Package net.bytebuddy.dynamic
Class NexusAccessor
- java.lang.Object
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- net.bytebuddy.dynamic.NexusAccessor
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public class NexusAccessor extends java.lang.Object
The Nexus accessor is creating a VM-global singletonNexus
such that it can be seen by all class loaders of a virtual machine. Furthermore, it provides an API to access this global instance.
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Nested Class Summary
Nested Classes Modifier and Type Class Description protected static interface
NexusAccessor.Dispatcher
A dispatcher for registering type initializers in theNexus
.static class
NexusAccessor.InitializationAppender
An initialization appender that looks up a loaded type initializer from Byte Buddy'sNexus
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Constructor Summary
Constructors Constructor Description NexusAccessor()
Creates a new accessor for theNexus
without any active management of stale references within a nexus.NexusAccessor(java.lang.ref.ReferenceQueue<? super java.lang.ClassLoader> referenceQueue)
Creates a new accessor for aNexus
where any GC eligible are enqueued to the supplied reference queue.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description static void
clean(java.lang.ref.Reference<? extends java.lang.ClassLoader> reference)
Removes a stale entries that are registered in theNexus
.static boolean
isAlive()
Checks if thisNexusAccessor
is capable of registering loaded type initializers.void
register(java.lang.String name, java.lang.ClassLoader classLoader, int identification, LoadedTypeInitializer loadedTypeInitializer)
Registers a loaded type initializer in Byte Buddy'sNexus
which is injected into the system class loader.
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Constructor Detail
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NexusAccessor
public NexusAccessor()
Creates a new accessor for theNexus
without any active management of stale references within a nexus.
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NexusAccessor
public NexusAccessor(java.lang.ref.ReferenceQueue<? super java.lang.ClassLoader> referenceQueue)
Creates a new accessor for aNexus
where any GC eligible are enqueued to the supplied reference queue. Any such enqueued reference can be explicitly removed from the nexus via theclean(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 ornull
if no reference queue should be notified.
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Method Detail
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isAlive
public static boolean isAlive()
Checks if thisNexusAccessor
is capable of registering loaded type initializers.- Returns:
true
if this accessor is alive.
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clean
public static void clean(java.lang.ref.Reference<? extends java.lang.ClassLoader> reference)
Removes a stale entries that are registered in theNexus
. 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 theNexusAccessor
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register
public void register(java.lang.String name, java.lang.ClassLoader classLoader, int identification, LoadedTypeInitializer loadedTypeInitializer)
Registers a loaded type initializer in Byte Buddy'sNexus
which is injected into the system class loader.
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