public interface SiteKeyConfigService {

    Map<String, String> getSiteKeyConfig();
 
}

@Entity
public class SiteKeyConfig{

private String key;
private String value;


}

@Repository
public class DefaultSiteKeyConfigService extends DefaultBindableDAO<SiteKeyConfig> implements SiteKeyConfigService{
    
    private ConcurrentMap<String, String> siteConfig;
    private Lock lock = new ReentrantLock();
    
   @PostConstruct
   public void postConstruct(){
       load();
   }
   
   @Transactional
    public void load() {
       ConcurrentMap<String, String>  config = new ConcurrentHashMap<String, String>();
        //TODO запросы select
        List<SiteKeyConfig> siteKeyConfigs =  getByCriteria(detachedCriteria, 0, 100);
        for (SiteKeyConfig siteKeyConfig : siteKeyConfigs) {
           config.put(siteKeyConfig.getKey(),siteKeyConfig.getValue());
       }
        
     
        
       this.siteConfig = config;
    }
    
    @Override
    public Map<String, String> getSiteKeyConfig() {
        return Collections.unmodifiableMap(siteConfig);
    }
    

    public String getValue(String key){
        if(siteConfig != null)
            return siteConfig.get(key);
        return null;
    }
    
    @Override
    public SiteKeyConfig save(SiteKeyConfig cfg) {
        cfg = super.save(cfg);
        load();
        return cfg;
    }
    
    
   // @Scheduled(fixedDelay = 60 * 1000)
    public void updateSiteConfig() {
        load();
    }