src/bindings/java/org/simgrid/NativeLib.java

   1 /* Copyright (c) 2014. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   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. */
   6
   7 package org.simgrid;
   8
   9 import java.io.FileOutputStream;
  10 import java.io.InputStream;
  11 import java.io.OutputStream;
  12 import java.io.File;
  13
  14 public final class NativeLib {
  15
  16         public static String getPath() {
  17                 String prefix = "NATIVE";
  18                 String os = System.getProperty("os.name");
  19                 String arch = System.getProperty("os.arch");
  20
  21                 if (arch.matches("^i[3-6]86$"))
  22                         arch = "x86";
  23                 else if (arch.equalsIgnoreCase("x86_64"))
  24                         arch = "amd64";
  25
  26                 if (os.toLowerCase().startsWith("win")){
  27                         os = "Windows";
  28                 } else if (os.contains("OS X"))
  29                         os = "Darwin";
  30
  31                 os = os.replace(' ', '_');
  32                 arch = arch.replace(' ', '_');
  33
  34                 return prefix + "/" + os + "/" + arch + "/";
  35         }
  36         public static void nativeInit(String name) {
  37                 try {
  38                         /* Prefer the version of the library bundled into the jar file and use it */
  39                         loadLib(name);
  40                 } catch (SimGridLibNotFoundException e) {
  41                         /* If not found, try to see if we can find a version on disk */
  42                         try {
  43                                 System.loadLibrary(name);
  44                         } catch (UnsatisfiedLinkError e2) {
  45                                 System.err.println("Cannot load the bindings to the "+name+" library in path "+getPath());
  46                                 e.printStackTrace();
  47                                 System.err.println("This jar file does not seem to fit your system, and I cannot find an installation of SimGrid.");
  48                                 System.exit(1);
  49                         }
  50                 }
  51         }
  52
  53         private static void loadLib (String name) throws SimGridLibNotFoundException {
  54                 String Path = NativeLib.getPath();
  55
  56                 String filename=name;
  57                 InputStream in = NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
  58
  59                 if (in == null) {
  60                         filename = "lib"+name+".so";
  61                         in = NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
  62                 }
  63                 if (in == null) {
  64                         filename = name+".dll";
  65                         in =  NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
  66                 }
  67                 if (in == null) {
  68                         filename = "lib"+name+".dll";
  69                         in =  NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
  70                 }
  71                 if (in == null) {
  72                         filename = "lib"+name+".dylib";
  73                         in =  NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
  74                 }
  75                 if (in == null) {
  76                         throw new SimGridLibNotFoundException("Cannot find library "+name+" in path "+Path+". Sorry, but this jar does not seem to be usable on your machine.");
  77                 }
  78                 try {
  79                         // We must write the lib onto the disk before loading it -- stupid operating systems
  80                         File fileOut = new File(filename);
  81                         fileOut = File.createTempFile(name+"-", ".tmp");
  82                         // don't leak the file on disk, but remove it on JVM shutdown
  83                         Runtime.getRuntime().addShutdownHook(new Thread(new FileCleaner(fileOut.getAbsolutePath())));
  84                         OutputStream out = new FileOutputStream(fileOut);
  85
  86                         /* copy the library in position */
  87                         byte[] buffer = new byte[4096];
  88                         int bytes_read;
  89                         while ((bytes_read = in.read(buffer)) != -1)     // Read until EOF
  90                                 out.write(buffer, 0, bytes_read);
  91
  92                         /* close all file descriptors, and load that shit */
  93                         in.close();
  94                         out.close();
  95                         System.load(fileOut.getAbsolutePath());
  96                 } catch (Exception e) {
  97                         System.err.println("Error while extracting the native library from the jar: ");
  98                         e.printStackTrace();
  99                         throw new SimGridLibNotFoundException("Cannot load the bindings to the "+name+" library in path "+getPath(),   e);
 100                 }
 101         }
 102
 103         /* A hackish mechanism used to remove the file containing our library when the JVM shuts down */
 104         private static class FileCleaner implements Runnable {
 105                 private String target;
 106                 public FileCleaner(String name) {
 107                         target = name;
 108                 }
 109                 public void run() {
 110                         try {
 111                                 new File(target).delete();
 112                         } catch(Exception e) {
 113                                 System.out.println("Unable to clean temporary file "+target+" during shutdown.");
 114                                 e.printStackTrace();
 115                         }
 116                 }
 117         }
 118
 119
 120         public static void main(String[] args) {
 121                 System.out.println("This jarfile searches the native code under: " +getPath());
 122         }
 123 }
 124
 125 class SimGridLibNotFoundException extends Exception {
 126         private static final long serialVersionUID = 1L;
 127         public SimGridLibNotFoundException(String msg) {
 128                 super(msg);
 129         }
 130
 131         public SimGridLibNotFoundException(String msg, Exception e) {
 132                 super(msg,e);
 133         }
 134 }