Package org.apache.nutch.plugin

Class PluginClassLoader

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

org.apache.nutch.plugin.PluginClassLoader

All Implemented Interfaces:

Closeable, AutoCloseable

public class PluginClassLoader
extends URLClassLoader

The PluginClassLoader is a child-first classloader that only contains classes of the runtime libraries setuped in the plugin manifest file and exported libraries of plugins that are required plugins. Libraries can be exported or not. Not exported libraries are only used in the plugin own PluginClassLoader. Exported libraries are available for PluginClassLoader of plugins that depends on these plugins.

Constructor Summary

Constructors

Constructor	Description
PluginClassLoader(URL[] urls, ClassLoader parent)	Overloaded constructor

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
URL	getResource(String name)
InputStream	getResourceAsStream(String name)
Enumeration<URL>	getResources(String name)
int	hashCode()
protected Class<?>	loadClass(String name, boolean resolve)

Methods inherited from class java.net.URLClassLoader

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

Methods inherited from class java.security.SecureClassLoader

defineClass, defineClass

Methods inherited from class 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

Methods inherited from class java.lang.Object

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

Constructor Details

PluginClassLoader

public PluginClassLoader(URL[] urls,
 ClassLoader parent)

Overloaded constructor

Parameters:

urls - Array of urls with own libraries and all exported libraries of plugins that are required for this plugin

parent - the parent ClassLoader responsible for loading classes defined in urls.

Method Details

loadClass

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

Overrides:

loadClass in class ClassLoader

Throws:

ClassNotFoundException

getResource

public URL getResource(String name)

Overrides:

getResource in class ClassLoader

getResources

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

Overrides:

getResources in class ClassLoader

Throws:

IOException

getResourceAsStream

public InputStream getResourceAsStream(String name)

Overrides:

getResourceAsStream in class URLClassLoader

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object