Github user abhishekagarwal87 commented on a diff in the pull request:
https://github.com/apache/storm/pull/1108#discussion_r52884345
--- Diff: storm-core/src/jvm/org/apache/storm/utils/Utils.java ---
@@ -2248,4 +2248,23 @@ public Object call() {
}
return process;
}
+
+ public static <T> List<T> interleaveAll(List<List<T>> nodeList) {
+ if (nodeList != null && nodeList.size() > 0) {
+ List<T> first = new ArrayList<T>();
+ List<List<T>> rest = new ArrayList<List<T>>();
+ for (List<T> node : nodeList) {
+ if (null != node && node.size() > 0) {
+ first.add(node.get(0));
+ rest.add(node.subList(1, node.size()));
--- End diff --
checked that an empty list is returned. So it should be okay as in next
recursion step, we ignore empty list.
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