java - how to quit spring app during startup if certain condition meet? -

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i have spring app listens on rabbitmq , processing message, when app runs, register on hub database note 1 instance running, during registering if instance running, need quit app without init rabbit connection/queue , listener, otherwise message wrongly consumed. how that, know there callback when init bean. should create bean , before init it, checking whether instance running, how make sure bean init before other beans? need init database source bean before checking bean, otherwise can't use database defined in configuration.

 <rabbit:connection-factory id="connectionfactory" host="localhost" username="guest" password="guest" />     <rabbit:admin  id="containeradmin"  connection-factory="connectionfactory" />     <rabbit:queue id="etlqueue" name="etlqueue" />     <rabbit:direct-exchange id="myexchange" name="etl">         <rabbit:bindings>             <!--if doens't specifiy key here, default key same queue name, , need send message correct key,              otherwise listener can't receive mssage-->             <rabbit:binding queue="etlqueue" key="etlqueue" />         </rabbit:bindings>     </rabbit:direct-exchange>      <bean id="alistener" class="com.testcom.amqp.listener.connectorlistener" c:datasource-ref="datasource"/>      <!--concurrency set how many threads running concurrently consume messsage, code need thread safe-->     <rabbit:listener-container id="mylistenercontainer" connection-factory="connectionfactory" prefetch="1" concurrency="10">         <rabbit:listener ref="alistener" queues="etlqueue" />     </rabbit:listener-container>

as using xml configuration, attribute depends-on helps bean should not initialized before target bean :

<bean id="a" .../> <bean id="b" ... depends-on="a"/>

bean b should initialized after (unless there cyclic dependency in case spring best ...)


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