HUDSON-3386 Added method to return total number of configured executors for a...

HUDSON-3386 Added method to return total number of configured executors for a Label and modified the Item configuration UI to check if a label has any configured executors.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@16765 71c3de6d-444a-0410-be80-ed276b4c234a

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

@@ -132,6 +132,21 @@ public class Label implements Comparable<Label>, ModelObject {
         }
         return clouds;
     }
+    
+    /**
+     * Number of total {@link Executor}s that belong to this label.
+     * <p>
+     * This includes executors that belong to offline nodes.
+     */
+    public int getTotalConfiguredExecutors() {
+        int r=0;
+        for (Node n : getNodes()) {
+            Computer c = n.toComputer();
+            if(c!=null)
+                r += c.countExecutors();
+        }
+        return r;
+    }
 
     /**
      * Number of total {@link Executor}s that belong to this label that are functioning.

core/src/main/resources/hudson/model/AbstractItem/configure-common.jelly

@@ -49,8 +49,10 @@ THE SOFTWARE.
       <f:entry title="${%Node}">
         <select class="setting-input" name="slave">
           <j:forEach var="s" items="${app.labels}">
-            <f:option selected="${s==it.assignedLabel}" value="${s.name}"
-              >${s.name} <j:if test="${!empty(s.description)}">(${s.description})</j:if></f:option>
+            <j:if test="${s.totalConfiguredExecutors &gt; 0}">
+              <f:option selected="${s==it.assignedLabel}" value="${s.name}"
+                >${s.name} <j:if test="${!empty(s.description)}">(${s.description})</j:if></f:option>
+            </j:if>
           </j:forEach>
         </select>
       </f:entry>