private final OrderedAwareCopyOnWriteArraySet<MessageHandler> handlers =
        new OrderedAwareCopyOnWriteArraySet<MessageHandler>();

<xsd:attribute name="order" type="xsd:string">
        <xsd:annotation>
            <xsd:documentation><![CDATA[
Specifies the order for invocation when this endpoint is connected as a
subscriber to a channel. This is particularly relevant when that channel
is using a "failover" dispatching strategy. It has no effect when this
endpoint itself is a Polling Consumer for a channel with a queue.

                ]]></xsd:documentation>
        </xsd:annotation>
    </xsd:attribute>