org.apache.accumulo.start.classloader.vfs

Class AccumuloVFSClassLoader

java.lang.Object

org.apache.accumulo.start.classloader.vfs.AccumuloVFSClassLoader

public class AccumuloVFSClassLoader
extends Object

This class builds a hierarchy of Classloaders in the form of:

 SystemClassLoader that loads JVM classes
       ^
       |
 AccumuloClassLoader loads jars from locations in general.classpaths. Usually the URLs for HADOOP_HOME, ZOOKEEPER_HOME, ACCUMULO_HOME and their associated directories
       ^
       |
 VFSClassLoader that loads jars from locations in general.vfs.classpaths.  Can be used to load accumulo jar from HDFS
       ^
       |
 AccumuloReloadingVFSClassLoader That loads jars from locations in general.dynamic.classpaths.  Used to load jar dynamically.

 

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	AccumuloVFSClassLoader.AccumuloVFSClassLoaderShutdownThread
static interface	AccumuloVFSClassLoader.Printer

Field Summary

Fields

Modifier and Type	Field and Description
static String	DEFAULT_DYNAMIC_CLASSPATH_VALUE
static String	DYNAMIC_CLASSPATH_PROPERTY_NAME
static String	VFS_CACHE_DIR
static String	VFS_CLASSLOADER_SYSTEM_CLASSPATH_PROPERTY
static String	VFS_CONTEXT_CLASSPATH_PROPERTY

Constructor Summary

Constructors

Constructor and Description
AccumuloVFSClassLoader()

Method Summary

Methods

Modifier and Type	Method and Description
static void	close()
static org.apache.commons.vfs2.FileSystemManager	generateVfs()
static ClassLoader	getClassLoader()
static ContextManager	getContextManager()
static Class<?>	loadClass(String classname)
static <U> Class<? extends U>	loadClass(String classname, Class<U> extension)
static void	printClassPath()
static void	printClassPath(AccumuloVFSClassLoader.Printer out)

Methods inherited from class java.lang.Object

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

Field Detail

DYNAMIC_CLASSPATH_PROPERTY_NAME

public static final String DYNAMIC_CLASSPATH_PROPERTY_NAME

See Also:

Constant Field Values

DEFAULT_DYNAMIC_CLASSPATH_VALUE

public static final String DEFAULT_DYNAMIC_CLASSPATH_VALUE

See Also:

Constant Field Values

VFS_CLASSLOADER_SYSTEM_CLASSPATH_PROPERTY

public static final String VFS_CLASSLOADER_SYSTEM_CLASSPATH_PROPERTY

See Also:

Constant Field Values

VFS_CONTEXT_CLASSPATH_PROPERTY

public static final String VFS_CONTEXT_CLASSPATH_PROPERTY

See Also:

Constant Field Values

VFS_CACHE_DIR

public static final String VFS_CACHE_DIR

See Also:

Constant Field Values

Constructor Detail

AccumuloVFSClassLoader

public AccumuloVFSClassLoader()

Method Detail

loadClass

public static <U> Class<? extends U> loadClass(String classname,
                               Class<U> extension)
                                    throws ClassNotFoundException

Throws:

ClassNotFoundException

loadClass

public static Class<?> loadClass(String classname)
                          throws ClassNotFoundException

Throws:

ClassNotFoundException

getClassLoader

public static ClassLoader getClassLoader()
                                  throws IOException

Throws:

IOException

generateVfs

public static org.apache.commons.vfs2.FileSystemManager generateVfs()
                                                             throws org.apache.commons.vfs2.FileSystemException

Throws:

org.apache.commons.vfs2.FileSystemException

printClassPath

public static void printClassPath()

printClassPath

public static void printClassPath(AccumuloVFSClassLoader.Printer out)

getContextManager

public static ContextManager getContextManager()
                                        throws IOException

Throws:

IOException

close

public static void close()