////////////////////////////////////////////////////////////////////////////////
/// 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_REPLICATION_DATABASE_REPLICATION_APPLIER_H
#define ARANGOD_REPLICATION_DATABASE_REPLICATION_APPLIER_H 1

#include "Basics/Common.h"
#include "Replication/ReplicationApplier.h"
#include "VocBase/voc-types.h"

struct TRI_vocbase_t;

namespace arangodb {

/// @brief replication applier for a single database
class DatabaseReplicationApplier final : public ReplicationApplier {
  friend class DatabaseTailingSyncer;
  friend class RestReplicationHandler;

 public:
  explicit DatabaseReplicationApplier(TRI_vocbase_t& vocbase);

  DatabaseReplicationApplier(ReplicationApplierConfiguration const& configuration,
                             TRI_vocbase_t& vocbase);

  ~DatabaseReplicationApplier();

  /// @brief whether or not the applier is the global one
  bool isGlobal() const override { return false; }

  /// @brief execute the check condition
  bool applies() const override;

  /// @brief stop the applier and "forget" everything
  void forget() override;

  /// @brief configure the replication applier
  void reconfigure(ReplicationApplierConfiguration const& configuration) override;

  /// @brief store the configuration for the applier
  void storeConfiguration(bool doSync) override;

  /// @brief factory function for creating a database-specific replication
  /// applier
  static DatabaseReplicationApplier* create(TRI_vocbase_t& vocbase);

  /// @brief load a persisted configuration for the applier
  static ReplicationApplierConfiguration loadConfiguration(TRI_vocbase_t& vocbase);

  std::shared_ptr<InitialSyncer> buildInitialSyncer() const override;
  std::shared_ptr<TailingSyncer> buildTailingSyncer(TRI_voc_tick_t initialTick, bool useTick,
                                                    TRI_voc_tick_t barrierId) const override;

 protected:
  std::string getStateFilename() const override;

 private:
  TRI_vocbase_t& _vocbase;
};

}  // namespace arangodb

#endif