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co.paralleluniverse.capsule.CapsuleLauncher Maven / Gradle / Ivy
/*
* Capsule
* Copyright (c) 2014, Parallel Universe Software Co. All rights reserved.
*
* This program and the accompanying materials are licensed under the terms
* of the Eclipse Public License v1.0, available at
* http://www.eclipse.org/legal/epl-v10.html
*/
package co.paralleluniverse.capsule;
import co.paralleluniverse.common.JarClassLoader;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.jar.JarInputStream;
import java.util.jar.Manifest;
/**
* Provides methods for loading, inspecting, and launching capsules.
*
* @author pron
*/
public final class CapsuleLauncher {
private static final String CAPSULE_CLASS_NAME = "Capsule";
private static final String OPT_JMX_REMOTE = "com.sun.management.jmxremote";
private static final String ATTR_MAIN_CLASS = "Main-Class";
private static final String PROP_USER_HOME = "user.home";
private static final String PROP_OS_NAME = "os.name";
private static final String CACHE_DEFAULT_NAME = "capsule";
/**
* Creates a new capsule
*
* @param jarFile the capsule JAR
* @param cacheDir the directory to use as cache
* @return a capsule object which can then be passed to {@link #getAppId(Object) getAppId} and
* {@link #prepareForLaunch(Object, List, List) prepareForLaunch}.
*/
public static Object newCapsule(Path jarFile, Path cacheDir) {
return newCapsule(jarFile, cacheDir, null);
}
public static Object newCapsule(Path jarFile, Path cacheDir, Map javaHomes) {
try {
final Manifest mf;
try (final JarInputStream jis = new JarInputStream(Files.newInputStream(jarFile))) {
mf = jis.getManifest();
}
final ClassLoader cl = new JarClassLoader(jarFile, true);
final Class clazz = loadCapsuleClass(mf, cl);
if (clazz == null)
throw new RuntimeException(jarFile + " does not appear to be a valid capsule.");
if (javaHomes != null)
setJavaHomes(clazz, javaHomes);
final Constructor ctor = clazz.getDeclaredConstructor(Path.class, Path.class);
ctor.setAccessible(true);
return ctor.newInstance(jarFile, cacheDir);
} catch (IOException e) {
throw new RuntimeException(e);
} catch (ReflectiveOperationException e) {
throw new RuntimeException("Could not create capsule instance.", e);
}
}
private static Class loadCapsuleClass(Manifest mf, ClassLoader cl) {
final String mainClass = mf.getMainAttributes() != null ? mf.getMainAttributes().getValue(ATTR_MAIN_CLASS) : null;
if (mainClass == null)
return null;
try {
Class clazz = cl.loadClass(mainClass);
if (!isCapsuleClass(clazz))
clazz = null;
return clazz;
} catch (ClassNotFoundException e) {
return null;
}
}
private static boolean isCapsuleClass(Class clazz) {
if (clazz == null)
return false;
if (CAPSULE_CLASS_NAME.equals(clazz.getName()))
return true;
return isCapsuleClass(clazz.getSuperclass());
}
/**
* Creates a {@link ProcessBuilder} ready to use for launching the capsule.
*
* @param capsule the capsule object returned from {@link #newCapsule(Path, Path) newCapsule}.
* @param jvmArgs JVM arguments to use for launching the capsule
* @param args command line arguments to pass to the capsule.
* @return a {@link ProcessBuilder} for launching the capsule process
*/
public static ProcessBuilder prepareForLaunch(Object capsule, List jvmArgs, List args) {
final Method launch = getCapsuleMethod(capsule, "prepareForLaunch", List.class, String[].class);
return (ProcessBuilder) invoke(capsule, launch, jvmArgs, (String[]) args.toArray(new String[args.size()]));
}
/**
* Returns a capsule's ID.
*
* @param capsule the capsule object returned from {@link #newCapsule(Path, Path) newCapsule}.
* @return the capsule's ID.
*/
public static String getAppId(Object capsule) {
final Method appId = getCapsuleMethod(capsule, "appId", String[].class);
return (String) invoke(capsule, appId, (Object) null);
}
/**
* Returns a capsule's version.
*
* @param capsule the capsule object returned from {@link #newCapsule(Path, Path) newCapsule}.
* @return the capsule's version.
