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. */ package org.apache.olingo.samples.client.core.http; import java.io.IOException; import java.io.InterruptedIOException; import java.net.ConnectException; import java.net.URI; import java.net.UnknownHostException; import javax.net.ssl.SSLException; import org.apache.http.HttpEntityEnclosingRequest; import org.apache.http.HttpRequest; import org.apache.http.client.HttpRequestRetryHandler; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.protocol.ExecutionContext; import org.apache.http.protocol.HttpContext; import org.apache.olingo.commons.api.http.HttpMethod; import org.apache.olingo.client.core.http.DefaultHttpClientFactory; /** * Shows how to install a custom exception recovery mechanism. * <a * href="http://svn.apache.org/repos/asf/httpcomponents/site/httpcomponents-client-4.2.x/tutorial/html/fundamentals.html#d5e281">More * information</a>. */ public class RequestRetryHttpClientFactory extends DefaultHttpClientFactory { @Override public DefaultHttpClient create(final HttpMethod method, final URI uri) { final HttpRequestRetryHandler myRetryHandler = new HttpRequestRetryHandler() { @Override public boolean retryRequest(final IOException exception, final int executionCount, final HttpContext context) { if (executionCount >= 5) { // Do not retry if over max retry count return false; } if (exception instanceof InterruptedIOException) { // Timeout return false; } if (exception instanceof UnknownHostException) { // Unknown host return false; } if (exception instanceof ConnectException) { // Connection refused return false; } if (exception instanceof SSLException) { // SSL handshake exception return false; } final HttpRequest request = (HttpRequest) context.getAttribute(ExecutionContext.HTTP_REQUEST); boolean idempotent = !(request instanceof HttpEntityEnclosingRequest); if (idempotent) { // Retry if the request is considered idempotent return true; } return false; } }; final DefaultHttpClient httpClient = super.create(method, uri); httpClient.setHttpRequestRetryHandler(myRetryHandler); return httpClient; } }