程序包 io.esastack.cabin.container.service.loader

类 AbstractClassLoader

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

io.esastack.cabin.container.service.loader.AbstractClassLoader

所有已实现的接口:

Closeable, AutoCloseable

直接已知子类:

BizModuleClassLoader, JavaAgentClassLoader, LibModuleClassLoader

public abstract class AbstractClassLoader
extends URLClassLoader

字段概要

字段

修饰符和类型	字段	说明
protected ClassLoaderService	classLoaderService
protected String	moduleName
protected SharedClassService	sharedClassService
protected SharedResourceService	sharedResourceService

构造器概要

构造器

构造器	说明
AbstractClassLoader(String moduleName, URL[] urls)

方法概要

修饰符和类型	方法	说明
protected void	debugClassLoadMessage(Class<?> clazz, String method, String className)
protected URL	getBizResource(String name)
protected Enumeration<URL>	getBizResources(String name)
protected URL	getExportResource(String name)
protected Enumeration<URL>	getExportResources(String name)
protected URL	getJavaAgentResource(String name)	One useful example is that when javassist is used with jdk11, the ClassLoader::getResource is used to determine whether a class exists while compiling new classes.
protected Enumeration<URL>	getJavaAgentResources(String name)	Why we need to load Agent Resources: 1.
protected URL	getJdkResource(String name)
protected Enumeration<URL>	getJdkResources(String name)
protected URL	getLocalResource(String name)
protected Enumeration<URL>	getLocalResources(String name)
String	getModuleName()
URL	getResource(String name)
protected abstract URL	getResource0(String name)	Pay attention to the priority of finding resource: jdk, exported, biz
Enumeration<URL>	getResources(String name)
protected abstract Enumeration<URL>	getResources0(String name)	Pay attention to the priority of finding resource: jdk, exported, biz
protected Class<?>	loadAgentClass(String name)	* Why we need to load Agent Classes: The classes in agent jars may be used to enhance the Biz classes and Lib classes, using javassist or asm; So the agent classes and methods may appear in the enhanced class byte code, while these classes being executing, the agent classes would be loaded by the Classloader of the caller class.
protected Class<?>	loadBizClass(String name)
protected Class<?>	loadCabinClass(String name)
protected Class<?>	loadClass(String name, boolean resolve)
protected abstract Class<?>	loadClass0(String name, boolean resolve)
Class<?>	loadClassFromClasspath(String name)
protected Class<?>	loadFromRecords(String name)
protected Class<?>	loadImportClassFromBiz(String name)
protected Class<?>	loadJdkClass(String name)
protected Class<?>	loadLocalClass(String name)
protected Class<?>	loadSharedClass(String name)
protected boolean	shouldImportClassFromBiz(String name)

从类继承的方法 java.net.URLClassLoader

addURL, close, definePackage, findClass, findResource, findResources, getPermissions, getResourceAsStream, getURLs, newInstance, newInstance

从类继承的方法 java.security.SecureClassLoader

defineClass, defineClass

从类继承的方法 java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findResource, findSystemClass, getClassLoadingLock, getDefinedPackage, getDefinedPackages, getName, getPackage, getPackages, getParent, getPlatformClassLoader, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, getUnnamedModule, isRegisteredAsParallelCapable, loadClass, registerAsParallelCapable, resolveClass, resources, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

moduleName

protected final String moduleName

classLoaderService

protected final ClassLoaderService classLoaderService

sharedClassService

protected final SharedClassService sharedClassService

sharedResourceService

protected final SharedResourceService sharedResourceService

构造器详细资料

AbstractClassLoader

public AbstractClassLoader(String moduleName,
                           URL[] urls)

方法详细资料

getModuleName

public String getModuleName()

loadClass

protected Class<?> loadClass(String name,
                             boolean resolve)
                      throws CabinLoaderException

覆盖:

loadClass 在类中 ClassLoader

抛出:

CabinLoaderException

getResources

public Enumeration<URL> getResources(String name)
                              throws IOException

覆盖:

getResources 在类中 ClassLoader

抛出:

IOException

getResource

public URL getResource(String name)

覆盖:

getResource 在类中 ClassLoader

loadClass0

protected abstract Class<?> loadClass0(String name,
                                       boolean resolve)
                                throws CabinLoaderException

抛出:

CabinLoaderException

getResources0

protected abstract Enumeration<URL> getResources0(String name)
                                           throws IOException

Pay attention to the priority of finding resource: jdk, exported, biz

抛出:

IOException

getResource0

protected abstract URL getResource0(String name)

Pay attention to the priority of finding resource: jdk, exported, biz

loadClassFromClasspath

public Class<?> loadClassFromClasspath(String name)
                                throws CabinLoaderException

抛出:

CabinLoaderException

loadImportClassFromBiz

protected Class<?> loadImportClassFromBiz(String name)
                                   throws CabinLoaderException

抛出:

CabinLoaderException

loadFromRecords

protected Class<?> loadFromRecords(String name)
                            throws CabinLoaderException

抛出:

CabinLoaderException

loadJdkClass

protected Class<?> loadJdkClass(String name)
                         throws CabinLoaderException

抛出:

CabinLoaderException

loadCabinClass

protected Class<?> loadCabinClass(String name)
                           throws CabinLoaderException

抛出:

CabinLoaderException

loadSharedClass

protected Class<?> loadSharedClass(String name)
                            throws CabinLoaderException

抛出:

CabinLoaderException

loadBizClass

protected Class<?> loadBizClass(String name)
                         throws CabinLoaderException

抛出:

CabinLoaderException

loadLocalClass

protected Class<?> loadLocalClass(String name)
                           throws CabinLoaderException

抛出:

CabinLoaderException

loadAgentClass

protected Class<?> loadAgentClass(String name)
                           throws CabinLoaderException

* Why we need to load Agent Classes: The classes in agent jars may be used to enhance the Biz classes and Lib classes, using javassist or asm; So the agent classes and methods may appear in the enhanced class byte code, while these classes being executing, the agent classes would be loaded by the Classloader of the caller class. Here, only classes in agent local classpath should be loaded.

参数:

name - classname to be loaded

返回:

Class object

抛出:

CabinLoaderException - if multiple classed loaed from different agents

getJdkResources

protected Enumeration<URL> getJdkResources(String name)
                                    throws IOException

抛出:

IOException

getLocalResources

protected Enumeration<URL> getLocalResources(String name)
                                      throws IOException

抛出:

IOException

getExportResources

protected Enumeration<URL> getExportResources(String name)
                                       throws IOException

抛出:

IOException

getBizResources

protected Enumeration<URL> getBizResources(String name)
                                    throws IOException

抛出:

IOException

getJavaAgentResources

protected Enumeration<URL> getJavaAgentResources(String name)
                                          throws IOException

Why we need to load Agent Resources: 1. Agent may implement some SPI of biz and lib module, to load these implementations, the resource files must can be found by biz and lib module classloader; 2. Just for found some resource bringing by agent file.

抛出:

IOException

getJdkResource

protected URL getJdkResource(String name)

getLocalResource

protected URL getLocalResource(String name)

getExportResource

protected URL getExportResource(String name)

getBizResource

protected URL getBizResource(String name)

getJavaAgentResource

protected URL getJavaAgentResource(String name)

One useful example is that when javassist is used with jdk11, the ClassLoader::getResource is used to determine whether a class exists while compiling new classes.

shouldImportClassFromBiz

protected boolean shouldImportClassFromBiz(String name)

debugClassLoadMessage

protected void debugClassLoadMessage(Class<?> clazz,
                                     String method,
                                     String className)