| /* |
| * ==================================================================== |
| * 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.hc.client5.http.impl.classic; |
| |
| import java.io.IOException; |
| import java.io.InterruptedIOException; |
| |
| import org.apache.hc.client5.http.HttpRequestRetryStrategy; |
| import org.apache.hc.client5.http.HttpRoute; |
| import org.apache.hc.client5.http.classic.ExecChain; |
| import org.apache.hc.client5.http.classic.ExecChain.Scope; |
| import org.apache.hc.client5.http.protocol.HttpClientContext; |
| import org.apache.hc.client5.http.classic.ExecChainHandler; |
| import org.apache.hc.core5.annotation.Contract; |
| import org.apache.hc.core5.annotation.Internal; |
| import org.apache.hc.core5.annotation.ThreadingBehavior; |
| import org.apache.hc.core5.http.ClassicHttpRequest; |
| import org.apache.hc.core5.http.ClassicHttpResponse; |
| import org.apache.hc.core5.http.HttpEntity; |
| import org.apache.hc.core5.http.HttpException; |
| import org.apache.hc.core5.http.NoHttpResponseException; |
| import org.apache.hc.core5.util.Args; |
| import org.apache.hc.core5.util.TimeValue; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Request executor in the request execution chain that is responsible for |
| * making a decision whether a request that failed due to an I/O exception |
| * or received a specific response from the target server should |
| * be re-executed. |
| * <p> |
| * Further responsibilities such as communication with the opposite |
| * endpoint is delegated to the next executor in the request execution |
| * chain. |
| * </p> |
| * |
| * @since 5.0 |
| */ |
| @Contract(threading = ThreadingBehavior.STATELESS) |
| @Internal |
| public class HttpRequestRetryExec implements ExecChainHandler { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(HttpRequestRetryExec.class); |
| |
| private final HttpRequestRetryStrategy retryStrategy; |
| |
| public HttpRequestRetryExec( |
| final HttpRequestRetryStrategy retryStrategy) { |
| Args.notNull(retryStrategy, "retryStrategy"); |
| this.retryStrategy = retryStrategy; |
| } |
| |
| @Override |
| public ClassicHttpResponse execute( |
| final ClassicHttpRequest request, |
| final Scope scope, |
| final ExecChain chain) throws IOException, HttpException { |
| Args.notNull(request, "request"); |
| Args.notNull(scope, "scope"); |
| final String exchangeId = scope.exchangeId; |
| final HttpRoute route = scope.route; |
| final HttpClientContext context = scope.clientContext; |
| ClassicHttpRequest currentRequest = request; |
| |
| for (int execCount = 1;; execCount++) { |
| final ClassicHttpResponse response; |
| try { |
| response = chain.proceed(currentRequest, scope); |
| } catch (final IOException ex) { |
| if (scope.execRuntime.isExecutionAborted()) { |
| throw new RequestFailedException("Request aborted"); |
| } |
| final HttpEntity requestEntity = request.getEntity(); |
| if (requestEntity != null && !requestEntity.isRepeatable()) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("{}: cannot retry non-repeatable request", exchangeId); |
| } |
| throw ex; |
| } |
| if (retryStrategy.retryRequest(request, ex, execCount, context)) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("{}: {}", exchangeId, ex.getMessage(), ex); |
| } |
| if (LOG.isInfoEnabled()) { |
| LOG.info("Recoverable I/O exception ({}) caught when processing request to {}", |
| ex.getClass().getName(), route); |
| } |
| currentRequest = ClassicRequestCopier.INSTANCE.copy(scope.originalRequest); |
| continue; |
| } else { |
| if (ex instanceof NoHttpResponseException) { |
| final NoHttpResponseException updatedex = new NoHttpResponseException( |
| route.getTargetHost().toHostString() + " failed to respond"); |
| updatedex.setStackTrace(ex.getStackTrace()); |
| throw updatedex; |
| } |
| throw ex; |
| } |
| } |
| |
| try { |
| final HttpEntity entity = request.getEntity(); |
| if (entity != null && !entity.isRepeatable()) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("{}: cannot retry non-repeatable request", exchangeId); |
| } |
| return response; |
| } |
| if (retryStrategy.retryRequest(response, execCount, context)) { |
| response.close(); |
| final TimeValue nextInterval = |
| retryStrategy.getRetryInterval(response, execCount, context); |
| if (TimeValue.isPositive(nextInterval)) { |
| try { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("{}: wait for {}", exchangeId, nextInterval); |
| } |
| nextInterval.sleep(); |
| } catch (final InterruptedException e) { |
| Thread.currentThread().interrupt(); |
| throw new InterruptedIOException(); |
| } |
| } |
| currentRequest = ClassicRequestCopier.INSTANCE.copy(scope.originalRequest); |
| } else { |
| return response; |
| } |
| } catch (final RuntimeException ex) { |
| response.close(); |
| throw ex; |
| } |
| } |
| } |
| |
| } |