Package jadex.platform.service.library

Class DelegationURLClassLoader

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

jadex.platform.service.library.DelegationURLClassLoader

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class DelegationURLClassLoader
extends java.net.URLClassLoader

The delegation url classloader is responsible for managing a own resource plus a set of fixed delegate loaders.

Field Summary

Fields

Modifier and Type	Field	Description
protected java.lang.ClassLoader	basecl	The base class loader.
protected java.util.List<DelegationURLClassLoader>	delegates	The delegation classloader.
protected java.util.Set<DelegationURLClassLoader>	dependencies	The flattened transitive dependencies without duplicates (created lazy from delegates list).
protected java.util.List<DelegationURLClassLoader>	parents	The parent classloaders (i.e.
protected IResourceIdentifier	rid	The resource identifier.

Constructor Summary

Constructors

Constructor	Description
DelegationURLClassLoader(IResourceIdentifier rid, java.net.URL url, java.lang.ClassLoader basecl, DelegationURLClassLoader[] delegates)	Create a new classloader.
DelegationURLClassLoader(java.lang.ClassLoader basecl, DelegationURLClassLoader[] delegates)	Create a new classloader.

Method Summary

Modifier and Type	Method	Description
boolean	addDelegateClassLoader(DelegationURLClassLoader classloader)	Add a new delegate loader.
boolean	addParentClassLoader(DelegationURLClassLoader parent)	Add a parent loader.
static java.util.Set<DelegationURLClassLoader>	computeFlattenedDependencies(java.util.List<DelegationURLClassLoader> deps)	Get transitive dependencies as flattened set (without duplicates).
protected java.net.URL	findDirectResource(java.lang.String name)	Find the resource.
protected java.util.Enumeration<java.net.URL>	findDirectResources(java.lang.String name)	Find the resource.
java.net.URL	findResource(java.lang.String name)	Find the resource.
java.util.Enumeration<java.net.URL>	findResources(java.lang.String name)	Find the resource.
static void	getAllParentLoaders(java.lang.ClassLoader cl, java.util.Set<java.lang.ClassLoader> cls)
java.util.Set<IResourceIdentifier>	getAllResourceIdentifiers()	Get all managed resource identifiers inlcuding all subdependencies.
java.util.Set<java.net.URL>	getALLURLs()	Get transitive dependencies as flattened set (without duplicates).
protected java.lang.ClassLoader	getBaseClassLoader()
DelegationURLClassLoader[]	getDelegateClassLoaders()	Get the delegates.
java.util.List<IResourceIdentifier>	getDelegateResourceIdentifiers()	Get the delegates.
java.util.List<DelegationURLClassLoader>	getDelegates()	Get the delegates.
java.util.Set<DelegationURLClassLoader>	getFlattenedDependencies()	Get transitive dependencies as flattened set (without duplicates).
java.util.List<DelegationURLClassLoader>	getParentClassLoaders()	Get the parent class loaders.
IResourceIdentifier	getResourceIdentifier()	Get the resource identifier.
java.net.URL	getURL()	Get the own url.
boolean	hasParentClassLoader()	Test if has parent classloader.
boolean	isClassLoaderCompatible(java.lang.Class<?> clazz)
protected java.lang.Class<?>	loadClass(java.lang.String name, boolean resolve)	Load class.
protected java.lang.Class<?>	loadDirectClass(java.lang.String name, boolean resolve)	Load a class directly, without delegation to dependencies or base class loader
boolean	removeDelegateClassLoader(DelegationURLClassLoader classloader)	Remove a new delegate loader.
boolean	removeParentClassLoader(DelegationURLClassLoader parent)	Remove a parent classloader.
void	setResourceIdentifier(IResourceIdentifier rid)	Set the rid.
java.lang.String	toString()	Get a string representation.

Methods inherited from class java.net.URLClassLoader

addURL, close, definePackage, findClass, getPermissions, getResourceAsStream, 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, getResource, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, getUnnamedModule, isRegisteredAsParallelCapable, loadClass, registerAsParallelCapable, resolveClass, resources, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

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

Field Detail

rid

protected IResourceIdentifier rid

The resource identifier.

basecl

protected java.lang.ClassLoader basecl

The base class loader.

delegates

protected java.util.List<DelegationURLClassLoader> delegates

The delegation classloader.

parents

protected java.util.List<DelegationURLClassLoader> parents

The parent classloaders (i.e. the support).

dependencies

protected volatile java.util.Set<DelegationURLClassLoader> dependencies

The flattened transitive dependencies without duplicates (created lazy from delegates list).

