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/**
 * Copyright (c) 2011-2013, ReXSL.com
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met: 1) Redistributions of source code must retain the above
 * copyright notice, this list of conditions and the following
 * disclaimer. 2) Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following
 * disclaimer in the documentation and/or other materials provided
 * with the distribution. 3) Neither the name of the ReXSL.com nor
 * the names of its contributors may be used to endorse or promote
 * products derived from this software without specific prior written
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.rexsl.maven.utils;

import com.jcabi.aspects.Loggable;
import com.jcabi.log.Logger;
import java.io.IOException;
import java.net.ServerSocket;

/**
 * Reserves a new TPC port.
 *
 * @author Yegor Bugayenko ([email protected])
 * @version $Id$
 */
public final class PortReserver {

    /**
     * Find and return the first available port.
     * @return The port number
     */
    @Loggable(Loggable.DEBUG)
    public int port() {
        int port;
        try {
            final ServerSocket socket = new ServerSocket(0);
            try {
                port = socket.getLocalPort();
            } finally {
                socket.close();
            }
        } catch (IOException ex) {
            throw new IllegalStateException("Failed to reserve port", ex);
        }
        Logger.info(this, "Port reserved: %d", port);
        return port;
    }

}