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Merge pull request #214 from artembilan/INT-2273

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Mark Fisher
2011-12-02 14:14:23 -05:00
parent 801ba439be dec71f27c8
commit 8890d1b13e
1 changed files with 10 additions and 1 deletions
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11
docs/src/reference/docbook/channel-adapter.xml
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@@ -118,9 +118,18 @@
<para>
Any Channel Adapter can be created without a "channel" reference in which case it will implicitly create an
instance of <classname>DirectChannel</classname>. The created channel's name will match the "id" attribute
of the &lt;inbound-channel-adapter/&gt; or &lt;outbound-channel-adapter&gt; element. Therefore, if the "channel"
of the <code>&lt;inbound-channel-adapter&gt;</code> or <code>&lt;outbound-channel-adapter&gt;</code> element. Therefore, if the "channel"
is not provided, the "id" is required.
</para>
<para>
Like many other Spring Integration components, the <code>&lt;inbound-channel-adapter&gt;</code> and
<code>&lt;outbound-channel-adapter&gt;</code> also provide support for SpEL expression evaluation. To use SpEL, provide the
expression string via the 'expression' attribute instead of providing the 'ref' and 'method' attributes that are used for
method-invocation on a bean. When an Expression is evaluated, it follows the same contract as method-invocation where:
the <emphasis>expression</emphasis> for an <code>&lt;inbound-channel-adapter&gt;</code> will generate a message anytime the
evaluation result is a <emphasis>non-null</emphasis> value, while the <emphasis>expression</emphasis> for an
<code>&lt;outbound-channel-adapter&gt;</code> must be the equivalent of a <emphasis>void</emphasis> returning method invocation.
</para>
</section>
</section>