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JDBC Type 4 driver for MySQL.
There is a newer version: 9.1.0
/*
 * Copyright (c) 2012, 2024, Oracle and/or its affiliates.
 *
 * 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 designed to work with certain software 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 either included with the program or referenced in the documentation.
 *
 * 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.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class NetworkResources {

    private final Socket mysqlConnection;
    private final InputStream mysqlInput;
    private final OutputStream mysqlOutput;

    public NetworkResources(Socket mysqlConnection, InputStream mysqlInput, OutputStream mysqlOutput) {
        this.mysqlConnection = mysqlConnection;
        this.mysqlInput = mysqlInput;
        this.mysqlOutput = mysqlOutput;
    }

    /**
     * Forcibly closes the underlying socket to MySQL.
     */
    public final void forceClose() {
        try {
            if (!ExportControlled.isSSLEstablished(this.mysqlConnection)) { // Fix for Bug#56979 does not apply to secure sockets.
                try {
                    if (this.mysqlInput != null) {
                        this.mysqlInput.close();
                    }
                } finally {
                    if (this.mysqlConnection != null && !this.mysqlConnection.isClosed() && !this.mysqlConnection.isInputShutdown()) {
                        try {
                            this.mysqlConnection.shutdownInput();
                        } catch (UnsupportedOperationException e) {
                            // Ignore, some sockets do not support this method.
                        }
                    }
                }
            }
        } catch (IOException e) {
            // Can't do anything constructive about this.
        }

        try {
            if (!ExportControlled.isSSLEstablished(this.mysqlConnection)) { // Fix for Bug#56979 does not apply to secure sockets.
                try {
                    if (this.mysqlOutput != null) {
                        this.mysqlOutput.close();
                    }
                } finally {
                    if (this.mysqlConnection != null && !this.mysqlConnection.isClosed() && !this.mysqlConnection.isOutputShutdown()) {
                        try {
                            this.mysqlConnection.shutdownOutput();
                        } catch (UnsupportedOperationException e) {
                            // Ignore, some sockets do not support this method.
                        }
                    }
                }
            }
        } catch (IOException e) {
            // Can't do anything constructive about this.
        }

        try {
            if (this.mysqlConnection != null) {
                this.mysqlConnection.close();
            }
        } catch (IOException e) {
            // Can't do anything constructive about this.
        }
    }

}