Added the setSlaves() to enable programmatic slave configuration.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@11516 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/Hudson.java

@@ -958,6 +958,24 @@ public final class Hudson extends View implements ItemGroup<TopLevelItem>, Node,
         return Collections.unmodifiableList(slaves);
     }
 
+    /**
+     * Updates the slave list.
+     */
+    public void setSlaves(List<Slave> slaves) throws IOException {
+        this.slaves = new ArrayList<Slave>(slaves);
+        updateComputerList();
+
+        // label trim off
+        for (Iterator<Label> itr = labels.values().iterator(); itr.hasNext();) {
+            Label l = itr.next();
+            l.reset();
+            if(l.getNodes().isEmpty())
+                itr.remove();
+        }
+
+        save();
+    }
+
     /**
      * Gets the system default quiet period.
      */
@@ -1618,6 +1636,8 @@ public final class Hudson extends View implements ItemGroup<TopLevelItem>, Node,
     public synchronized void doConfigExecutorsSubmit( StaplerRequest req, StaplerResponse rsp ) throws IOException, ServletException {
         checkPermission(ADMINISTER);
 
+        BulkChange bc = new BulkChange(this);
+        try {
             JSONObject json = req.getSubmittedForm();
 
             numExecutors = Integer.parseInt(req.getParameter("numExecutors"));
@@ -1626,22 +1646,11 @@ public final class Hudson extends View implements ItemGroup<TopLevelItem>, Node,
             else
                 mode = Mode.NORMAL;
 
-        {
-            // update slave list
-            this.slaves = req.bindJSONToList(Slave.class,json.get("slaves"));
-            updateComputerList();
-
-            // label trim off
-            for (Iterator<Label> itr = labels.values().iterator(); itr.hasNext();) {
-                Label l = itr.next();
-                l.reset();
-                if(l.getNodes().isEmpty())
-                    itr.remove();
-            }
+            setSlaves(req.bindJSONToList(Slave.class,json.get("slaves")));
+        } finally {
+            bc.commit();
         }
 
-        save();
-
         rsp.sendRedirect(req.getContextPath()+'/');  // go to the top page
     }