THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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MVEL
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Component
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Available
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as
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of
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Camel
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2.12
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The
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mvel:
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component
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allows
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you
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to
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process
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a
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message
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using
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an
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template.
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This
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can
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be
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ideal
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when
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using
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to
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generate
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responses
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for
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requests.
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Maven
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users
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will
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need
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to
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add
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the
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following
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dependency
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to
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their
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pom.xml
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for
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this
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component:
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{code:xml}
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-mvel</artifactId>
<version>x.x.x</version>
<!-- use the same version as your Camel core version -->
</dependency>
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URI format
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{code} h3. URI format {code} mvel:templateName[?options] {code} Where *templateName* is the |
Where templateName is the classpath-local
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URI
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of
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the
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template
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to
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invoke;
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or
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the
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complete
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URL
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of
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the
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remote
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template
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(eg:
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You
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can
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append
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query
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options
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to
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the
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URI
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in
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the
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following
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format,
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?option=value&option=value&...
Options
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}} h3. Options {div:class=confluenceTableSmall} || Option || Default || Description || | {{contentCache}} | {{true}} | Cache for the resource content when it is loaded. The cached resource content can be cleared via JMX using the endpoint's {{clearContentCache}} operation. | | {{encoding}} | {{null}} | Character encoding of the resource content. | {div} h3. |
Message
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Headers
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The
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mvel
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component
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sets
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a
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couple
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headers
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on
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the
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message.
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{div:class=confluenceTableSmall} || Header || Description || | {{CamelMvelResourceUri}} | The *templateName* as a {{String}} object. | {div} h3. |
MVEL
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Context
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Camel
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will
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provide
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exchange
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information
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in
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the
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MVEL
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context
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(just
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a
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Map
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).
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The
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Exchange
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is
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transfered
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as:
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{div:class=confluenceTableSmall} || key || value || | {{exchange}} | The {{Exchange}} itself. | | {{exchange.properties}} | The {{Exchange}} properties. | | {{headers}} | The headers of the In message. | | {{camelContext}} | The Camel Context intance. | | {{request}} | The In message. | | {{in}} | The In message. | | {{body}} | The In message body. | | {{out}} | The Out message (only for InOut message exchange pattern). | | {{response}} | The Out message (only for InOut message exchange pattern). | {div} h3. |
Hot
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reloading
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The
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mvel
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template
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resource
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is,
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by
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default,
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hot
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reloadable
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for
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both
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file
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and
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classpath
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resources
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(expanded
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jar).
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If
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you
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set
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contentCache=true
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,
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Camel
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will
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only
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load
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the
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resource
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once,
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and
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thus
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hot
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reloading
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is
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not
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possible.
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This
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scenario
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can
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be
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used
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in
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production,
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when
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the
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resource
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never
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changes.
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Dynamic
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templates
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Camel
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provides
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two
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headers
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by
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which
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you
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can
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define
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a
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different
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resource
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location
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for
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a
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template
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or
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the
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template
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content
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itself.
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If
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any
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of
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these
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headers
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is
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set
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then
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Camel
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uses
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this
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over
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the
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endpoint
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configured
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resource.
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This
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allows
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you
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to
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provide
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a
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dynamic
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template
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at
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runtime.
| Wiki Markup |
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{div:class=confluenceTableSmall}
|| Header || Type || Description ||
| CamelMvelResourceUri | String | A URI for the template resource to use instead of the endpoint configured. |
| CamelMvelTemplate | String | The template to use instead of the endpoint configured. |
{div} |
Samples
For example you could use something like
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h3. Samples For example you could use something like {code} from("activemq:My.Queue"). to("mvel:com/acme/MyResponse.mvel"); {code} |
To
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use
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a
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MVEL
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template
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to
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formulate
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a
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response
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to
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a
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message
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for
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InOut
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message
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exchanges
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(where
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there
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is
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a
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JMSReplyTo
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header).
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To
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specify
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what
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template
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the
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component
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should
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use
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dynamically
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via
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a
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header,
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so
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for
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example:
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} from("direct:in"). setHeader("CamelMvelResourceUri").constant("path/to/my/template.mvel"). to("mvel:dummy"); {code} |
To
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specify
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a
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template
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directly
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as
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a
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header
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the
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component
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should
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use
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dynamically
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via
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a
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header,
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so
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for
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example:
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} from("direct:in"). setHeader("CamelMvelTemplate").constant("@{\"The result is \" + request.body * 3}\" }"). to("velocity:dummy"); {code} {include:Endpoint See Also} |
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