| /* |
| * ==================================================================== |
| * 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.sync; |
| |
| import java.io.IOException; |
| import java.io.InterruptedIOException; |
| |
| import org.apache.hc.client5.http.impl.ExecSupport; |
| import org.apache.hc.client5.http.protocol.HttpClientContext; |
| import org.apache.hc.client5.http.sync.ExecChain; |
| import org.apache.hc.client5.http.sync.ExecChainHandler; |
| import org.apache.hc.client5.http.sync.ServiceUnavailableRetryStrategy; |
| import org.apache.hc.core5.annotation.Contract; |
| 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.HttpException; |
| import org.apache.hc.core5.util.Args; |
| import org.apache.logging.log4j.LogManager; |
| import org.apache.logging.log4j.Logger; |
| |
| /** |
| * Request executor in the request execution chain that is responsible |
| * for making a decision whether a request that received a non-2xx 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 4.3 |
| */ |
| @Contract(threading = ThreadingBehavior.IMMUTABLE_CONDITIONAL) |
| final class ServiceUnavailableRetryExec implements ExecChainHandler { |
| |
| private final Logger log = LogManager.getLogger(getClass()); |
| |
| private final ServiceUnavailableRetryStrategy retryStrategy; |
| |
| public ServiceUnavailableRetryExec( |
| final ServiceUnavailableRetryStrategy retryStrategy) { |
| super(); |
| Args.notNull(retryStrategy, "Retry strategy"); |
| this.retryStrategy = retryStrategy; |
| } |
| |
| @Override |
| public ClassicHttpResponse execute( |
| final ClassicHttpRequest request, |
| final ExecChain.Scope scope, |
| final ExecChain chain) throws IOException, HttpException { |
| Args.notNull(request, "HTTP request"); |
| Args.notNull(scope, "Scope"); |
| final HttpClientContext context = scope.clientContext; |
| ClassicHttpRequest currentRequest = request; |
| for (int c = 1;; c++) { |
| final ClassicHttpResponse response = chain.proceed(currentRequest, scope); |
| try { |
| if (this.retryStrategy.retryRequest(response, c, context)) { |
| response.close(); |
| final long nextInterval = this.retryStrategy.getRetryInterval(response, context); |
| if (nextInterval > 0) { |
| try { |
| if (this.log.isDebugEnabled()) { |
| this.log.debug("Wait for " + ((double) nextInterval / 1000) + " seconds" ); |
| } |
| Thread.sleep(nextInterval); |
| } catch (final InterruptedException e) { |
| Thread.currentThread().interrupt(); |
| throw new InterruptedIOException(); |
| } |
| } |
| currentRequest = ExecSupport.copy(scope.originalRequest); |
| } else { |
| return response; |
| } |
| } catch (final RuntimeException ex) { |
| response.close(); |
| throw ex; |
| } |
| } |
| } |
| |
| } |