Config.h

/*
 * Config.h
 *
 *  Created on: Apr 4, 2014
 *      Author: wangli
 */

#ifndef CONFIG_H_
#define CONFIG_H_
#include <string>
#include <libconfig.h++>

/**
 * This class maintains all the parameter values, which are specified in "config" file.
 * In the debug version, in the initialization phase, default values are usded in case
 * that the value is not given in "config" file.
 */


class Config {
public:
	static Config* getInstance();
	void print_configure()const;
	virtual ~Config();
private:
	Config();
	void initialize();

	/**
	 * Get the configured string value specified by "attribute_name". Return "default_vale"
	 * if the "attribute_name" is not found in the configure file.
	 */
	std::string getString(std::string attribute_name, std::string default_value);

	/**
	 * Get the configured integer value specified by "attribute_name". Return "default_vale"
	 * if the "attribute_name" is not found in the configure file.
	 */
	int getInt(std::string attribute_name, int default_value);

	/**
	 * Get the configured boolean value specified by "attribute_name". Return "default_vale"
	 * if the "attribute_name" is not found in the configure file.
	 * true=1, false=0.
	 */
	bool getBoolean(std::string attribute_name, bool defalut_value);

	static void setConfigFile(std::string file_name);

public:

	static std::string config_file;
	/**
	 * parameter values.
	 * Note: these values are static, so that they can be accessed directly, like Config::data_dir.
	 * Static value must be defined in *.cpp file, otherwise compiler will complain.
	 */
	static std::string data_dir;
	static int max_degree_of_parallelism;
	static int initial_degree_of_parallelism;
	static bool enable_expander_adaptivity;
	static int expander_adaptivity_check_frequency;
	static int scan_batch;
	static std::string hdfs_master_ip;
	static int hdfs_master_port;
	static std::string logfile;
	static bool master;
	static bool local_disk_mode;
	static bool pipelined_exchange;
	static int client_listener_port;
	static bool enable_codegen;
	static std::string catalog_file;
private:
	static Config* instance_;
	libconfig::Config cfg;
};

#endif /* CONFIG_H_ */