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Apache HttpComponents Client
/*
* ====================================================================
* 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
*
* Further responsibilities such as communication with the opposite
* endpoint is delegated to the next executor in the request execution
* chain.
*
*
* @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 = ClassicRequestBuilder.copy(scope.originalRequest).build();
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)) {
final TimeValue nextInterval = retryStrategy.getRetryInterval(response, execCount, context);
// Make sure the retry interval does not exceed the response timeout
if (TimeValue.isPositive(nextInterval)) {
final RequestConfig requestConfig = context.getRequestConfig();
final Timeout responseTimeout = requestConfig.getResponseTimeout();
if (responseTimeout != null && nextInterval.compareTo(responseTimeout) > 0) {
return response;
}
}
response.close();
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 = ClassicRequestBuilder.copy(scope.originalRequest).build();
} else {
return response;
}
} catch (final RuntimeException ex) {
response.close();
throw ex;
}
}
}
}