/*
 * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, version 2.0, as published by the
 * Free Software Foundation.
 *
 * This program is also distributed with certain software (including but not
 * limited to OpenSSL) that is licensed under separate terms, as designated in a
 * particular file or component or in included license documentation. The
 * authors of MySQL hereby grant you an additional permission to link the
 * program and your derivative works with the separately licensed software that
 * they have included with MySQL.
 *
 * Without limiting anything contained in the foregoing, this file, which is
 * part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
 * version 1.0, a copy of which can be found at
 * http://oss.oracle.com/licenses/universal-foss-exception.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
 */

package com.mysql.cj.protocol;

import com.mysql.cj.exceptions.CJOperationNotSupportedException;
import com.mysql.cj.exceptions.ExceptionFactory;

/**
 * Sink for messages that are read asynchonously from the socket.
 *
 * Return whether the listener is done receiving messages.
 * 
 * @param <M>
 *            Message type
 */
public interface MessageListener<M extends Message> {

    /**
     * Process protocol message.
     * 
     * @param message
     *            {@link Message} instance
     * @return true - if this listener is done with processing the messages sequence and may be discarded;
     *         false - if the next message must be dispatched to the same listener
     */
    default boolean processMessage(M message) {
        throw ExceptionFactory.createException(CJOperationNotSupportedException.class, "Not allowed");
    }

    /**
     * Exceptionally complete underlying Future.
     * 
     * @param ex
     *            exception to pass to underlying Future.
     */
    void error(Throwable ex);
}
