1 /* JNI interface to C code for MSG. */
3 /* Copyright (c) 2006-2014. The SimGrid Team.
4 * All rights reserved. */
6 /* This program is free software; you can redistribute it and/or modify it
7 * under the terms of the license (GNU LGPL) which comes with this package. */
9 package org.simgrid.msg;
11 import java.io.FileOutputStream;
12 import java.io.InputStream;
13 import java.io.OutputStream;
17 public final class Msg {
18 /* Statically load the library which contains all native functions used in here */
19 static private boolean isNativeInited = false;
20 public static void nativeInit() {
24 /* prefer the version on disk, if existing */
25 System.loadLibrary("simgrid-java");
26 } catch (UnsatisfiedLinkError e) {
27 /* If not found, unpack the one bundled into the jar file and use it */
29 loadLib("simgrid-java");
31 isNativeInited = true;
36 private static void loadLib (String name) {
37 String Path = NativeLib.getPath();
40 InputStream in = Msg.class.getClassLoader().getResourceAsStream(Path+filename);
43 filename = "lib"+name+".so";
44 in = Msg.class.getClassLoader().getResourceAsStream(Path+filename);
47 filename = name+".dll";
48 in = Msg.class.getClassLoader().getResourceAsStream(Path+filename);
51 filename = "lib"+name+".dll";
52 in = Msg.class.getClassLoader().getResourceAsStream(Path+filename);
55 filename = "lib"+name+".dylib";
56 in = Msg.class.getClassLoader().getResourceAsStream(Path+filename);
59 throw new RuntimeException("Cannot find library "+name+" in path "+Path+". Sorry, but this jar does not seem to be usable on your machine.");
61 // Caching the file on disk: desactivated because it could fool the users
62 // if (new File(filename).isFile()) {
63 // // file was already unpacked -- use it directly
64 // System.load(new File(".").getAbsolutePath()+File.separator+filename);
68 // We must write the lib onto the disk before loading it -- stupid operating systems
69 File fileOut = new File(filename);
70 // if (!new File(".").canWrite()) {
71 // System.out.println("Cannot write in ."+File.separator+filename+"; unpacking the library into a temporary file instead");
72 fileOut = File.createTempFile("simgrid-", ".tmp");
73 // don't leak the file on disk, but remove it on JVM shutdown
74 Runtime.getRuntime().addShutdownHook(new Thread(new FileCleaner(fileOut.getAbsolutePath())));
76 // System.out.println("Unpacking SimGrid native library to " + fileOut.getAbsolutePath());
77 OutputStream out = new FileOutputStream(fileOut);
79 /* copy the library in position */
80 byte[] buffer = new byte[4096];
82 while ((bytes_read = in.read(buffer)) != -1) // Read until EOF
83 out.write(buffer, 0, bytes_read);
85 /* close all file descriptors, and load that shit */
88 System.load(fileOut.getAbsolutePath());
89 } catch (Exception e) {
90 System.err.println("Cannot load the bindings to the simgrid library: ");
92 System.err.println("This jar file does not seem to fit your system, sorry");
96 /* A hackish mechanism used to remove the file containing our library when the JVM shuts down */
97 private static class FileCleaner implements Runnable {
98 private String target;
99 public FileCleaner(String name) {
104 new File(target).delete();
105 } catch(Exception e) {
106 System.out.println("Unable to clean temporary file "+target+" during shutdown.");
112 /** Retrieve the simulation time
113 * @return The simulation time.
115 public final static native double getClock();
117 * Issue a debug logging message.
118 * @param s message to log.
120 public final static native void debug(String s);
122 * Issue an verbose logging message.
123 * @param s message to log.
125 public final static native void verb(String s);
127 /** Issue an information logging message
130 public final static native void info(String s);
132 * Issue an warning logging message.
133 * @param s message to log.
135 public final static native void warn(String s);
137 * Issue an error logging message.
138 * @param s message to log.
140 public final static native void error(String s);
142 * Issue an critical logging message.
143 * @param s message to log.
145 public final static native void critical(String s);
147 /*********************************************************************************
148 * Deployment and initialization related functions *
149 *********************************************************************************/
152 * The natively implemented method to initialize a MSG simulation.
154 * @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.
166 public final static native void run() ;
168 /** This function is useless nowadays, just stop calling it. */
170 public final static void clean(){}
173 * The native implemented method to create the environment of the simulation.
175 * @param platformFile The XML file which contains the description of the environment of the simulation
178 public final static native void createEnvironment(String platformFile);
180 public final static native As environmentGetRoutingRoot();
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 */