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/*
 * ====================================================================
 * 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.hc.client5.http.impl.nio;

import java.net.SocketAddress;
import java.util.concurrent.Future;

import org.apache.hc.client5.http.DnsResolver;
import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.ThreadingBehavior;
import org.apache.hc.core5.concurrent.FutureCallback;
import org.apache.hc.core5.net.NamedEndpoint;
import org.apache.hc.core5.reactor.ConnectionInitiator;
import org.apache.hc.core5.reactor.IOSession;
import org.apache.hc.core5.util.Args;
import org.apache.hc.core5.util.Timeout;

/**
 * Multi-home DNS aware implementation of {@link ConnectionInitiator}.
 *
 * @since 5.0
 */
@Contract(threading = ThreadingBehavior.SAFE_CONDITIONAL)
public final class MultihomeConnectionInitiator implements ConnectionInitiator {

    private final ConnectionInitiator connectionInitiator;
    private final MultihomeIOSessionRequester sessionRequester;

    public MultihomeConnectionInitiator(
            final ConnectionInitiator connectionInitiator,
            final DnsResolver dnsResolver) {
        this.connectionInitiator = Args.notNull(connectionInitiator, "Connection initiator");
        this.sessionRequester = new MultihomeIOSessionRequester(dnsResolver);
    }

    @Override
    public Future connect(
            final NamedEndpoint remoteEndpoint,
            final SocketAddress remoteAddress,
            final SocketAddress localAddress,
            final Timeout connectTimeout,
            final Object attachment,
            final FutureCallback callback) {
        Args.notNull(remoteEndpoint, "Remote endpoint");
        return sessionRequester.connect(connectionInitiator, remoteEndpoint, remoteAddress, localAddress, connectTimeout, attachment, callback);
    }

    public Future connect(
            final NamedEndpoint remoteEndpoint,
            final SocketAddress localAddress,
            final Timeout connectTimeout,
            final Object attachment,
            final FutureCallback callback) {
        Args.notNull(remoteEndpoint, "Remote endpoint");
        return sessionRequester.connect(connectionInitiator, remoteEndpoint, localAddress, connectTimeout, attachment, callback);
    }

}