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Apache HttpComponents AsyncClient
There is a newer version: 4.1.5
/*
 * ====================================================================
 * 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
 * .
 *
 */
package org.apache.http.impl.nio.client;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Future;

import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.annotation.ThreadSafe;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.concurrent.FutureCallback;
import org.apache.http.nio.client.HttpPipeliningClient;
import org.apache.http.nio.client.methods.HttpAsyncMethods;
import org.apache.http.nio.protocol.HttpAsyncRequestProducer;
import org.apache.http.nio.protocol.HttpAsyncResponseConsumer;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.Args;

/**
 * Base implementation of {@link org.apache.http.nio.client.HttpPipeliningClient} that also
 * implements {@link java.io.Closeable}.
 *
 * @since 4.1
 */
@ThreadSafe
public abstract class CloseableHttpPipeliningClient
        extends CloseableHttpAsyncClient implements HttpPipeliningClient {

    @Override
    public  Future> execute(
            final HttpHost target,
            final List requestProducers,
            final List> responseConsumers,
            final FutureCallback> callback) {
        return execute(target, requestProducers, responseConsumers, HttpClientContext.create(), callback);
    }

    @Override
    public Future> execute(
            final HttpHost target,
            final List requests,
            final FutureCallback> callback) {
        return execute(target, requests, HttpClientContext.create(), callback);
    }

    @Override
    public Future> execute(
            final HttpHost target,
            final List requests,
            final HttpContext context,
            final FutureCallback> callback) {
        Args.notEmpty(requests, "HTTP request list");
        final List requestProducers = new ArrayList(
                requests.size());
        final List> responseConsumers = new ArrayList>(
                requests.size());
        for (int i = 0; i < requests.size(); i++) {
            final HttpRequest request = requests.get(i);
            requestProducers.add(HttpAsyncMethods.create(target, request));
            responseConsumers.add(HttpAsyncMethods.createConsumer());
        }
        return execute(target, requestProducers, responseConsumers, context, callback);
    }

}