*/
public static String getVersion(Object capsule) {
final Field version = getCapsuleField(capsule, "VERSION");
return (String) get(capsule, version);
}
public static Map getJavaHomes(Object capsule) {
final Field homes = getField(capsule.getClass(), "JAVA_HOMES");
if (homes == null)
return null;
return (Map) get(capsule, homes);
}
private static void setJavaHomes(Class capsuleClass, Map javaHomes) {
final Field homes = getField(capsuleClass, "JAVA_HOMES");
if (homes == null)
return;
set(null, homes, javaHomes);
}
private static Method getCapsuleMethod(Object capsule, String name, Class... paramTypes) {
final Method m = getMethod(capsule.getClass(), name, paramTypes);
if (m == null)
throw new RuntimeException("Could not call " + name + " on " + capsule + ". It does not appear to be a valid capsule.");
return m;
}
private static Field getCapsuleField(Object capsule, String name) {
final Field f = getField(capsule.getClass(), name);
if (f == null)
throw new RuntimeException("Could not find " + name + " on " + capsule + ". It does not appear to be a valid capsule.");
return f;
}
private static Method getMethod(Class clazz, String name, Class... paramTypes) {
try {
final Method method = clazz.getDeclaredMethod(name, paramTypes);
method.setAccessible(true);
return method;
} catch (NoSuchMethodException e) {
return clazz.getSuperclass() != null ? getMethod(clazz.getSuperclass(), name, paramTypes) : null;
}
}
private static Field getField(Class clazz, String name) {
try {
final Field field = clazz.getDeclaredField(name);
field.setAccessible(true);
return field;
} catch (NoSuchFieldException e) {
return clazz.getSuperclass() != null ? getField(clazz.getSuperclass(), name) : null;
}
}
private static Object invoke(Object obj, Method method, Object... params) {
try {
return method.invoke(obj, params);
} catch (IllegalAccessException e) {
throw new AssertionError();
} catch (InvocationTargetException e) {
final Throwable t = e.getTargetException();
if (t instanceof RuntimeException)
throw (RuntimeException) t;
if (t instanceof Error)
throw (Error) t;
throw new RuntimeException(t);
}
}
private static Object get(Object obj, Field field) {
try {
return field.get(obj);
} catch (IllegalAccessException e) {
throw new AssertionError();
}
}
private static void set(Object obj, Field field, Object value) {
try {
field.set(obj, value);
} catch (IllegalAccessException e) {
throw new AssertionError();
}
}
/**
* Adds an option to the JVM arguments to enable JMX connection
*
* @param jvmArgs the JVM args
* @return a new list of JVM args
*/
public static List enableJMX(List jvmArgs) {
final String arg = "-D" + OPT_JMX_REMOTE;
if (jvmArgs.contains(arg))
return jvmArgs;
final List cmdLine2 = new ArrayList<>(jvmArgs);
cmdLine2.add(arg);
return cmdLine2;
}
/**
* Returns the path of the default capsule cache directory
*/
public static Path getDefaultCacheDir() {
final Path cache;
cache = getCacheHome().resolve((isWindows() ? "" : ".") + CACHE_DEFAULT_NAME);
return cache;
}
private static Path getCacheHome() {
final Path userHome = Paths.get(System.getProperty(PROP_USER_HOME));
if (!isWindows())
return userHome;
Path localData;
final String localAppData = System.getenv("LOCALAPPDATA");
if (localAppData != null) {
localData = Paths.get(localAppData);
if (!Files.isDirectory(localData))
throw new RuntimeException("%LOCALAPPDATA% set to nonexistent directory " + localData);
} else {
localData = userHome.resolve(Paths.get("AppData", "Local"));
if (!Files.isDirectory(localData))
localData = userHome.resolve(Paths.get("Local Settings", "Application Data"));
if (!Files.isDirectory(localData))
throw new RuntimeException("%LOCALAPPDATA% is undefined, and neither "
+ userHome.resolve(Paths.get("AppData", "Local")) + " nor "
+ userHome.resolve(Paths.get("Local Settings", "Application Data")) + " have been found");
}
return localData;
}
private static boolean isWindows() {
return System.getProperty(PROP_OS_NAME).toLowerCase().startsWith("windows");
}
private CapsuleLauncher() {
}
}
