Class Advice
- All Implemented Interfaces:
AsmVisitorWrapper.ForDeclaredMethods.MethodVisitorWrapper
,InstrumentedType.Prepareable
,Implementation
Advice wrappers copy the code of blueprint methods to be executed before and/or after a matched method. To achieve this, a static
method of a class is annotated by Advice.OnMethodEnter
and/or Advice.OnMethodExit
and provided to an instance of this class.
A method that is annotated with Advice.OnMethodEnter
can annotate its parameters with Advice.Argument
where field access to this parameter
is substituted with access to the specified argument of the instrumented method. Alternatively, a parameter can be annotated by Advice.This
where the this
reference of the instrumented method is read when the parameter is accessed. This mechanism can also be used to assign a
new value to the this
reference of an instrumented method. If no annotation is used on a parameter, it is assigned the n
-th
parameter of the instrumented method for the n
-th parameter of the advice method. All parameters must declare the exact same type as
the parameters of the instrumented type or the method's declaring type for the Advice.This
reference respectively if they are not marked as
read-only. In the latter case, it suffices that a parameter type is a super type of the corresponding type of the instrumented method.
A method that is annotated with Advice.OnMethodExit
can equally annotate its parameters with Advice.Argument
and Advice.This
. Additionally,
it can annotate a parameter with Advice.Return
to receive the original method's return value. By reassigning the return value, it is possible
to replace the returned value. If an instrumented method does not return a value, this annotation must not be used. If a method returns
exceptionally, the parameter is set to its default value, i.e. to 0
for primitive types and to null
for reference types. The
parameter's type must be equal to the instrumented method's return type if it is not set to read-only where it suffices to declare the
parameter type to be of any super type to the instrumented method's return type. An exception can be read by annotating a parameter of type
Throwable
annotated with Advice.Thrown
which is assigned the thrown Throwable
or null
if a method returns normally.
Doing so, it is possible to exchange a thrown exception with any checked or unchecked exception.Finally, if a method annotated with
Advice.OnMethodEnter
exists and this method returns a value, this value can be accessed by a parameter annotated with Advice.Enter
.
This parameter must declare the same type as type being returned by the method annotated with Advice.OnMethodEnter
. If the parameter is marked
to be read-only, it suffices that the annotated parameter is of a super type of the return type of the method annotated by
Advice.OnMethodEnter
. If no such method exists or this method returns void
, no such parameter must be declared. Any return value
of a method that is annotated by Advice.OnMethodExit
is discarded.
If any advice method throws an exception, the method is terminated prematurely. If the method annotated by Advice.OnMethodEnter
throws an exception,
the method annotated by Advice.OnMethodExit
method is not invoked. If the instrumented method throws an exception, the method that is annotated by
Advice.OnMethodExit
is only invoked if the Advice.OnMethodExit.onThrowable()
property is set to true
what is the default. If this property
is set to false
, the Advice.Thrown
annotation must not be used on any parameter.
Byte Buddy does not assert the visibility of any types that are referenced within an inlined advice method. It is the responsibility of
the user of this class to assure that all types referenced within the advice methods are visible to the instrumented class. Failing to
do so results in a IllegalAccessError
at the instrumented class's runtime.
Advice can be used either as a AsmVisitorWrapper
where any declared methods of the currently instrumented type are enhanced without
replacing an existing implementation. Alternatively, advice can function as an Implementation
where, by default, the original super
or default method of the instrumented method is invoked. If this is not possible or undesired, the delegate implementation can be changed
by specifying a wrapped implementation explicitly by wrap(Implementation)
.
When using an advice class as a visitor wrapper, native or abstract methods which are silently skipped when advice matches such a method.
Important: Since Java 6, class files contain stack map frames embedded into a method's byte code. When advice methods are compiled
with a class file version less then Java 6 but are used for a class file that was compiled to Java 6 or newer, these stack map frames must be
computed by ASM by using the ClassWriter.COMPUTE_FRAMES
option. If the advice methods do not contain any branching instructions, this is
not required. No action is required if the advice methods are at least compiled with Java 6 but are used on classes older than Java 6. This
limitation only applies to advice methods that are inlined. Also, it is the responsibility of this class's user to assure that the advice method
does not contain byte code constructs that are not supported by the class containing the instrumented method. In particular, pre Java-5
try-finally blocks cannot be inlined into classes with newer byte code levels as the jsr instruction was deprecated. Also, classes prior
to Java 7 do not support the invokedynamic command which must not be contained by an advice method if the instrumented method targets an
older class file format version.
