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+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2006 Tatsuhiro Tsujikawa
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#ifndef _D_DHT_ABSTRACT_NODE_LOOKUP_TASK_H_
+#define _D_DHT_ABSTRACT_NODE_LOOKUP_TASK_H_
+
+#include "DHTAbstractTask.h"
+#include "DHTNodeDecl.h"
+#include "DHTNodeLookupEntryDecl.h"
+#include "DHTConstants.h"
+#include "DHTTask.h"
+#include "DHTMessageDecl.h"
+#include "DHTMessageCallbackListener.h"
+
+class DHTAbstractNodeLookupTask:public DHTAbstractTask, public DHTMessageCallbackListener {
+protected:
+  unsigned char _targetID[DHT_ID_LENGTH];
+
+  DHTNodeLookupEntries _entries;
+  
+  size_t _inFlightMessage;
+
+  DHTNodeLookupEntries toEntries(const DHTNodes& nodes) const;
+
+  void sendMessage();
+
+  void updateBucket();
+
+public:
+  DHTAbstractNodeLookupTask(const unsigned char* targetID);
+
+  static const size_t ALPHA = 3;
+
+  virtual void startup();
+
+  virtual void onReceived(const DHTMessageHandle& message);
+
+  virtual void onTimeout(const DHTNodeHandle& node);
+
+  virtual DHTNodes getNodesFromMessage(const DHTMessageHandle& message) = 0;
+  
+  virtual void onReceivedInternal(const DHTMessageHandle& message) {}
+  
+  virtual bool needsAdditionalOutgoingMessage() { return true; }
+  
+  virtual void onFinish() {}
+
+  virtual DHTMessageHandle createMessage(const DHTNodeHandle& remoteNode) = 0;
+};
+
+#endif // _D_DHT_ABSTRACT_NODE_LOOKUP_TASK_H_