Scripting LanguagesCamel supports a number of scripting languages which can be used to create an Expression or Predicate via the standard JSR 223 which is a standard part of Java 6. The following scripting languages are integrated into the DSL: However any JSR 223 scripting language can be used using the generic DSL methods. ScriptContextThe JSR-223 scripting languages ScriptContext is pre configured with the following attributes all set at ENGINE_SCOPE:
AttributesYou can add your own attributes with the attribute(name, value) DSL method, such as: In the sample below we add an attribute user that is an object we already have instantiated as myUser. This object has a getFirstName() method that we want to set as header on the message. We use the groovy language to concat the first and last name into a single string that is returned. from("direct:in").setHeader("name").groovy("'$user.firstName $user.lastName'").attribute("user", myUser").to("seda:users"); Any scripting languageCamel can run any JSR-223 scripting languages using the script DSL method such as: from("direct:in").setHeader("firstName").script("jaskel", "user.firstName").attribute("user", myUser").to("seda:users"); This is a bit different using the Spring DSL where you use the expression element that doesn't support setting attributes (yet):
<from uri="direct:in"/>
<setHeader headerName="firstName">
<expression language="jaskel">user.firstName</expression>
</setHeader>
<to uri="seda:users"/>
DependenciesTo use scripting languages in your camel routes you need to add the a dependency on camel-script which integrates the JSR-223 scripting engine. If you use maven you could just add the following to your pom.xml, substituting the version number for the latest & greatest release (see the download page for the latest versions). <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-script</artifactId> <version>1.4.0</version> </dependency> See Also |