Dependency Injection: Jetty 7
- by Malax
Hi StackOverflow!
My application requires several interface implementations which require a Jetty server to do their job. This is, however, not necessarily the case in every implementations of those interfaces so the Jetty server is only a dependency.
Since it would be a huge amount of pain to wrap the entire jetty server with all its logging, connector and Handler configurations, I want to inject the server to those implementations with Spring. I decided that injecting the Server class is not a good idea because an implementation could stop the server even if its required at another location. Currently I inject empty HandlerList classes to those implementations and they register their handlers to avoid those problems.
The Problem: Those handlers might interfere with other handlers for example: implementation one might register a handler for /foo and implementation two too... problem. Has anyone used Jetty in such an environment? And how could this problem be solved?
My XML to clarify my problem:
<bean id="jetty" class="org.eclipse.jetty.server.Server" destroy-method="stop">
<property name="connectors">
<list>
<bean class="org.eclipse.jetty.server.bio.SocketConnector">
<property name="host" value="10.8.0.46" />
<property name="port" value="9999" />
</bean>
</list>
</property>
<property name="handler">
<bean class="org.eclipse.jetty.server.handler.HandlerCollection">
<property name="handlers">
<list>
<ref bean="jetty.handlerList" />
<bean class="org.eclipse.jetty.server.handler.RequestLogHandler">
<property name="requestLog">
<bean class="org.eclipse.jetty.server.NCSARequestLog">
<constructor-arg value="${jetty.logfile}" />
<property name="extended" value="false"/>
</bean>
</property>
</bean>
</list>
</property>
</bean>
</property>
<property name="sendServerVersion" value="false" />
</bean>
<bean id="jetty.handlerList" class="org.eclipse.jetty.server.handler.HandlerList" />
If I require an empty HandlerList I use something like this where com.example.myapp.util.ioc.CreateHandlerListFactory is a org.springframework.beans.factory.FactoryBean which creates a new HandlerList within the given HandlerList.
<constructor-arg>
<bean class="com.example.myapp.util.ioc.CreateHandlerListFactory">
<constructor-arg ref="jetty.handlerList"/>
</bean>
</constructor-arg>
