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 }