/*

 * 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

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 */

#ifndef SHARE_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTWRITER_HPP

#define SHARE_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTWRITER_HPP

#include "jfr/recorder/storage/jfrBuffer.hpp"

#include "jfr/utilities/jfrBlob.hpp"

#include "jfr/utilities/jfrTime.hpp"

#include "jfr/utilities/jfrTypes.hpp"

#include "jfr/writers/jfrEventWriterHost.inline.hpp"

#include "jfr/writers/jfrMemoryWriterHost.inline.hpp"

#include "jfr/writers/jfrStorageAdapter.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 {

  int64_t offset;

  u4 count;

};

class JfrCheckpointWriter : public JfrCheckpointWriterBase {

  friend class JfrSerializerRegistration;

 private:

  JfrTicks _time;

  int64_t _offset;

  u4 _count;

  bool _header;

  u4 count() const;

  void set_count(u4 count);

  void increment();

  const u1* session_data(size_t* size, bool move = false, const JfrCheckpointContext* ctx = NULL);

  void release();

 public:

  ~JfrCheckpointWriter();

  void write_type(JfrTypeId type_id);

  void write_count(u4 nof_entries);

  void write_count(u4 nof_entries, int64_t offset);

  void write_key(u8 key);

  const JfrCheckpointContext context() const;

  void set_context(const JfrCheckpointContext ctx);

  bool has_data() const;

  JfrBlobHandle copy(const JfrCheckpointContext* ctx = NULL);

  JfrBlobHandle move(const JfrCheckpointContext* ctx = NULL);

};

#endif // SHARE_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTWRITER_HPP