Language
Available as of Camel
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2.5
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The
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language
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component
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allows
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you
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to
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send
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...
to
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an
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endpoint
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which
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executes
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a
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script
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by
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any
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of
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the
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supported
...
...
in
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Camel.
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By
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having
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a
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component
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to
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execute
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language
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scripts,
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it
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allows
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more
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dynamic
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routing
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capabilities.
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For
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example
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by
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using
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the
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...
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or
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...
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EIPs
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you
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can
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send
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messages
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to
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language
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endpoints
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where
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the
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script
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is
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dynamic
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defined
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as
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well.
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This
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component
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is
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provided
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out
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of
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the
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box
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in
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camel-core
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and
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hence
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no
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additional
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JARs
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is
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needed.
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You
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only
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have
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to
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include
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additional
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Camel
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components
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if
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the
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language
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of
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choice
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mandates
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it,
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such
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as
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using
...
...
or
...
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languages.
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URI
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format
| Code Block |
|---|
{code} language://languageName[:script][?options] {code} |
And
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from
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Camel
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2.11
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onwards
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you
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can
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refer
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to
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an
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external
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resource
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for
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the
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script
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using
...
same
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notation
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as
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supported
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by
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the
...
other
...
...
s
...
in
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Camel
| Code Block |
|---|
} language://languageName:resource:scheme:location][?options] {code} h3. URI Options The component supports the following options. {div:class=confluenceTableSmall} || Name || Default Value || Type || Description || | {{languageName}} | {{null}} | {{String}} | The name of the [Language|Languages] to use, such as {{simple}}, {{groovy}}, {{javascript}} etc. This option is mandatory. | | {{script}} | {{null}} | {{String}} | The script to execute. | | {{transform}} | {{true}} | {{boolean}} | Whether or not the result of the script should be used as the new message body. By setting to {{false}} the script is executed but the result of the script is discarded. | | {{contentCache}} | {{true}} | {{boolean}} | *Camel 2.9:* Whether to cache the script if loaded from a resource. Note: from *Camel 2.10.3* a cached script can be forced to reload at runtime via JMX using the clearContentCache operation. | {div} h3. Message Headers The following message headers can be used to affect the behavior of the component {div:class=confluenceTableSmall} || Header || Description || | {{CamelLanguageScript}} | The script to execute provided in the header. Takes precedence over script configured on the endpoint. | {div} h3. Examples For example you can use the [Simple] language to [Message Translator] a message: |
URI Options
The component supports the following options.
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Message Headers
The following message headers can be used to affect the behavior of the component
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Examples
For example you can use the Simple language to Message Translator a message:
| Wiki Markup |
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{snippet:id=e1|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/language/LanguageRouteTest.java} |
...
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case
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you
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want
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to
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convert
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the
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message
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body
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type
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you
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can
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do
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this
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as
...
well:
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| Wiki Markup |
|---|
{snippet:id=e1|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/language/LanguageRouteConvertBodyTest.java} |
...
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can
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also
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use
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the
...
...
language,
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such
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as
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this
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example
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where
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the
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input
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message
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will
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by
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multiplied
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with
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2:
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| Wiki Markup |
|---|
{snippet:id=e1|lang=java|url=camel/trunk/components/camel-groovy/src/test/java/org/apache/camel/language/groovy/LanguageGroovyRouteTest.java} |
...
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can
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also
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provide
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the
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script
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as
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a
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header
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as
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shown
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below.
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Here
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we
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use
...
...
language
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to
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extract
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the
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text
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from
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the
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<foo>
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tag.
| Code Block | ||||
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{code:java} Object out = producer.requestBodyAndHeader("language:xpath", "<foo>Hello World</foo>", Exchange.LANGUAGE_SCRIPT, "/foo/text()"); assertEquals("Hello World", out); {code} h3. Loading scripts from resources *Available as of Camel 2.9* You can specify a resource uri for a script to load in either the endpoint uri, or in the {{ |
Loading scripts from resources
Available as of Camel 2.9
You can specify a resource uri for a script to load in either the endpoint uri, or in the Exchange.LANGUAGE_SCRIPT
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header.
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The
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uri
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must
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start
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with
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one
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of
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the
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following
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schemes:
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file:,
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classpath:,
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or
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http:
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For
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example
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to
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load
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a
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script
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from
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the
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classpath:
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| Wiki Markup |
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{snippet:id=e1|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/language/LanguageLoadScriptFromClasspathTest.java} |
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default
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the
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script
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is
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loaded
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once
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and
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cached.
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However
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you
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can
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disable
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the
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contentCache
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option
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and
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have
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the
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script
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loaded
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on
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each
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evaluation.
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For
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example
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if
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the
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file
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myscript.txt
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is
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changed
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on
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disk,
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then
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the
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updated
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script
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is
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used:
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| Wiki Markup |
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{snippet:id=e1|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/language/LanguageLoadScriptFromFileUpdateTest.java} |
...
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Camel
...
2.11
...
onwards
...
you
...
can
...
refer
...
to
...
the
...
resource
...
similar
...
to
...
the
...
other
...
...
s
...
in
...
Camel
...
by
...
prefixing
...
with
...
"resource:"
...
as
...
shown
...
below:
...
| Wiki Markup |
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{snippet:id=e1|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/component/language/LanguageResourceLoadScriptFromClasspathTest.java} |
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