httpclient5/src/main/java/org/apache/hc/client5/http/HttpRequestRetryHandler.java

/*
 * ====================================================================
 * 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
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 * <http://www.apache.org/>.
 *
 */

package org.apache.hc.client5.http;

import java.io.IOException;

import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.ThreadingBehavior;
import org.apache.hc.core5.http.HttpRequest;
import org.apache.hc.core5.http.protocol.HttpContext;

/**
 * A handler for determining if an HttpRequest should be retried after a
 * recoverable exception during execution.
 * <p>
 * Implementations of this interface must be thread-safe. Access to shared
 * data must be synchronized as methods of this interface may be executed
 * from multiple threads.
 *
 * @since 4.0
 */
@Contract(threading = ThreadingBehavior.STATELESS)
public interface HttpRequestRetryHandler {

    /**
     * Determines if a method should be retried after an IOException
     * occurs during execution.
     *
     * @param request request failed die to an I/O exception.
     * @param exception the exception that occurred
     * @param executionCount the number of times this method has been
     * unsuccessfully executed
     * @param context the context for the request execution
     *
     * @return {@code true} if the method should be retried, {@code false}
     * otherwise
     */
    boolean retryRequest(HttpRequest request, IOException exception, int executionCount, HttpContext context);

}