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The Async Http Client (AHC) classes.
There is a newer version: 3.0.0
/*
 * Copyright (c) 2010-2012 Sonatype, Inc. 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.handler.codec.http.HttpHeaders;

import java.util.concurrent.ConcurrentLinkedQueue;

import org.asynchttpclient.AsyncCompletionHandlerBase;
import org.asynchttpclient.HttpResponseBodyPart;
import org.asynchttpclient.HttpResponseHeaders;
import org.asynchttpclient.Response;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A {@link org.asynchttpclient.AsyncHandler} that can be used to notify a set of {@link TransferListener}
 * 

 * 
 * 
 *  * AsyncHttpClient client = new AsyncHttpClient();
 * TransferCompletionHandler tl = new TransferCompletionHandler();
 * tl.addTransferListener(new TransferListener() {
 * 
 * public void onRequestHeadersSent(HttpHeaders headers) {
 * }
 * 
 * public void onResponseHeadersReceived(HttpHeaders headers) {
 * }
 * 
 * public void onBytesReceived(ByteBuffer buffer) {
 * }
 * 
 * public void onBytesSent(long amount, long current, long total) {
 * }
 * 
 * public void onRequestResponseCompleted() {
 * }
 * 
 * public void onThrowable(Throwable t) {
 * }
 * });
 * 
 * Response response = httpClient.prepareGet("http://...").execute(tl).get();
 * 
 * 
 * 
 */
public class TransferCompletionHandler extends AsyncCompletionHandlerBase {
    private final static Logger logger = LoggerFactory.getLogger(TransferCompletionHandler.class);
    private final ConcurrentLinkedQueue listeners = new ConcurrentLinkedQueue<>();
    private final boolean accumulateResponseBytes;
    private HttpHeaders headers;

    /**
     * Create a TransferCompletionHandler that will not accumulate bytes. The resulting {@link org.asynchttpclient.Response#getResponseBody()},
     * {@link org.asynchttpclient.Response#getResponseBodyAsStream()} will throw an IllegalStateException if called.
     */
    public TransferCompletionHandler() {
        this(false);
    }

    /**
     * Create a TransferCompletionHandler that can or cannot accumulate bytes and make it available when {@link org.asynchttpclient.Response#getResponseBody()} get called. The
     * default is false.
     * 
     * @param accumulateResponseBytes
     *            true to accumulates bytes in memory.
     */
    public TransferCompletionHandler(boolean accumulateResponseBytes) {
        this.accumulateResponseBytes = accumulateResponseBytes;
    }

    public TransferCompletionHandler addTransferListener(TransferListener t) {
        listeners.offer(t);
        return this;
    }

    public TransferCompletionHandler removeTransferListener(TransferListener t) {
        listeners.remove(t);
        return this;
    }

    public void headers(HttpHeaders headers) {
        this.headers = headers;
    }

    @Override
    public State onHeadersReceived(final HttpResponseHeaders headers) throws Exception {
        fireOnHeaderReceived(headers.getHeaders());
        return super.onHeadersReceived(headers);
    }

    @Override
    public State onBodyPartReceived(final HttpResponseBodyPart content) throws Exception {
        State s = State.CONTINUE;
        if (accumulateResponseBytes) {
            s = super.onBodyPartReceived(content);
        }
        fireOnBytesReceived(content.getBodyPartBytes());
        return s;
    }

    @Override
    public Response onCompleted(Response response) throws Exception {
        fireOnEnd();
        return response;
    }

    @Override
    public State onHeadersWritten() {
        if (headers != null) {
            fireOnHeadersSent(headers);
        }
        return State.CONTINUE;
    }

    @Override
    public State onContentWriteProgress(long amount, long current, long total) {
        fireOnBytesSent(amount, current, total);
        return State.CONTINUE;
    }

    @Override
    public void onThrowable(Throwable t) {
        fireOnThrowable(t);
    }

    private void fireOnHeadersSent(HttpHeaders headers) {
        for (TransferListener l : listeners) {
            try {
                l.onRequestHeadersSent(headers);
            } catch (Throwable t) {
                l.onThrowable(t);
            }
        }
    }

    private void fireOnHeaderReceived(HttpHeaders headers) {
        for (TransferListener l : listeners) {
            try {
                l.onResponseHeadersReceived(headers);
            } catch (Throwable t) {
                l.onThrowable(t);
            }
        }
    }

    private void fireOnEnd() {
        for (TransferListener l : listeners) {
            try {
                l.onRequestResponseCompleted();
            } catch (Throwable t) {
                l.onThrowable(t);
            }
        }
    }

    private void fireOnBytesReceived(byte[] b) {
        for (TransferListener l : listeners) {
            try {
                l.onBytesReceived(b);
            } catch (Throwable t) {
                l.onThrowable(t);
            }
        }
    }

    private void fireOnBytesSent(long amount, long current, long total) {
        for (TransferListener l : listeners) {
            try {
                l.onBytesSent(amount, current, total);
            } catch (Throwable t) {
                l.onThrowable(t);
            }
        }
    }

    private void fireOnThrowable(Throwable t) {
        for (TransferListener l : listeners) {
            try {
                l.onThrowable(t);
            } catch (Throwable t2) {
                logger.warn("onThrowable", t2);
            }
        }
    }
}