org.apache.hadoop.hbase.util

Class ClassLoaderBase

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

org.apache.hadoop.hbase.util.ClassLoaderBase

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

CoprocessorClassLoader, DynamicClassLoader

@InterfaceAudience.Private
public class ClassLoaderBase
extends URLClassLoader

Base class loader that defines couple shared constants used by sub-classes. It also defined method getClassLoadingLock for parallel class loading and JDK 1.6 support. This method (getClassLoadingLock) is similar to the same method in the base class Java ClassLoader introduced in JDK 1.7, but not in JDK 1.6.

Field Summary

Fields

Modifier and Type	Field and Description
protected static String	DEFAULT_LOCAL_DIR
protected static String	LOCAL_DIR_KEY
protected ClassLoader	parent Parent class loader.

Constructor Summary

Constructors

Constructor and Description
ClassLoaderBase(ClassLoader parent) Creates a DynamicClassLoader that can load classes dynamically from jar files under a specific folder.

Method Summary

Modifier and Type	Method and Description
protected Object	getClassLoadingLock(String className) Returns the lock object for class loading operations.

Methods inherited from class java.net.URLClassLoader

addURL, close, definePackage, findClass, findResource, findResources, 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, findLibrary, findLoadedClass, findSystemClass, getPackage, getPackages, getParent, getResource, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, loadClass, registerAsParallelCapable, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_LOCAL_DIR

protected static final String DEFAULT_LOCAL_DIR

See Also:

Constant Field Values

LOCAL_DIR_KEY

protected static final String LOCAL_DIR_KEY

See Also:

Constant Field Values

parent

protected final ClassLoader parent

Parent class loader.

Constructor Detail

ClassLoaderBase

public ClassLoaderBase(ClassLoader parent)

Creates a DynamicClassLoader that can load classes dynamically from jar files under a specific folder.

Parameters:

parent - the parent ClassLoader to set.

Method Detail

getClassLoadingLock

protected Object getClassLoadingLock(String className)

Returns the lock object for class loading operations.

Overrides:

getClassLoadingLock in class ClassLoader