Merge pull request #75 from andrejska/parallelFromList-simplified

As some bugs are fixed on Jenkins side pipeline code can be simplified

Author: abayer

pipeline-examples/parallel-from-list/README.md

@@ -5,14 +5,6 @@ a map of steps to be run with the parallel command.
 
 # Caveats
 
-* Due to limitations in Pipeline - i.e.,
-[JENKINS-26481](https://issues.jenkins-ci.org/browse/JENKINS-26481) -
-it's not really possible to use Groovy closures or syntax that depends
-on closures, so you can't do the Groovy standard of using
-.collectEntries on a list and generating the steps as values for the
-resulting entries. You also can't use the standard Java syntax for For
-loops - i.e., "for (String s: strings)" - and instead have to use old
-school counter-based for loops.
 * There is no need for the generation of the step itself to be in a
 separate method. I've opted to do so here to show how to return a step
 closure from a method.

pipeline-examples/parallel-from-list/parallelFromList.groovy

@@ -6,20 +6,8 @@
 def stringsToEcho = ["a", "b", "c", "d"]
 
 // The map we'll store the parallel steps in before executing them.
-def stepsForParallel = [:]
-
-// The standard 'for (String s: stringsToEcho)' syntax also doesn't work, so we
-// need to use old school 'for (int i = 0...)' style for loops.
-for (int i = 0; i < stringsToEcho.size(); i++) {
-    // Get the actual string here.
-    def s = stringsToEcho.get(i)
-
-    // Transform that into a step and add the step to the map as the value, with
-    // a name for the parallel step as the key. Here, we'll just use something
-    // like "echoing (string)"
-    def stepName = "echoing ${s}"
-    
-    stepsForParallel[stepName] = transformIntoStep(s)
+def stepsForParallel = stringsToEcho.collectEntries {
+    ["echoing ${it}" : transformIntoStep(it)]
 }
 
 // Actually run the steps in parallel - parallel takes a map as an argument,