Note: For the purpose of inlining, Java 5 and Java 6 byte code can be seen as the best candidate for advice methods. These versions do
no longer allow subroutines, neither do they already allow invokedynamic instructions or method handles. This way, Java 5 and Java 6 byte
code is compatible to both older and newer versions. One exception for backwards-incompatible byte code is the possibility to load type references
from the constant pool onto the operand stack. These instructions can however easily be transformed for classes compiled to Java 4 and older
by registering a TypeConstantAdjustment
before the advice visitor.
Note: It is not possible to trigger break points in inlined advice methods as the debugging information of the inlined advice is not preserved. It is not possible in Java to reference more than one source file per class what makes translating such debugging information impossible. It is however possible to set break points in advice methods when invoking the original advice target. This allows debugging of advice code within unit tests that invoke the advice method without instrumentation. As a consequence of not transferring debugging information, the names of the parameters of an advice method do not matter when inlining, neither does any meta information on the advice method's body such as annotations or parameter modifiers.
Note: The behavior of this component is undefined if it is supplied with invalid byte code what might result in runtime exceptions.
Note: When using advice from a Java agent with an AgentBuilder
, it often makes sense to not include
any library-specific code in the agent's jar file. For being able to locate the advice code in the context of the library dependencies, Byte
Buddy offers an AgentBuilder.Transformer.ForAdvice
implementation that allows registering the agent's
class file locators for assembly of the advice class's description at runtime and with respect to the specific user dependencies.
- See Also:
-
Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionprotected static class
A method visitor that weaves the advice methods' byte codes.static @interface
Assigns an array containing all arguments of the instrumented method to the annotated parameter.protected static class
A byte code appender for implementingAdvice
.static @interface
Indicates that the annotated parameter should be mapped to the parameter with indexAdvice.Argument.value()
of the instrumented method.static interface
An argument handler is responsible for resolving offsets of the local variable array in the context of the applied instrumentation.static class
A post processor that uses the return value of an advice method to define values for fields, arguments, the instrumented method's return value or the exception being thrown.static interface
A resolver for the arguments that are provided to a bootstrap method if dynamic dispatch is used.protected static interface
Materializes an advice invocation within a delegation.protected static interface
A dispatcher for implementing advice.static @interface
Indicates that the annotated parameter should resolve a dynamic constant, using either constantdynamic or invokedynamic which is then bound to the parameter as a value.static @interface
Indicates that the annotated parameter should be mapped to the value that is returned by the advice method that is annotated byAdvice.OnMethodEnter
.static interface
An exception handler is responsible for providing byte code for handling an exception thrown from a suppressing advice method.static @interface
Indicates that the annotated parameter should be mapped to the value that is returned by the advice method that is annotated byAdvice.OnMethodExit
.static @interface
Indicates that the annotated parameter should be mapped to ajava.lang.invoke.MethodHandle
representing a field getter.static @interface
Indicates that the annotated parameter should be mapped to ajava.lang.invoke.MethodHandle
representing a field setter.static @interface
Indicates that the annotated parameter should be mapped to a field in the scope of the instrumented type.static @interface
Indicates that the annotated parameter should load ajava.lang.invoke.MethodHandle
that represents a method invocation, constructor invocation or field access.static @interface
Declares the annotated parameter as a local variable that is created by Byte Buddy for the instrumented method.protected static interface
A handler for computing the instrumented method's size.private static class
A marker class that indicates that an advice method does not suppress anyThrowable
.static interface
Represents an offset mapping for an advice method to an alternative offset.static final class
