text: /*
   * This file is open source software, licensed to you under the terms
   * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
   * distributed with this work for additional information regarding copyright
   * ownership.  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 (C) 2014 Cloudius Systems, Ltd.
   */
  #ifndef _APP_TEMPLATE_HH
  #define _APP_TEMPLATE_HH
  
  #include <boost/program_options.hpp>
  #include <boost/optional.hpp>
  #include <functional>
  #include <core/future.hh>
  #include <core/sstring.hh>
  #include <chrono>
  
  namespace seastar {
  
  class app_template {
  public:
      struct config {
          sstring name = "App";
          std::chrono::duration<double> default_task_quota = std::chrono::microseconds(500);
          config() {}
      };
  
      using configuration_reader = std::function<void (boost::program_options::variables_map&)>;
  private:
      config _cfg;
      boost::program_options::options_description _opts;
      boost::program_options::options_description _opts_conf_file;
      boost::program_options::positional_options_description _pos_opts;
      boost::optional<boost::program_options::variables_map> _configuration;
      configuration_reader _conf_reader;
  
      configuration_reader get_default_configuration_reader();
  public:
      struct positional_option {
          const char* name;
          const boost::program_options::value_semantic* value_semantic;
          const char* help;
          int max_count;
      };
  public:
      explicit app_template(config cfg = config());
  
      boost::program_options::options_description& get_options_description();
      boost::program_options::options_description& get_conf_file_options_description();
      boost::program_options::options_description_easy_init add_options();
      void add_positional_options(std::initializer_list<positional_option> options);
      boost::program_options::variables_map& configuration();
      int run_deprecated(int ac, char ** av, std::function<void ()>&& func);
  
      void set_configuration_reader(configuration_reader conf_reader);
  
      // Runs given function and terminates the application when the future it
      // returns resolves. The value with which the future resolves will be
      // returned by this function.
      int run(int ac, char ** av, std::function<future<int> ()>&& func);
  
      // Like run_sync() which takes std::function<future<int>()>, but returns
      // with exit code 0 when the future returned by func resolves
      // successfully.
      int run(int ac, char ** av, std::function<future<> ()>&& func);
  };
  
  }
  
  #endif
  