Package com.google.inject.internal.aop

Class UnsafeClassDefiner

java.lang.Object

com.google.inject.internal.aop.UnsafeClassDefiner

All Implemented Interfaces:

ClassDefiner

final class UnsafeClassDefiner
extends java.lang.Object
implements ClassDefiner

ClassDefiner that defines classes using sun.misc.Unsafe.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	UnsafeClassDefiner.ClassLoaderDefineClassHolder
private static class	UnsafeClassDefiner.DefineClassCacheHolder

Field Summary

Fields

Modifier and Type	Field	Description
private static boolean	ALWAYS_DEFINE_ANONYMOUSLY
private static java.lang.String	BYTE_ARRAY_TYPE
private static java.lang.String	CLASS_LOADER_TYPE
private static java.lang.String[]	DEFINEACCESS_API
private static java.lang.String	DEFINEACCESS_BY_GUICE_MARKER
private static java.util.logging.Logger	logger
private static ClassDefiner	UNSAFE_DEFINER

Constructor Summary

Constructors

Constructor	Description
UnsafeClassDefiner()

Method Summary

Modifier and Type	Method	Description
(package private) static ClassDefiner	accessDefineClass(java.lang.Class<?> loaderClass)	Generates helper in same package as the ClassLoader so it can access defineClass
private static byte[]	buildDefineClassAccess(java.lang.Class<?> loaderClass)	ClassLoader helper that sits in the same package and passes on defineClass requests
static boolean	canDowncastToProxy(java.lang.Class<?> hostClass)	Returns true if it's possible to downcast to proxies defined from the given host.
static boolean	canLoadProxyByName(java.lang.Class<?> hostClass)	Returns true if it's possible to load by name proxies defined from the given host.
java.lang.Class<?>	define(java.lang.Class<?> hostClass, byte[] bytecode)	Defines a new class relative to the host.
private static ClassDefiner	findClassDefiner(java.lang.ClassLoader hostLoader)	Finds the appropriate class definer for the given class loader.
static boolean	isAccessible()	Do we have access to sun.misc.Unsafe?
(package private) static ClassDefiner	tryAccessDefineClass(java.lang.Class<?> loaderClass)
(package private) static <T> T	tryPrivileged(java.security.PrivilegedExceptionAction<T> action, java.lang.String errorMessage)

Methods inherited from class java.lang.Object

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

Field Detail

logger

private static final java.util.logging.Logger logger

UNSAFE_DEFINER

private static final ClassDefiner UNSAFE_DEFINER

ALWAYS_DEFINE_ANONYMOUSLY

private static final boolean ALWAYS_DEFINE_ANONYMOUSLY

DEFINEACCESS_BY_GUICE_MARKER

private static final java.lang.String DEFINEACCESS_BY_GUICE_MARKER

See Also:

Constant Field Values

DEFINEACCESS_API

private static final java.lang.String[] DEFINEACCESS_API

CLASS_LOADER_TYPE

private static final java.lang.String CLASS_LOADER_TYPE

BYTE_ARRAY_TYPE

private static final java.lang.String BYTE_ARRAY_TYPE

Constructor Detail

UnsafeClassDefiner

UnsafeClassDefiner()

Method Detail

isAccessible

public static boolean isAccessible()

Do we have access to sun.misc.Unsafe?

canLoadProxyByName

public static boolean canLoadProxyByName(java.lang.Class<?> hostClass)

Returns true if it's possible to load by name proxies defined from the given host.

canDowncastToProxy

public static boolean canDowncastToProxy(java.lang.Class<?> hostClass)

Returns true if it's possible to downcast to proxies defined from the given host.

define

public java.lang.Class<?> define(java.lang.Class<?> hostClass,
                                 byte[] bytecode)
                          throws java.lang.Exception

Description copied from interface: ClassDefiner

Defines a new class relative to the host.

Specified by:

define in interface ClassDefiner

Throws:

java.lang.Exception

findClassDefiner

private static ClassDefiner findClassDefiner(java.lang.ClassLoader hostLoader)

Finds the appropriate class definer for the given class loader.

tryPrivileged

static <T> T tryPrivileged(java.security.PrivilegedExceptionAction<T> action,
                           java.lang.String errorMessage)

tryAccessDefineClass

static ClassDefiner tryAccessDefineClass(java.lang.Class<?> loaderClass)

accessDefineClass

static ClassDefiner accessDefineClass(java.lang.Class<?> loaderClass)
                               throws java.lang.Exception

Generates helper in same package as the ClassLoader so it can access defineClass

Throws:

java.lang.Exception

buildDefineClassAccess

private static byte[] buildDefineClassAccess(java.lang.Class<?> loaderClass)

ClassLoader helper that sits in the same package and passes on defineClass requests