net.jpountz.util.Native Maven / Gradle / Ivy
package net.jpountz.util;
/*
* Copyright 2020 Adrien Grand and the lz4-java contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.FilenameFilter;
/** FOR INTERNAL USE ONLY */
public enum Native {
;
private enum OS {
// Even on Windows, the default compiler from cpptasks (gcc) uses .so as a shared lib extension
WINDOWS("win32", "so"), LINUX("linux", "so"), MAC("darwin", "dylib"), SOLARIS("solaris", "so");
public final String name, libExtension;
private OS(String name, String libExtension) {
this.name = name;
this.libExtension = libExtension;
}
}
private static String arch() {
return System.getProperty("os.arch");
}
private static OS os() {
String osName = System.getProperty("os.name");
if (osName.contains("Linux")) {
return OS.LINUX;
} else if (osName.contains("Mac")) {
return OS.MAC;
} else if (osName.contains("Windows")) {
return OS.WINDOWS;
} else if (osName.contains("Solaris") || osName.contains("SunOS")) {
return OS.SOLARIS;
} else {
throw new UnsupportedOperationException("Unsupported operating system: "
+ osName);
}
}
private static String resourceName() {
OS os = os();
String packagePrefix = Native.class.getPackage().getName().replace('.', '/');
return "/" + packagePrefix + "/" + os.name + "/" + arch() + "/liblz4-java." + os.libExtension;
}
private static boolean loaded = false;
public static synchronized boolean isLoaded() {
return loaded;
}
private static void cleanupOldTempLibs() {
String tempFolder = new File(System.getProperty("java.io.tmpdir")).getAbsolutePath();
File dir = new File(tempFolder);
File[] tempLibFiles = dir.listFiles(new FilenameFilter() {
private final String searchPattern = "liblz4-java-";
public boolean accept(File dir, String name) {
return name.startsWith(searchPattern) && !name.endsWith(".lck");
}
});
if(tempLibFiles != null) {
for(File tempLibFile : tempLibFiles) {
File lckFile = new File(tempLibFile.getAbsolutePath() + ".lck");
if(!lckFile.exists()) {
try {
tempLibFile.delete();
}
catch(SecurityException e) {
System.err.println("Failed to delete old temp lib" + e.getMessage());
}
}
}
}
}
public static synchronized void load() {
if (loaded) {
return;
}
cleanupOldTempLibs();
// Try to load lz4-java (liblz4-java.so on Linux) from the java.library.path.
try {
System.loadLibrary("lz4-java");
loaded = true;
return;
} catch (UnsatisfiedLinkError ex) {
// Doesn't exist, so proceed to loading bundled library.
}
String resourceName = resourceName();
InputStream is = Native.class.getResourceAsStream(resourceName);
if (is == null) {
throw new UnsupportedOperationException("Unsupported OS/arch, cannot find " + resourceName + ". Please try building from source.");
}
File tempLib = null;
File tempLibLock = null;
try {
// Create the .lck file first to avoid a race condition
// with other concurrently running Java processes using lz4-java.
tempLibLock = File.createTempFile("liblz4-java-", "." + os().libExtension + ".lck");
tempLib = new File(tempLibLock.getAbsolutePath().replaceFirst(".lck$", ""));
// copy to tempLib
try (FileOutputStream out = new FileOutputStream(tempLib)) {
byte[] buf = new byte[4096];
while (true) {
int read = is.read(buf);
if (read == -1) {
break;
}
out.write(buf, 0, read);
}
}
System.load(tempLib.getAbsolutePath());
loaded = true;
} catch (IOException e) {
throw new ExceptionInInitializerError("Cannot unpack liblz4-java: " + e);
} finally {
if (!loaded) {
if (tempLib != null && tempLib.exists()) {
if (!tempLib.delete()) {
throw new ExceptionInInitializerError("Cannot unpack liblz4-java / cannot delete a temporary native library " + tempLib);
}
}
if (tempLibLock != null && tempLibLock.exists()) {
if (!tempLibLock.delete()) {
throw new ExceptionInInitializerError("Cannot unpack liblz4-java / cannot delete a temporary lock file " + tempLibLock);
}
}
} else {
final String keepEnv = System.getenv("LZ4JAVA_KEEP_TEMP_JNI_LIB");
final String keepProp = System.getProperty("lz4java.jnilib.temp.keep");
if ((keepEnv == null || !keepEnv.equals("true")) &&
(keepProp == null || !keepProp.equals("true")))
tempLib.deleteOnExit();
tempLibLock.deleteOnExit();
}
}
}
}