JavaScript DSL

JVM since1.8.0 Native since1.8.0

An JavaScript stack for parsing JavaScript route definitions

What’s inside

Please refer to the above link for usage and configuration details.

Maven coordinates

<dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifactId>camel-quarkus-js-dsl</artifactId>
</dependency>

Check the User guide for more information about writing Camel Quarkus applications.

Camel Quarkus limitations

Since the function Java.extend is only available in JVM mode, by default, there is no way to implement a functional interface like a Camel Processor in JavaScript that is supported by the native compilation.

As workaround, an implementation of the main functional interfaces (org.apache.camel.Processor, java.util.function.Consumer, java.util.function.Supplier, java.util.function.Function, java.util.function.Predicate, java.util.function.BiConsumer, java.util.function.BiFunction and java.util.function.BiPredicate) is available in the package org.apache.camel.quarkus.dsl.js.runtime whose simple name is prefixed by JavaScriptDsl. For each implementation, the body of the method to implement must be provided to the constructor. When the method to implement has arguments, the name of the arguments can also be provided to the constructor if the default names are not good enough.

So for example, to implement a Camel Processor instead of using the function Java.extend which is only available in JVM mode as next:

const Processor = Java.type("org.apache.camel.Processor"); (1)
const p = Java.extend(Processor); (2)
const a = new p(e => { e.getMessage().setBody('Some Content') }); (3)

from('direct:a')
    .process(a); (4)
1 Retrieve the class org.apache.camel.Processor
2 Create a new class that implements the functional interface org.apache.camel.Processor
3 Instantiate the new class with a function as argument representing the implementation of the method to implement
4 Provide the processor to the route definition.

To have a code compatible with the both modes, it is possible to instantiate directly the implementation of the corresponding functional interface which is in this case the class org.apache.camel.quarkus.dsl.js.runtime.JavaScriptDslProcessor as next:

const Processor = Java.type("org.apache.camel.quarkus.dsl.js.runtime.JavaScriptDslProcessor"); (1)
const p = new Processor("e", `e.getMessage().setBody('Some Content')`); (2)

from('direct:a')
    .process(p); (3)
1 Retrieve the class org.apache.camel.quarkus.dsl.js.runtime.JavaScriptDslProcessor
2 Instantiate the dedicated class with the name of the argument e as first parameter and the body of the function as second parameter representing the implementation of the method to implement
3 Provide the processor to the route definition.
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