework components and business logic components
With old component container managed by ComponentLocator class, we don't distinguish framework components and regular components that implement varios CloudStack business logic, we started to separate framework components and business logic components, there are separated context configuration file, these two files are applicationContext.xml.in and componentContext.xml.in, following is some sample content from Javelin
applicationContext.xml.in
<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 _
_ 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">
<context:annotation-config />
<context:component-scan base-package="org.apache.cloudstack, com.cloud" />
<!--
@DB support
-->
<aop:config proxy-target-class="true">
<aop:aspect id="dbContextBuilder" ref="transactionContextBuilder">
<aop:pointcut id="captureAnyMethod"
expression="execution(* *(..))"
/>
<aop:around pointcut-ref="captureAnyMethod" method="AroundAnyMethod"/>
</aop:aspect>
<aop:aspect id="actionEventInterceptorAspect" ref="actionEventInterceptor">
<aop:pointcut id="captureEventMethod"
expression="execution(* *(..)) and @annotation(com.cloud.event.ActionEvent)"
/>
<aop:around pointcut-ref="captureEventMethod" method="AroundAnyMethod"/>
</aop:aspect>
</aop:config>
<bean id="transactionContextBuilder" />
<bean id="actionEventInterceptor" />
<!--
RPC/Async/EventBus
-->
<bean id="onwireRegistry"
init-method="scan" >
<property name="packages">
<list>
<value>org.apache.cloudstack.framework</value>
</list>
</property>
</bean>
<bean id="messageSerializer">
<property name="onwireClassRegistry" ref="onwireRegistry" />
</bean>
<bean id="transportProvider" init-method="initialize">
<property name="workerPoolSize" value="5" />
<property name="nodeId" value="Node1" />
<property name="messageSerializer" ref="messageSerializer" />
</bean>
<bean id="rpcProvider" init-method="initialize">
<constructor-arg ref="transportProvider" />
<property name="messageSerializer" ref="messageSerializer" />
</bean>
<bean id="eventBus" class = "org.apache.cloudstack.framework.eventbus.EventBusBase" />
<bean id="apiServlet" class = "com.cloud.api.ApiServlet" />
</beans>
Components that offer framework level services are collected in applicationContext.xml.in, these framework components usually help define the runtime environment for all other business logic components, for example, middle-ware service components that are for inter-component communication, CloudStack Database, general DB transaction management etc. CloudStack customers may have various combination of activated business logic components in a particular setup, but most of time, a same set of framework components is usually used.
componentContext.xml.in
<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
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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