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