A marker type to be used as an argument forAdvice.OnMethodEnter.skipOn()
.static @interface
Indicates that this method should be inlined before the matched method is invoked.static @interface
Indicates that this method should be executed before exiting the instrumented method.static final class
A marker type to be used as an argument forAdvice.OnMethodEnter.skipOn()
.static @interface
Indicates that the annotated parameter should be mapped to a string representation of the instrumented method, a constant representing theClass
declaring the adviced method or aMethod
,Constructor
orjava.lang.reflect.Executable
representing this method.static interface
A post processor for advice methods that is invoked after advice is executed.static @interface
Indicates that the annotated parameter should be mapped to the return value of the instrumented method.static @interface
Indicates that the annotated parameter should load ajava.lang.invoke.MethodHandle
that represents an invocation of the current method.static interface
A handler for computing and translating stack map frames.static @interface
Indicates that the annotated parameter should always return a boxed version of the instrumented method's return value (i.e.static @interface
Indicates that the annotated parameter should be mapped to thethis
reference of the instrumented method.static @interface
Indicates that the annotated parameter should be mapped to theThrowable
thrown by the instrumented method or tonull
if the method returned regularly.static @interface
Indicates that the annotated parameter should always return a default value (i.e.static class
A builder step for creating anAdvice
that uses custom mappings of annotations to constant pool values.Nested classes/interfaces inherited from interface net.bytebuddy.implementation.Implementation
Implementation.Composable, Implementation.Compound, Implementation.Context, Implementation.Simple, Implementation.SpecialMethodInvocation, Implementation.Target
Nested classes/interfaces inherited from interface net.bytebuddy.dynamic.scaffold.InstrumentedType.Prepareable
InstrumentedType.Prepareable.NoOp
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate final Assigner
The assigner to use.private static final MethodDescription.InDefinedShape
A reference to theAdvice.OnMethodExit.backupArguments()
method.private final Implementation
The delegate implementation to apply if this advice is used as an instrumentation.private final Advice.ExceptionHandler
The exception handler to apply.private static final MethodDescription.InDefinedShape
A reference to theAdvice.OnMethodEnter.inline()
method.private static final MethodDescription.InDefinedShape
A reference to theAdvice.OnMethodExit.inline()
method.private final Advice.Dispatcher.Resolved.ForMethodEnter
The dispatcher for instrumenting the instrumented method upon entering.private final Advice.Dispatcher.Resolved.ForMethodExit
The dispatcher for instrumenting the instrumented method upon exiting.private static final MethodDescription.InDefinedShape
A reference to theAdvice.OnMethodExit.onThrowable()
method.private static final MethodDescription.InDefinedShape
A reference to theAdvice.OnMethodEnter.prependLineNumber()
method.private static final MethodDescription.InDefinedShape
A reference to theAdvice.OnMethodExit.repeatOn()
method.private static final MethodDescription.InDefinedShape
A reference to theAdvice.OnMethodExit.repeatOnIndex()
method.private static final MethodDescription.InDefinedShape
A reference to theAdvice.OnMethodEnter.skipOn()
method.private static final MethodDescription.InDefinedShape
A reference to theAdvice.OnMethodEnter.skipOnIndex()
method.private static final MethodDescription.InDefinedShape
A reference to theAdvice.OnMethodEnter.suppress()
method.private static final MethodDescription.InDefinedShape
A reference to theAdvice.OnMethodExit.suppress()
method.private static final AsmClassReader
Indicates that no class reader is available to an advice method. -
Constructor Summary
ConstructorsModifierConstructorDescriptionprotected
Advice
(Advice.Dispatcher.Resolved.ForMethodEnter methodEnter, Advice.Dispatcher.Resolved.ForMethodExit methodExit) Creates a new advice.private
Advice
(Advice.Dispatcher.Resolved.ForMethodEnter methodEnter, Advice.Dispatcher.Resolved.ForMethodExit methodExit, Assigner assigner, Advice.ExceptionHandler exceptionHandler, Implementation delegate) Creates a new advice. -
Method Summary
Modifier and TypeMethodDescriptionappender
(Implementation.Target implementationTarget) Creates a byte code appender that determines the implementation of the instrumented type's methods.protected org.objectweb.asm.MethodVisitor
doWrap
