The Groovy component allows developers to add Groovy scripts to applications without reengineering legacy code. It can intercept messages and alter property values as messages flow through. The component supports directly entering script text, referencing an external script file, or using a Java bean. Examples demonstrate string replacement using parameters, throwing exceptions, and making a thread sleep.

1. Using Groovy Component
- By Rahul Kumar

2. Groovy
The Groovy Component is handy when you’re modernizing legacy systems, as
you can simply throw the old lines of code into a component instead of having
to reengineer the code’s behavior through a series of different Mule
components (this is not ideal from a debugging and maintenance perspective,
though).
Groovy also allows the developer to configure interceptors and alter the values
or references of particular properties in a script. Interceptors are configured to
provide additional services to a message as it flows through a component

3. Groovy
Script Text: Type the script that the component will load directly into this
space.
Script File: Enter the location of the script to be loaded by the component.
The file can reside on the classpath or the local file system.
Bean Reference: Lets you add a Java bean, which encapsulates multiple
objects into a single bean. The Script component can then store and reuse
the bean when applicable.

4. Examples
<flow name="groovyTransformerWithParameters">
<script:transformer name="stringReplaceWithParams">
<script:script engine="groovy">
<property key="oldStr" value="l" />
<property key="newStr" value="x" />
<script:text>
return payload.toString().replaceAll("$oldStr", "$newStr")
</script:text> </script:script>
</script:transformer> </flow>
This example demonstrates simple string replacement.

5. Examples
<<scripting:component doc:name="Script">
<scripting:script engine="Groovy"><![CDATA[
throw new IllegalArgumentException('bad arg')
]]></scripting:script>
</scripting:component>
This example demonstrates throwing Exception with Groovy

6. Examples
<<scripting:component doc:name="Script">
<scripting:script engine="Groovy"><![CDATA[
Thread.sleep(60000)
]]></scripting:script>
</scripting:component>
This example demonstrates how to use Groovy to make the Thread sleep for 1 munute.

7. Thank You !!