+ private static final boolean WINDOWS_OS = System.getProperty("os.name").toLowerCase().startsWith("win");
+ private static boolean isNativeInited = false;
+ private static Path tempDir = null; // where the embeeded libraries are unpacked before loading them
+
+ /** A static-only "class" don't need no constructor */
+ private NativeLib() {
+ throw new IllegalAccessError("Utility class");
+ }
+
+ /** Hidden debug main() function
+ *
+ * It is not the Main-Class defined in src/bindings/java/MANIFEST.in (org.simgrid.msg.Msg is),
+ * so it won't get executed by default. But that's helpful to debug linkage errors, if you
+ * know that it exists. It's used by cmake during the configure, to inform the user.
+ */
+ public static void main(String[] args) {
+ System.out.println("This jarfile searches the native code under: " +getPath());
+ }
+
+ /** Main function loading all the native classes that we need */
+ public static void nativeInit() {
+ if (isNativeInited)
+ return;
+
+ if (WINDOWS_OS)
+ NativeLib.nativeInit("winpthread-1");
+
+ NativeLib.nativeInit("simgrid");
+ NativeLib.nativeInit("simgrid-java");
+ isNativeInited = true;
+ }
+
+ /** Helper function trying to load one requested library */
+ public static void nativeInit(String name) {
+ Throwable cause = null;
+ try {
+ /* Prefer the version of the library bundled into the jar file and use it */
+ if (loadLibAsStream(name))
+ return;
+ } catch (UnsatisfiedLinkError|SecurityException|IOException e) {
+ cause = e;
+ }
+
+ /* If not found, try to see if we can find a version on disk */
+ try {
+ System.loadLibrary(name);
+ return;
+ } catch (UnsatisfiedLinkError systemException) { /* don't care */ }
+
+ System.err.println("\nCannot load the bindings to the "+name+" library in path "+getPath()+" and no usable SimGrid installation found on disk.");
+ if (cause != null) {
+ if (cause.getMessage().contains("libcgraph.so"))
+ System.err.println("HINT: Try to install the libcgraph package (sudo apt-get install libcgraph).");
+ else if (cause.getMessage().contains("libboost_context.so"))
+ System.err.println("HINT: Try to install the boost-context package (sudo apt-get install libboost-context-dev).");
+ else
+ System.err.println("Try to install the missing dependencies, if any. Read carefully the following error message.");
+
+ System.err.println();
+ cause.printStackTrace();
+ } else {
+ System.err.println("This jar file does not seem to fit your system, and no usable SimGrid installation found on disk for "+name+".");
+ }
+ System.exit(1);
+ }
+
+ /** Try to extract the library from the jarfile before loading it */
+ private static boolean loadLibAsStream (String name) throws IOException, UnsatisfiedLinkError {
+ String path = NativeLib.getPath();
+
+ // We must write the lib onto the disk before loading it -- stupid operating systems
+ if (tempDir == null) {
+ final String tempPrefix = "simgrid-java-";
+
+ if (WINDOWS_OS) {
+ // The cleanup at exit fails on Windows where it is impossible to delete files which are still in
+ // use. Try to remove stale temporary files from previous executions, and limit disk usage.
+ Path tmpdir = (new File(System.getProperty("java.io.tmpdir"))).toPath();
+ try (Stream<Path> paths = Files.find(tmpdir, 1,
+ (Path p, java.nio.file.attribute.BasicFileAttributes a) ->
+ a.isDirectory() && !p.equals(tmpdir) &&
+ p.getFileName().toString().startsWith(tempPrefix))) {
+ paths.map(Path::toFile)
+ .map(FileCleaner::new)
+ .forEach(FileCleaner::run);
+
+ }
+ }
+
+ tempDir = Files.createTempDirectory(tempPrefix);
+ // don't leak the files on disk, but remove it on JVM shutdown
+ Runtime.getRuntime().addShutdownHook(new Thread(new FileCleaner(tempDir.toFile())));
+ }
+
+ /* For each possible filename of the given library on all possible OSes, try it */
+ for (String filename : new String[]
+ { name,
+ "lib"+name+".so", /* linux */
+ name+".dll", "lib"+name+".dll", /* windows (pure and mingw) */
+ "lib"+name+".dylib" /* macOS */}) {
+
+ File fileOut = new File(tempDir.toFile(), filename);
+ try ( // Try-with-resources. These stream will be autoclosed when needed.
+ InputStream in = NativeLib.class.getClassLoader().getResourceAsStream(path+filename);
+ ) {
+ if (in != null) {
+ /* copy the library in position */
+ Files.copy(in, fileOut.toPath());
+
+ /* load that library */
+ System.load(fileOut.getAbsolutePath());
+
+ /* It loaded! we're good */
+ return true;
+ }
+ }
+ }
+
+ /* No suitable name found */
+ return false;
+ }