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[CONJ-360] factory implementation to avoid JNA class loading for ever…
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src/main/java/org/mariadb/jdbc/internal/util/JnaUtility.java
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src/main/java/org/mariadb/jdbc/internal/util/PidFactory.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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| /* | ||
| MariaDB Client for Java | ||
| Copyright (c) 2012-2014 Monty Program 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 info@montyprogram.com. | ||
| 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 com.sun.jna.platform.win32.Kernel32; | ||
|
|
||
| import java.lang.reflect.Method; | ||
|
|
||
| public class PidFactory { | ||
|
|
||
| public interface PidRequestInter { | ||
| String getPid(); | ||
| } | ||
|
|
||
| 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() { | ||
| return String.valueOf(Kernel32.INSTANCE.GetCurrentProcessId()); | ||
| } | ||
| }; | ||
|
|
||
| } | ||
| } | ||
| } 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; | ||
| } | ||
|
|
||
| private interface CLibrary extends Library { | ||
| CLibrary INSTANCE = (CLibrary) Native.loadLibrary("c", CLibrary.class); | ||
| int getpid(); | ||
| } | ||
| } | ||
|
|