java.lang.module.ResolvedModule#name ( )源码实例Demo

/**
 * Creates a {@code Loader} in a loader pool that loads classes/resources
 * from one module.
 */
public Loader(ResolvedModule resolvedModule,
              LoaderPool pool,
              ClassLoader parent)
{
    super("Loader-" + resolvedModule.name(), parent);

    this.pool = pool;
    this.parent = parent;

    ModuleReference mref = resolvedModule.reference();
    ModuleDescriptor descriptor = mref.descriptor();
    String mn = descriptor.name();
    this.nameToModule = Map.of(mn, mref);

    Map<String, LoadedModule> localPackageToModule = new HashMap<>();
    LoadedModule lm = new LoadedModule(mref);
    descriptor.packages().forEach(pn -> localPackageToModule.put(pn, lm));
    this.localPackageToModule = localPackageToModule;

    this.acc = AccessController.getContext();
}
 

/**
 * Creates a pool of class loaders. Each module in the given configuration
 * is mapped to its own class loader in the pool. The class loader is
 * created with the given parent class loader as its parent.
 */
public LoaderPool(Configuration cf,
                  List<ModuleLayer> parentLayers,
                  ClassLoader parentLoader)
{
    Map<String, Loader> loaders = new HashMap<>();
    for (ResolvedModule resolvedModule : cf.modules()) {
        Loader loader = new Loader(resolvedModule, this, parentLoader);
        String mn = resolvedModule.name();
        loaders.put(mn, loader);
    }
    this.loaders = loaders;

    // complete the initialization
    loaders.values().forEach(l -> l.initRemotePackageMap(cf, parentLayers));
}
 

/**
 * Load/register the modules to the built-in class loaders.
 */
private static void loadModules(Configuration cf,
                                Function<String, ClassLoader> clf) {
    for (ResolvedModule resolvedModule : cf.modules()) {
        ModuleReference mref = resolvedModule.reference();
        String name = resolvedModule.name();
        ClassLoader loader = clf.apply(name);
        if (loader == null) {
            // skip java.base as it is already loaded
            if (!name.equals(JAVA_BASE)) {
                BootLoader.loadModule(mref);
            }
        } else if (loader instanceof BuiltinClassLoader) {
            ((BuiltinClassLoader) loader).loadModule(mref);
        }
    }
}
 

/**
 * Returns the function to map modules in the given configuration to the
 * built-in class loaders.
 */
static Function<String, ClassLoader> mappingFunction(Configuration cf) {
    Set<String> bootModules = bootModules();
    Set<String> platformModules = platformModules();

    ClassLoader platformClassLoader = ClassLoaders.platformClassLoader();
    ClassLoader appClassLoader = ClassLoaders.appClassLoader();

    Map<String, ClassLoader> map = new HashMap<>();
    for (ResolvedModule resolvedModule : cf.modules()) {
        String mn = resolvedModule.name();
        if (!bootModules.contains(mn)) {
            if (platformModules.contains(mn)) {
                map.put(mn, platformClassLoader);
            } else {
                map.put(mn, appClassLoader);
            }
        }
    }
    return new Mapper(map);
}
 

/**
 * Creates a {@code Loader} in a loader pool that loads classes/resources
 * from one module.
 */
public Loader(ResolvedModule resolvedModule,
              LoaderPool pool,
              ClassLoader parent)
{
    super("Loader-" + resolvedModule.name(), parent);

    this.pool = pool;
    this.parent = parent;

    ModuleReference mref = resolvedModule.reference();
    ModuleDescriptor descriptor = mref.descriptor();
    String mn = descriptor.name();
    this.nameToModule = Map.of(mn, mref);

    Map<String, LoadedModule> localPackageToModule = new HashMap<>();
    LoadedModule lm = new LoadedModule(mref);
    descriptor.packages().forEach(pn -> localPackageToModule.put(pn, lm));
    this.localPackageToModule = localPackageToModule;

    this.acc = AccessController.getContext();
}
 

/**
 * Creates a pool of class loaders. Each module in the given configuration
 * will be loaded its own class loader in the pool. The class loader is
 * created with the given parent class loader as its parent.
 */
public LoaderPool(Configuration cf,
                  List<ModuleLayer> parentLayers,
                  ClassLoader parentLoader)
{
    Map<String, Loader> loaders = new HashMap<>();
    for (ResolvedModule resolvedModule : cf.modules()) {
        Loader loader = new Loader(resolvedModule, this, parentLoader);
        String mn = resolvedModule.name();
        loaders.put(mn, loader);
    }
    this.loaders = loaders;

    // complete the initialization
    loaders.values().forEach(l -> l.initRemotePackageMap(cf, parentLayers));
}
 

/**
 * Load/register the modules to the built-in class loaders.
 */
private static void loadModules(Configuration cf,
                                Function<String, ClassLoader> clf) {
    for (ResolvedModule resolvedModule : cf.modules()) {
        ModuleReference mref = resolvedModule.reference();
        String name = resolvedModule.name();
        ClassLoader loader = clf.apply(name);
        if (loader == null) {
            // skip java.base as it is already loaded
            if (!name.equals(JAVA_BASE)) {
                BootLoader.loadModule(mref);
            }
        } else if (loader instanceof BuiltinClassLoader) {
            ((BuiltinClassLoader) loader).loadModule(mref);
        }
    }
}
 

/**
 * Returns the function to map modules in the given configuration to the
 * built-in class loaders.
 */
static Function<String, ClassLoader> mappingFunction(Configuration cf) {
    Set<String> bootModules = bootModules();
    Set<String> platformModules = platformModules();

    ClassLoader platformClassLoader = ClassLoaders.platformClassLoader();
    ClassLoader appClassLoader = ClassLoaders.appClassLoader();

    Map<String, ClassLoader> map = new HashMap<>();
    for (ResolvedModule resolvedModule : cf.modules()) {
        String mn = resolvedModule.name();
        if (!bootModules.contains(mn)) {
            if (platformModules.contains(mn)) {
                map.put(mn, platformClassLoader);
            } else {
                map.put(mn, appClassLoader);
            }
        }
    }
    return new Mapper(map);
}