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 * ====================================================================
 * 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
 * .
 *
 */

package org.apache.hc.client5.http.impl;

import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.ConnectException;
import java.net.NoRouteToHostException;
import java.net.UnknownHostException;
import java.time.Instant;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import javax.net.ssl.SSLException;

import org.apache.hc.client5.http.HttpRequestRetryStrategy;
import org.apache.hc.client5.http.utils.DateUtils;
import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.ThreadingBehavior;
import org.apache.hc.core5.concurrent.CancellableDependency;
import org.apache.hc.core5.http.ConnectionClosedException;
import org.apache.hc.core5.http.Header;
import org.apache.hc.core5.http.HttpHeaders;
import org.apache.hc.core5.http.HttpRequest;
import org.apache.hc.core5.http.HttpResponse;
import org.apache.hc.core5.http.HttpStatus;
import org.apache.hc.core5.http.Method;
import org.apache.hc.core5.http.protocol.HttpContext;
import org.apache.hc.core5.util.Args;
import org.apache.hc.core5.util.TimeValue;

/**
 * Default implementation of the {@link HttpRequestRetryStrategy} interface.
 *
 * @since 5.0
 */
@Contract(threading = ThreadingBehavior.STATELESS)
public class DefaultHttpRequestRetryStrategy implements HttpRequestRetryStrategy {

    /**
     * Default instance of {@link DefaultHttpRequestRetryStrategy}.
     */
    public static final DefaultHttpRequestRetryStrategy INSTANCE = new DefaultHttpRequestRetryStrategy();

    /**
     * Maximum number of allowed retries
     */
    private final int maxRetries;

    /**
     * Retry interval between subsequent retries
     */
    private final TimeValue defaultRetryInterval;

    /**
     * Derived {@code IOExceptions} which shall not be retried
     */
    private final Set> nonRetriableIOExceptionClasses;

    /**
     * HTTP status codes which shall be retried
     */
    private final Set retriableCodes;

    protected DefaultHttpRequestRetryStrategy(
            final int maxRetries,
            final TimeValue defaultRetryInterval,
            final Collection> clazzes,
            final Collection codes) {
        Args.notNegative(maxRetries, "maxRetries");
        Args.notNegative(defaultRetryInterval.getDuration(), "defaultRetryInterval");
        this.maxRetries = maxRetries;
        this.defaultRetryInterval = defaultRetryInterval;
        this.nonRetriableIOExceptionClasses = new HashSet<>(clazzes);
        this.retriableCodes = new HashSet<>(codes);
    }

    /**
     * Create the HTTP request retry strategy using the following list of
     * non-retriable I/O exception classes:
*
    *
  • InterruptedIOException
  • *
  • UnknownHostException
  • *
  • ConnectException
  • *
  • ConnectionClosedException
  • *
  • NoRouteToHostException
  • *
  • SSLException
  • *
* * and retriable HTTP status codes:
*
    *
  • SC_TOO_MANY_REQUESTS (429)
  • *
  • SC_SERVICE_UNAVAILABLE (503)
  • *
* * @param maxRetries how many times to retry; 0 means no retries * @param defaultRetryInterval the default retry interval between * subsequent retries if the {@code Retry-After} header is not set * or invalid. */ public DefaultHttpRequestRetryStrategy( final int maxRetries, final TimeValue defaultRetryInterval) { this(maxRetries, defaultRetryInterval, Arrays.asList( InterruptedIOException.class, UnknownHostException.class, ConnectException.class, ConnectionClosedException.class, NoRouteToHostException.class, SSLException.class), Arrays.asList( HttpStatus.SC_TOO_MANY_REQUESTS, HttpStatus.SC_SERVICE_UNAVAILABLE)); } /** * Create the HTTP request retry strategy with a max retry count of 1, * default retry interval of 1 second, and using the following list of * non-retriable I/O exception classes:
*
    *
  • InterruptedIOException
  • *
  • UnknownHostException
  • *
  • ConnectException
  • *
  • ConnectionClosedException
  • *
  • SSLException
  • *
* * and retriable HTTP status codes:
*
    *
  • SC_TOO_MANY_REQUESTS (429)
  • *
  • SC_SERVICE_UNAVAILABLE (503)
  • *
*/ public DefaultHttpRequestRetryStrategy() { this(1, TimeValue.ofSeconds(1L)); } @Override public boolean retryRequest( final HttpRequest request, final IOException exception, final int execCount, final HttpContext context) { Args.notNull(request, "request"); Args.notNull(exception, "exception"); if (execCount > this.maxRetries) { // Do not retry if over max retries return false; } if (this.nonRetriableIOExceptionClasses.contains(exception.getClass())) { return false; } for (final Class rejectException : this.nonRetriableIOExceptionClasses) { if (rejectException.isInstance(exception)) { return false; } } if (request instanceof CancellableDependency && ((CancellableDependency) request).isCancelled()) { return false; } // Retry if the request is considered idempotent return handleAsIdempotent(request); } @Override public boolean retryRequest( final HttpResponse response, final int execCount, final HttpContext context) { Args.notNull(response, "response"); return execCount <= this.maxRetries && retriableCodes.contains(response.getCode()); } @Override public TimeValue getRetryInterval( final HttpResponse response, final int execCount, final HttpContext context) { Args.notNull(response, "response"); final Header header = response.getFirstHeader(HttpHeaders.RETRY_AFTER); TimeValue retryAfter = null; if (header != null) { final String value = header.getValue(); try { retryAfter = TimeValue.ofSeconds(Long.parseLong(value)); } catch (final NumberFormatException ignore) { final Instant retryAfterDate = DateUtils.parseStandardDate(value); if (retryAfterDate != null) { retryAfter = TimeValue.ofMilliseconds(retryAfterDate.toEpochMilli() - System.currentTimeMillis()); } } if (TimeValue.isPositive(retryAfter)) { return retryAfter; } } return this.defaultRetryInterval; } protected boolean handleAsIdempotent(final HttpRequest request) { return Method.isIdempotent(request.getMethod()); } }




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