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examples package: Using Gloop annotations in Groovy

It is important to document your services so other developers know their purpose and how they can be used. Groovy services can be called in Gloop, but comments in Groovy do not get carried over to the Gloop development environment (since they're not included in the resulting class file), and Groovy doesn't allow for as much metadata about a method and its parameters as Gloop does for a service and its inputs and outputs. To address this, Gloop has annotations that you can use to decorate your Groovy code, and add any required metadata for Gloop.

Invoking Groovy in Gloop

The examples package contains services that demonstrate how you can call Groovy in Gloop and vice versa.

The examples package includes gloopDocs.GloopDocsDemo.groovy, a Groovy class whose methods are annotated with Gloop annotations so that extra metadata about them are visible in Gloop. It shows the use of the following Gloop annotations:

Annotation Description
@GloopComment Use this annotation to add a method or class-wide comment.
@GloopParameter Use this annotation to document method parameters and return values in detail.
@GloopHide Use this to hide a public static Groovy method from Gloop.
@GloopObjectParameter Use this annotation to describe the structure of a Gloop model.

You can easily check that these annotations work by creating a new Gloop service and then dragging any of GloopDocsDemo.groovy's methods to it, thereby creating a new invoke step.

In the screenshot below, note how the comment for the method appears (1) after the invoke step and the tooltip. Also note how the parameter annotations appear (2) in the Mapper and the tooltip.

Gloop service using one of `GloopDocsDemo.groovy`'s methods

Gloop service using one of `GloopDocsDemo.groovy`'s methods

Related articles

Please see the following articles for more information:

Try it!

To double-check if the annotations work, create a new Gloop service and invoke the methods of GloopDocsDemo.groovy in that service by dragging and dropping GloopDocsDemo.groovy's methods from the Navigator view to the Gloop step editor1.

Invoking Groovy in Gloop

Invoking Groovy in Gloop

Can all Groovy methods be dragged and dropped?

As long as a Groovy method is public static and isn't annotated with @GloopHide, it can be dragged and dropped from the Navigator.


  1. You must expand GloopDocsDemo.groovy's tree in the Navigator view to do this.