fix bug 29

--HG--
rename : src/node/drop-tail.cc => src/node/drop-tail-queue.cc
rename : src/node/drop-tail.h => src/node/drop-tail-queue.h

src/node/drop-tail-queue.cc

@@ -0,0 +1,111 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2007 University of Washington
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "ns3/debug.h"
+#include "drop-tail-queue.h"
+
+NS_DEBUG_COMPONENT_DEFINE ("DropTailQueue");
+
+namespace ns3 {
+
+const ClassId DropTailQueue::cid = 
+  MakeClassId<DropTailQueue> ("DropTailQueue", Queue::iid);
+
+
+DropTailQueue::DropTailQueue () :
+  Queue (),
+  m_packets (),
+  m_maxPackets(DTQ_NPACKETS_MAX_DEFAULT)
+{
+  NS_DEBUG("DropTailQueue::DropTailQueue ()");
+}
+
+DropTailQueue::~DropTailQueue ()
+{
+  NS_DEBUG("DropTailQueue::~DropTailQueue ()");
+}
+
+void 
+DropTailQueue::SetMaxPackets (uint32_t npackets)
+{
+  NS_DEBUG("DropTailQueue::SetMaxPackets (" << npackets << ")");
+
+  m_maxPackets = npackets;
+}
+
+uint32_t 
+DropTailQueue::GetMaxPackets (void)
+{
+  NS_DEBUG("DropTailQueue::GetMaxPackets () <= " << m_maxPackets);
+
+  return m_maxPackets;
+}
+
+bool 
+DropTailQueue::DoEnqueue (const Packet& p)
+{
+  NS_DEBUG("DropTailQueue::DoEnqueue (" << &p << ")");
+
+  if (m_packets.size () >= m_maxPackets)
+    {
+      NS_DEBUG("DropTailQueue::DoEnqueue (): Queue full -- droppping pkt");
+      Drop (p);
+      return false;
+    }
+
+  m_packets.push(p);
+  return true;
+}
+
+bool
+DropTailQueue::DoDequeue (Packet& p)
+{
+  NS_DEBUG("DropTailQueue::DoDequeue (" << &p << ")");
+
+  if (m_packets.empty()) 
+    {
+      NS_DEBUG("DropTailQueue::DoDequeue (): Queue empty");
+      return false;
+    }
+
+  p = m_packets.front ();
+  m_packets.pop ();
+
+  NS_DEBUG("DropTailQueue::DoDequeue (): Popped " << &p << " <= true");
+
+  return true;
+}
+
+bool
+DropTailQueue::DoPeek (Packet& p)
+{
+  NS_DEBUG("DropTailQueue::DoPeek (" << &p << ")");
+
+  if (m_packets.empty()) 
+    {
+      NS_DEBUG("DropTailQueue::DoPeek (): Queue empty");
+      return false;
+    }
+
+  p = m_packets.front ();
+
+  return true;
+}
+
+}; // namespace ns3