--- /dev/null	2019-01-28 17:47:31.000000000 +0800
+++ new/src/share/vm/jfr/recorder/repository/jfrChunkWriter.hpp	2019-01-28 17:47:31.000000000 +0800
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2012, 2019, 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_RECORDER_REPOSITORY_JFRCHUNKWRITER_HPP
+#define SHARE_VM_JFR_RECORDER_REPOSITORY_JFRCHUNKWRITER_HPP
+
+#include "jfr/writers/jfrStorageAdapter.hpp"
+#include "jfr/writers/jfrStreamWriterHost.inline.hpp"
+#include "jfr/writers/jfrWriterHost.inline.hpp"
+
+typedef MallocAdapter<M> JfrStreamBuffer; // 1 mb buffered writes
+typedef StreamWriterHost<JfrStreamBuffer, JfrCHeapObj> JfrBufferedStreamWriter;
+typedef WriterHost<BigEndianEncoder, CompressedIntegerEncoder, JfrBufferedStreamWriter> JfrChunkWriterBase;
+
+class JfrChunkState;
+
+class JfrChunkWriter : public JfrChunkWriterBase {
+  friend class JfrRepository;
+ private:
+  JfrChunkState* _chunkstate;
+
+  bool open();
+  size_t close(intptr_t metadata_offset);
+  void write_header(intptr_t metadata_offset);
+  void set_chunk_path(const char* chunk_path);
+
+ public:
+  JfrChunkWriter();
+  bool initialize();
+  intptr_t size_written() const;
+  intptr_t previous_checkpoint_offset() const;
+  void set_previous_checkpoint_offset(intptr_t offset);
+  void time_stamp_chunk_now();
+};
+
+#endif // SHARE_VM_JFR_RECORDER_REPOSITORY_JFRCHUNKWRITER_HPP