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Async Http Client library purpose is to allow Java applications to easily execute HTTP requests and asynchronously process the HTTP responses.

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/*
 * Copyright (c) 2012-2015 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 com.ning.http.client.providers.grizzly;

import com.ning.http.client.Request;
import java.io.IOException;
import org.glassfish.grizzly.filterchain.FilterChainContext;
import org.glassfish.grizzly.http.HttpRequestPacket;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * @author Grizzly team
 */
abstract class PayloadGenerator {
    protected final static Logger LOGGER = LoggerFactory.getLogger(GrizzlyAsyncHttpProvider.class);

    public static int MAX_CHUNK_SIZE = 8192;

    public abstract boolean handlesPayloadType(final Request request);

    public abstract boolean generate(final FilterChainContext ctx,
            final Request request,
            final HttpRequestPacket requestPacket) throws IOException;

    /**
     * Tries to predict request content-length based on the {@link Request}.
     * Not all the PayloadGenerators can predict the content-length in
     * advance.
     *
     * @param request
     * @return the content-length, or -1 if the content-length
     * can't be predicted
     */
    protected long getContentLength(final Request request) {
        return request.getContentLength();
    }

    /**
     * The method is called, when server responses with 100-Continue
     * @param ctx
     * @throws java.io.IOException
     */
    public void continueConfirmed(final FilterChainContext ctx)
            throws IOException {
    }
    
} // END PayloadGenerator