Java tutorial
/* * ==================================================================== * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * */ package org.apache.http.impl.client; import java.util.Locale; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; import org.apache.http.HttpRequest; import org.apache.http.annotation.Immutable; /** * {@link org.apache.http.client.HttpRequestRetryHandler} which assumes * that all requested HTTP methods which should be idempotent according * to RFC-2616 are in fact idempotent and can be retried. * <p/> * According to RFC-2616 section 9.1.2 the idempotent HTTP methods are: * GET, HEAD, PUT, DELETE, OPTIONS, and TRACE * * @since 4.2 */ @Immutable public class StandardHttpRequestRetryHandler extends DefaultHttpRequestRetryHandler { private final Map<String, Boolean> idempotentMethods; /** * Default constructor */ public StandardHttpRequestRetryHandler(final int retryCount, final boolean requestSentRetryEnabled) { super(retryCount, requestSentRetryEnabled); this.idempotentMethods = new ConcurrentHashMap<String, Boolean>(); this.idempotentMethods.put("GET", Boolean.TRUE); this.idempotentMethods.put("HEAD", Boolean.TRUE); this.idempotentMethods.put("PUT", Boolean.TRUE); this.idempotentMethods.put("DELETE", Boolean.TRUE); this.idempotentMethods.put("OPTIONS", Boolean.TRUE); this.idempotentMethods.put("TRACE", Boolean.TRUE); } /** * Default constructor */ public StandardHttpRequestRetryHandler() { this(3, false); } @Override protected boolean handleAsIdempotent(final HttpRequest request) { final String method = request.getRequestLine().getMethod().toUpperCase(Locale.US); final Boolean b = this.idempotentMethods.get(method); return b != null && b.booleanValue(); } }