下面列出了java.lang.module.Configuration#modules ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
/**
* Checks a configuration and the module-to-loader mapping to ensure that
* no two modules mapped to the same class loader have the same package.
* It also checks that no two automatic modules have the same package.
*
* @throws LayerInstantiationException
*/
private static void checkForDuplicatePkgs(Configuration cf,
Function<String, ClassLoader> clf)
{
// HashMap allows null keys
Map<ClassLoader, Set<String>> loaderToPackages = new HashMap<>();
for (ResolvedModule resolvedModule : cf.modules()) {
ModuleDescriptor descriptor = resolvedModule.reference().descriptor();
ClassLoader loader = clf.apply(descriptor.name());
Set<String> loaderPackages
= loaderToPackages.computeIfAbsent(loader, k -> new HashSet<>());
for (String pkg : descriptor.packages()) {
boolean added = loaderPackages.add(pkg);
if (!added) {
throw fail("More than one module with package %s mapped" +
" to the same class loader", pkg);
}
}
}
}
/**
* 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);
}
}
}
/**
* Checks for split packages between modules defined to the built-in class
* loaders.
*/
private static void checkSplitPackages(Configuration cf,
Function<String, ClassLoader> clf) {
Map<String, String> packageToModule = new HashMap<>();
for (ResolvedModule resolvedModule : cf.modules()) {
ModuleDescriptor descriptor = resolvedModule.reference().descriptor();
String name = descriptor.name();
ClassLoader loader = clf.apply(name);
if (loader == null || loader instanceof BuiltinClassLoader) {
for (String p : descriptor.packages()) {
String other = packageToModule.putIfAbsent(p, name);
if (other != null) {
String msg = "Package " + p + " in both module "
+ name + " and module " + other;
throw new LayerInstantiationException(msg);
}
}
}
}
}
/**
* Checks incubating status of modules in the configuration
*/
private static void checkIncubatingStatus(Configuration cf) {
String incubating = null;
for (ResolvedModule resolvedModule : cf.modules()) {
ModuleReference mref = resolvedModule.reference();
// emit warning if the WARN_INCUBATING module resolution bit set
if (ModuleResolution.hasIncubatingWarning(mref)) {
String mn = mref.descriptor().name();
if (incubating == null) {
incubating = mn;
} else {
incubating += ", " + mn;
}
}
}
if (incubating != null)
warn("Using incubator modules: " + incubating);
}
/**
* 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);
}
/**
* Checks a configuration and the module-to-loader mapping to ensure that
* no two modules mapped to the same class loader have the same package.
* It also checks that no two automatic modules have the same package.
*
* @throws LayerInstantiationException
*/
private static void checkForDuplicatePkgs(Configuration cf,
Function<String, ClassLoader> clf)
{
// HashMap allows null keys
Map<ClassLoader, Set<String>> loaderToPackages = new HashMap<>();
for (ResolvedModule resolvedModule : cf.modules()) {
ModuleDescriptor descriptor = resolvedModule.reference().descriptor();
ClassLoader loader = clf.apply(descriptor.name());
Set<String> loaderPackages
= loaderToPackages.computeIfAbsent(loader, k -> new HashSet<>());
for (String pkg : descriptor.packages()) {
boolean added = loaderPackages.add(pkg);
if (!added) {
throw fail("More than one module with package %s mapped" +
" to the same class loader", pkg);
}
}
}
}
/**
* 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);
}
}
}
/**
* Checks for split packages between modules defined to the built-in class
* loaders.
*/
private static void checkSplitPackages(Configuration cf,
Function<String, ClassLoader> clf) {
Map<String, String> packageToModule = new HashMap<>();
for (ResolvedModule resolvedModule : cf.modules()) {
ModuleDescriptor descriptor = resolvedModule.reference().descriptor();
String name = descriptor.name();
ClassLoader loader = clf.apply(name);
if (loader == null || loader instanceof BuiltinClassLoader) {
for (String p : descriptor.packages()) {
String other = packageToModule.putIfAbsent(p, name);
if (other != null) {
String msg = "Package " + p + " in both module "
+ name + " and module " + other;
throw new LayerInstantiationException(msg);
}
}
}
}
}
/**
* Checks incubating status of modules in the configuration
*/
private static void checkIncubatingStatus(Configuration cf) {
String incubating = null;
for (ResolvedModule resolvedModule : cf.modules()) {
ModuleReference mref = resolvedModule.reference();
// emit warning if the WARN_INCUBATING module resolution bit set
if (ModuleResolution.hasIncubatingWarning(mref)) {
String mn = mref.descriptor().name();
if (incubating == null) {
incubating = mn;
} else {
incubating += ", " + mn;
}
}
}
if (incubating != null)
warn("Using incubator modules: " + incubating);
}
/**
* 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 new module layer by defining the modules in the given {@code
* Configuration} to the Java virtual machine. This method creates one
* class loader and defines all modules to that class loader.
*
* <p> The class loader created by this method implements <em>direct
* delegation</em> when loading classes from modules. If the {@link
* ClassLoader#loadClass(String, boolean) loadClass} method is invoked to
* load a class then it uses the package name of the class to map it to a
* module. This may be a module in this layer and hence defined to the same
* class loader. It may be a package in a module in a parent layer that is
* exported to one or more of the modules in this layer. The class
* loader delegates to the class loader of the module, throwing {@code
* ClassNotFoundException} if not found by that class loader.
