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/*
* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @test
* @modules jdk.zipfs
* @library /lib/testlibrary
* @build ModulesInCustomFileSystem JarUtils m1/* m2/*
* @run testng/othervm ModulesInCustomFileSystem
* @summary Test ModuleFinder to find modules in a custom file system
*/
import java.io.File;
import java.lang.module.Configuration;
import java.lang.module.ModuleFinder;
import java.lang.module.ModuleReader;
import java.lang.module.ModuleReference;
import java.lang.reflect.Method;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Set;
import org.testng.annotations.Test;
import static org.testng.Assert.*;
@Test
public class ModulesInCustomFileSystem {
private static final Path HERE = Paths.get("");
/**
* Test exploded modules in a JAR file system.
*/
public void testExplodedModulesInJarFileSystem() throws Exception {
Path m1 = findModuleDirectory("m1");
Path m2 = findModuleDirectory("m2");
Path mlib = m1.getParent();
assertEquals(mlib, m2.getParent());
// create JAR file containing m1/** and m2/**
Path jar = Files.createTempDirectory(HERE, "mlib").resolve("modules.jar");
JarUtils.createJarFile(jar, mlib);
testJarFileSystem(jar);
}
/**
* Test modular JARs in a JAR file system
*/
public void testModularJARsInJarFileSystem() throws Exception {
Path m1 = findModuleDirectory("m1");
Path m2 = findModuleDirectory("m2");
Path contents = Files.createTempDirectory(HERE, "contents");
JarUtils.createJarFile(contents.resolve("m1.jar"), m1);
JarUtils.createJarFile(contents.resolve("m2.jar"), m2);
// create JAR file containing m1.jar and m2.jar
Path jar = Files.createTempDirectory(HERE, "mlib").resolve("modules.jar");
JarUtils.createJarFile(jar, contents);
testJarFileSystem(jar);
}
/**
* Opens a JAR file as a file system
*/
private void testJarFileSystem(Path jar) throws Exception {
ClassLoader scl = ClassLoader.getSystemClassLoader();
try (FileSystem fs = FileSystems.newFileSystem(jar, scl)) {
// ModuleFinder to find modules in top-level directory
Path top = fs.getPath("/");
ModuleFinder finder = ModuleFinder.of(top);
// list the modules
listAllModules(finder);
// load modules into child layer, invoking m1/p.Main
loadAndRunModule(finder);
}
}
/**
* List all modules that the finder finds and the resources in the module.
*/
private void listAllModules(ModuleFinder finder) throws Exception {
for (ModuleReference mref : finder.findAll()) {
System.out.println(mref.descriptor());
try (ModuleReader reader = mref.open()) {
reader.list().forEach(name -> System.out.format(" %s%n", name));
}
}
}
/**
* Creates a child layer with m1 and m2, invokes m1/p.Main to ensure that
* classes can be loaded.
*/
private void loadAndRunModule(ModuleFinder finder) throws Exception {
ModuleLayer bootLayer = ModuleLayer.boot();
Configuration cf = bootLayer.configuration()
.resolve(finder, ModuleFinder.of(), Set.of("m1"));
ClassLoader scl = ClassLoader.getSystemClassLoader();
ModuleLayer layer = bootLayer.defineModulesWithOneLoader(cf, scl);
Class<?> c = layer.findLoader("m1").loadClass("p.Main");
Method m = c.getMethod("main", String[].class);
m.invoke(null, (Object)new String[0]);
}
/**
* Find the directory for a module on the module path
*/
private Path findModuleDirectory(String name) {
String mp = System.getProperty("jdk.module.path");
for (String element : mp.split(File.pathSeparator)) {
Path dir = Paths.get(element).resolve(name);
if (Files.exists(dir)) {
return dir;
}
}
assertFalse(true);
return null;
}
}
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