Constructor Detail

DelegationURLClassLoader

public DelegationURLClassLoader(java.lang.ClassLoader basecl,
                                DelegationURLClassLoader[] delegates)

Create a new classloader.

DelegationURLClassLoader

public DelegationURLClassLoader(IResourceIdentifier rid,
                                java.net.URL url,
                                java.lang.ClassLoader basecl,
                                DelegationURLClassLoader[] delegates)

Create a new classloader.

Method Detail

getDelegateResourceIdentifiers

public java.util.List<IResourceIdentifier> getDelegateResourceIdentifiers()

Get the delegates.

Returns:

The delegates.

getDelegateClassLoaders

public DelegationURLClassLoader[] getDelegateClassLoaders()

Get the delegates.

Returns:

The delegates.

addDelegateClassLoader

public boolean addDelegateClassLoader(DelegationURLClassLoader classloader)

Add a new delegate loader.

Parameters:

classloader - The delegate classloader.

removeDelegateClassLoader

public boolean removeDelegateClassLoader(DelegationURLClassLoader classloader)

Remove a new delegate loader.

Parameters:

classloader - The delegate classloader.

Returns:

True, if classloader was removed.

addParentClassLoader

public boolean addParentClassLoader(DelegationURLClassLoader parent)

Add a parent loader.

Parameters:

classloader - The parent loader.

removeParentClassLoader

public boolean removeParentClassLoader(DelegationURLClassLoader parent)

Remove a parent classloader.

hasParentClassLoader

public boolean hasParentClassLoader()

Test if has parent classloader.

getParentClassLoaders

public java.util.List<DelegationURLClassLoader> getParentClassLoaders()

Get the parent class loaders.

getFlattenedDependencies

public java.util.Set<DelegationURLClassLoader> getFlattenedDependencies()

Get transitive dependencies as flattened set (without duplicates).

getALLURLs

public java.util.Set<java.net.URL> getALLURLs()

Get transitive dependencies as flattened set (without duplicates).

computeFlattenedDependencies

public static java.util.Set<DelegationURLClassLoader> computeFlattenedDependencies(java.util.List<DelegationURLClassLoader> deps)

Get transitive dependencies as flattened set (without duplicates).

getDelegates

public java.util.List<DelegationURLClassLoader> getDelegates()

Get the delegates.

getURL

public java.net.URL getURL()

Get the own url.

getResourceIdentifier

public IResourceIdentifier getResourceIdentifier()

Get the resource identifier.

Returns:

The resource identifier.

setResourceIdentifier

public void setResourceIdentifier(IResourceIdentifier rid)

Set the rid.

Parameters:

rid - The rid to set.

getAllResourceIdentifiers

public java.util.Set<IResourceIdentifier> getAllResourceIdentifiers()

Get all managed resource identifiers inlcuding all subdependencies.

Returns:

The resource identifiers.

loadDirectClass

protected java.lang.Class<?> loadDirectClass(java.lang.String name,
                                             boolean resolve)
                                      throws java.lang.ClassNotFoundException

Load a class directly, without delegation to dependencies or base class loader

Throws:

java.lang.ClassNotFoundException

loadClass

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

Load class. Overridden to delegate to dependencies, if not found.

Overrides:

loadClass in class java.lang.ClassLoader

Throws:

java.lang.ClassNotFoundException

findDirectResource

protected java.net.URL findDirectResource(java.lang.String name)

Find the resource.

Parameters:

name - The name.

Returns:

The url.

findResource

public java.net.URL findResource(java.lang.String name)

Find the resource.

Overrides:

findResource in class java.net.URLClassLoader

Parameters:

name - The name.

Returns:

The url.

getBaseClassLoader

protected java.lang.ClassLoader getBaseClassLoader()

findDirectResources

protected java.util.Enumeration<java.net.URL> findDirectResources(java.lang.String name)
                                                           throws java.io.IOException

Find the resource.

Parameters:

name - The name.

Returns:

The url.

Throws:

java.io.IOException

findResources

public java.util.Enumeration<java.net.URL> findResources(java.lang.String name)
                                                  throws java.io.IOException

Find the resource.

Overrides:

findResources in class java.net.URLClassLoader

Parameters:

name - The name.

Returns:

The url.

Throws:

java.io.IOException

isClassLoaderCompatible

public boolean isClassLoaderCompatible(java.lang.Class<?> clazz)

getAllParentLoaders

public static void getAllParentLoaders(java.lang.ClassLoader cl,
                                       java.util.Set<java.lang.ClassLoader> cls)

toString

public java.lang.String toString()

Get a string representation.

Overrides:

toString in class java.lang.Object