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package org.apache.http.impl.execchain;

import java.io.IOException;

import org.apache.http.HttpException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpExecutionAware;
import org.apache.http.client.methods.HttpRequestWrapper;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.conn.routing.HttpRoute;

/**
 * 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.
 * 

* 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 CloseableHttpResponse#close()} methods in case of an I/O, protocol or * runtime exception, or in case the response is not propagated to the caller. *

* * @since 4.3 */ public interface ClientExecChain { /** * Executes th request either by transmitting it to the target server or * by passing it onto the next executor in the request execution chain. * * @param route connection route. * @param request current request. * @param clientContext current HTTP context. * @param execAware receiver of notifications of blocking I/O operations. * @return HTTP response either received from the opposite endpoint * or generated locally. * @throws IOException in case of a I/O error. * (this type of exceptions are potentially recoverable). * @throws HttpException in case of an HTTP protocol error * (usually this type of exceptions are non-recoverable). */ CloseableHttpResponse execute( HttpRoute route, HttpRequestWrapper request, HttpClientContext clientContext, HttpExecutionAware execAware) throws IOException, HttpException; }




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