each-parallel.groovy

def generateJinja2DashboardStep(index, openshiftMap) {
    echo "$index == $openshiftMap"
    openshiftMap.each { project ->

        sh """
            echo "hello${project}" >> batch${index}.tmp
        """
    }

    def batchName = "batch${index}"
    stash includes: '*.tmp', name: "$batchName"
}

node('maven') {
    stage('stepsForParallel') {
        script {
            def openshiftMap = [0, 1, 2, 3, 4]
            def openshiftMapSplit = openshiftMap.collate(2)

            echo "openshiftMapSplit = $openshiftMapSplit"

            def parallelSteps = [:]
            openshiftMapSplit.eachWithIndex { currentMap, index ->
                parallelSteps += ["batch${index}": { 
                    node('maven') {
                        stage("batch${index}") {
                            generateJinja2DashboardStep(index, currentMap)
                        }
                    }
                }]
            }

            parallel parallelSteps

            dir("dashboards") {
                openshiftMapSplit.eachWithIndex { it2, index ->
                    unstash "batch${index}"

                    sh "cat batch${index}.tmp"
                }
            }
        }
    }
}