/**
 * Copyright 2013-2021 Software Radio Systems Limited
 *
 * This file is part of srsRAN.
 *
 * srsRAN is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * srsRAN 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 Affero General Public License for more details.
 *
 * A copy of the GNU Affero General Public License can be found in
 * the LICENSE file in the top-level directory of this distribution
 * and at http://www.gnu.org/licenses/.
 *
 */

#ifndef SRSLOG_DETAIL_LOG_BACKEND_H
#define SRSLOG_DETAIL_LOG_BACKEND_H

#include "srsran/srslog/bundled/fmt/printf.h"
#include "srsran/srslog/shared_types.h"

namespace srslog {

namespace detail {

struct log_entry;

/// The log backend receives generated log entries from the application. Each
/// entry gets distributed to the corresponding sinks.
/// NOTE: Thread safe class.
class log_backend
{
public:
  virtual ~log_backend() = default;

  /// Starts the processing of incoming log entries.
  /// NOTE: Calling this function more than once has no side effects.
  virtual void start(backend_priority priority = backend_priority::normal) = 0;

  /// Allocates a dyn_arg_store and returns a pointer to it on success, otherwise returns nullptr.
  virtual fmt::dynamic_format_arg_store<fmt::printf_context>* alloc_arg_store() = 0;

  /// Pushes a log entry into the backend. Returns true on success, otherwise
  /// false.
  virtual bool push(log_entry&& entry) = 0;

  /// Returns true when the backend has been started, otherwise false.
  virtual bool is_running() const = 0;
};

} // namespace detail

} // namespace srslog

#endif // SRSLOG_DETAIL_LOG_BACKEND_H