////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Jan Steemann
////////////////////////////////////////////////////////////////////////////////

#ifndef ARANGOD_MMFILES_MMFILES_COMPACTION_LOCKER_H
#define ARANGOD_MMFILES_MMFILES_COMPACTION_LOCKER_H 1

#include "Basics/Common.h"
#include "MMFiles/MMFilesCollection.h"

namespace arangodb {

class MMFilesCompactionPreventer {
 public:
  explicit MMFilesCompactionPreventer(MMFilesCollection* collection)
      : _collection(collection) {
    _collection->preventCompaction();
  }

  ~MMFilesCompactionPreventer() { _collection->allowCompaction(); }

 private:
  MMFilesCollection* _collection;
};

class MMFilesTryCompactionPreventer {
 public:
  explicit MMFilesTryCompactionPreventer(MMFilesCollection* collection)
      : _collection(collection), _isLocked(false) {
    _isLocked = _collection->tryPreventCompaction();
  }

  ~MMFilesTryCompactionPreventer() {
    if (_isLocked) {
      _collection->allowCompaction();
    }
  }

  bool isLocked() const { return _isLocked; }

 private:
  MMFilesCollection* _collection;
  bool _isLocked;
};

class MMFilesCompactionLocker {
 public:
  explicit MMFilesCompactionLocker(MMFilesCollection* collection)
      : _collection(collection) {
    _collection->lockForCompaction();
  }

  ~MMFilesCompactionLocker() { _collection->finishCompaction(); }

 private:
  MMFilesCollection* _collection;
};

class MMFilesTryCompactionLocker {
 public:
  explicit MMFilesTryCompactionLocker(MMFilesCollection* collection)
      : _collection(collection), _isLocked(false) {
    _isLocked = _collection->tryLockForCompaction();
  }

  ~MMFilesTryCompactionLocker() {
    if (_isLocked) {
      _collection->finishCompaction();
    }
  }

  bool isLocked() const { return _isLocked; }

 private:
  MMFilesCollection* _collection;
  bool _isLocked;
};

}  // namespace arangodb

#endif