From 8f81d91cb75ebd6d5befe6478c36698f815f7e9e Mon Sep 17 00:00:00 2001
From: Testo Nakada <test1@doramail.com>
Date: Sun, 1 Nov 2015 10:13:42 -0800
Subject: Performance improvement for topological sort

---
 src/main/java/org/testng/internal/Graph.java | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

(limited to 'src/main/java')

diff --git a/src/main/java/org/testng/internal/Graph.java b/src/main/java/org/testng/internal/Graph.java
index df121a8f..d833610e 100644
--- a/src/main/java/org/testng/internal/Graph.java
+++ b/src/main/java/org/testng/internal/Graph.java
@@ -54,10 +54,7 @@ public class Graph<T> {
       node.addPredecessor(predecessor);
       addNeighbor(tm, predecessor);
       // Remove these two nodes from the independent list
-      if (null == m_independentNodes) {
-        m_independentNodes = Maps.newHashMap();
-        m_independentNodes.putAll(m_nodes);
-      }
+      initializeIndependentNodes();
       m_independentNodes.remove(predecessor);
       m_independentNodes.remove(tm);
       ppp("  REMOVED " + predecessor + " FROM INDEPENDENT OBJECTS");
@@ -103,9 +100,7 @@ public class Graph<T> {
   public void topologicalSort() {
     ppp("================ SORTING");
     m_strictlySortedNodes = Lists.newArrayList();
-    if (null == m_independentNodes) {
-      m_independentNodes = Maps.newHashMap();
-    }
+    initializeIndependentNodes();
 
     //
     // Clone the list of nodes but only keep those that are
@@ -159,6 +154,20 @@ public class Graph<T> {
     }
   }
 
+  private void initializeIndependentNodes() {
+    if (null == m_independentNodes) {
+      List<Node<T>> list = Lists.newArrayList(m_nodes.values());
+      // Ideally, we should not have to sort this. However, due to a bug where it treats all the methods as
+      // dependent nodes. Therefore, all the nodes were mostly sorted alphabetically. So we need to keep
+      // the behavior for now.
+      Collections.sort(list);
+      m_independentNodes = Maps.newLinkedHashMap();
+      for (Node<T> node : list) {
+        m_independentNodes.put(node.getObject(), node);
+      }
+    }
+  }
+
   private void dumpSortedNodes() {
     System.out.println("====== SORTED NODES");
     for (T n : m_strictlySortedNodes) {
-- 
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