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diff --git a/src/h2load_session.h b/src/h2load_session.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2014 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef H2LOAD_SESSION_H
+#define H2LOAD_SESSION_H
+
+#include "nghttp2_config.h"
+
+#include <sys/types.h>
+
+#include <cinttypes>
+
+#include "h2load.h"
+
+namespace h2load {
+
+class Session {
+public:
+  virtual ~Session() {}
+  // Called when the connection was made.
+  virtual void on_connect() = 0;
+  // Called when one request must be issued.
+  virtual int submit_request() = 0;
+  // Called when incoming bytes are available. The subclass has to
+  // return the number of bytes read.
+  virtual int on_read(const uint8_t *data, size_t len) = 0;
+  // Called when write is available. Returns 0 on success, otherwise
+  // return -1.
+  virtual int on_write() = 0;
+  // Called when the underlying session must be terminated.
+  virtual void terminate() = 0;
+  // Return the maximum concurrency per connection
+  virtual size_t max_concurrent_streams() = 0;
+};
+
+} // namespace h2load
+
+#endif // H2LOAD_SESSION_H