Class RMIClassLoaderSpi

java.lang.Object

java.rmi.server.RMIClassLoaderSpi

public abstract class RMIClassLoaderSpi
extends Object

RMIClassLoaderSpi is the service provider interface for RMIClassLoader. In particular, an RMIClassLoaderSpi instance provides an implementation of the following static methods of RMIClassLoader:

• RMIClassLoader.loadClass(URL,String)
• RMIClassLoader.loadClass(String,String)
• RMIClassLoader.loadClass(String,String,ClassLoader)
• RMIClassLoader.loadProxyClass(String,String[],ClassLoader)
• RMIClassLoader.getClassLoader(String)
• RMIClassLoader.getClassAnnotation(Class)

When one of those methods is invoked, its behavior is to delegate to a corresponding method on an instance of this class. The details of how each method delegates to the provider instance is described in the documentation for each particular method. See the documentation for RMIClassLoader for a description of how a provider instance is chosen.

Since:

1.4

See Also:

• RMIClassLoader

Constructor Summary

Constructors

Constructor	Description
RMIClassLoaderSpi()	Constructor for subclasses to call.

Method Summary

Modifier and Type	Method	Description
abstract String	getClassAnnotation(Class<?> cl)	Provides the implementation for RMIClassLoader.getClassAnnotation(Class).
abstract ClassLoader	getClassLoader(String codebase)	Provides the implementation for RMIClassLoader.getClassLoader(String).
abstract 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).
abstract Class<?>	loadProxyClass(String codebase, String[] interfaces, ClassLoader defaultLoader)	Provides the implementation for RMIClassLoader.loadProxyClass(String,String[],ClassLoader).

Methods declared in class Object

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

Modifier and Type	Method	Description
protected Object	clone()	Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
boolean	equals(Object o)	Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
protected void	finalize()	Deprecated, for removal: This API element is subject to removal in a future version. May cause performance issues, deadlocks and hangs.
final Class<? extends Object>	getClass()	Answers the unique instance of java.lang.Class which represents the class of the receiver.
int	hashCode()	Answers an integer hash code for the receiver.
final void	notify()	Causes one thread which is waiting on the receiver to be made ready to run.
final void	notifyAll()	Causes all threads which are waiting on the receiver to be made ready to run.
String	toString()	Answers a string containing a concise, human-readable description of the receiver.
final void	wait()	Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
final void	wait(long time)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
final void	wait(long time, int frac)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

Constructor Details

RMIClassLoaderSpi

public RMIClassLoaderSpi()

Constructor for subclasses to call.

Method Details

loadClass

public abstract 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. Typically, a provider implementation will attempt to resolve the named class using the given defaultLoader, if specified, before attempting to resolve the class from the codebase URL path.

An implementation of this method must either return a class with the given name or throw an exception.

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 a provider-specific URL used to load classes is invalid

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

loadProxyClass

public abstract 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 a provider-specific URL used to load classes is invalid

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 abstract ClassLoader getClassLoader(String codebase)
                                    throws MalformedURLException

Provides the implementation for RMIClassLoader.getClassLoader(String). Returns a class loader that loads classes from the given 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 a provider-specific URL used to identify the class loader is invalid

getClassAnnotation

public abstract String getClassAnnotation(Class<?> cl)

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