Package net.bytebuddy.dynamic.loading
Class ClassLoadingStrategy.UsingLookup
- java.lang.Object
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- net.bytebuddy.dynamic.loading.ClassLoadingStrategy.UsingLookup
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- All Implemented Interfaces:
ClassLoadingStrategy<java.lang.ClassLoader>
- Enclosing interface:
- ClassLoadingStrategy<T extends java.lang.ClassLoader>
@Enhance public static class ClassLoadingStrategy.UsingLookup extends java.lang.Object implements ClassLoadingStrategy<java.lang.ClassLoader>
A class loading strategy that uses ajava.lang.invoke.MethodHandles$Lookup
instance for defining types. A lookup instance can define types only in the same class loader and in the same package as the type within which it was created. The supplied lookup must have package privileges, i.e. it must not be a public lookup.
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Nested Class Summary
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Nested classes/interfaces inherited from interface net.bytebuddy.dynamic.loading.ClassLoadingStrategy
ClassLoadingStrategy.Configurable<S extends java.lang.ClassLoader>, ClassLoadingStrategy.Default, ClassLoadingStrategy.ForBootstrapInjection, ClassLoadingStrategy.ForUnsafeInjection, ClassLoadingStrategy.UsingLookup
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Field Summary
Fields Modifier and Type Field Description private ClassInjector
classInjector
The class injector to use.-
Fields inherited from interface net.bytebuddy.dynamic.loading.ClassLoadingStrategy
BOOTSTRAP_LOADER, NO_PROTECTION_DOMAIN
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Constructor Summary
Constructors Modifier Constructor Description protected
UsingLookup(ClassInjector classInjector)
Creates a new class loading strategy that uses a lookup type.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description java.util.Map<TypeDescription,java.lang.Class<?>>
load(java.lang.ClassLoader classLoader, java.util.Map<TypeDescription,byte[]> types)
Loads a given collection of classes given their binary representation.static ClassLoadingStrategy<java.lang.ClassLoader>
of(java.lang.Object lookup)
Creates a new class loading strategy that uses ajava.lang.invoke.MethodHandles$Lookup
instance.static ClassLoadingStrategy<java.lang.ClassLoader>
withFallback(java.util.concurrent.Callable<?> lookup)
Resolves a class loading strategy using a lookup if available on the current JVM.
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Field Detail
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classInjector
private final ClassInjector classInjector
The class injector to use.
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Constructor Detail
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UsingLookup
protected UsingLookup(ClassInjector classInjector)
Creates a new class loading strategy that uses a lookup type.- Parameters:
classInjector
- The class injector to use.
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Method Detail
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of
public static ClassLoadingStrategy<java.lang.ClassLoader> of(java.lang.Object lookup)
Creates a new class loading strategy that uses ajava.lang.invoke.MethodHandles$Lookup
instance.- Parameters:
lookup
- The lookup instance to use for defining new types.- Returns:
- A suitable class loading strategy.
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withFallback
public static ClassLoadingStrategy<java.lang.ClassLoader> withFallback(java.util.concurrent.Callable<?> lookup)
Resolves a class loading strategy using a lookup if available on the current JVM. If the current JVM supports method handles lookups, a lookup instance will be used. Alternatively, unsafe class definition is used, if supported. If neither strategy is supported, an exception is thrown. A common use case would be calling this method as inClassLoadingStrategy.UsingLookup.withFallback(MethodHandles::lookup)
. Note that the invocation ofMethodHandles.lookup()
is call site sensitive such that it cannot be invoked within Byte Buddy what requires this external invocation.- Parameters:
lookup
- A resolver for a lookup instance if the current JVM allows for lookup-based class injection.- Returns:
- An appropriate class loading strategy for the current JVM that uses a method handles lookup if available.
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load
public java.util.Map<TypeDescription,java.lang.Class<?>> load(java.lang.ClassLoader classLoader, java.util.Map<TypeDescription,byte[]> types)
Loads a given collection of classes given their binary representation.- Specified by:
load
in interfaceClassLoadingStrategy<java.lang.ClassLoader>
- Parameters:
classLoader
- The class loader to used for loading the classes.types
- Byte array representations of the types to be loaded mapped by their descriptions, where an iteration order defines an order in which they are supposed to be loaded, if relevant.- Returns:
- A collection of the loaded classes which will be initialized in the iteration order of the returned collection.
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