2 * JNI interface to C code for MSG.
4 * Copyright 2006-2012 The SimGrid Team.
7 * This program is free software; you can redistribute
8 * it and/or modify it under the terms of the license
9 * (GNU LGPL) which comes with this package.
12 package org.simgrid.msg;
14 import java.io.FileOutputStream;
15 import java.io.InputStream;
16 import java.io.OutputStream;
20 public final class Msg {
21 /* Statically load the library which contains all native functions used in here */
22 static private boolean isNativeInited = false;
23 public static void nativeInit() {
27 /* prefer the version on disk, if existing */
28 System.loadLibrary("SG_java");
29 } catch (UnsatisfiedLinkError e) {
30 /* If not found, unpack the one bundled into the jar file and use it */
34 isNativeInited = true;
39 private static void loadLib (String name) {
40 String Path = "NATIVE/"+System.getProperty("os.name")+"/"+System.getProperty("os.arch")+"/";
42 InputStream in = Msg.class.getClassLoader().getResourceAsStream(Path+filename);
45 filename = "lib"+name+".so";
46 in = Msg.class.getClassLoader().getResourceAsStream(Path+filename);
49 filename = name+".dll";
50 in = Msg.class.getClassLoader().getResourceAsStream(Path+filename);
53 filename = "lib"+name+".dylib";
54 in = Msg.class.getClassLoader().getResourceAsStream(Path+filename);
57 throw new RuntimeException("Cannot find library "+name+" in path "+Path+". Sorry, but this jar does not seem to be usable on your machine.");
59 // Caching the file on disk: desactivated because it could fool the users
60 // if (new File(filename).isFile()) {
61 // // file was already unpacked -- use it directly
62 // System.load(new File(".").getAbsolutePath()+File.separator+filename);
66 // We must write the lib onto the disk before loading it -- stupid operating systems
67 File fileOut = new File(filename);
68 // if (!new File(".").canWrite()) {
69 // System.out.println("Cannot write in ."+File.separator+filename+"; unpacking the library into a temporary file instead");
70 fileOut = File.createTempFile("simgrid-", ".tmp");
71 // don't leak the file on disk, but remove it on JVM shutdown
72 Runtime.getRuntime().addShutdownHook(new Thread(new FileCleaner(fileOut.getAbsolutePath())));
74 // System.out.println("Unpacking SimGrid native library to " + fileOut.getAbsolutePath());
75 OutputStream out = new FileOutputStream(fileOut);
77 /* copy the library in position */
78 byte[] buffer = new byte[4096];
80 while ((bytes_read = in.read(buffer)) != -1) // Read until EOF
81 out.write(buffer, 0, bytes_read);
83 /* close all file descriptors, and load that shit */
86 System.load(fileOut.getAbsolutePath());
87 } catch (Exception e) {
88 System.err.println("Cannot load the bindings to the simgrid library: ");
90 System.err.println("This jar file does not seem to fit your system, sorry");
94 /* A hackish mechanism used to remove the file containing our library when the JVM shuts down */
95 private static class FileCleaner implements Runnable {
96 private String target;
97 public FileCleaner(String name) {
102 new File(target).delete();
103 } catch(Exception e) {
104 System.out.println("Unable to clean temporary file "+target+" during shutdown.");
110 /** Retrieve the simulation time
113 public final static native double getClock();
115 * Issue a debug logging message.
116 * @param s message to log.
118 public final static native void debug(String s);
120 * Issue an verbose logging message.
121 * @param s message to log.
123 public final static native void verb(String s);
125 /** Issue an information logging message
128 public final static native void info(String s);
130 * Issue an warning logging message.
131 * @param s message to log.
133 public final static native void warn(String s);
135 * Issue an error logging message.
136 * @param s message to log.
138 public final static native void error(String s);
140 * Issue an critical logging message.
141 * @param s message to log.
143 public final static native void critical(String s);
145 /*********************************************************************************
146 * Deployment and initialization related functions *
147 *********************************************************************************/
150 * The natively implemented method to initialize a MSG simulation.
152 * @param args The arguments of the command line of the simulation.
156 public final static native void init(String[]args);
159 * Run the MSG simulation.
161 * The simulation is not cleaned afterward (see
162 * {@link #clean()} if you really insist on cleaning the C side), so you can freely
163 * retrieve the informations that you want from the simulation. In particular, retrieving the status
164 * of a process or the current date is perfectly ok.
168 public final static native void run() ;
170 /** This function is useless nowadays, just stop calling it. */
172 public final static void clean(){}
175 * The native implemented method to create the environment of the simulation.
177 * @param platformFile The XML file which contains the description of the environment of the simulation
180 public final static native void createEnvironment(String platformFile);
183 * The method to deploy the simulation.
186 * @param deploymentFile
188 public final static native void deployApplication(String deploymentFile);
190 /** Example launcher. You can use it or provide your own launcher, as you wish
192 * @throws MsgException
194 static public void main(String[]args) throws MsgException {
195 /* initialize the MSG simulation. Must be done before anything else (even logging). */
198 if (args.length < 2) {
199 Msg.info("Usage: Msg platform_file deployment_file");
203 /* Load the platform and deploy the application */
204 Msg.createEnvironment(args[0]);
205 Msg.deployApplication(args[1]);
206 /* Execute the simulation */