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aQute.launcher.pre.EmbeddedLauncher Maven / Gradle / Ivy
package aQute.launcher.pre;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.reflect.InvocationTargetException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
import java.util.zip.ZipEntry;
public class EmbeddedLauncher {
private static final File CWD = new File(System.getProperty("user.dir"));
private static final String LAUNCH_TRACE = "launch.trace";
private static final int BUFFER_SIZE = 4096 * 16;
public static final String EMBEDDED_RUNPATH = "Embedded-Runpath";
public static final String LAUNCHER_PATH = "launcher.runpath";
public static Manifest MANIFEST;
static int restarts = 0;
public static void main(String... args) throws Throwable {
boolean isVerbose = isTrace();
if (args.length > 0 && args[0].equals("-extract")) {
if (isVerbose)
log("running in extraction mode");
extract(args);
return;
}
do {
try {
System.setProperty("launch.framework.restart.count", Integer.toString(restarts));
findAndExecute(isVerbose, "main", void.class, args);
return;
} catch (Throwable e) {
if (e.getClass()
.getSimpleName()
.equals("FrameworkRestart")) {
restarts++;
continue;
}
throw e;
}
} while (true);
}
/**
* Runs the Launcher like the main method, but returns an usable exit Code.
* This Method was introduced to enable compatibility with the Equinox
* native executables.
*
* @param args the arguments to run the Launcher with
* @return an exit code
* @throws Throwable
*/
public int run(String... args) throws Throwable {
boolean isVerbose = isTrace();
if (isVerbose) {
log("The following arguments are given:");
for (String arg : args) {
log(arg);
}
}
String methodName = "run";
Class returnType = int.class;
return findAndExecute(isVerbose, methodName, returnType, args);
}
/**
* @param isVerbose should we log debug messages
* @param methodName the method name to look for
* @param returnType the expected return type
* @param args the arguments for the method
* @return what ever the method returns
* @throws Throwable
*/
private static T findAndExecute(boolean isVerbose, String methodName, Class returnType, String... args)
throws Throwable {
ClassLoader cl = EmbeddedLauncher.class.getClassLoader();
if (isVerbose)
log("looking for " + EMBEDDED_RUNPATH + " in META-INF/MANIFEST.MF");
Enumeration manifests = cl.getResources("META-INF/MANIFEST.MF");
while (manifests.hasMoreElements()) {
URL murl = manifests.nextElement();
if (isVerbose)
log("found manifest %s", murl);
Manifest m = new Manifest(murl.openStream());
String runpath = m.getMainAttributes()
.getValue(EMBEDDED_RUNPATH);
if (runpath != null) {
if (isVerbose)
log("Going through the following " + EMBEDDED_RUNPATH + " %s", runpath);
MANIFEST = m;
return executeWithRunPath(isVerbose, methodName, returnType, cl, runpath, false, args);
}
}
if (isVerbose)
log("looking for -D" + LAUNCHER_PATH);
String runpath = System.getProperty(LAUNCHER_PATH);
if (runpath != null) {
if (isVerbose)
log("found -D" + LAUNCHER_PATH + "=%s", runpath);
int l = runpath.length() - 1;
if (l > 1) {
char q = runpath.charAt(0);
if (((q == '\'') || (q == '"')) && (q == runpath.charAt(l))) {
runpath = runpath.substring(1, l);
}
}
return executeWithRunPath(isVerbose, methodName, returnType, cl, runpath, true, args);
}
throw new RuntimeException(
"Found Nothing to launch. Maybe no " + EMBEDDED_RUNPATH + " or -D" + LAUNCHER_PATH + " was set");
}
private static T executeWithRunPath(boolean isVerbose, String methodName, Class returnType, ClassLoader cl,
String runpath, boolean pathExternal, String... args) throws Throwable {
