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.http.impl.client;
28
29 import java.net.ConnectException;
30 import java.net.SocketTimeoutException;
31
32 import org.apache.http.HttpResponse;
33 import org.apache.http.HttpStatus;
34 import org.apache.http.client.ConnectionBackoffStrategy;
35
36 /**
37 * This {@link ConnectionBackoffStrategy} backs off either for a raw
38 * network socket or connection timeout or if the server explicitly
39 * sends a 503 (Service Unavailable) response.
40 *
41 * @since 4.2
42 */
43 public class DefaultBackoffStrategy implements ConnectionBackoffStrategy {
44
45 public boolean shouldBackoff(final Throwable t) {
46 return (t instanceof SocketTimeoutException
47 || t instanceof ConnectException);
48 }
49
50 public boolean shouldBackoff(final HttpResponse resp) {
51 return (resp.getStatusLine().getStatusCode() == HttpStatus.SC_SERVICE_UNAVAILABLE);
52 }
53
54 }