1 /* Copyright (c) 2014. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
9 import java.io.FileOutputStream;
10 import java.io.InputStream;
11 import java.io.OutputStream;
13 import java.nio.file.Files;
14 import java.nio.file.Path;
16 public final class NativeLib {
17 /* Statically load the library which contains all native functions used in here */
18 static private boolean isNativeInited = false;
19 public static void nativeInit() {
23 NativeLib.nativeInit("simgrid");
24 NativeLib.nativeInit("simgrid-java");
25 isNativeInited = true;
28 public static void nativeInit(String name) {
30 /* Prefer the version of the library bundled into the jar file and use it */
32 } catch (SimGridLibNotFoundException e) {
33 /* If not found, try to see if we can find a version on disk */
35 System.loadLibrary(name);
36 } catch (UnsatisfiedLinkError e2) {
37 if (! name.equals("boost_context")) {
38 System.err.println("Cannot load the bindings to the "+name+" library in path "+getPath());
40 System.err.println("This jar file does not seem to fit your system, and I cannot find an installation of SimGrid.");
47 public static String getPath() {
48 // Inspiration: https://github.com/xerial/snappy-java/blob/develop/src/main/java/org/xerial/snappy/OSInfo.java
49 String prefix = "NATIVE";
50 String os = System.getProperty("os.name");
51 String arch = System.getProperty("os.arch");
53 if (arch.matches("^i[3-6]86$"))
55 else if (arch.equalsIgnoreCase("x86_64"))
57 else if (arch.equalsIgnoreCase("AMD64"))
60 if (os.toLowerCase().startsWith("win")){
62 } else if (os.contains("OS X"))
65 os = os.replace(' ', '_');
66 arch = arch.replace(' ', '_');
68 return prefix + "/" + os + "/" + arch + "/";
70 static Path tempDir = null;
71 private static void loadLib (String name) throws SimGridLibNotFoundException {
72 String Path = NativeLib.getPath();
75 InputStream in = NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
78 filename = "lib"+name+".so";
79 in = NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
82 filename = name+".dll";
83 in = NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
86 filename = "lib"+name+".dll";
87 in = NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
90 filename = "lib"+name+".dylib";
91 in = NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
94 throw new SimGridLibNotFoundException("Cannot find library "+name+" in path "+Path+". Sorry, but this jar does not seem to be usable on your machine.");
97 // We must write the lib onto the disk before loading it -- stupid operating systems
98 if (tempDir == null) {
99 tempDir = Files.createTempDirectory("simgrid-java");
100 // don't leak the files on disk, but remove it on JVM shutdown
101 Runtime.getRuntime().addShutdownHook(new Thread(new FileCleaner(tempDir.toFile())));
103 File fileOut = new File(tempDir.toFile().getAbsolutePath() + File.separator + filename);
105 /* copy the library in position */
106 OutputStream out = new FileOutputStream(fileOut);
107 byte[] buffer = new byte[4096];
109 while ((bytes_read = in.read(buffer)) != -1) // Read until EOF
110 out.write(buffer, 0, bytes_read);
112 /* close all file descriptors, and load that shit */
115 System.load(fileOut.getAbsolutePath());
116 } catch (Exception e) {
117 System.err.println("Error while extracting the native library from the jar: ");
119 throw new SimGridLibNotFoundException("Cannot load the bindings to the "+name+" library in path "+getPath(), e);
123 /* A hackish mechanism used to remove the file containing our library when the JVM shuts down */
124 private static class FileCleaner implements Runnable {
126 public FileCleaner(File dir) {
131 for (File f : dir.listFiles())
134 } catch(Exception e) {
135 System.out.println("Unable to clean temporary file "+dir.getAbsolutePath()+" during shutdown.");
142 public static void main(String[] args) {
143 System.out.println("This jarfile searches the native code under: " +getPath());
147 class SimGridLibNotFoundException extends Exception {
148 private static final long serialVersionUID = 1L;
149 public SimGridLibNotFoundException(String msg) {
153 public SimGridLibNotFoundException(String msg, Exception e) {