Package 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	Description
static class	AccumuloVFSClassLoader.AccumuloVFSClassLoaderShutdownThread
static interface	AccumuloVFSClassLoader.Printer

Field Summary

Fields

Modifier and Type	Field	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	Description
AccumuloVFSClassLoader()

Method Summary

Modifier and Type	Method	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()