point-to-point: Extending helper interface to support setting individual queue parameters

src/point-to-point/helper/point-to-point-helper.cc

@@ -53,14 +53,20 @@ PointToPointHelper::SetQueue (std::string type,
                               std::string n3, const AttributeValue &v3,
                               std::string n4, const AttributeValue &v4)
 {
-  m_queueFactory.SetTypeId (type);
+  m_queueFactory = ObjectFactory (type); // to reset any previously set attributes, if any
   m_queueFactory.Set (n1, v1);
   m_queueFactory.Set (n2, v2);
   m_queueFactory.Set (n3, v3);
   m_queueFactory.Set (n4, v4);
 }
 
-void 
+void
+PointToPointHelper::SetQueueAttribute (std::string name, const AttributeValue &value)
+{
+  m_queueFactory.Set (name, value);
+}
+
+void
 PointToPointHelper::SetDeviceAttribute (std::string n1, const AttributeValue &v1)
 {
   m_deviceFactory.Set (n1, v1);

src/point-to-point/helper/point-to-point-helper.h

@@ -76,6 +76,18 @@ public:
                  std::string n3 = "", const AttributeValue &v3 = EmptyAttributeValue (),
                  std::string n4 = "", const AttributeValue &v4 = EmptyAttributeValue ());
 
+  /**
+   * Set an attribute value to be propagated to each Queue created by the
+   * helper.
+   *
+   * \param name the name of the attribute to set
+   * \param value the value of the attribute to set
+   *
+   * Set these attributes on each ns3::Queue created by PointToPointHelper::Install
+   */
+  void
+  SetQueueAttribute (std::string name, const AttributeValue &value);
+
   /**
    * Set an attribute value to be propagated to each NetDevice created by the
    * helper.