Class NexusAccessor

java.lang.Object

net.bytebuddy.dynamic.NexusAccessor

@Enhance
public class NexusAccessor
extends Object

The Nexus accessor is creating a VM-global singleton Nexus such that it can be seen by all class loaders of a virtual machine. Furthermore, it provides an API to access this global instance.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static interface	NexusAccessor.Dispatcher	A dispatcher for registering type initializers in the Nexus.
static class	NexusAccessor.InitializationAppender	An initialization appender that looks up a loaded type initializer from Byte Buddy's Nexus.

Constructor Summary

Constructors

Constructor	Description
NexusAccessor()	Creates a new accessor for the Nexus without any active management of stale references within a nexus.
NexusAccessor(ReferenceQueue<? super ClassLoader> referenceQueue)	Creates a new accessor for a Nexus where any GC eligible are enqueued to the supplied reference queue.

Method Summary

Modifier and Type	Method	Description
static void	clean(Reference<? extends ClassLoader> reference)	Removes a stale entries that are registered in the Nexus.
static boolean	isAlive()	Checks if this NexusAccessor is capable of registering loaded type initializers.
void	register(String name, ClassLoader classLoader, int identification, LoadedTypeInitializer loadedTypeInitializer)	Registers a loaded type initializer in Byte Buddy's Nexus which is injected into the system class loader.

Methods inherited from class Object

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

Constructor Details

NexusAccessor

public NexusAccessor()

Creates a new accessor for the Nexus without any active management of stale references within a nexus.

NexusAccessor

public NexusAccessor(@MaybeNull
 ReferenceQueue<? super ClassLoader> referenceQueue)

Creates a new accessor for a Nexus where any GC eligible are enqueued to the supplied reference queue. Any such enqueued reference can be explicitly removed from the nexus via the clean(Reference) method. Nexus entries can become stale if a class loader is garbage collected after a class was loaded but before a class was initialized.

Parameters:

referenceQueue - The reference queue onto which stale references should be enqueued or null if no reference queue should be notified.

Method Details

isAlive

public static boolean isAlive()

Checks if this NexusAccessor is capable of registering loaded type initializers.

Returns:

true if this accessor is alive.

clean

public static void clean(Reference<? extends ClassLoader> reference)

Removes a stale entries that are registered in the Nexus. Entries can become stale if a class is loaded but never initialized prior to its garbage collection. As all class loaders within a nexus are only referenced weakly, such class loaders are always garbage collected. However, the initialization data stored by Byte Buddy does not become eligible which is why it needs to be cleaned explicitly.

Parameters:

reference - The reference to remove. References are collected via a reference queue that is supplied to the NexusAccessor.

register

public void register(String name,
 @MaybeNull
 ClassLoader classLoader,
 int identification,
 LoadedTypeInitializer loadedTypeInitializer)

Registers a loaded type initializer in Byte Buddy's Nexus which is injected into the system class loader.

Parameters:

name - The binary name of the class.

classLoader - The class's class loader.

identification - The id used for identifying the loaded type initializer that was added to the Nexus.

loadedTypeInitializer - The loaded type initializer to make available via the Nexus.