com.mysql.cj.protocol.MessageSender Maven / Gradle / Ivy

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JDBC Type 4 driver for MySQL
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/*
 * Copyright (c) 2015, 2018, 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 java.io.IOException;
import java.nio.channels.CompletionHandler;

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

/**
 * This interface provides a facility for sending messages to server. The destination, transmission method, etc are determined by the implementation.
 * 
 * @param 
 *            Message type
 */
public interface MessageSender {

    /**
     * Synchronously send the message to server.
     * 
     * @param message
     *            byte array containing a message
     * @param messageLen
     *            length of the message
     * @param messageSequence
     *            message sequence index (used in a native protocol)
     * @throws IOException
     *             if an error occurs
     */
    default void send(byte[] message, int messageLen, byte messageSequence) throws IOException {
        throw ExceptionFactory.createException(CJOperationNotSupportedException.class, "Not supported");
    }

    /**
     * Synchronously send the message to server.
     * 
     * @param message
     *            {@link Message} instance
     */
    default void send(M message) {
        throw ExceptionFactory.createException(CJOperationNotSupportedException.class, "Not supported");
    }

    /**
     * Asynchronously write a message with a notification being delivered to callback upon completion of write of entire message.
     *
     * @param message
     *            message extending {@link Message}
     * @param callback
     *            an optional callback to receive notification of when the message is completely written
     */
    default void send(M message, CompletionHandler callback) {
        throw ExceptionFactory.createException(CJOperationNotSupportedException.class, "Not supported");
    }

    /**
     * Set max allowed packet size.
     * 
     * @param maxAllowedPacket
     *            max allowed packet size
     */
    default void setMaxAllowedPacket(int maxAllowedPacket) {
        throw ExceptionFactory.createException(CJOperationNotSupportedException.class, "Not supported");
    }

    /**
     * Return a PacketSender instance free of decorators.
     * 
     * @return
     *         {@link MessageSender} instance
     */
    default MessageSender undecorateAll() {
        return this;
    }

    /**
     * Return the previous PacketSender instance from the decorators chain or the current PacketSender
     * if it is the first entry in a chain.
     * 
     * @return
     *         {@link MessageSender} instance
     */
    default MessageSender undecorate() {
        return this;
    }
}