/*

 * Copyright (c) 2016, 2018, 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.

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 */

#ifndef SHARE_VM_JFR_WRITERS_JFRSTORAGEHOST_INLINE_HPP

#define SHARE_VM_JFR_WRITERS_JFRSTORAGEHOST_INLINE_HPP

#include "jfr/writers/jfrStorageHost.hpp"

template <typename Adapter, typename AP>

inline void StorageHost<Adapter, AP>::bind() {

  if (is_backed()) {

    this->hard_reset();

    assert(is_valid(), "invariant");

    return;

  }

  this->set_start_pos(NULL);

  this->set_current_pos((const u1*)NULL);

  this->set_end_pos(NULL);

}

template <typename Adapter, typename AP>

inline void StorageHost<Adapter, AP>::soft_reset() {

  this->set_start_pos(this->current_pos());

}

template <typename Adapter, typename AP>

inline void StorageHost<Adapter, AP>::hard_reset() {

  this->set_start_pos(_adapter.pos());

  this->set_current_pos(_adapter.pos());

  this->set_end_pos(_adapter.end());

}

template <typename Adapter, typename AP>

inline void StorageHost<Adapter, AP>::cancel() {

  this->set_end_pos(NULL);

}

template <typename Adapter, typename AP>

inline bool StorageHost<Adapter, AP>::is_backed() {

  return _adapter.storage() != NULL;

}

template <typename Adapter, typename AP>

inline bool StorageHost<Adapter, AP>::accommodate(size_t used, size_t requested) {

  if (!_adapter.flush(used, requested)) {

    this->cancel();

    return false;

  }

  assert(is_backed(), "invariant");

  this->hard_reset();

  this->set_current_pos(used);

  return true;

}

template <typename Adapter, typename AP>

inline void StorageHost<Adapter, AP>::commit() {

  if (this->is_valid()) {

    assert(_adapter.pos() == this->start_pos(), "invariant");

    assert(_adapter.end() == this->end_pos(), "invariant");

    u1* new_position = this->current_pos();

    _adapter.commit(new_position);

    this->set_start_pos(new_position);

  }

}

template <typename Adapter, typename AP>

inline void StorageHost<Adapter, AP>::release() {

  _adapter.release();

}

template <typename Adapter, typename AP>

inline StorageHost<Adapter, AP>::StorageHost(typename Adapter::StorageType* storage, Thread* thread) : Position<AP>(), _adapter(storage, thread) {

  bind();

}

template <typename Adapter, typename AP>

inline StorageHost<Adapter, AP>::StorageHost(typename Adapter::StorageType* storage, size_t size) : Position<AP>(), _adapter(storage, size) {

  bind();

}

template <typename Adapter, typename AP>

inline StorageHost<Adapter, AP>::StorageHost(Thread* thread) : Position<AP>(), _adapter(thread) {

  bind();

}

template <typename Adapter, typename AP>

inline bool StorageHost<Adapter, AP>::is_valid() const {

  return this->end_pos() != NULL;

}

template <typename Adapter, typename AP>

inline typename Adapter::StorageType* StorageHost<Adapter, AP>::storage() {

  return _adapter.storage();

}

template <typename Adapter, typename AP>

inline void StorageHost<Adapter, AP>::set_storage(typename Adapter::StorageType* storage) {

  _adapter.set_storage(storage);

  bind();

}

template <typename Adapter, typename AP>

inline void StorageHost<Adapter, AP>::flush() {

  this->accommodate(this->is_valid() ? this->used_size() : 0, 0);

}

template <typename Adapter, typename AP>

inline void StorageHost<Adapter, AP>::seek(intptr_t offset) {

  if (this->is_valid()) {

    assert(offset >= 0, "negative offsets not supported");

    assert(this->start_pos() + offset <= this->end_pos(), "invariant");

    assert(this->start_pos() + offset >= this->start_pos(), "invariant");

    this->set_current_pos(this->start_pos() + offset);

  }

}

#endif // SHARE_VM_JFR_WRITERS_JFRSTORAGEHOST_INLINE_HPP