/*
 * ====================================================================
 * 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.sync;

import java.io.IOException;

import org.apache.hc.core5.http.ClassicHttpRequest;
import org.apache.hc.core5.http.ClassicHttpResponse;
import org.apache.hc.core5.http.HttpException;

/**
 * This interface represents an element in the HTTP request execution chain. Each element can
 * either be a decorator around another element that implements a cross cutting aspect or
 * a self-contained executor capable of producing a response for the given request.
 * <p>
 * Important: please note it is required for decorators that implement post execution aspects
 * or response post-processing of any sort to release resources associated with the response
 * by calling {@link ClassicHttpResponse#close()} methods in case of an I/O, protocol or
 * runtime exception, or in case the response is not propagated to the caller.
 * </p>
 *
 * @since 4.3
 */
public interface ExecChainHandler {

    ClassicHttpResponse execute(
            ClassicHttpRequest request,
            ExecChain.Scope scope,
            ExecChain chain) throws IOException, HttpException;

}
