如何让处理器在Mule的入站端点中异步工作？

<flow name="asyncFlow">
    <http:listener config-ref="HTTP_Listener_Configuration" path="/async" doc:name="HTTP"/>
    <async doc:name="Async">
        <!-- 异步处理的处理器 -->
        <logger message="Processing message asynchronously" level="INFO" doc:name="Logger"/>
    </async>
</flow>

<configuration>
    <default-threading-profile maxThreadsActive="10" maxThreadsIdle="5" threadTTL="60000"/>
</configuration>

<async processingStrategy="customProcessingStrategy">
    <!-- 异步处理的处理器 -->
    <logger message="Processing message asynchronously" level="INFO" doc:name="Logger"/>
</async>