aswi2020vldc-gitlab/src/main/java/vldc/aswi/service/FunctionManagerImpl.java @ 621e3fca

package vldc.aswi.service;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.context.event.EventListener;
import org.springframework.core.annotation.Order;
import org.springframework.dao.InvalidDataAccessResourceUsageException;
import org.springframework.stereotype.Service;
import vldc.aswi.dao.FunctionRepository;
import vldc.aswi.domain.Function;

import javax.transaction.Transactional;
import java.util.LinkedList;
import java.util.List;

/**
 * Manager for Function.
 */
@Service
@Slf4j
public class FunctionManagerImpl implements  FunctionManager {

    /** Autowired function repository. */
    @Autowired
    private FunctionRepository functionRepository;

    /**
     * Initialization setup for function manager.
     * Check if table "Funkce" exists.
     */
    @EventListener(classes = {
            ContextRefreshedEvent.class
    })
    @Order(1)
    @Transactional
    public void setup() {
        try {
            if (this.functionRepository.count() == 0) {
                // Just checking if table exists.
            }
        }
        catch (InvalidDataAccessResourceUsageException e) {
            log.error("Table \"Funkce\" did not exists in database!");
            System.exit(1);
        }
    }

    /**
     * Get all functions from database.
     * @return List of functions.
     */
    @Override
    public List<Function> getFunctions() {
        List<Function> retVal = new LinkedList<>();
        this.functionRepository.findAll().forEach(retVal::add);
        return retVal;
    }
}