org.apache.nifi.nar

Class NarThreadContextClassLoader

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

org.apache.nifi.nar.NarThreadContextClassLoader

All Implemented Interfaces:

Closeable, AutoCloseable

public class NarThreadContextClassLoader
extends URLClassLoader

THREAD SAFE

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) static class	NarThreadContextClassLoader.ContextSecurityManager
private static class	NarThreadContextClassLoader.SingletonHolder

Field Summary

Fields

Modifier and Type	Field and Description
(package private) static NarThreadContextClassLoader.ContextSecurityManager	contextSecurityManager
private ClassLoader	forward
private static List<Class<?>>	narSpecificClasses

Constructor Summary

Constructors

Modifier	Constructor and Description
private	NarThreadContextClassLoader()

Method Summary

Modifier and Type	Method and Description
void	clearAssertionStatus()
private static ClassLoader	createClassLoader(String implementationClassName, String instanceId, Bundle bundle, ExtensionManager extensionManager)
static <T> T	createInstance(ExtensionManager extensionManager, String implementationClassName, Class<T> typeDefinition, NiFiProperties nifiProperties) Constructs an instance of the given type using either default no args constructor or a constructor which takes a NiFiProperties object (preferred).
static <T> T	createInstance(ExtensionManager extensionManager, String implementationClassName, Class<T> typeDefinition, NiFiProperties nifiProperties, String instanceId) Constructs an instance of the given type using either default no args constructor or a constructor which takes a NiFiProperties object (preferred).
private Class<?>	findNarClass(Class<?> cls)
static NarThreadContextClassLoader	getInstance()
URL	getResource(String name)
InputStream	getResourceAsStream(String name)
Enumeration<URL>	getResources(String name)
Class<?>	loadClass(String name)
private ClassLoader	lookupClassLoader()
void	setClassAssertionStatus(String className, boolean enabled)
void	setDefaultAssertionStatus(boolean enabled)
void	setPackageAssertionStatus(String packageName, boolean enabled)

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

defineClass, defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findSystemClass, getClassLoadingLock, getPackage, getPackages, getParent, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, registerAsParallelCapable, resolveClass, setSigners

Methods inherited from class java.lang.Object

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

Field Detail

contextSecurityManager

static final NarThreadContextClassLoader.ContextSecurityManager contextSecurityManager

forward

private final ClassLoader forward

narSpecificClasses

private static final List<Class<?>> narSpecificClasses

Constructor Detail

NarThreadContextClassLoader

private NarThreadContextClassLoader()

Method Detail

clearAssertionStatus

public void clearAssertionStatus()

Overrides:

clearAssertionStatus in class ClassLoader

getResource

public URL getResource(String name)

Overrides:

getResource in class ClassLoader

getResourceAsStream

public InputStream getResourceAsStream(String name)

Overrides:

getResourceAsStream in class URLClassLoader

getResources

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

Overrides:

getResources in class ClassLoader

Throws:

IOException

loadClass

public Class<?> loadClass(String name)
                   throws ClassNotFoundException

Overrides:

loadClass in class ClassLoader

Throws:

ClassNotFoundException

setClassAssertionStatus

public void setClassAssertionStatus(String className,
                                    boolean enabled)

Overrides:

setClassAssertionStatus in class ClassLoader

setDefaultAssertionStatus

public void setDefaultAssertionStatus(boolean enabled)

Overrides:

setDefaultAssertionStatus in class ClassLoader

setPackageAssertionStatus

public void setPackageAssertionStatus(String packageName,
                                      boolean enabled)

Overrides:

setPackageAssertionStatus in class ClassLoader

lookupClassLoader

private ClassLoader lookupClassLoader()

findNarClass

private Class<?> findNarClass(Class<?> cls)

getInstance

public static NarThreadContextClassLoader getInstance()

createInstance

public static <T> T createInstance(ExtensionManager extensionManager,
                                   String implementationClassName,
                                   Class<T> typeDefinition,
                                   NiFiProperties nifiProperties)
                            throws InstantiationException,
                                   IllegalAccessException,
                                   ClassNotFoundException

Constructs an instance of the given type using either default no args constructor or a constructor which takes a NiFiProperties object (preferred).

Type Parameters:

T - the type to create an instance for

Parameters:

implementationClassName - the implementation class name

typeDefinition - the type definition

nifiProperties - the NiFiProperties instance

Returns:

constructed instance

Throws:

InstantiationException - if there is an error instantiating the class

IllegalAccessException - if there is an error accessing the type

ClassNotFoundException - if the class cannot be found

createInstance

public static <T> T createInstance(ExtensionManager extensionManager,
                                   String implementationClassName,
                                   Class<T> typeDefinition,
                                   NiFiProperties nifiProperties,
                                   String instanceId)
                            throws InstantiationException,
                                   IllegalAccessException,
                                   ClassNotFoundException

Constructs an instance of the given type using either default no args constructor or a constructor which takes a NiFiProperties object (preferred).

Type Parameters:

T - the type to create an instance for

Parameters:

implementationClassName - the implementation class name

typeDefinition - the type definition

nifiProperties - the NiFiProperties instance

instanceId - the UUID of the instance

Returns:

constructed instance

Throws:

InstantiationException - if there is an error instantiating the class

IllegalAccessException - if there is an error accessing the type

ClassNotFoundException - if the class cannot be found

createClassLoader

private static ClassLoader createClassLoader(String implementationClassName,
                                             String instanceId,
                                             Bundle bundle,
                                             ExtensionManager extensionManager)
                                      throws ClassNotFoundException

Throws:

ClassNotFoundException