--- /dev/null	2017-11-09 09:38:01.297999907 +0100
+++ new/src/hotspot/share/jfr/writers/jfrStreamWriterHost.hpp	2018-04-09 15:31:01.297965044 +0200
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_JFR_WRITERS_JFRSTREAMWRITERHOST_HPP
+#define SHARE_VM_JFR_WRITERS_JFRSTREAMWRITERHOST_HPP
+
+#include "jfr/utilities/jfrTypes.hpp"
+#include "jfr/writers/jfrMemoryWriterHost.inline.hpp"
+
+template <typename Adapter, typename AP> // Adapter and AllocationPolicy
+class StreamWriterHost : public MemoryWriterHost<Adapter, AP> {
+ public:
+  typedef typename Adapter::StorageType StorageType;
+ private:
+  intptr_t _stream_pos;
+  fio_fd _fd;
+  intptr_t current_stream_position() const;
+
+ protected:
+  StreamWriterHost(StorageType* storage, Thread* thread);
+  StreamWriterHost(StorageType* storage, size_t size);
+  StreamWriterHost(Thread* thread);
+  bool accommodate(size_t used, size_t requested);
+  void bytes(void* dest, const void* src, size_t len);
+  void flush(size_t size);
+  bool has_valid_fd() const;
+
+ public:
+  intptr_t current_offset() const;
+  void seek(intptr_t offset);
+  void flush();
+  void write_unbuffered(const void* src, size_t len);
+  bool is_valid() const;
+  void close_fd();
+  void reset(fio_fd fd);
+};
+
+#endif // SHARE_VM_JFR_WRITERS_JFRSTREAMWRITERHOST_HPP
+