Limit the excessive time taken by layout

Author: emmanue1

src/main/java/org/jd/core/v1/service/layouter/LayoutFragmentProcessor.java

@@ -55,8 +55,13 @@ public void process(Message message) throws Exception {
             UpdateSpacerBetweenMovableBlocksVisitor visitor = new UpdateSpacerBetweenMovableBlocksVisitor();
 
             // Try to release constraints twice for each section
+            int sumOfRates = Integer.MAX_VALUE;
             int max = sections.size() * 2;
 
+            if (max > 20) {
+                max = 20;
+            }
+
             for (int loop=0; loop<max; loop++) {
                 // Update spacers
                 visitor.reset();
@@ -84,6 +89,7 @@ public void process(Message message) throws Exception {
                 }
 
                 // Update the ratings
+                int newSumOfRates = 0;
                 Section mostConstrainedSection = sections.get(0);
 
                 for (Section section : sections) {
@@ -92,6 +98,8 @@ public void process(Message message) throws Exception {
                     if (mostConstrainedSection.getRate() < section.getRate()) {
                         mostConstrainedSection = section;
                     }
+
+                    newSumOfRates += section.getRate();
                 }
 
                 //  Move fragments from the most constrained section
@@ -100,6 +108,13 @@ public void process(Message message) throws Exception {
                     break;
                 }
 
+                if (sumOfRates > newSumOfRates) {
+                    sumOfRates = newSumOfRates;
+                } else {
+                    // The sum of the constraints does not decrease -> Quit loop
+                    break;
+                }
+
                 if (! mostConstrainedSection.releaseConstraints(holder)) {
                     break;
                 }