/*

 * 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

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 *

 */

#ifndef SHARE_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTMANAGER_HPP

#define SHARE_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTMANAGER_HPP

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

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

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

class JfrCheckpointManager;

class JfrChunkWriter;

class JfrSerializer;

class JfrTypeManager;

class Mutex;

class Thread;

struct JfrCheckpointEntry {

  jlong size;

  jlong start_time;

  jlong duration;

  juint flushpoint;

  juint nof_segments;

};

typedef JfrMemorySpace<JfrBuffer, JfrMspaceSequentialRetrieval, JfrCheckpointManager> JfrCheckpointMspace;

//

// Responsible for maintaining checkpoints and by implication types.

// A checkpoint is an event that has a payload consisting of constant types.

// A constant type is a binary relation, a set of key-value pairs.

//

class JfrCheckpointManager : public JfrCHeapObj {

 public:

  typedef JfrCheckpointMspace::Type Buffer;

 private:

  JfrCheckpointMspace* _free_list_mspace;

  JfrCheckpointMspace* _epoch_transition_mspace;

  Mutex* _lock;

  const Thread* _service_thread;

  JfrChunkWriter& _chunkwriter;

  bool _checkpoint_epoch_state;

  // mspace callback

  void register_full(Buffer* t, Thread* thread);

  void lock();

  void unlock();

  DEBUG_ONLY(bool is_locked() const;)

  static Buffer* lease_buffer(Thread* t, size_t size = 0);

  static Buffer* flush(Buffer* old, size_t used, size_t requested, Thread* t);

  size_t clear();

  size_t write();

  size_t write_epoch_transition_mspace();

  size_t write_types();

  size_t write_safepoint_types();

  void write_type_set();

  void shift_epoch();

  void synchronize_epoch();

  bool use_epoch_transition_mspace(const Thread* t) const;

  JfrCheckpointManager(JfrChunkWriter& cw);

  ~JfrCheckpointManager();

  static JfrCheckpointManager& instance();

  static JfrCheckpointManager* create(JfrChunkWriter& cw);

  bool initialize();

  static void destroy();

 public:

  void register_service_thread(const Thread* t);

  static void write_type_set_for_unloaded_classes();

  static void write_thread_checkpoint(JavaThread* jt);

  friend class JfrRecorder;

  friend class JfrRecorderService;

  friend class JfrCheckpointFlush;

  friend class JfrCheckpointWriter;

  friend class JfrSerializer;

  friend class JfrStackTraceRepository;

  template <typename, template <typename> class, typename>

  friend class JfrMemorySpace;

};

#endif // SHARE_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTMANAGER_HPP