Class PageServlet

kilo-server/src/main/java/org/httprpc/kilo/PageServlet.java:40–266

Abstract base class for page servlets.

 * Abstract base class for page servlets.
 */
public abstract class PageServlet extends HttpServlet {
    private static final ThreadLocal<HttpServletRequest> request = new ThreadLocal<>();
    private static final ThreadLocal<HttpServletResponse> response = new ThreadLocal<>();

    @Override
    public void init() throws ServletException {
        var fields = getClass().getDeclaredFields();

        for (var i = 0; i < fields.length; i++) {
            var field = fields[i];

            var fieldType = field.getType();

            if (WebService.class.isAssignableFrom(fieldType) && field.getAnnotation(WebService.Instance.class) != null) {
                field.setAccessible(true);

                try {
                    field.set(this, WebService.instances.get(fieldType));
                } catch (IllegalAccessException exception) {
                    throw new UnsupportedOperationException(exception);
                }
            }
        }
    }

    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        if (!request.getMethod().equalsIgnoreCase("GET")) {
            response.setStatus(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
            return;
        }

        try (var connection = openConnection()) {
            if (connection != null) {
                connection.setReadOnly(true);
            }

            WebService.setConnection(connection);

            try {
                process(request, response);
            } catch (Exception exception) {
                log(exception.getMessage(), exception);

                throw exception;
            } finally {
                if (connection != null) {
                    connection.setReadOnly(false);
                }
            }
        } catch (SQLException exception) {
            throw new ServletException(exception);
        } finally {
            WebService.setConnection(null);
        }
    }

    /**