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JDBC driver for MariaDB and MySQL for java 7
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/*
*
* MariaDB Client for Java
*
* Copyright (c) 2012-2014 Monty Program Ab.
* Copyright (c) 2015-2017 MariaDB Ab.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This library 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License along
* with this library; if not, write to Monty Program Ab [email protected].
*
* This particular MariaDB Client for Java file is work
* derived from a Drizzle-JDBC. Drizzle-JDBC file which is covered by subject to
* the following copyright and notice provisions:
*
* Copyright (c) 2009-2011, Marcus Eriksson
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this list
* of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of the driver nor the names of its contributors may not 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 org.mariadb.jdbc.internal.util;
import com.sun.jna.Library;
import com.sun.jna.Native;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
public class PidFactory {
private static PidRequestInter pidRequest = null;
/**
* Factory method to avoid loading JNA classes every connection.
*
* @return factory that implement PID according to environment.
*/
public static PidRequestInter getInstance() {
if (pidRequest == null) {
synchronized (PidFactory.class) {
// check again within synchronized block to guard for race condition
if (pidRequest == null) {
//initialize JNA methods
try {
Class platformClass = Class.forName("com.sun.jna.Platform");
@SuppressWarnings("unchecked")
Method isLinuxMethod = platformClass.getMethod("isLinux");
Boolean isLinux = (Boolean) isLinuxMethod.invoke(platformClass);
if (isLinux.booleanValue()) {
//Linux pid implementation
pidRequest = new PidRequestInter() {
@Override
public String getPid() {
return String.valueOf(CLibrary.INSTANCE.getpid());
}
};
} else {
@SuppressWarnings("unchecked")
Method isWindowsMethod = platformClass.getMethod("isWindows");
Boolean isWindows = (Boolean) isWindowsMethod.invoke(platformClass);
if (isWindows.booleanValue()) {
//Windows pid implementation
pidRequest = new PidRequestInter() {
@Override
public String getPid() {
try {
Class kernel32Class = Class.forName("com.sun.jna.platform.win32.Kernel32");
Field field = kernel32Class.getField("INSTANCE");
Object fieldinstance = field.get(kernel32Class);
Method getCurrentProcessIdMethod = fieldinstance.getClass().getMethod("GetCurrentProcessId");
return String.valueOf(getCurrentProcessIdMethod.invoke(fieldinstance));
} catch (Throwable cle) {
//jna plateform jar's are not in classpath, no PID returned
}
return null;
}
};
}
}
} catch (Exception cle) {
//jna jar's are not in classpath, no PID returned
}
//No JNA, or environment not Linux/windows -> return no PID
if (pidRequest == null) {
pidRequest = new PidRequestInter() {
@Override
public String getPid() {
return null;
}
};
}
}
}
}
return pidRequest;
}
public interface PidRequestInter {
String getPid();
}
private interface CLibrary extends Library {
CLibrary INSTANCE = (CLibrary) Native.loadLibrary("c", CLibrary.class);
int getpid();
}
}