Call stage from function in Jenkinsfile

Question

I have in my Jenkinsfile:

def foo = ["1", "2", "3"]

def parallelStagesFromMap = foo.collectEntries {
    ["Build ${it}" : generateStage(it)]
}

def generateStage(bar) {
    return {
        stage("Build ${bar}") {
            echo "Building for ${bar}"
        }
    }
}

I can then use them with parallel parallel parallelStagesFromMap but now I'm trying to call one in particular, for example:

generateStage("a") and it is just skipped... Am I missing anything?

Answer 1

You are missing closure invocation. Your generateStage(name) method returns a closure, and this closure is not invoked implicitly. (It works with parallel stages, because parallel method expects a map where each entry value is a closure, so it iterates over all map entries and invokes collected closures).

Here is what your example should look like to add a non-parallel stage to the pipeline using generateStage(name) method:

def foo = ["1", "2", "3"]

def parallelStagesFromMap = foo.collectEntries {
    ["Build ${it}" : generateStage(it)]
}

def generateStage(bar) {
    return {
        stage("Build ${bar}") {
            echo "Building for ${bar}"
        }
    }
}

node {
    parallel parallelStagesFromMap

    generateStage("skipped") // no invocation, stage is skipped

    generateStage("nonparallel").call()
}

And here is what the Blue Ocean UI looks like after running this exemplary pipeline: