| /* |
| * Copyright (c) 2014, 2016, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| package java.lang.reflect; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.lang.module.Configuration; |
| import java.lang.module.ModuleReference; |
| import java.lang.module.ModuleDescriptor; |
| import java.lang.module.ModuleDescriptor.Exports; |
| import java.lang.module.ModuleDescriptor.Provides; |
| import java.lang.module.ModuleDescriptor.Version; |
| import java.lang.module.ResolvedModule; |
| import java.net.URI; |
| import java.net.URL; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.Optional; |
| import java.util.Set; |
| import java.util.WeakHashMap; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.locks.Lock; |
| import java.util.concurrent.locks.ReadWriteLock; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| import java.util.function.Function; |
| import java.util.stream.Stream; |
| |
| import jdk.internal.loader.BuiltinClassLoader; |
| import jdk.internal.loader.BootLoader; |
| import jdk.internal.misc.JavaLangReflectModuleAccess; |
| import jdk.internal.misc.SharedSecrets; |
| import jdk.internal.module.ServicesCatalog; |
| import jdk.internal.reflect.CallerSensitive; |
| import jdk.internal.reflect.Reflection; |
| import sun.security.util.SecurityConstants; |
| |
| /** |
| * Represents a run-time module, either {@link #isNamed() named} or unnamed. |
| * |
| * <p> Named modules have a {@link #getName() name} and are constructed by the |
| * Java Virtual Machine when a graph of modules is defined to the Java virtual |
| * machine to create a module {@link Layer Layer}. </p> |
| * |
| * <p> An unnamed module does not have a name. There is an unnamed module |
| * per {@link ClassLoader ClassLoader} that is obtained by invoking the class |
| * loader's {@link ClassLoader#getUnnamedModule() getUnnamedModule} method. The |
| * {@link Class#getModule() getModule} method of all types defined by a class |
| * loader that are not in a named module return the class loader's unnamed |
| * module. </p> |
| * |
| * <p> The package names that are parameters or returned by methods defined in |
| * this class are the fully-qualified names of the packages as defined in |
| * section 6.5.3 of <cite>The Java™ Language Specification </cite>, for |
| * example, {@code "java.lang"}. </p> |
| * |
| * <p> Unless otherwise specified, passing a {@code null} argument to a method |
| * in this class causes a {@link NullPointerException NullPointerException} to |
| * be thrown. </p> |
| * |
| * @since 9 |
| * @see java.lang.Class#getModule |
| */ |
| |
| public final class Module { |
| |
| // the layer that contains this module, can be null |
| private final Layer layer; |
| |
| // module name and loader, these fields are read by VM |
| private final String name; |
| private final ClassLoader loader; |
| |
| // the module descriptor |
| private final ModuleDescriptor descriptor; |
| |
| |
| /** |
| * Creates a new named Module. The resulting Module will be defined to the |
| * VM but will not read any other modules, will not have any exports setup |
| * and will not be registered in the service catalog. |
| */ |
| private Module(Layer layer, |
| ClassLoader loader, |
| ModuleDescriptor descriptor, |
| URI uri) |
| { |
| this.layer = layer; |
| this.name = descriptor.name(); |
| this.loader = loader; |
| this.descriptor = descriptor; |
| |
| // define module to VM |
| |
| Set<String> packages = descriptor.packages(); |
| int n = packages.size(); |
| String[] array = new String[n]; |
| int i = 0; |
| for (String pn : packages) { |
| array[i++] = pn.replace('.', '/'); |
| } |
| Version version = descriptor.version().orElse(null); |
| String vs = Objects.toString(version, null); |
| String loc = Objects.toString(uri, null); |
| |
| defineModule0(this, vs, loc, array); |
| } |
| |
| |
| /** |
| * Create the unnamed Module for the given ClassLoader. |
| * |
| * @see ClassLoader#getUnnamedModule |
| */ |
| private Module(ClassLoader loader) { |
| this.layer = null; |
| this.name = null; |
| this.loader = loader; |
| this.descriptor = null; |
| |
| // unnamed modules are loose |
| this.loose = true; |
| } |
| |
| |
| /** |
| * Creates a named module but without defining the module to the VM. |
| * |
| * @apiNote This constructor is for VM white-box testing. |
| */ |
| Module(ClassLoader loader, ModuleDescriptor descriptor) { |
| this.layer = null; |
| this.name = descriptor.name(); |
| this.loader = loader; |
| this.descriptor = descriptor; |
| } |
| |
| |
| |
| /** |
| * Returns {@code true} if this module is a named module. |
| * |
| * @return {@code true} if this is a named module |
| * |
| * @see ClassLoader#getUnnamedModule() |
| */ |
| public boolean isNamed() { |
| return name != null; |
| } |
| |
| /** |
| * Returns the module name or {@code null} if this module is an unnamed |
| * module. |
| * |
| * @return The module name |
| */ |
| public String getName() { |
| return name; |
| } |
| |
| /** |
| * Returns the {@code ClassLoader} for this module. |
| * |
| * <p> If there is a security manager then its {@code checkPermission} |
| * method if first called with a {@code RuntimePermission("getClassLoader")} |
| * permission to check that the caller is allowed to get access to the |
| * class loader. </p> |
| * |
| * @return The class loader for this module |
| * |
| * @throws SecurityException |
| * If denied by the security manager |
| */ |
| public ClassLoader getClassLoader() { |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION); |
| } |
| return loader; |
| } |
| |
| /** |
| * Returns the module descriptor for this module or {@code null} if this |
| * module is an unnamed module. |
| * |
| * @return The module descriptor for this module |
| */ |
| public ModuleDescriptor getDescriptor() { |
| return descriptor; |
| } |
| |
| /** |
| * Returns the layer that contains this module or {@code null} if this |
| * module is not in a layer. |
| * |
| * A module {@code Layer} contains named modules and therefore this |
| * method always returns {@code null} when invoked on an unnamed module. |
| * |
| * <p> <a href="Proxy.html#dynamicmodule">Dynamic modules</a> are named |
| * modules that are generated at runtime. A dynamic module may or may |
| * not be in a module Layer. </p> |
| * |
| * @return The layer that contains this module |
| * |
| * @see Proxy |
| */ |
| public Layer getLayer() { |
| if (isNamed()) { |
| Layer layer = this.layer; |
| if (layer != null) |
| return layer; |
| |
| // special-case java.base as it is created before the boot Layer |
| if (loader == null && name.equals("java.base")) { |
| return SharedSecrets.getJavaLangAccess().getBootLayer(); |
| } |
| } |
| |
| return null; |
| } |
| |
| |
| // -- readability -- |
| |
| // true if this module reads all unnamed modules (a.k.a. loose module) |
| private volatile boolean loose; |
| |
| // the modules that this module permanently reads |
| // (will be final when the modules are defined in reverse topology order) |
| private volatile Set<Module> reads; |
| |
| // created lazily, additional modules that this module reflectively reads |
| private volatile WeakSet<Module> transientReads; |
| |
| |
| /** |
| * Indicates if this module reads the given module. This method returns |
| * {@code true} if invoked to test if this module reads itself. It also |
| * returns {@code true} if invoked on an unnamed module (as unnamed |
| * modules read all modules). |
| * |
| * @param other |
| * The other module |
| * |
| * @return {@code true} if this module reads {@code other} |
| * |
| * @see #addReads(Module) |
| */ |
| public boolean canRead(Module other) { |
| Objects.requireNonNull(other); |
| |
| // an unnamed module reads all modules |
| if (!this.isNamed()) |
| return true; |
| |
| // all modules read themselves |
| if (other == this) |
| return true; |
| |
| // check if this module reads other |
| if (other.isNamed()) { |
| |
| Set<Module> reads = this.reads; // volatile read |
| if (reads != null && reads.contains(other)) |
| return true; |
| |
| } else { |
| |
| // loose modules read all unnamed modules |
| if (this.loose) |
| return true; |
| |
| } |
| |
| // check if this module reads the other module reflectively |
| WeakSet<Module> tr = this.transientReads; // volatile read |
| if (tr != null && tr.contains(other)) |
| return true; |
| |
| return false; |
| } |
| |
| /** |
| * If the caller's module is this module then update this module to read |
| * the given module. |
| * |
| * This method is a no-op if {@code other} is this module (all modules can |
| * read themselves) or this module is an unnamed module (as unnamed modules |
| * read all modules). |
| * |
| * @param other |
| * The other module |
| * |
| * @return this module |
| * |
| * @throws IllegalStateException |
| * If this is a named module and the caller is not this module |
| * |
| * @see #canRead |
| */ |
| @CallerSensitive |
| public Module addReads(Module other) { |
| Objects.requireNonNull(other); |
| if (this.isNamed()) { |
| Module caller = Reflection.getCallerClass().getModule(); |
| if (caller != this) { |
| throw new IllegalStateException(caller + " != " + this); |
| } |
| implAddReads(other, true); |
| } |
| return this; |
| } |
| |
| /** |
| * Updates this module to read another module. |
| * |
| * @apiNote This method is for Proxy use and white-box testing. |
| */ |
| void implAddReads(Module other) { |
| implAddReads(other, true); |
| } |
| |
| /** |
| * Makes the given {@code Module} readable to this module without |
| * notifying the VM. |
| * |
| * @apiNote This method is for VM white-box testing. |
| */ |
| void implAddReadsNoSync(Module other) { |
| implAddReads(other, false); |
| } |
| |
| /** |
| * Makes the given {@code Module} readable to this module. |
| * |
| * If {@code syncVM} is {@code true} then the VM is notified. |
| */ |
| private void implAddReads(Module other, boolean syncVM) { |
| |
| // nothing to do |
| if (other == this || !this.isNamed()) |
| return; |
| |
| // if the other is null then change this module to be loose. |
| if (other == null) { |
| if (syncVM) |
| addReads0(this, null); |
| this.loose = true; |
| return; |
| } |
| |
| // check if we already read this module |
| Set<Module> reads = this.reads; |
| if (reads != null && reads.contains(other)) |
| return; |
| |
| // update VM first, just in case it fails |
| if (syncVM) |
| addReads0(this, other); |
| |
| // add reflective read |
| WeakSet<Module> tr = this.transientReads; |
| if (tr == null) { |
| synchronized (this) { |
| tr = this.transientReads; |
| if (tr == null) { |
| tr = new WeakSet<>(); |
| this.transientReads = tr; |
| } |
| } |
| } |
| tr.add(other); |
| } |
| |
| |
| // -- exports -- |
| |
| // the packages that are permanently exported |
| // (will be final when the modules are defined in reverse topology order) |
| private volatile Map<String, Set<Module>> exports; |
| |
| // created lazily, additional exports added at run-time |
| private volatile Map<String, WeakSet<Module>> transientExports; |
| |
| // the special Module to mean exported to all modules |
| private static final Module EVERYONE_MODULE = new Module(null); |
| private static final Set<Module> EVERYONE = Collections.singleton(EVERYONE_MODULE); |
| |
| // the special Module to mean exported to all unnamed modules |
| private static final Module ALL_UNNAMED_MODULE = new Module(null); |
| |
| |
| /** |
| * Returns {@code true} if this module exports the given package to at |
| * least the given module. |
| * |
| * <p> This method always return {@code true} when invoked on an unnamed |
| * module. </p> |
| * |
| * <p> This method does not check if the given module reads this module </p> |
| * |
| * @param pn |
| * The package name |
| * @param other |
| * The other module |
| * |
| * @return {@code true} if this module exports the package to at least the |
| * given module |
| */ |
| public boolean isExported(String pn, Module other) { |
| Objects.requireNonNull(pn); |
| Objects.requireNonNull(other); |
| return implIsExported(pn, other); |
| } |
| |
| /** |
| * Returns {@code true} if this module exports the given package |
| * unconditionally. |
| * |
| * <p> This method always return {@code true} when invoked on an unnamed |
| * module. </p> |
| * |
| * <p> This method does not check if the given module reads this module </p> |
| * |
| * @param pn |
| * The package name |
| * |
| * @return {@code true} if this module exports the package unconditionally |
| */ |
| public boolean isExported(String pn) { |
| Objects.requireNonNull(pn); |
| return implIsExported(pn, EVERYONE_MODULE); |
| } |
| |
| /** |
| * Returns {@code true} if this module exports the given package to the |
| * given module. If the other module is {@code EVERYONE_MODULE} then |
| * this method tests if the package is exported unconditionally. |
| */ |
| private boolean implIsExported(String pn, Module other) { |
| |
| // all packages are exported by unnamed modules |
| if (!isNamed()) |
| return true; |
| |
| // exported via module declaration/descriptor |
| if (isExportedPermanently(pn, other)) |
| return true; |
| |
| // exported via addExports |
| if (isExportedReflectively(pn, other)) |
| return true; |
| |
| // not exported or not exported to other |
| return false; |
| } |
| |
| /** |
| * Returns {@code true} if this module permanently exports the given |
| * package to the given module. |
| */ |
| private boolean isExportedPermanently(String pn, Module other) { |
| Map<String, Set<Module>> exports = this.exports; |
| if (exports != null) { |
| Set<Module> targets = exports.get(pn); |
| |
| if (targets != null) { |
| |
| // exported to all modules |
| if (targets.contains(EVERYONE_MODULE)) |
| return true; |
| |
| if (other != EVERYONE_MODULE) { |
| // exported to other |
| if (targets.contains(other)) |
| return true; |
| |
| // other is an unnamed module && exported to all unnamed |
| if (!other.isNamed() && targets.contains(ALL_UNNAMED_MODULE)) |
| return true; |
| } |
| |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Returns {@code true} if this module reflectively exports the given |
| * package package to the given module. |
| */ |
| private boolean isExportedReflectively(String pn, Module other) { |
| Map<String, WeakSet<Module>> te = this.transientExports; |
| if (te != null) { |
| WeakSet<Module> targets = te.get(pn); |
| |
| if (targets != null) { |
| |
| // exported to all modules |
| if (targets.contains(EVERYONE_MODULE)) |
| return true; |
| |
| if (other != EVERYONE_MODULE) { |
| |
| // exported to other |
| if (targets.contains(other)) |
| return true; |
| |
| // other is an unnamed module && exported to all unnamed |
| if (!other.isNamed() && targets.contains(ALL_UNNAMED_MODULE)) |
| return true; |
| } |
| } |
| |
| } |
| return false; |
| } |
| |
| |
| /** |
| * If the caller's module is this module then update this module to export |
| * package {@code pn} to the given module. |
| * |
| * <p> This method has no effect if the package is already exported to the |
| * given module. If also has no effect if invoked on an unnamed module (as |
| * unnamed modules export all packages). </p> |
| * |
| * @param pn |
| * The package name |
| * @param other |
| * The module |
| * |
| * @return this module |
| * |
| * @throws IllegalArgumentException |
| * If {@code pn} is {@code null}, or this is a named module and the |
| * package {@code pn} is not a package in this module |
| * @throws IllegalStateException |
| * If this is a named module and the caller is not this module |
| */ |
| @CallerSensitive |
| public Module addExports(String pn, Module other) { |
| if (pn == null) |
| throw new IllegalArgumentException("package is null"); |
| Objects.requireNonNull(other); |
| |
| if (isNamed()) { |
| Module caller = Reflection.getCallerClass().getModule(); |
| if (caller != this) { |
| throw new IllegalStateException(caller + " != " + this); |
| } |
| implAddExports(pn, other, true); |
| } |
| |
| return this; |
| } |
| |
| /** |
| * Updates the exports so that package {@code pn} is exported to module |
| * {@code other} but without notifying the VM. |
| * |
| * @apiNote This method is for VM white-box testing. |
| */ |
| void implAddExportsNoSync(String pn, Module other) { |
| if (other == null) |
| other = EVERYONE_MODULE; |
| implAddExports(pn.replace('/', '.'), other, false); |
| } |
| |
| /** |
| * Updates the exports so that package {@code pn} is exported to module |
| * {@code other}. |
| * |
| * @apiNote This method is for white-box testing. |
| */ |
| void implAddExports(String pn, Module other) { |
| implAddExports(pn, other, true); |
| } |
| |
| /** |
| * Updates the exports so that package {@code pn} is exported to module |
| * {@code other}. |
| * |
| * If {@code syncVM} is {@code true} then the VM is notified. |
| */ |
| private void implAddExports(String pn, Module other, boolean syncVM) { |
| Objects.requireNonNull(other); |
| Objects.requireNonNull(pn); |
| |
| // unnamed modules export all packages |
| if (!isNamed()) |
| return; |
| |
| // nothing to do if already exported to other |
| if (implIsExported(pn, other)) |
| return; |
| |
| // can only export a package in the module |
| if (!containsPackage(pn)) { |
| throw new IllegalArgumentException("package " + pn |
| + " not in contents"); |
| } |
| |
| // update VM first, just in case it fails |
| if (syncVM) { |
| String pkgInternalForm = pn.replace('.', '/'); |
| if (other == EVERYONE_MODULE) { |
| addExportsToAll0(this, pkgInternalForm); |
| } else if (other == ALL_UNNAMED_MODULE) { |
| addExportsToAllUnnamed0(this, pkgInternalForm); |
| } else { |
| addExports0(this, pkgInternalForm, other); |
| } |
| } |
| |
| // create transientExports if needed |
| Map<String, WeakSet<Module>> te = this.transientExports; // read |
| if (te == null) { |
| synchronized (this) { |
| te = this.transientExports; |
| if (te == null) { |
| te = new ConcurrentHashMap<>(); |
| this.transientExports = te; // volatile write |
| } |
| } |
| } |
| |
| // add package name to transientExports if absent |
| WeakSet<Module> s = te.get(pn); |
| if (s == null) { |
| s = new WeakSet<>(); |
| WeakSet<Module> prev = te.putIfAbsent(pn, s); |
| if (prev != null) |
| s = prev; |
| } |
| s.add(other); |
| } |
| |
| |
| // -- services -- |
| |
| // created lazily, additional service types that this module uses |
| private volatile WeakSet<Class<?>> transientUses; |
| |
| /** |
| * If the caller's module is this module then update this module to add a |
| * service dependence on the given service type. This method is intended |
| * for use by frameworks that invoke {@link java.util.ServiceLoader |
| * ServiceLoader} on behalf of other modules or where the framework is |
| * passed a reference to the service type by other code. This method is |
| * a no-op when invoked on an unnamed module. |
| * |
| * <p> This method does not cause {@link |
| * Configuration#resolveRequiresAndUses resolveRequiresAndUses} to be |
| * re-run. </p> |
| * |
| * @param st |
| * The service type |
| * |
| * @return this module |
| * |
| * @throws IllegalStateException |
| * If this is a named module and the caller is not this module |
| * |
| * @see #canUse(Class) |
| * @see ModuleDescriptor#uses() |
| */ |
| @CallerSensitive |
| public Module addUses(Class<?> st) { |
| Objects.requireNonNull(st); |
| |
| if (isNamed()) { |
| |
| Module caller = Reflection.getCallerClass().getModule(); |
| if (caller != this) { |
| throw new IllegalStateException(caller + " != " + this); |
| } |
| |
| if (!canUse(st)) { |
| WeakSet<Class<?>> uses = this.transientUses; |
| if (uses == null) { |
| synchronized (this) { |
| uses = this.transientUses; |
| if (uses == null) { |
| uses = new WeakSet<>(); |
| this.transientUses = uses; |
| } |
| } |
| } |
| uses.add(st); |
| } |
| |
| } |
| |
| return this; |
| } |
| |
| /** |
| * Indicates if this module has a service dependence on the given service |
| * type. This method always returns {@code true} when invoked on an unnamed |
| * module. |
| * |
| * @param st |
| * The service type |
| * |
| * @return {@code true} if this module uses service type {@code st} |
| * |
| * @see #addUses(Class) |
| */ |
| public boolean canUse(Class<?> st) { |
| Objects.requireNonNull(st); |
| |
| if (!isNamed()) |
| return true; |
| |
| if (descriptor.isAutomatic()) |
| return true; |
| |
| // uses was declared |
| if (descriptor.uses().contains(st.getName())) |
| return true; |
| |
| // uses added via addUses |
| WeakSet<Class<?>> uses = this.transientUses; |
| if (uses != null && uses.contains(st)) |
| return true; |
| |
| return false; |
| } |
| |
| |
| |
| // -- packages -- |
| |
| // Additional packages that are added to the module at run-time. |
| // The field is volatile as it may be replaced at run-time |
| private volatile Set<String> extraPackages; |
| |
| private boolean containsPackage(String pn) { |
| if (descriptor.packages().contains(pn)) |
| return true; |
| Set<String> extraPackages = this.extraPackages; |
| if (extraPackages != null && extraPackages.contains(pn)) |
| return true; |
| return false; |
| } |
| |
| |
| /** |
| * Returns an array of the package names of the packages in this module. |
| * |
| * <p> For named modules, the returned array contains an element for each |
| * package in the module. It may contain elements corresponding to packages |
| * added to the module, <a href="Proxy.html#dynamicmodule">dynamic modules</a> |
| * for example, after it was loaded. |
| * |
| * <p> For unnamed modules, this method is the equivalent of invoking the |
| * {@link ClassLoader#getDefinedPackages() getDefinedPackages} method of |
| * this module's class loader and returning the array of package names. </p> |
| * |
| * <p> A package name appears at most once in the returned array. </p> |
| * |
| * @apiNote This method returns an array rather than a {@code Set} for |
| * consistency with other {@code java.lang.reflect} types. |
| * |
| * @return an array of the package names of the packages in this module |
| */ |
| public String[] getPackages() { |
| if (isNamed()) { |
| |
| Set<String> packages = descriptor.packages(); |
| Set<String> extraPackages = this.extraPackages; |
| if (extraPackages == null) { |
| return packages.toArray(new String[0]); |
| } else { |
| return Stream.concat(packages.stream(), |
| extraPackages.stream()) |
| .toArray(String[]::new); |
| } |
| |
| } else { |
| // unnamed module |
| Stream<Package> packages; |
| if (loader == null) { |
| packages = BootLoader.packages(); |
| } else { |
| packages = SharedSecrets.getJavaLangAccess().packages(loader); |
| } |
| return packages.map(Package::getName).toArray(String[]::new); |
| } |
| } |
| |
| /** |
| * Add a package to this module. |
| * |
| * @apiNote This method is for Proxy use. |
| * |
| * @apiNote This is an expensive operation, not expected to be used often. |
| * At this time then it does not validate that the package name is a |
| * valid java identifier. |
| */ |
| void addPackage(String pn) { |
| implAddPackage(pn, true); |
| } |
| |
| /** |
| * Add a package to this module without notifying the VM. |
| * |
| * @apiNote This method is VM white-box testing. |
| */ |
| void implAddPackageNoSync(String pn) { |
| implAddPackage(pn.replace('/', '.'), false); |
| } |
| |
| /** |
| * Add a package to this module. |
| * |
| * If {@code syncVM} is {@code true} then the VM is notified. |
| */ |
| private void implAddPackage(String pn, boolean syncVM) { |
| if (pn.length() == 0) |
| throw new IllegalArgumentException("<unnamed> package not allowed"); |
| |
| if (descriptor.packages().contains(pn)) { |
| // already in module |
| return; |
| } |
| |
| Set<String> extraPackages = this.extraPackages; |
| if (extraPackages != null && extraPackages.contains(pn)) { |
| // already added |
| return; |
| } |
| synchronized (this) { |
| // recheck under lock |
| extraPackages = this.extraPackages; |
| if (extraPackages != null) { |
| if (extraPackages.contains(pn)) { |
| // already added |
| return; |
| } |
| |
| // copy the set |
| extraPackages = new HashSet<>(extraPackages); |
| extraPackages.add(pn); |
| } else { |
| extraPackages = Collections.singleton(pn); |
| } |
| |
| // update VM first, just in case it fails |
| if (syncVM) |
| addPackage0(this, pn.replace('.', '/')); |
| |
| // replace with new set |
| this.extraPackages = extraPackages; // volatile write |
| } |
| } |
| |
| |
| // -- creating Module objects -- |
| |
| /** |
| * Find the runtime Module corresponding to the given ReadDependence |
| * in the given parent Layer (or its parents). |
| */ |
| private static Module find(ResolvedModule resolvedModule, Layer layer) { |
| Configuration cf = resolvedModule.configuration(); |
| String dn = resolvedModule.name(); |
| |
| Module m = null; |
| while (layer != null) { |
| if (layer.configuration() == cf) { |
| Optional<Module> om = layer.findModule(dn); |
| m = om.get(); |
| assert m.getLayer() == layer; |
| break; |
| } |
| layer = layer.parent().orElse(null); |
| } |
| return m; |
| } |
| |
| /** |
| * Defines each of the module in the given configuration to the runtime. |
| * |
| * @return a map of module name to runtime {@code Module} |
| * |
| * @throws IllegalArgumentException |
| * If defining any of the modules to the VM fails |
| */ |
| static Map<String, Module> defineModules(Configuration cf, |
| Function<String, ClassLoader> clf, |
| Layer layer) |
| { |
| Map<String, Module> modules = new HashMap<>(); |
| Map<String, ClassLoader> loaders = new HashMap<>(); |
| |
| // define each module in the configuration to the VM |
| for (ResolvedModule resolvedModule : cf.modules()) { |
| ModuleReference mref = resolvedModule.reference(); |
| ModuleDescriptor descriptor = mref.descriptor(); |
| String name = descriptor.name(); |
| ClassLoader loader = clf.apply(name); |
| URI uri = mref.location().orElse(null); |
| |
| Module m; |
| if (loader == null && name.equals("java.base")) { |
| m = Object.class.getModule(); |
| } else { |
| m = new Module(layer, loader, descriptor, uri); |
| } |
| |
| modules.put(name, m); |
| loaders.put(name, loader); |
| } |
| |
| // setup readability and exports |
| for (ResolvedModule resolvedModule : cf.modules()) { |
| ModuleReference mref = resolvedModule.reference(); |
| ModuleDescriptor descriptor = mref.descriptor(); |
| |
| String mn = descriptor.name(); |
| Module m = modules.get(mn); |
| assert m != null; |
| |
| // reads |
| Set<Module> reads = new HashSet<>(); |
| for (ResolvedModule d : resolvedModule.reads()) { |
| Module m2; |
| if (d.configuration() == cf) { |
| String dn = d.reference().descriptor().name(); |
| m2 = modules.get(dn); |
| assert m2 != null; |
| } else { |
| m2 = find(d, layer.parent().orElse(null)); |
| } |
| |
| reads.add(m2); |
| |
| // update VM view |
| addReads0(m, m2); |
| } |
| m.reads = reads; |
| |
| // automatic modules reads all unnamed modules |
| if (descriptor.isAutomatic()) { |
| m.implAddReads(null, true); |
| } |
| |
| // exports |
| Map<String, Set<Module>> exports = new HashMap<>(); |
| for (Exports export : descriptor.exports()) { |
| String source = export.source(); |
| String sourceInternalForm = source.replace('.', '/'); |
| |
| if (export.isQualified()) { |
| |
| // qualified export |
| Set<Module> targets = new HashSet<>(); |
| for (String target : export.targets()) { |
| // only export to modules that are in this configuration |
| Module m2 = modules.get(target); |
| if (m2 != null) { |
| targets.add(m2); |
| addExports0(m, sourceInternalForm, m2); |
| } |
| } |
| if (!targets.isEmpty()) { |
| exports.put(source, targets); |
| } |
| |
| } else { |
| |
| // unqualified export |
| exports.put(source, EVERYONE); |
| addExportsToAll0(m, sourceInternalForm); |
| } |
| } |
| m.exports = exports; |
| } |
| |
| // register the modules in the service catalog if they provide services |
| for (ResolvedModule resolvedModule : cf.modules()) { |
| ModuleReference mref = resolvedModule.reference(); |
| ModuleDescriptor descriptor = mref.descriptor(); |
| Map<String, Provides> services = descriptor.provides(); |
| if (!services.isEmpty()) { |
| String name = descriptor.name(); |
| Module m = modules.get(name); |
| ClassLoader loader = loaders.get(name); |
| ServicesCatalog catalog; |
| if (loader == null) { |
| catalog = BootLoader.getServicesCatalog(); |
| } else { |
| catalog = SharedSecrets.getJavaLangAccess() |
| .createOrGetServicesCatalog(loader); |
| } |
| catalog.register(m); |
| } |
| } |
| |
| return modules; |
| } |
| |
| |
| // -- misc -- |
| |
| |
| /** |
| * Returns an input stream for reading a resource in this module. Returns |
| * {@code null} if the resource is not in this module or access to the |
| * resource is denied by the security manager. |
| * The {@code name} is a {@code '/'}-separated path name that identifies |
| * the resource. |
| * |
| * <p> If this module is an unnamed module, and the {@code ClassLoader} for |
| * this module is not {@code null}, then this method is equivalent to |
| * invoking the {@link ClassLoader#getResourceAsStream(String) |
| * getResourceAsStream} method on the class loader for this module. |
| * |
| * @param name |
| * The resource name |
| * |
| * @return An input stream for reading the resource or {@code null} |
| * |
| * @throws IOException |
| * If an I/O error occurs |
| * |
| * @see java.lang.module.ModuleReader#open(String) |
| */ |
| public InputStream getResourceAsStream(String name) throws IOException { |
| Objects.requireNonNull(name); |
| |
| URL url = null; |
| |
| if (isNamed()) { |
| String mn = this.name; |
| |
| // special-case built-in class loaders to avoid URL connection |
| if (loader == null) { |
| return BootLoader.findResourceAsStream(mn, name); |
| } else if (loader instanceof BuiltinClassLoader) { |
| return ((BuiltinClassLoader) loader).findResourceAsStream(mn, name); |
| } |
| |
| // use SharedSecrets to invoke protected method |
| url = SharedSecrets.getJavaLangAccess().findResource(loader, mn, name); |
| |
| } else { |
| |
| // unnamed module |
| if (loader == null) { |
| url = BootLoader.findResource(name); |
| } else { |
| return loader.getResourceAsStream(name); |
| } |
| |
| } |
| |
| // fallthrough to URL case |
| if (url != null) { |
| try { |
| return url.openStream(); |
| } catch (SecurityException e) { } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Returns the string representation of this module. For a named module, |
| * the representation is the string {@code "module"}, followed by a space, |
| * and then the module name. For an unnamed module, the representation is |
| * the string {@code "unnamed module"}, followed by a space, and then an |
| * implementation specific identifier for the unnamed module. |
| * |
| * @return The string representation of this module |
| */ |
| @Override |
| public String toString() { |
| if (isNamed()) { |
| return "module " + name; |
| } else { |
| String id = Integer.toHexString(System.identityHashCode(this)); |
| return "unnamed module @" + id; |
| } |
| } |
| |
| |
| // -- supporting classes -- |
| |
| |
| /** |
| * A "not-a-Set" set of weakly referenced objects that supports concurrent |
| * access. |
| */ |
| private static class WeakSet<E> { |
| private final ReadWriteLock lock = new ReentrantReadWriteLock(); |
| private final Lock readLock = lock.readLock(); |
| private final Lock writeLock = lock.writeLock(); |
| |
| private final WeakHashMap<E, Boolean> map = new WeakHashMap<>(); |
| |
| /** |
| * Adds the specified element to the set. |
| */ |
| void add(E e) { |
| writeLock.lock(); |
| try { |
| map.put(e, Boolean.TRUE); |
| } finally { |
| writeLock.unlock(); |
| } |
| } |
| |
| /** |
| * Returns {@code true} if this set contains the specified element. |
| */ |
| boolean contains(E e) { |
| readLock.lock(); |
| try { |
| return map.containsKey(e); |
| } finally { |
| readLock.unlock(); |
| } |
| } |
| } |
| |
| |
| // -- native methods -- |
| |
| // JVM_DefineModule |
| private static native void defineModule0(Module module, |
| String version, |
| String location, |
| String[] pns); |
| |
| // JVM_AddReadsModule |
| private static native void addReads0(Module from, Module to); |
| |
| // JVM_AddModuleExports |
| private static native void addExports0(Module from, String pn, Module to); |
| |
| // JVM_AddModuleExportsToAll |
| private static native void addExportsToAll0(Module from, String pn); |
| |
| // JVM_AddModuleExportsToAllUnnamed |
| private static native void addExportsToAllUnnamed0(Module from, String pn); |
| |
| // JVM_AddModulePackage |
| private static native void addPackage0(Module m, String pn); |
| |
| /** |
| * Register shared secret to provide access to package-private methods |
| */ |
| static { |
| SharedSecrets.setJavaLangReflectModuleAccess( |
| new JavaLangReflectModuleAccess() { |
| @Override |
| public Module defineUnnamedModule(ClassLoader loader) { |
| return new Module(loader); |
| } |
| @Override |
| public Module defineModule(ClassLoader loader, |
| ModuleDescriptor descriptor, |
| URI uri) { |
| return new Module(null, loader, descriptor, uri); |
| } |
| @Override |
| public void addReads(Module m1, Module m2) { |
| m1.implAddReads(m2, true); |
| } |
| @Override |
| public void addExports(Module m, String pn, Module other) { |
| m.implAddExports(pn, Objects.requireNonNull(other), true); |
| } |
| @Override |
| public void addExportsToAll(Module m, String pn) { |
| m.implAddExports(pn, Module.EVERYONE_MODULE, true); |
| } |
| @Override |
| public void addExportsToAllUnnamed(Module m, String pn) { |
| m.implAddExports(pn, Module.ALL_UNNAMED_MODULE, true); |
| } |
| @Override |
| public void addPackage(Module m, String pn) { |
| m.implAddPackage(pn, true); |
| } |
| }); |
| } |
| } |