com.mysql.jdbc.NetworkResources Maven / Gradle / Ivy

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MySQL JDBC Type 4 driver
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/*
  Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.

  The MySQL Connector/J is licensed under the terms of the GPLv2
  , like most MySQL Connectors.
  There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
  this software, see the FOSS License Exception
  .

  This program is free software; you can redistribute it and/or modify it under the terms
  of the GNU General Public License as published by the Free Software Foundation; version 2
  of the License.

  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 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.jdbc;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

class NetworkResources {
    private final Socket mysqlConnection;
    private final InputStream mysqlInput;
    private final OutputStream mysqlOutput;

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

    /**
     * Forcibly closes the underlying socket to MySQL.
     */
    protected 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.
        }
    }
}