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INT-1111, documented the change

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Oleg Zhurakousky
2010-05-03 22:13:19 +00:00
parent 8c2c2ca416
commit bd0cd1ff03
1 changed files with 22 additions and 0 deletions
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spring-integration-reference/src/gateway.xml
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@@ -76,6 +76,28 @@
<si:method name="echoViaDefault"/>
</si:gateway>]]></programlisting>
</para>
<para>
You can also provide individual headers per method invocation via XML.
This could be very useful if headers you want to set are static in nature and you don't want
to embed them in the gateway's method signature via <classname>@Header</classname> annotation.
For example; in the Loan Broker example we want to influence how aggregation of the Loan quotes
will be done based on what type of request was initiated (single quote or all quotes). Determining the
type of the request by evaluating what gateway's method was invoked, although possible would
violate the separation of concerns paradigm (method is a java artifact),  but expressing your
intention (meta information) via Message headers is natural to Messaging architecture.
<programlisting language="xml"><![CDATA[<int:gateway id="loanBrokerGateway"
service-interface="org.springframework.integration.loanbroker.LoanBrokerGateway">
<int:method name="getLoanQuote" request-channel="loanBrokerPreProcessingChannel">
<int:header name="RESPONSE_TYPE" value="BEST"/>
</int:method>
<int:method name="getAllLoanQuotes" request-channel="loanBrokerPreProcessingChannel">
<int:header name="RESPONSE_TYPE" value="ALL"/>
</int:method>
</int:gateway>]]></programlisting>
In the above case you can clearly see how a different header value will be set for the 'RESPONSE_TYPE'
header based on the gateway's method.
</para>
</section>
</chapter>