* When {@code loadClass} is invoked to load classes that do not map to a
* module then it delegates to the parent class loader. </p>
*
* <p> The class loader created by this method locates resources
* ({@link ClassLoader#getResource(String) getResource}, {@link
* ClassLoader#getResources(String) getResources}, and other resource
* methods) in all modules in the layer before searching the parent class
* loader. </p>
*
* <p> Attempting to create a layer with all modules defined to the same
* class loader can fail for the following reasons:
*
* <ul>
*
* <li><p> <em>Overlapping packages</em>: Two or more modules in the
* configuration have the same package. </p></li>
*
* <li><p> <em>Split delegation</em>: The resulting class loader would
* need to delegate to more than one class loader in order to load
* classes in a specific package. </p></li>
*
* </ul>
*
* <p> In addition, a layer cannot be created if the configuration contains
* a module named "{@code java.base}", or a module contains a package named
* "{@code java}" or a package with a name starting with "{@code java.}". </p>
*
* <p> If there is a security manager then the class loader created by
* this method will load classes and resources with privileges that are
* restricted by the calling context of this method. </p>
*
* @param cf
* The configuration for the layer
* @param parentLayers
* The list of parent layers in search order
* @param parentLoader
* The parent class loader for the class loader created by this
* method; may be {@code null} for the bootstrap class loader
*
* @return A controller that controls the newly created layer
*
* @throws IllegalArgumentException
* If the parent(s) of the given configuration do not match the
* configuration of the parent layers, including order
* @throws LayerInstantiationException
* If all modules cannot be defined to the same class loader for any
* of the reasons listed above
* @throws SecurityException
* If {@code RuntimePermission("createClassLoader")} or
* {@code RuntimePermission("getClassLoader")} is denied by
* the security manager
*
* @see #findLoader
*/
public static Controller defineModulesWithOneLoader(Configuration cf,
List<ModuleLayer> parentLayers,
ClassLoader parentLoader)
{
List<ModuleLayer> parents = new ArrayList<>(parentLayers);
checkConfiguration(cf, parents);
checkCreateClassLoaderPermission();
checkGetClassLoaderPermission();
try {
Loader loader = new Loader(cf.modules(), parentLoader);
loader.initRemotePackageMap(cf, parents);
ModuleLayer layer = new ModuleLayer(cf, parents, mn -> loader);
return new Controller(layer);
} catch (IllegalArgumentException | IllegalStateException e) {
throw new LayerInstantiationException(e.getMessage());
}
}
/**
* Creates a new module layer by defining the modules in the given {@code
* Configuration} to the Java virtual machine. This method creates one
* class loader and defines all modules to that class loader.
*
* <p> The class loader created by this method implements <em>direct
* delegation</em> when loading classes from modules. If the {@link
* ClassLoader#loadClass(String, boolean) loadClass} method is invoked to
* load a class then it uses the package name of the class to map it to a
* module. This may be a module in this layer and hence defined to the same
* class loader. It may be a package in a module in a parent layer that is
* exported to one or more of the modules in this layer. The class
* loader delegates to the class loader of the module, throwing {@code
* ClassNotFoundException} if not found by that class loader.
* When {@code loadClass} is invoked to load classes that do not map to a
* module then it delegates to the parent class loader. </p>
*
* <p> The class loader created by this method locates resources
* ({@link ClassLoader#getResource(String) getResource}, {@link
* ClassLoader#getResources(String) getResources}, and other resource
* methods) in all modules in the layer before searching the parent class
* loader. </p>
*
* <p> Attempting to create a layer with all modules defined to the same
* class loader can fail for the following reasons:
*
* <ul>
*
* <li><p> <em>Overlapping packages</em>: Two or more modules in the
* configuration have the same package. </p></li>
*
* <li><p> <em>Split delegation</em>: The resulting class loader would
* need to delegate to more than one class loader in order to load
* classes in a specific package. </p></li>
*
* </ul>
*
* <p> In addition, a layer cannot be created if the configuration contains
* a module named "{@code java.base}", or a module contains a package named
* "{@code java}" or a package with a name starting with "{@code java.}". </p>
*
* <p> If there is a security manager then the class loader created by
* this method will load classes and resources with privileges that are
* restricted by the calling context of this method. </p>
*
* @param cf
* The configuration for the layer
* @param parentLayers
* The list of parent layers in search order
* @param parentLoader
* The parent class loader for the class loader created by this
* method; may be {@code null} for the bootstrap class loader
*
* @return A controller that controls the newly created layer
*
* @throws IllegalArgumentException
* If the parent configurations do not match the configuration of
* the parent layers, including order
* @throws LayerInstantiationException
* If all modules cannot be defined to the same class loader for any
* of the reasons listed above
* @throws SecurityException
* If {@code RuntimePermission("createClassLoader")} or
* {@code RuntimePermission("getClassLoader")} is denied by
* the security manager
*
* @see #findLoader
*/
public static Controller defineModulesWithOneLoader(Configuration cf,
List<ModuleLayer> parentLayers,
ClassLoader parentLoader)
{
List<ModuleLayer> parents = new ArrayList<>(parentLayers);
checkConfiguration(cf, parents);
checkCreateClassLoaderPermission();
checkGetClassLoaderPermission();
try {
Loader loader = new Loader(cf.modules(), parentLoader);
loader.initRemotePackageMap(cf, parents);
ModuleLayer layer = new ModuleLayer(cf, parents, mn -> loader);
return new Controller(layer);
} catch (IllegalArgumentException | IllegalStateException e) {
throw new LayerInstantiationException(e.getMessage());
}
}