com.vladium.emma.rt

Class InstrClassLoader

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

com.vladium.emma.rt.InstrClassLoader

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public final class InstrClassLoader
extends java.net.URLClassLoader

Author:

Vlad Roubtsov, (C) 2003

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	InstrClassLoader.PoolEntry

Field Summary

Fields

Modifier and Type	Field and Description
private static int	BAOS_INIT_SIZE
private static int	BAOS_MAX_SIZE
private static int	BAOS_POOL_SIZE
private static java.net.URL[]	EMPTY_URL_ARRAY
private InstrClassLoader.PoolEntry[]	m_bufPool
private java.util.Map	m_cache
private int	m_cacheHits
private int	m_cacheMisses
private IInclExclFilter	m_forcedDelegationFilter
private IClassLoadHook	m_hook
private Logger	m_log
private int	m_nestLevel
private java.lang.ClassLoader	m_parent
private IInclExclFilter	m_throughDelegationFilter
static java.lang.String	PROPERTY_FORCED_DELEGATION_FILTER
static java.lang.String	PROPERTY_THROUGH_DELEGATION_FILTER

Constructor Summary

Constructors

Constructor and Description
InstrClassLoader(java.lang.ClassLoader parent, java.io.File[] classpath, IInclExclFilter forcedDelegationFilter, IInclExclFilter throughDelegationFilter, IClassLoadHook hook, java.util.Map cache)

Method Summary

Methods

Modifier and Type	Method and Description
private InstrClassLoader.PoolEntry	acquirePoolEntry()
void	debugDump(java.io.PrintWriter out)
private java.lang.Class	defineClass(java.lang.String className, byte[] bytes, int length, java.net.URL srcURL)
private static java.net.URL[]	filesToURLs(java.io.File[] classpath)
protected java.lang.Class	findClass(java.lang.String name)
java.net.URL	getResource(java.lang.String name)
java.lang.Class	loadClass(java.lang.String name, boolean resolve) Overrides java.lang.ClassLoader.loadClass() to change the usual parent-child delegation rules just enough to be able to 'replace' the parent loader.
private static void	readFully(java.io.InputStream in, ByteArrayOStream out, byte[] buf) Reads the entire contents of a given stream into a flat byte array.
private void	releasePoolEntry(InstrClassLoader.PoolEntry buf)

Methods inherited from class java.net.URLClassLoader

addURL, close, definePackage, 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, getClassLoadingLock, getPackage, getPackages, getParent, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, 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

PROPERTY_FORCED_DELEGATION_FILTER

public static final java.lang.String PROPERTY_FORCED_DELEGATION_FILTER

See Also:

Constant Field Values

PROPERTY_THROUGH_DELEGATION_FILTER

public static final java.lang.String PROPERTY_THROUGH_DELEGATION_FILTER

See Also:

Constant Field Values

m_parent

private final java.lang.ClassLoader m_parent

m_forcedDelegationFilter

private final IInclExclFilter m_forcedDelegationFilter

m_throughDelegationFilter

private final IInclExclFilter m_throughDelegationFilter

m_cache

private final java.util.Map m_cache

m_hook

private final IClassLoadHook m_hook

m_bufPool

private final InstrClassLoader.PoolEntry[] m_bufPool

m_log

private final Logger m_log

m_nestLevel

private int m_nestLevel

m_cacheHits

private int m_cacheHits

m_cacheMisses

private int m_cacheMisses

BAOS_INIT_SIZE

private static final int BAOS_INIT_SIZE

See Also:

Constant Field Values

BAOS_MAX_SIZE

private static final int BAOS_MAX_SIZE

See Also:

Constant Field Values

BAOS_POOL_SIZE

private static final int BAOS_POOL_SIZE

See Also:

Constant Field Values

EMPTY_URL_ARRAY

private static final java.net.URL[] EMPTY_URL_ARRAY

Constructor Detail

InstrClassLoader

public InstrClassLoader(java.lang.ClassLoader parent,
                java.io.File[] classpath,
                IInclExclFilter forcedDelegationFilter,
                IInclExclFilter throughDelegationFilter,
                IClassLoadHook hook,
                java.util.Map cache)
                 throws java.net.MalformedURLException

Throws:

java.net.MalformedURLException

Method Detail

loadClass

public final java.lang.Class loadClass(java.lang.String name,
                        boolean resolve)
                                throws java.lang.ClassNotFoundException

Overrides java.lang.ClassLoader.loadClass() to change the usual parent-child delegation rules just enough to be able to 'replace' the parent loader. This also has the effect of detecting 'system' classes without doing any class name-based matching.

Overrides:

loadClass in class java.lang.ClassLoader

Throws:

java.lang.ClassNotFoundException

getResource

public final java.net.URL getResource(java.lang.String name)

Overrides:

getResource in class java.lang.ClassLoader

findClass

protected final java.lang.Class findClass(java.lang.String name)
                                   throws java.lang.ClassNotFoundException

Overrides:

findClass in class java.net.URLClassLoader

Throws:

java.lang.ClassNotFoundException

debugDump

public void debugDump(java.io.PrintWriter out)

defineClass

private java.lang.Class defineClass(java.lang.String className,
                          byte[] bytes,
                          int length,
                          java.net.URL srcURL)

filesToURLs

private static java.net.URL[] filesToURLs(java.io.File[] classpath)
                                   throws java.net.MalformedURLException

Throws:

java.net.MalformedURLException

readFully

private static void readFully(java.io.InputStream in,
             ByteArrayOStream out,
             byte[] buf)
                       throws java.io.IOException

Reads the entire contents of a given stream into a flat byte array.

Throws:

java.io.IOException

acquirePoolEntry

private InstrClassLoader.PoolEntry acquirePoolEntry()

releasePoolEntry

private void releasePoolEntry(InstrClassLoader.PoolEntry buf)