List classpath = new ArrayList<>();
for (String path : runpath.split("\\s*,\\s*")) {
URL url = !pathExternal ? toFileURL(cl.getResource(path))
: Paths.get(path)
.toUri()
.toURL();
if (isVerbose)
log("Adding to classpath %s", url.toString());
classpath.add(url);
}
if (isVerbose)
log("creating classloader using %s", Loader.class.getName());
try (Loader urlc = new Loader(classpath.toArray(new URL[0]), cl)) {
if (isVerbose)
log("Try to load aQute.launcher.Launcher");
Class aQutelauncherLauncher = urlc.loadClass("aQute.launcher.Launcher");
if (isVerbose)
log("looking for method %s with return type %s", methodName, returnType.toString());
MethodHandle mh = MethodHandles.publicLookup()
.findStatic(aQutelauncherLauncher, methodName, MethodType.methodType(returnType, String[].class));
try {
if (isVerbose)
log("found method and start executing");
return (T) mh.invoke(args);
} catch (Error | Exception e) {
throw e;
} catch (Throwable e) {
throw new InvocationTargetException(e);
}
}
}
private static void log(String message, Object... args) {
System.out.println("[" + EmbeddedLauncher.class.getSimpleName() + "] " + String.format(message, args));
}
private static boolean isTrace() {
return Boolean.getBoolean(LAUNCH_TRACE);
}
private static void extract(String... args) throws URISyntaxException, IOException {
String to = "";
if (args.length == 2) {
to = args[1];
}
File source = new File(EmbeddedLauncher.class.getProtectionDomain()
.getCodeSource()
.getLocation()
.toURI());
if (!source.isFile()) {
System.err.println("Cannot locate JAR file " + source);
System.exit(-1);
}
File dir = to == null ? CWD : new File(to);
dir.mkdirs();
if (!dir.isDirectory()) {
System.err.println("No such output directory : " + dir);
System.exit(-1);
}
System.err.println("Extracting to " + dir);
URI toFile = dir.toURI();
try (JarFile jar = new JarFile(source)) {
jar.stream()
.forEach(entry -> {
String path = entry.getName();
// Make sure we do not copy outside our 'to' path
while (path.startsWith("/") || path.startsWith("."))
path = path.substring(1);
String method;
switch (entry.getMethod()) {
case ZipEntry.DEFLATED :
method = "<";
break;
case ZipEntry.STORED :
method = "=";
break;
default :
method = "?";
break;
}
long size = entry.getSize();
URI resolve = toFile.resolve(path);
Path target = new File(resolve).toPath();
System.out.printf("%s %5d %s%n", method, size, target);
if (entry.isDirectory()) {
try {
if (!Files.isDirectory(target))
Files.createDirectory(target);
} catch (IOException e) {
e.printStackTrace();
System.exit(-1);
}
} else {
try (InputStream inputStream = jar.getInputStream(entry)) {
Files.copy(inputStream, target, StandardCopyOption.REPLACE_EXISTING);
} catch (IOException e) {
e.printStackTrace();
System.exit(-1);
}
}
});
}
}
private static URL toFileURL(URL resource) throws IOException {
//
// Don't bother copying file urls
//
if (resource.getProtocol()
.equalsIgnoreCase("file"))
return resource;
//
// Need to make a copy to a temp file
//
File f = File.createTempFile("resource", ".jar");
Files.createDirectories(f.getParentFile()
.toPath());
try (InputStream in = resource.openStream(); OutputStream out = Files.newOutputStream(f.toPath())) {
byte[] buffer = new byte[BUFFER_SIZE];
for (int size; (size = in.read(buffer, 0, buffer.length)) > 0;) {
out.write(buffer, 0, size);
}
}
f.deleteOnExit();
return f.toURI()
.toURL();
}
public static class Loader extends URLClassLoader {
public Loader(URL[] urls, ClassLoader parent) {
super(urls, parent);
}
@Override
public void addURL(URL url) {
super.addURL(url);
}
}
}
