ClassLoaderBase (Apache HBase 1.2.12 API)

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Summary:
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Constr |
Method

Detail:
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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`
`private ConcurrentHashMap<String,Object>`	`parallelLockMap`
`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

Methods
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
  - parallelLockMap
```
private final ConcurrentHashMap<String,Object> parallelLockMap
```
  - 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

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