| package org.apache.maven.wagon.shared.http; |
| |
| /* |
| * 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. |
| */ |
| |
| import org.apache.http.HttpResponse; |
| import org.apache.http.HttpStatus; |
| import org.apache.http.annotation.Contract; |
| import org.apache.http.annotation.ThreadingBehavior; |
| import org.apache.http.client.ServiceUnavailableRetryStrategy; |
| import org.apache.http.protocol.HttpContext; |
| import org.apache.http.util.Args; |
| |
| /** |
| * An implementation of the {@link ServiceUnavailableRetryStrategy} interface. |
| * that retries {@code 408} (Request Timeout), {@code 429} (Too Many Requests), |
| * and {@code 500} (Server side error) responses for a fixed number of times at a fixed interval. |
| */ |
| @Contract( threading = ThreadingBehavior.IMMUTABLE ) |
| public class StandardServiceUnavailableRetryStrategy implements ServiceUnavailableRetryStrategy |
| { |
| /** |
| * Maximum number of allowed retries if the server responds with a HTTP code |
| * in our retry code list. |
| */ |
| private final int maxRetries; |
| |
| /** |
| * Retry interval between subsequent requests, in milliseconds. |
| */ |
| private final long retryInterval; |
| |
| public StandardServiceUnavailableRetryStrategy( final int maxRetries, final int retryInterval ) |
| { |
| super(); |
| Args.positive( maxRetries, "Max retries" ); |
| Args.positive( retryInterval, "Retry interval" ); |
| this.maxRetries = maxRetries; |
| this.retryInterval = retryInterval; |
| } |
| |
| @Override |
| public boolean retryRequest( final HttpResponse response, final int executionCount, final HttpContext context ) |
| { |
| int statusCode = response.getStatusLine().getStatusCode(); |
| boolean retryableStatusCode = statusCode == HttpStatus.SC_REQUEST_TIMEOUT |
| // Too Many Requests ("standard" rate-limiting) |
| || statusCode == AbstractHttpClientWagon.SC_TOO_MANY_REQUESTS |
| // Assume server errors are momentary hiccups |
| || statusCode == HttpStatus.SC_INTERNAL_SERVER_ERROR |
| || statusCode == HttpStatus.SC_BAD_GATEWAY |
| || statusCode == HttpStatus.SC_SERVICE_UNAVAILABLE |
| || statusCode == HttpStatus.SC_GATEWAY_TIMEOUT; |
| return executionCount <= maxRetries && retryableStatusCode; |
| } |
| |
| @Override |
| public long getRetryInterval() |
| { |
| return retryInterval; |
| } |
| |
| } |