| /* |
| * ==================================================================== |
| * 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.async; |
| |
| import java.io.IOException; |
| |
| import org.apache.hc.client5.http.HttpRequestRetryStrategy; |
| import org.apache.hc.client5.http.HttpRoute; |
| import org.apache.hc.client5.http.async.AsyncExecCallback; |
| import org.apache.hc.client5.http.async.AsyncExecChain; |
| import org.apache.hc.client5.http.async.AsyncExecChainHandler; |
| import org.apache.hc.client5.http.protocol.HttpClientContext; |
| 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.EntityDetails; |
| import org.apache.hc.core5.http.HttpException; |
| import org.apache.hc.core5.http.HttpRequest; |
| import org.apache.hc.core5.http.HttpResponse; |
| import org.apache.hc.core5.http.nio.AsyncDataConsumer; |
| import org.apache.hc.core5.http.nio.AsyncEntityProducer; |
| import org.apache.hc.core5.http.nio.entity.NoopEntityConsumer; |
| import org.apache.hc.core5.http.support.BasicRequestBuilder; |
| import org.apache.hc.core5.util.Args; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Request executor in the asynchronous 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. Note that this exec chain handler <em>will not</em> respect |
| * {@link HttpRequestRetryStrategy#getRetryInterval(HttpResponse, int, org.apache.hc.core5.http.protocol.HttpContext)}. |
| * <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 final class AsyncHttpRequestRetryExec implements AsyncExecChainHandler { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(AsyncHttpRequestRetryExec.class); |
| |
| private final HttpRequestRetryStrategy retryStrategy; |
| |
| public AsyncHttpRequestRetryExec(final HttpRequestRetryStrategy retryStrategy) { |
| Args.notNull(retryStrategy, "retryStrategy"); |
| this.retryStrategy = retryStrategy; |
| } |
| |
| private static class State { |
| |
| volatile int execCount; |
| volatile boolean retrying; |
| |
| } |
| |
| private void internalExecute( |
| final State state, |
| final HttpRequest request, |
| final AsyncEntityProducer entityProducer, |
| final AsyncExecChain.Scope scope, |
| final AsyncExecChain chain, |
| final AsyncExecCallback asyncExecCallback) throws HttpException, IOException { |
| |
| final String exchangeId = scope.exchangeId; |
| |
| chain.proceed(BasicRequestBuilder.copy(request).build(), entityProducer, scope, new AsyncExecCallback() { |
| |
| @Override |
| public AsyncDataConsumer handleResponse( |
| final HttpResponse response, |
| final EntityDetails entityDetails) throws HttpException, IOException { |
| final HttpClientContext clientContext = scope.clientContext; |
| if (entityProducer != null && !entityProducer.isRepeatable()) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("{} cannot retry non-repeatable request", exchangeId); |
| } |
| return asyncExecCallback.handleResponse(response, entityDetails); |
| } |
| state.retrying = retryStrategy.retryRequest(response, state.execCount, clientContext); |
| if (state.retrying) { |
| return new NoopEntityConsumer(); |
| } else { |
| return asyncExecCallback.handleResponse(response, entityDetails); |
| } |
| } |
| |
| @Override |
| public void handleInformationResponse(final HttpResponse response) throws HttpException, IOException { |
| asyncExecCallback.handleInformationResponse(response); |
| } |
| |
| @Override |
| public void completed() { |
| if (state.retrying) { |
| state.execCount++; |
| try { |
| internalExecute(state, request, entityProducer, scope, chain, asyncExecCallback); |
| } catch (final IOException | HttpException ex) { |
| asyncExecCallback.failed(ex); |
| } |
| } else { |
| asyncExecCallback.completed(); |
| } |
| } |
| |
| @Override |
| public void failed(final Exception cause) { |
| if (cause instanceof IOException) { |
| final HttpRoute route = scope.route; |
| final HttpClientContext clientContext = scope.clientContext; |
| if (entityProducer != null && !entityProducer.isRepeatable()) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("{} cannot retry non-repeatable request", exchangeId); |
| } |
| } else if (retryStrategy.retryRequest(request, (IOException) cause, state.execCount, clientContext)) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("{} {}", exchangeId, cause.getMessage(), cause); |
| } |
| if (LOG.isInfoEnabled()) { |
| LOG.info("Recoverable I/O exception ({}) caught when processing request to {}", |
| cause.getClass().getName(), route); |
| } |
| scope.execRuntime.discardEndpoint(); |
| if (entityProducer != null) { |
| entityProducer.releaseResources(); |
| } |
| state.retrying = true; |
| state.execCount++; |
| try { |
| internalExecute(state, request, entityProducer, scope, chain, asyncExecCallback); |
| } catch (final IOException | HttpException ex) { |
| asyncExecCallback.failed(ex); |
| } |
| return; |
| } |
| } |
| asyncExecCallback.failed(cause); |
| } |
| |
| }); |
| |
| } |
| |
| @Override |
| public void execute( |
| final HttpRequest request, |
| final AsyncEntityProducer entityProducer, |
| final AsyncExecChain.Scope scope, |
| final AsyncExecChain chain, |
| final AsyncExecCallback asyncExecCallback) throws HttpException, IOException { |
| final State state = new State(); |
| state.execCount = 1; |
| state.retrying = false; |
| internalExecute(state, request, entityProducer, scope, chain, asyncExecCallback); |
| } |
| |
| } |