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The Async Http Client (AHC) classes.
There is a newer version: 3.0.0
/*
 * Copyright (c) 2014 AsyncHttpClient Project. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package org.asynchttpclient.handler;

import io.netty.channel.Channel;

import java.net.InetSocketAddress;
import java.util.List;

import org.asynchttpclient.AsyncHandler;
import org.asynchttpclient.netty.request.NettyRequest;

/**
 * This interface hosts new low level callback methods on {@link AsyncHandler}.
 * 
 */
public interface AsyncHandlerExtensions {

    // ////////// DNS /////////////////

    /**
     * Notify the callback before hostname resolution
     * 
     * @param name the name to be resolved
     */
    void onHostnameResolutionAttempt(String name);

    /**
     * Notify the callback after hostname resolution was successful.
     * 
     * @param name the name to be resolved
     * @param addresses the resolved addresses
     */
    void onHostnameResolutionSuccess(String name, List addresses);

    /**
     * Notify the callback after hostname resolution failed.
     * 
     * @param name the name to be resolved
     * @param cause the failure cause
     */
    void onHostnameResolutionFailure(String name, Throwable cause);

    // ////////////// TCP CONNECT ////////

    /**
     * Notify the callback when trying to open a new connection.
     * 
     * Might be called several times if the name was resolved to multiple addresses and we failed to connect to the first(s) one(s).
     * 
     * @param remoteAddress the address we try to connect to
     */
    void onTcpConnectAttempt(InetSocketAddress remoteAddress);

    /**
     * Notify the callback after a successful connect
     * 
     * @param remoteAddress the address we try to connect to
     * @param connection the connection
     */
    void onTcpConnectSuccess(InetSocketAddress remoteAddress, Channel connection);

    /**
     * Notify the callback after a failed connect.
     * 
     * Might be called several times, or be followed by onTcpConnectSuccess when the name was resolved to multiple addresses.
     * 
     * @param remoteAddress the address we try to connect to
     * @param cause the cause of the failure
     */
    void onTcpConnectFailure(InetSocketAddress remoteAddress, Throwable cause);

    // ////////////// TLS ///////////////

    /**
     * Notify the callback before TLS handshake
     */
    void onTlsHandshakeAttempt();

    /**
     * Notify the callback after the TLS was successful
     */
    void onTlsHandshakeSuccess();

    /**
     * Notify the callback after the TLS failed
     * 
     * @param cause the cause of the failure
     */
    void onTlsHandshakeFailure(Throwable cause);

    // /////////// POOLING /////////////

    /**
     * Notify the callback when trying to fetch a connection from the pool.
     */
    void onConnectionPoolAttempt();

    /**
     * Notify the callback when a new connection was successfully fetched from the pool.
     * 
     * @param connection the connection
     */
    void onConnectionPooled(Channel connection);

    /**
     * Notify the callback when trying to offer a connection to the pool.
     * 
     * @param connection the connection
     */
    void onConnectionOffer(Channel connection);

    // //////////// SENDING //////////////

    /**
     * Notify the callback when a request is being written on the channel. If the original request causes multiple requests to be sent, for example, because of authorization or
     * retry, it will be notified multiple times.
     * 
     * @param request the real request object as passed to the provider
     */
    void onRequestSend(NettyRequest request);

    /**
     * Notify the callback every time a request is being retried.
     */
    void onRetry();
}