1 /**
2 *
3 * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com>
4 *
5 * ====================================================================
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 * ====================================================================
18 */
19 package org.jclouds.http;
20
21 /**
22 * Indicate whether a request should be retried after a server error response (HTTP status code >=
23 * 500) based on the request's replayable status and the number of attempts already performed.
24 *
25 * @author James Murty
26 */
27 public interface HttpRetryHandler {
28 public static final HttpRetryHandler ALWAYS_RETRY = new HttpRetryHandler() {
29 public boolean shouldRetryRequest(HttpCommand command, HttpResponse response) {
30 return true;
31 }
32
33 @Override
34 public String toString() {
35 return "ALWAYS_RETRY";
36 }
37 };
38
39 public static final HttpRetryHandler NEVER_RETRY = new HttpRetryHandler() {
40 public boolean shouldRetryRequest(HttpCommand command, HttpResponse response) {
41 return false;
42 }
43
44 @Override
45 public String toString() {
46 return "NEVER_RETRY";
47 }
48 };
49
50 /**
51 * Return true if the command should be retried. This method should only be invoked when the
52 * response has failed with a HTTP 5xx error indicating a server-side error.
53 */
54 boolean shouldRetryRequest(HttpCommand command, HttpResponse response);
55 }