net.dpml.depot
Class DepotRMIClassLoaderSpi

java.lang.Object
  java.rmi.server.RMIClassLoaderSpi
      net.dpml.depot.DepotRMIClassLoaderSpi

public class DepotRMIClassLoaderSpi

extends RMIClassLoaderSpi

The DepotRMIClassLoaderSpi handles the loading of classes that are based on plugin artifact types.

Version:

1.0.2

Author:

Digital Product Meta Library

Constructor Summary

DepotRMIClassLoaderSpi()
Default constructor.

Method Summary

String	getClassAnnotation(Class cl) Provides the implementation for RMIClassLoader.getClassAnnotation(Class).
ClassLoader	getClassLoader(String codebase) Provides the implementation for RMIClassLoader.getClassLoader(String).
Class	loadClass(String codebase, String name, ClassLoader defaultLoader) Provides the implementation for RMIClassLoader.loadClass(URL,String), RMIClassLoader.loadClass(String,String), and RMIClassLoader.loadClass(String,String,ClassLoader).
Class	loadProxyClass(String codebase, String[] interfaces, ClassLoader defaultLoader) Provides the implementation for RMIClassLoader.loadProxyClass(String,String[],ClassLoader).

Methods inherited from class java.lang.Object

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

Constructor Detail

DepotRMIClassLoaderSpi

public DepotRMIClassLoaderSpi()

Default constructor.

Method Detail

loadClass

public Class loadClass(String codebase,
                       String name,
                       ClassLoader defaultLoader)
                throws MalformedURLException,
                       ClassNotFoundException

Provides the implementation for RMIClassLoader.loadClass(URL,String), RMIClassLoader.loadClass(String,String), and RMIClassLoader.loadClass(String,String,ClassLoader). Loads a class from a codebase URL path, optionally using the supplied loader.

Parameters:

codebase - the list of URLs (separated by spaces) to load the class from, or null

name - the name of the class to load

defaultLoader - additional contextual class loader to use, or null

Returns:

the Class object representing the loaded class

Throws:

MalformedURLException - if codebase is non-null and contains an invalid URL, or if codebase is null and the system property java.rmi.server.codebase contains an invalid URL

ClassNotFoundException - if a definition for the class could not be found at the specified location

loadProxyClass

public Class loadProxyClass(String codebase,
                            String[] interfaces,
                            ClassLoader defaultLoader)
                     throws MalformedURLException,
                            ClassNotFoundException

Provides the implementation for RMIClassLoader.loadProxyClass(String,String[],ClassLoader). Loads a dynamic proxy class (see Proxy that implements a set of interfaces with the given names from a codebase URL path, optionally using the supplied loader.

An implementation of this method must either return a proxy class that implements the named interfaces or throw an exception.

Parameters:

codebase - the list of URLs (space-separated) to load classes from, or null

interfaces - the names of the interfaces for the proxy class to implement

defaultLoader - additional contextual class loader to use, or null

Returns:

a dynamic proxy class that implements the named interfaces

Throws:

MalformedURLException - if codebase is non-null and contains an invalid URL, or if codebase is null and the system property java.rmi.server.codebase contains an invalid URL

ClassNotFoundException - if a definition for one of the named interfaces could not be found at the specified location, or if creation of the dynamic proxy class failed (such as if Proxy.getProxyClass(ClassLoader,Class[]) would throw an IllegalArgumentException for the given interface list)

getClassLoader

public ClassLoader getClassLoader(String codebase)
                           throws MalformedURLException,
                                  SecurityException

Provides the implementation for RMIClassLoader.getClassLoader(String). Returns a class loader that loads classes from the given codebase URL path.

If there is a security manger, its checkPermission method will be invoked with a RuntimePermission("getClassLoader") permission; this could result in a SecurityException. The implementation of this method may also perform further security checks to verify that the calling context has permission to connect to all of the URLs in the codebase URL path.

Parameters:

codebase - the list of URLs (space-separated) from which the returned class loader will load classes from, or null

Returns:

a class loader that loads classes from the given codebase URL path

Throws:

MalformedURLException - if codebase is non-null and contains an invalid URL, or if codebase is null and the system property java.rmi.server.codebase contains an invalid URL

SecurityException - if there is a security manager and the invocation of its checkPermission method fails, or if the caller does not have permission to connect to all of the URLs in the codebase URL path

getClassAnnotation

public String getClassAnnotation(Class cl)
                          throws NullPointerException

Provides the implementation for RMIClassLoader.getClassAnnotation(Class). Returns the annotation string (representing a location for the class definition) that RMI will use to annotate the class descriptor when marshalling objects of the given class.

Parameters:

cl - the class to obtain the annotation for

Returns:

a string to be used to annotate the given class when it gets marshalled, or null

Throws:

NullPointerException - if cl is null