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diff --git a/src/WebSocketSession.h b/src/WebSocketSession.h
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+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2012 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_WEB_SOCKET_SESSION_H
+#define D_WEB_SOCKET_SESSION_H
+
+#include "common.h"
+
+#include <wslay/wslay.h>
+
+#include "SharedHandle.h"
+
+namespace aria2 {
+
+class SocketCore;
+class DownloadEngine;
+
+namespace rpc {
+
+class WebSocketInteractionCommand;
+
+class WebSocketSession {
+public:
+  WebSocketSession(const SharedHandle<SocketCore>& socket,
+                   DownloadEngine* e);
+  ~WebSocketSession();
+  // Returns true if this session object wants to read data from the
+  // remote endpoint.
+  bool wantRead();
+  // Returns true if this session object wants to write data to the
+  // remote endpoint.
+  bool wantWrite();
+  // Returns true if the session ended and the underlying connection
+  // can be closed.
+  bool finish();
+  // Call this function when data is available to read.  This function
+  // returns 0 if it succeeds, or -1.
+  int onReadEvent();
+  // Call this function when data can be sent without blocking.  This
+  // function returns 0 if it succeeds, or -1.
+  int onWriteEvent();
+  // Adds text message |msg|. The message is queued and will be sent
+  // in onWriteEvent().
+  void addTextMessage(const std::string& msg);
+  // Returns true if the close frame is received.
+  bool closeReceived();
+  // Returns true if the close frame is sent.
+  bool closeSent();
+
+  const SharedHandle<SocketCore>& getSocket() const
+  {
+    return socket_;
+  }
+
+  DownloadEngine* getDownloadEngine()
+  {
+    return e_;
+  }
+
+  WebSocketInteractionCommand* getCommand()
+  {
+    return command_;
+  }
+
+  void setCommand(WebSocketInteractionCommand* command)
+  {
+    command_ = command;
+  }
+private:
+  SharedHandle<SocketCore> socket_;
+  DownloadEngine* e_;
+  wslay_event_context_ptr wsctx_;
+  WebSocketInteractionCommand* command_;
+};
+
+} // namespace rpc
+
+} // namespace aria2
+
+#endif // D_WEB_SOCKET_SESSION_H