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.IOException;
  12 import java.io.OutputStream;
  13 import java.io.File;
  14 import java.nio.file.Files;
  15 import java.nio.file.Path;
  16
  17 public final class NativeLib {
  18         /* Statically load the library which contains all native functions used in here */
  19         private static boolean isNativeInited = false;
  20         static Path tempDir = null;
  21
  22         private NativeLib() {
  23                 throw new IllegalAccessError("Utility class");
  24         }
  25
  26         public static void nativeInit() {
  27                 if (isNativeInited)
  28                         return;
  29
  30                 if (System.getProperty("os.name").toLowerCase().startsWith("win"))
  31                         NativeLib.nativeInit("winpthread-1");
  32
  33                 NativeLib.nativeInit("simgrid");
  34                 NativeLib.nativeInit("simgrid-java");
  35                 isNativeInited = true;
  36         }
  37
  38         public static void nativeInit(String name) {
  39                 try {
  40                         /* Prefer the version of the library bundled into the jar file and use it */
  41                         loadLib(name);
  42                 } catch (LinkageException embeededException) {
  43                         /* If not found, try to see if we can find a version on disk */
  44                         try {
  45                                 System.loadLibrary(name);
  46                         } catch (UnsatisfiedLinkError systemException) {
  47                                 if (! "boost_context".equals(name)) { // Ignore when we cannot load boost_context
  48
  49                                         System.err.println("\nCannot load the bindings to the "+name+" library in path "+getPath());
  50                                         Throwable cause = embeededException.getCause();
  51                                         if (cause instanceof java.lang.UnsatisfiedLinkError) {
  52                                                 if (cause.getMessage().matches(".*libcgraph.so.*"))
  53                                                         System.err.println("HINT: Try to install the libcgraph package (sudo apt-get install libcgraph).");
  54                                                 else if (cause.getMessage().matches(".*libboost_context.so.*"))
  55                                                         System.err.println("HINT: Try to install the boost-context package (sudo apt-get install libboost-context-dev).");
  56                                                 else
  57                                                         System.err.println("Try to install the missing dependencies, which name should appear above.");
  58                                         } else {
  59                                                 System.err.println("This jar file does not seem to fit your system, and no usable SimGrid installation found on disk.");
  60                                         }
  61                                         System.err.println();
  62                                         cause.printStackTrace();
  63                                         System.exit(1);
  64                                 }
  65                         }
  66                 }
  67         }
  68
  69         public static String getPath() {
  70                 // Inspiration: https://github.com/xerial/snappy-java/blob/develop/src/main/java/org/xerial/snappy/OSInfo.java
  71                 String prefix = "NATIVE";
  72                 String os = System.getProperty("os.name");
  73                 String arch = System.getProperty("os.arch");
  74
  75                 if (arch.matches("^i[3-6]86$"))
  76                         arch = "x86";
  77                 else if ("x86_64".equalsIgnoreCase(arch) || "AMD64".equalsIgnoreCase(arch))
  78                         arch = "amd64";
  79
  80                 if (os.toLowerCase().startsWith("win")){
  81                         os = "Windows";
  82                 } else if (os.contains("OS X"))
  83                         os = "Darwin";
  84
  85                 os = os.replace(' ', '_');
  86                 arch = arch.replace(' ', '_');
  87
  88                 return prefix + "/" + os + "/" + arch + "/";
  89         }
  90
  91         private static void loadLib (String name) throws LinkageException {
  92                 String path = NativeLib.getPath();
  93
  94                 String filename=name;
  95                 InputStream in = NativeLib.class.getClassLoader().getResourceAsStream(path+filename);
  96
  97                 if (in == null) {
  98                         filename = "lib"+name+".so";
  99                         in = NativeLib.class.getClassLoader().getResourceAsStream(path+filename);
 100                 }
 101                 if (in == null) {
 102                         filename = name+".dll";
 103                         in =  NativeLib.class.getClassLoader().getResourceAsStream(path+filename);
 104                 }
 105                 if (in == null) {
 106                         filename = "lib"+name+".dll";
 107                         in =  NativeLib.class.getClassLoader().getResourceAsStream(path+filename);
 108                 }
 109                 if (in == null) {
 110                         filename = "lib"+name+".dylib";
 111                         in =  NativeLib.class.getClassLoader().getResourceAsStream(path+filename);
 112                 }
 113                 if (in == null) {
 114                         throw new LinkageException("Cannot find library "+name+" in path "+path+". Sorry, but this jar does not seem to be usable on your machine.");
 115                 }
 116                 try {
 117                         // We must write the lib onto the disk before loading it -- stupid operating systems
 118                         if (tempDir == null) {
 119                                 tempDir = Files.createTempDirectory("simgrid-java-");
 120                                 // don't leak the files on disk, but remove it on JVM shutdown
 121                                 Runtime.getRuntime().addShutdownHook(new Thread(new FileCleaner(tempDir.toFile())));
 122                         }
 123                         File fileOut = new File(tempDir.toFile().getAbsolutePath() + File.separator + filename);
 124
 125                         /* copy the library in position */
 126                         OutputStream out = new FileOutputStream(fileOut);
 127                         byte[] buffer = new byte[4096];
 128                         int bytesRead;
 129                         while ((bytesRead = in.read(buffer)) != -1)     // Read until EOF
 130                                 out.write(buffer, 0, bytesRead);
 131
 132                         /* close all file descriptors, and load that shit */
 133                         in.close();
 134                         out.close();
 135                         System.load(fileOut.getAbsolutePath());
 136                 } catch (SecurityException|UnsatisfiedLinkError|IOException e) {
 137                         throw new LinkageException("Cannot load the bindings to the "+name+" library in path "+getPath(), e);
 138                 }
 139         }
 140
 141         /* A hackish mechanism used to remove the file containing our library when the JVM shuts down */
 142         private static class FileCleaner implements Runnable {
 143                 private File dir;
 144                 public FileCleaner(File dir) {
 145                         this.dir = dir;
 146                 }
 147                 @Override
 148                 public void run() {
 149                         try {
 150                                 for (File f : dir.listFiles())
 151                                         if (! f.delete() )
 152                                                 System.err.println("Unable to clean temporary file "+f.getAbsolutePath()+" during shutdown.");
 153                                 if (! dir.delete() )
 154                                         System.err.println("Unable to clean temporary file "+dir.getAbsolutePath()+" during shutdown.");
 155                         } catch(Exception e) {
 156                                 System.err.println("Unable to clean temporary file "+dir.getAbsolutePath()+" during shutdown: "+e.getCause());
 157                                 e.printStackTrace();
 158                         }
 159                 }
 160         }
 161
 162
 163         public static void main(String[] args) {
 164                 System.out.println("This jarfile searches the native code under: " +getPath());
 165         }
 166 }
 167
 168 class LinkageException extends Exception {
 169         private static final long serialVersionUID = 1L;
 170         public LinkageException(String msg) {
 171                 super(msg);
 172         }
 173
 174         public LinkageException(String msg, Throwable e) {
 175                 super(msg,e);
 176         }
 177 }