| // *************************************************************************************************************************** |
| // * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * |
| // * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file * |
| // * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance * |
| // * with the License. You may obtain a copy of the License at * |
| // * * |
| // * http://www.apache.org/licenses/LICENSE-2.0 * |
| // * * |
| // * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an * |
| // * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * |
| // * specific language governing permissions and limitations under the License. * |
| // *************************************************************************************************************************** |
| package org.apache.juneau.rest; |
| |
| |
| import java.io.*; |
| import java.util.*; |
| |
| import javax.servlet.*; |
| import javax.servlet.http.*; |
| |
| /** |
| * Class that handles the basic lifecycle of an HTTP REST call. |
| * |
| * <ul class='seealso'> |
| * <li class='jf'>{@link RestContext#REST_callHandler} |
| * </ul> |
| */ |
| public interface RestCallHandler { |
| |
| /** |
| * Represents no RestCallHandler. |
| * |
| * <p> |
| * Used on annotation to indicate that the value should be inherited from the parent class, and |
| * ultimately {@link BasicRestCallHandler} if not specified at any level. |
| */ |
| public interface Null extends RestCallHandler {} |
| |
| /** |
| * The main service method. |
| * |
| * @param r1 The incoming HTTP servlet request object. |
| * @param r2 The incoming HTTP servlet response object. |
| * @throws ServletException Error occurred. |
| * @throws IOException Thrown by underlying stream. |
| */ |
| public void service(HttpServletRequest r1, HttpServletResponse r2) throws ServletException, IOException; |
| |
| /** |
| * Wraps an incoming servlet request/response pair into a single {@link RestCall} object. |
| * |
| * @param req The rest request. |
| * @param res The rest response. |
| * @return The wrapped request/response pair. |
| */ |
| public RestCall createCall(HttpServletRequest req, HttpServletResponse res); |
| |
| /** |
| * Creates a {@link RestRequest} object based on the specified incoming {@link HttpServletRequest} object. |
| * |
| * @param call The current REST call. |
| * @return The wrapped request object. |
| * @throws ServletException If any errors occur trying to interpret the request. |
| */ |
| public RestRequest createRequest(RestCall call) throws ServletException; |
| |
| /** |
| * Creates a {@link RestResponse} object based on the specified incoming {@link HttpServletResponse} object |
| * and the request returned by {@link #createRequest(RestCall)}. |
| * |
| * @param call The current REST call. |
| * @return The wrapped response object. |
| * @throws ServletException If any errors occur trying to interpret the request or response. |
| */ |
| public RestResponse createResponse(RestCall call) throws ServletException; |
| |
| /** |
| * The main method for serializing POJOs passed in through the {@link RestResponse#setOutput(Object)} method or |
| * returned by the Java method. |
| * |
| * @param call The current REST call. |
| * @throws Exception Can be thrown if error occurred while handling response. |
| */ |
| public void handleResponse(RestCall call) throws Exception; |
| |
| /** |
| * Handle the case where a matching method was not found. |
| * |
| * @param call The current REST call. |
| * @throws Exception Can be thrown if error occurred while handling response. |
| */ |
| public void handleNotFound(RestCall call) throws Exception; |
| |
| /** |
| * Method for handling response errors. |
| * |
| * @param call The current REST call. |
| * @param e The exception that occurred. |
| * @throws Exception Can be thrown if error occurred while handling response. |
| */ |
| public void handleError(RestCall call, Throwable e) throws Exception; |
| |
| /** |
| * Method for converting thrown exceptions into other types before they are handled. |
| * |
| * @param t The thrown object. |
| * @return The converted thrown object. |
| */ |
| public Throwable convertThrowable(Throwable t); |
| |
| /** |
| * Returns the session objects for the specified request. |
| * |
| * @param req The REST request. |
| * @param res The REST response. |
| * @return The session objects for that request. |
| */ |
| public Map<String,Object> getSessionObjects(RestRequest req, RestResponse res); |
| } |