package org.simgrid.msg;
+import java.io.FileOutputStream;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.File;
+
+
public final class Msg {
/* Statically load the library which contains all native functions used in here */
static {
try {
+ /* prefer the version on disk, if existing */
System.loadLibrary("SG_java");
- } catch(UnsatisfiedLinkError e) {
+ } catch (UnsatisfiedLinkError e) {
+ /* If not found, unpack the one bundled into the jar file and use it */
+ loadLib("simgrid");
+ loadLib("SG_java");
+ }
+ }
+ private static void loadLib (String name) {
+ String Path = "NATIVE/"+System.getProperty("os.name")+"/"+System.getProperty("os.arch")+"/";
+ String filename=name;
+ InputStream in = Msg.class.getClassLoader().getResourceAsStream(Path+filename);
+
+ if (in == null) {
+ filename = "lib"+name+".so";
+ in = Msg.class.getClassLoader().getResourceAsStream(Path+filename);
+ }
+ if (in == null) {
+ filename = name+".dll";
+ in = Msg.class.getClassLoader().getResourceAsStream(Path+filename);
+ }
+ if (in == null) {
+ filename = "lib"+name+".dylib";
+ in = Msg.class.getClassLoader().getResourceAsStream(Path+filename);
+ }
+ if (in == null) {
+ throw new RuntimeException("Cannot find library "+name+" in path "+Path+". Sorry, but this jar does not seem to be usable on your machine.");
+ }
+// Caching the file on disk: desactivated because it could fool the users
+// if (new File(filename).isFile()) {
+// // file was already unpacked -- use it directly
+// System.load(new File(".").getAbsolutePath()+File.separator+filename);
+// return;
+// }
+ try {
+ // We must write the lib onto the disk before loading it -- stupid operating systems
+ File fileOut = new File(filename);
+// if (!new File(".").canWrite()) {
+// System.out.println("Cannot write in ."+File.separator+filename+"; unpacking the library into a temporary file instead");
+ fileOut = File.createTempFile("simgrid-", ".tmp");
+ // don't leak the file on disk, but remove it on JVM shutdown
+ Runtime.getRuntime().addShutdownHook(new Thread(new FileCleaner(fileOut.getAbsolutePath())));
+// }
+// System.out.println("Unpacking SimGrid native library to " + fileOut.getAbsolutePath());
+ OutputStream out = new FileOutputStream(fileOut);
+
+ /* copy the library in position */
+ byte[] buffer = new byte[4096];
+ int bytes_read;
+ while ((bytes_read = in.read(buffer)) != -1) // Read until EOF
+ out.write(buffer, 0, bytes_read);
+
+ /* close all file descriptors, and load that shit */
+ in.close();
+ out.close();
+ System.load(fileOut.getAbsolutePath());
+ } catch (Exception e) {
System.err.println("Cannot load the bindings to the simgrid library: ");
e.printStackTrace();
- System.err.println(
- "Please check your LD_LIBRARY_PATH, or copy the simgrid and SG_java libraries to the current directory");
+ System.err.println("This jar file does not seem to fit your system, sorry");
System.exit(1);
}
+ }
+ /* A hackish mechanism used to remove the file containing our library when the JVM shuts down */
+ private static class FileCleaner implements Runnable {
+ private String target;
+ public FileCleaner(String name) {
+ target = name;
+ }
+ public void run() {
+ try {
+ new File(target).delete();
+ } catch(Exception e) {
+ System.out.println("Unable to clean temporary file "+target+" during shutdown.");
+ e.printStackTrace();
+ }
+ }
}
+
/** Retrieve the simulation time
* @return
*/