idempotent-receiver-router does not allow custom object store in XML configuration

• User impact:

  Medium
• Effort points:

  0.5
• Affects Docs:

  Yes
• Similar Issues:

  None

Currently, the idempotent-receiver-router XML element allows only a fixed set of object stores to be configured: in-memory-store and simple-text-file-store. You cannot, however, configure a custom obejct store.

Allow the following config:

<idempotent-receiver-router idExpression="#[header:Message-Id]">
    <custom-object-store ref="xyz"/>
or
    <custom-object-store class="xyz"/>
<idempotent-receiver-router>

As workaround you can use the custom-inbound-router element and configure it though spring properties like this:

<custom-inbound-router class="org.mule.routing.inbound.IdempotentReceiver">
    <spring:property name="idExpression" value="#[header:Message-Id]"/>
    <spring:property name="store" ref="DatabaseObjectStore"/>
</custom-inbound-router>

(DatabaseObjectStore is a plain spring:bean in the config)