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Added note on channel configuration within annotations - specifically pointed out that the inputChannel must be a SubscribableChannel in such a case

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Mark Fisher
2008-11-26 06:10:16 +00:00
parent 2e3a0487e0
commit a2ebf9fea5
1 changed files with 11 additions and 0 deletions
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11
spring-integration-reference/src/configuration.xml
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@@ -252,6 +252,17 @@ public class FooService {
location (and besides the XML configuration is not very verbose). If you do prefer to provide channels with the
annotations however, you just need to enable a BeanPostProcessor. The following element should be added:
<programlisting language="xml"><![CDATA[ <annotation-config/> ]]></programlisting>
<note>
When configuring the "inputChannel" and "outputChannel" with annotations, the "inputChannel"
<emphasis>must</emphasis> be a reference to a <interfacename>SubscribableChannel</interfacename> instance.
Otherwise, it would be necessary to also provide the full poller configuration via annotations, and those
settings (e.g. the trigger for scheduling the poller) should be externalized rather than hard-coded within
an annotation. If the input channel that you want to receive Messages from is indeed a
<interfacename>PollableChannel</interfacename> instance, one option to consider is the Messaging Bridge.
Spring Integration's "bridge" element can be used to connect a PollableChannel directly to a
SubscribableChannel. Then, the polling metadata is externally configured, but the annotation option is still
available. For more detail see <xref linkend="bridge"/>.
</note>
</para>
</section>