org.apache.nifi.nar

Class NarClassLoaders

java.lang.Object

org.apache.nifi.nar.NarClassLoaders

public final class NarClassLoaders
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	NarClassLoaders.NarDetails

Field Summary

Fields

Modifier and Type	Field and Description
private static AtomicReference<Map<String,ClassLoader>>	extensionClassLoaders
static String	FRAMEWORK_NAR_ID
private static AtomicReference<ClassLoader>	frameworkClassLoader
private static AtomicBoolean	initialized
static String	JETTY_NAR_ID
private static org.slf4j.Logger	logger

Constructor Summary

Constructors

Modifier	Constructor and Description
private	NarClassLoaders()

Method Summary

Methods

Modifier and Type	Method and Description
private static ClassLoader	createNarClassLoader(File narDirectory, ClassLoader parentClassLoader) Creates a new NarClassLoader.
static ClassLoader	getExtensionClassLoader(File extensionWorkingDirectory)
static Set<ClassLoader>	getExtensionClassLoaders()
static ClassLoader	getFrameworkClassLoader()
private static NarClassLoaders.NarDetails	getNarDetails(File narDirectory) Loads the details for the specified NAR.
static void	load(NiFiProperties properties) Loads the extensions class loaders from the specified working directory.

Methods inherited from class java.lang.Object

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

Field Detail

FRAMEWORK_NAR_ID

public static final String FRAMEWORK_NAR_ID

See Also:

Constant Field Values

JETTY_NAR_ID

public static final String JETTY_NAR_ID

See Also:

Constant Field Values

logger

private static final org.slf4j.Logger logger

initialized

private static final AtomicBoolean initialized

extensionClassLoaders

private static final AtomicReference<Map<String,ClassLoader>> extensionClassLoaders

frameworkClassLoader

private static final AtomicReference<ClassLoader> frameworkClassLoader

Constructor Detail

NarClassLoaders

private NarClassLoaders()

Method Detail

load

public static void load(NiFiProperties properties)
                 throws IOException,
                        ClassNotFoundException

Loads the extensions class loaders from the specified working directory. Loading is only performed during the initial invocation of load. Subsequent attempts will be ignored.

Parameters:

properties - properties object to initialize with

Throws:

IOException - ioe

ClassNotFoundException - cfne

IllegalStateException - if the class loaders have already been created

createNarClassLoader

private static ClassLoader createNarClassLoader(File narDirectory,
                               ClassLoader parentClassLoader)
                                         throws IOException,
                                                ClassNotFoundException

Creates a new NarClassLoader. The parentClassLoader may be null.

Parameters:

narDirectory - root directory of nar

parentClassLoader - parent classloader of nar

Returns:

the nar classloader

Throws:

IOException - ioe

ClassNotFoundException - cfne

getNarDetails

private static NarClassLoaders.NarDetails getNarDetails(File narDirectory)
                                                 throws IOException

Loads the details for the specified NAR. The details will be extracted from the manifest file.

Parameters:

narDirectory - the nar directory

Returns:

details about the NAR

Throws:

IOException - ioe

getFrameworkClassLoader

public static ClassLoader getFrameworkClassLoader()

Returns:

the framework class loader

Throws:

IllegalStateException - if the frame class loader has not been loaded

getExtensionClassLoader

public static ClassLoader getExtensionClassLoader(File extensionWorkingDirectory)

Parameters:

extensionWorkingDirectory - the directory

Returns:

the class loader for the specified working directory. Returns null when no class loader exists for the specified working directory

Throws:

IllegalStateException - if the class loaders have not been loaded

getExtensionClassLoaders

public static Set<ClassLoader> getExtensionClassLoaders()

Returns:

the extension class loaders

Throws:

IllegalStateException - if the class loaders have not been loaded