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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  }