How to run multiple agents (given on runtime) simultaneously with Jenkins Declarative Pipeline?

Question

I'm running a Jenkins Job on multiple platforms selected manually at runtime. Having multi-select Active Choices Parameter named "Platforms" for the relevant nodes.

I'm using the following code in Jenkins scripted pipeline:

def labels=Platforms.toString().split(",").collect{"\'" + it + "\'"}
    def builders=[:]
    
    for (label in labels) {
        builders[label] = {
                node(label) {
                    stage ('Stage 1') {
                        sh 'hostname'
                    }
                }
        }
    }
    parallel builders

How can I accomplish the same thing in Declarative Pipeline? The agents are selected randomly by the user at runtime.

Thanks.

Answer 1

Ok, I found my answer here: Running same Jenkins job on multiple agents in parallel in declarative pipeline Thanks to user 'np2807'. My code is now looking like this:

def labels=Platforms.toString().split(",").collect{"\'" + it + "\'"}

def generateStage(nodeLabel) {
    return {
        stage("Runs on ${nodeLabel}") {
            node(nodeLabel) {
                stage("Stage 1") {
                   script {
                        echo "Running on ${nodeLabel}"
                        sh 'hostname'
                      }
                 }
            }
        }
    }
}

def parallelStagesMap = labels.collectEntries {
    ["${it}" : generateStage(it)]
}

pipeline {
    agent none
    stages {
        stage('non-parallel stage') {
            steps {
                echo 'This stage will be executed first.'
            }
        }
        stage('parallel stage') {
            steps {
                script {
                    parallel parallelStagesMap
                }
            }
        }       
    }
}