001/* 002 * ==================================================================== 003 * Licensed to the Apache Software Foundation (ASF) under one 004 * or more contributor license agreements. See the NOTICE file 005 * distributed with this work for additional information 006 * regarding copyright ownership. The ASF licenses this file 007 * to you under the Apache License, Version 2.0 (the 008 * "License"); you may not use this file except in compliance 009 * with the License. You may obtain a copy of the License at 010 * 011 * http://www.apache.org/licenses/LICENSE-2.0 012 * 013 * Unless required by applicable law or agreed to in writing, 014 * software distributed under the License is distributed on an 015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 016 * KIND, either express or implied. See the License for the 017 * specific language governing permissions and limitations 018 * under the License. 019 * ==================================================================== 020 * 021 * This software consists of voluntary contributions made by many 022 * individuals on behalf of the Apache Software Foundation. For more 023 * information on the Apache Software Foundation, please see 024 * <http://www.apache.org/>. 025 * 026 */ 027 028package org.apache.http.impl.client; 029 030import java.util.Locale; 031import java.util.Map; 032import java.util.concurrent.ConcurrentHashMap; 033 034import org.apache.http.HttpRequest; 035import org.apache.http.annotation.Contract; 036import org.apache.http.annotation.ThreadingBehavior; 037 038/** 039 * {@link org.apache.http.client.HttpRequestRetryHandler} which assumes 040 * that all requested HTTP methods which should be idempotent according 041 * to RFC-2616 are in fact idempotent and can be retried. 042 * <p> 043 * According to RFC-2616 section 9.1.2 the idempotent HTTP methods are: 044 * GET, HEAD, PUT, DELETE, OPTIONS, and TRACE 045 * </p> 046 * 047 * @since 4.2 048 */ 049@Contract(threading = ThreadingBehavior.IMMUTABLE) 050public class StandardHttpRequestRetryHandler extends DefaultHttpRequestRetryHandler { 051 052 private final Map<String, Boolean> idempotentMethods; 053 054 /** 055 * Default constructor 056 */ 057 public StandardHttpRequestRetryHandler(final int retryCount, final boolean requestSentRetryEnabled) { 058 super(retryCount, requestSentRetryEnabled); 059 this.idempotentMethods = new ConcurrentHashMap<String, Boolean>(); 060 this.idempotentMethods.put("GET", Boolean.TRUE); 061 this.idempotentMethods.put("HEAD", Boolean.TRUE); 062 this.idempotentMethods.put("PUT", Boolean.TRUE); 063 this.idempotentMethods.put("DELETE", Boolean.TRUE); 064 this.idempotentMethods.put("OPTIONS", Boolean.TRUE); 065 this.idempotentMethods.put("TRACE", Boolean.TRUE); 066 } 067 068 /** 069 * Default constructor 070 */ 071 public StandardHttpRequestRetryHandler() { 072 this(3, false); 073 } 074 075 @Override 076 protected boolean handleAsIdempotent(final HttpRequest request) { 077 final String method = request.getRequestLine().getMethod().toUpperCase(Locale.ROOT); 078 final Boolean b = this.idempotentMethods.get(method); 079 return b != null && b.booleanValue(); 080 } 081 082}