net.bytebuddy.dynamic

Class Nexus

java.lang.Object

net.bytebuddy.dynamic.Nexus

public class Nexus
extends Object

This nexus is a global dispatcher for initializing classes with LoadedTypeInitializers. To do so, this class is to be loaded by the system class loader in an explicit manner. Any instrumented class is then injected a code block into its static type initializer that makes a call to this very same nexus which had the loaded type initializer registered before hand.

Important: The nexus must never be accessed directly but only by the NexusAccessor which makes sure that the nexus is loaded by the system class loader. Otherwise, a class might not be able to initialize itself if it is loaded by different class loader that does not have the system class loader in its hierarchy.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object other)
int	hashCode()
static void	initialize(Class<?> type, int identification) Initializes a loaded type.
static void	register(String name, ClassLoader classLoader, int identification, Object typeInitializer) Registers a new loaded type initializer.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

initialize

public static void initialize(Class<?> type,
                              int identification)
                       throws Exception

Initializes a loaded type. This method must only be invoked via the system class loader.

Parameters:

type - The loaded type to initialize.

identification - An identification for the initializer to run.

Throws:

Exception - If an exception occurs.

register

public static void register(String name,
                            ClassLoader classLoader,
                            int identification,
                            Object typeInitializer)

Registers a new loaded type initializer.

Important: This method must never be called directly but only by using a NexusAccessor.register(String, ClassLoader, int, net.bytebuddy.implementation.LoadedTypeInitializer) which enforces to access this class for the system class loader where a Java agent always registers its instances. This avoids a duplication of the class if this nexus is loaded by different class loaders. For this reason, the last parameter must not use a Byte Buddy specific type as those types can be loaded by different class loaders, too. Any access of the instance is done using Java reflection instead.

Parameters:

name - The name of the type for the loaded type initializer.

classLoader - The class loader of the type for the loaded type initializer.

identification - An identification for the initializer to run.

typeInitializer - The type initializer to register. The initializer must be an instance of LoadedTypeInitializer where it does however not matter which class loader loaded this latter type.

equals

public boolean equals(Object other)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object