Jenkins Pipeline Library and client module - jenkins-pipeline

Question

I just got started on a Jenkins pipeline school assignment. The pipeline structure resides in a library and there is a client module that refers to it, in its Jenkinsfile.
Is it possible to delegate execution to a class in the client module without invoking a script using env (sh or cmd).
I want to invoke a class directly. Does Jenkins maintain classloader isolation b/n library and external module?
Does it explode both client and lib in a common workspace and then load them together?
Or
Can I load a class lazily at runtime? Say, the pipeline in the library knows the client class (startup param or script invocation) and then instantiates it and transfers control to it? Something like an SPI.
App design:
Library ABC with src/vars/resources.
Module X uses #Library('ABC') -Jenkinsfile invokes pipeline in the Library ABC.
Module X structure
src/
package/class1
I am trying to use the GroovyClassLoader to load a groovy src file for class1 in Library script and invoke it. The Jenkins pipeline however, does not permit GroovyClassLoader in the script. How do I whitelist it?

Answer 1

I assume that your Jenkins shared library has the following structure.
ABC
|
|----src/
|----resorces/
|----var/
You can create a Test.groovy file under src
package com.jenkins
class Test {
def execute(def dsl){
dsl.echo "I am inside the Test class"
println("I am also inside the Test class")
}
}
Create a pipeline.groovy under var directory.
An example pipeline.groovy will be
import com.jenkins.Test
def call(final Map parameters = [:]) {
node('master'){
Test.execute(this) //This utilizes the class that you have defined. I
}
}
Now the module can have a Jenkins file with the following content.
#Library('ABC')_
pipeline // This invokes pipeline.groovy