--- /dev/null	2019-01-28 17:47:18.000000000 +0800
+++ new/src/share/vm/jfr/recorder/checkpoint/jfrCheckpointWriter.hpp	2019-01-28 17:47:18.000000000 +0800
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2016, 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_CHECKPOINT_JFRCHECKPOINTWRITER_HPP
+#define SHARE_VM_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTWRITER_HPP
+
+#include "jfr/recorder/checkpoint/jfrCheckpointBlob.hpp"
+#include "jfr/utilities/jfrTraceTime.hpp"
+#include "jfr/writers/jfrEventWriterHost.inline.hpp"
+#include "jfr/writers/jfrMemoryWriterHost.inline.hpp"
+#include "jfr/writers/jfrStorageAdapter.hpp"
+#include "tracefiles/traceTypes.hpp"
+
+class Thread;
+
+class JfrCheckpointFlush : public StackObj {
+ public:
+  typedef JfrBuffer Type;
+  JfrCheckpointFlush(Type* old, size_t used, size_t requested, Thread* t);
+  Type* result() { return _result; }
+ private:
+  Type* _result;
+};
+
+typedef Adapter<JfrCheckpointFlush> JfrCheckpointAdapter;
+typedef AcquireReleaseMemoryWriterHost<JfrCheckpointAdapter, StackObj > JfrTransactionalCheckpointWriter;
+typedef EventWriterHost<BigEndianEncoder, CompressedIntegerEncoder, JfrTransactionalCheckpointWriter> JfrCheckpointWriterBase;
+
+struct JfrCheckpointContext {
+  jlong offset;
+  juint count;
+};
+
+class JfrCheckpointWriter : public JfrCheckpointWriterBase {
+  friend class JfrSerializerRegistration;
+ private:
+  JfrTraceTime _time;
+  jlong _offset;
+  juint _count;
+  bool _flushpoint;
+  bool _header;
+
+  juint count() const;
+  void set_count(juint count);
+  void increment();
+  void set_flushpoint(bool flushpoint);
+  bool is_flushpoint() const;
+  const u1* session_data(size_t* size, const JfrCheckpointContext* ctx = NULL);
+  void release();
+
+ public:
+  JfrCheckpointWriter(bool flushpoint, bool header, Thread* thread);
+  ~JfrCheckpointWriter();
+  void write_constant_type(JfrConstantTypeId constant_type_id);
+  void write_number_of_constants(u4 nof_entries);
+  void write_number_of_constants(u4 nof_entries, jlong offset);
+  void write_key(u8 key);
+  const JfrCheckpointContext context() const;
+  void set_context(const JfrCheckpointContext ctx);
+  bool has_data() const;
+  JfrCheckpointBlobHandle checkpoint_blob();
+  JfrCheckpointBlobHandle copy(const JfrCheckpointContext* ctx = NULL);
+  JfrCheckpointBlobHandle move(const JfrCheckpointContext* ctx = NULL);
+};
+
+#endif // SHARE_VM_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTWRITER_HPP