1 /*
2 * ====================================================================
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 * ====================================================================
20 *
21 * This software consists of voluntary contributions made by many
22 * individuals on behalf of the Apache Software Foundation. For more
23 * information on the Apache Software Foundation, please see
24 * <http://www.apache.org/>.
25 *
26 */
27 package org.apache.hc.client5.http.impl.classic;
28
29 import java.net.ConnectException;
30 import java.net.SocketTimeoutException;
31
32 import org.apache.hc.client5.http.classic.ConnectionBackoffStrategy;
33 import org.apache.hc.core5.annotation.Experimental;
34 import org.apache.hc.core5.http.HttpResponse;
35 import org.apache.hc.core5.http.HttpStatus;
36
37 /**
38 * This {@link ConnectionBackoffStrategy} backs off either for a raw
39 * network socket or connection timeout or if the server explicitly
40 * sends a 429 (Too Many Requests) or a 503 (Service Unavailable) response.
41 *
42 * @since 4.2
43 */
44 @Experimental
45 public class DefaultBackoffStrategy implements ConnectionBackoffStrategy {
46
47 @Override
48 public boolean shouldBackoff(final Throwable t) {
49 return t instanceof SocketTimeoutException || t instanceof ConnectException;
50 }
51
52 @Override
53 public boolean shouldBackoff(final HttpResponse response) {
54 return response.getCode() == HttpStatus.SC_TOO_MANY_REQUESTS ||
55 response.getCode() == HttpStatus.SC_SERVICE_UNAVAILABLE;
56 }
57
58 }