@Override protected Long compute() { long count = 0L; List<RecursiveTask<Long>> forks = new LinkedList<>(); for (Folder subFolder : folder.getSubFolders()) { FolderSearchTask task = new FolderSearchTask(subFolder, searchedWord); forks.add(task); task.fork(); } for (Document document : folder.getDocuments()) { DocumentSearchTask task = new DocumentSearchTask(document, searchedWord); forks.add(task); task.fork(); } for (RecursiveTask<Long> task : forks) { count = count + task.join(); } return count; }