/*

 * 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.

 *

 */

#include "precompiled.hpp"

#include "jfr/jfr.hpp"

#include "jfr/leakprofiler/leakProfiler.hpp"

#include "jfr/leakprofiler/checkpoint/objectSampleCheckpoint.hpp"

#include "jfr/metadata/jfrSerializer.hpp"

#include "jfr/recorder/checkpoint/jfrCheckpointWriter.hpp"

#include "jfr/recorder/checkpoint/types/jfrType.hpp"

#include "jfr/recorder/checkpoint/types/jfrTypeManager.hpp"

#include "jfr/utilities/jfrDoublyLinkedList.hpp"

#include "jfr/utilities/jfrIterator.hpp"

#include "memory/resourceArea.hpp"

#include "runtime/handles.inline.hpp"

#include "runtime/thread.inline.hpp"

#include "utilities/exceptions.hpp"

#include "runtime/semaphore.hpp"

class JfrSerializerRegistration : public JfrCHeapObj {

 private:

  JfrSerializerRegistration* _next;

  JfrSerializerRegistration* _prev;

  JfrSerializer* _serializer;

  mutable JfrBlobHandle _cache;

  JfrTypeId _id;

  bool _permit_cache;

 public:

  JfrSerializerRegistration(JfrTypeId id, bool permit_cache, JfrSerializer* serializer) :

    _next(NULL), _prev(NULL), _serializer(serializer), _cache(), _id(id), _permit_cache(permit_cache) {}

  ~JfrSerializerRegistration() {

    delete _serializer;

  }

  JfrSerializerRegistration* next() const {

    return _next;

  }

  void set_next(JfrSerializerRegistration* next) {

    _next = next;

  }

  JfrSerializerRegistration* prev() const {

    return _prev;

  }

  void set_prev(JfrSerializerRegistration* prev) {

    _prev = prev;

  }

  JfrTypeId id() const {

    return _id;

  }

};

    return;

  }

}

}

class SerializerRegistrationGuard : public StackObj {

 private:

  static Semaphore _mutex_semaphore;

 public:

  SerializerRegistrationGuard() {

    _mutex_semaphore.wait();

  }

  ~SerializerRegistrationGuard() {

    _mutex_semaphore.signal();

  }

};

Semaphore SerializerRegistrationGuard::_mutex_semaphore(1);

typedef JfrDoublyLinkedList<JfrSerializerRegistration> List;

typedef StopOnNullIterator<const List> Iterator;

static List types;

void JfrTypeManager::clear() {

  SerializerRegistrationGuard guard;

  Iterator iter(types);

  JfrSerializerRegistration* registration;

  while (iter.has_next()) {

    registration = types.remove(iter.next());

    assert(registration != NULL, "invariant");

    delete registration;

  }

}

void JfrTypeManager::on_rotation() {

  const Iterator iter(types);

  while (iter.has_next()) {

    iter.next()->on_rotation();

  }

}

#ifdef ASSERT

static void assert_not_registered_twice(JfrTypeId id, List& list) {

  const Iterator iter(list);

  while (iter.has_next()) {

    assert(iter.next()->id() != id, "invariant");

  }

}

#endif

  assert(serializer != NULL, "invariant");

  JfrSerializerRegistration* const registration = new JfrSerializerRegistration(id, permit_cache, serializer);

  if (registration == NULL) {

    delete serializer;

    return false;

  }

  assert(!types.in_list(registration), "invariant");

  DEBUG_ONLY(assert_not_registered_twice(id, types);)

  if (Jfr::is_recording()) {

    JfrCheckpointWriter writer(STATICS);

    registration->invoke(writer);

    new_registration = true;

  }

  types.prepend(registration);

  return true;

}

bool JfrTypeManager::initialize() {

  SerializerRegistrationGuard guard;

  return true;

}

// implementation for the static registration function exposed in the JfrSerializer api

bool JfrSerializer::register_serializer(JfrTypeId id, bool permit_cache, JfrSerializer* serializer) {

  SerializerRegistrationGuard guard;

}

  if (new_registration) {

    SerializerRegistrationGuard guard;

    new_registration = false;

    return true;

  }

  return false;

}