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Posted to dev@hc.apache.org by GitBox <gi...@apache.org> on 2019/12/06 14:54:49 UTC
[GitHub] [httpcomponents-client] michael-o commented on a change in pull
request #179: WIP: HTTPCLIENT-2034: Introduce HttpRequestRetryStrategy
michael-o commented on a change in pull request #179: WIP: HTTPCLIENT-2034: Introduce HttpRequestRetryStrategy
URL: https://github.com/apache/httpcomponents-client/pull/179#discussion_r354870786
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File path: httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/AsyncHttpRequestRetryExec.java
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@@ -0,0 +1,177 @@
+/*
+ * ====================================================================
+ * 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 java.io.InterruptedIOException;
+
+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.impl.RequestCopier;
+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.util.Args;
+import org.apache.hc.core5.util.TimeValue;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Request executor in the asynchronou srequest execution chain that is
+ * responsible for making a decision whether a request than failed due to
+ * an I/O error or received 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 final class AsyncHttpRequestRetryExec implements AsyncExecChainHandler {
+
+ private final Logger log = LoggerFactory.getLogger(getClass());
+
+ private final HttpRequestRetryStrategy retryStrategy;
+
+ public AsyncHttpRequestRetryExec(final HttpRequestRetryStrategy retryStrategy) {
+ Args.notNull(retryStrategy, "retryStrategy");
+ this.retryStrategy = retryStrategy;
+ }
+
+ private void internalExecute(
+ final int execCount,
+ 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(RequestCopier.INSTANCE.copy(request), entityProducer, scope, new AsyncExecCallback() {
+
+ @Override
+ public AsyncDataConsumer handleResponse(
+ final HttpResponse response,
+ final EntityDetails entityDetails) throws HttpException, IOException {
+ final HttpClientContext clientContext = scope.clientContext;
+ try {
+ if (entityProducer != null && !entityProducer.isRepeatable()) {
+ log.debug("{}: cannot retry non-repeatable request", exchangeId);
+ return asyncExecCallback.handleResponse(response, entityDetails);
+ }
+ if (retryStrategy.retryRequest(response, execCount, clientContext)) {
+ // TODO What to do here?
+ //response.close();
+ final TimeValue nextInterval =
+ retryStrategy.getRetryInterval(response, execCount, clientContext);
+ if (TimeValue.isPositive(nextInterval)) {
+ try {
+ log.debug("{}: wait for {}", exchangeId, nextInterval);
Review comment:
Sorry, what objects? both `exchangeId` and `nextInterval` already exist. SLF4J will only send the log message to the underlying framwork if debug is actually enabled. From my understanding `is..Enabled()` is redundant here. Am I wrong?
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