in memory session for http://nanohttpd.org
public interface ISession {
public String get(String key);//get session, if first time then session will be created
public void set(String key, String value);//set session, if first time then session will be created
public void clear();// clear session and delete from memory
public boolean isExits();// check session is already created or not
public void setExpireTime(int minute);// set expire time for session in minute, default 30 minute
//session will be clear automatically after expire time, if before expire time access session then time start from 0
}