(TypeDescription instrumentedType, MethodDescription instrumentedMethod, org.objectweb.asm.MethodVisitor methodVisitor, Implementation.Context implementationContext, int writerFlags, int readerFlags) Wraps the method visitor to implement this advice.private static Advice.Dispatcher.Unresolved
locate
(Class<? extends Annotation> type, MethodDescription.InDefinedShape property, Advice.Dispatcher.Unresolved dispatcher, MethodDescription.InDefinedShape methodDescription, Advice.Delegator.Factory delegatorFactory) Locates a dispatcher for the method if available.on
(ElementMatcher<? super MethodDescription> matcher) Returns an ASM visitor wrapper that matches the given matcher and applies this advice to the matched methods.prepare
(InstrumentedType instrumentedType) Prepares a given instrumented type.static Advice
Implements advice where every matched method is advised by the given type's advisory methods.static Advice
Implements advice where every matched method is advised by the given type's advisory methods.static Advice
to
(Class<?> enterAdvice, Class<?> exitAdvice, ClassFileLocator classFileLocator) Implements advice where every matched method is advised by the given type's advisory methods.static Advice
to
(Class<?> advice, ClassFileLocator classFileLocator) Implements advice where every matched method is advised by the given type's advisory methods.static Advice
to
(TypeDescription advice) Implements advice where every matched method is advised by the given type's advisory methods.protected static Advice
to
(TypeDescription advice, Advice.PostProcessor.Factory postProcessorFactory, ClassFileLocator classFileLocator, List<? extends Advice.OffsetMapping.Factory<?>> userFactories, Advice.Delegator.Factory delegatorFactory, AsmClassReader.Factory classReaderFactory) Creates a new advice.static Advice
to
(TypeDescription enterAdvice, TypeDescription exitAdvice) Implements advice where every matched method is advised by the given type's advisory methods.protected static Advice
to
(TypeDescription enterAdvice, TypeDescription exitAdvice, Advice.PostProcessor.Factory postProcessorFactory, ClassFileLocator classFileLocator, List<? extends Advice.OffsetMapping.Factory<?>> userFactories, Advice.Delegator.Factory delegatorFactory, AsmClassReader.Factory classReaderFactory) Creates a new advice.static Advice
to
(TypeDescription enterAdvice, TypeDescription exitAdvice, ClassFileLocator classFileLocator) Implements advice where every matched method is advised by the given type's advisory methods.static Advice
to
(TypeDescription advice, ClassFileLocator classFileLocator) Implements advice where every matched method is advised by the given type's advisory methods.withAssigner
(Assigner assigner) Configures this advice to use the specified assigner.static Advice.WithCustomMapping
Allows for the configuration of custom annotations that are then bound to a dynamically computed, constant value.withExceptionHandler
(Advice.ExceptionHandler exceptionHandler) Configures this advice to execute the given exception handler upon a suppressed exception.withExceptionHandler
(StackManipulation exceptionHandler) Configures this advice to execute the given stack manipulation upon a suppressed exception.Configures this advice to callThrowable.printStackTrace()
upon a suppressed exception.org.objectweb.asm.MethodVisitor
wrap
(TypeDescription instrumentedType, MethodDescription instrumentedMethod, org.objectweb.asm.MethodVisitor methodVisitor, Implementation.Context implementationContext, TypePool typePool, int writerFlags, int readerFlags) Wraps a method visitor.wrap
(Implementation implementation) Wraps the supplied implementation to have this advice applied around it.
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Field Details
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UNDEFINED
Indicates that no class reader is available to an advice method. -
SKIP_ON
A reference to theAdvice.OnMethodEnter.skipOn()
method. -
SKIP_ON_INDEX
A reference to theAdvice.OnMethodEnter.skipOnIndex()
method. -
PREPEND_LINE_NUMBER
A reference to theAdvice.OnMethodEnter.prependLineNumber()
method. -
INLINE_ENTER
A reference to theAdvice.OnMethodEnter.inline()
method. -
SUPPRESS_ENTER
A reference to theAdvice.OnMethodEnter.suppress()
method. -
REPEAT_ON
A reference to theAdvice.OnMethodExit.repeatOn()
method. -
REPEAT_ON_INDEX
A reference to theAdvice.OnMethodExit.repeatOnIndex()
method. -
ON_THROWABLE
A reference to theAdvice.OnMethodExit.onThrowable()
method. -
BACKUP_ARGUMENTS
A reference to theAdvice.OnMethodExit.backupArguments()
method. -
INLINE_EXIT
A reference to theAdvice.OnMethodExit.inline()
method. -
SUPPRESS_EXIT
A reference to theAdvice.OnMethodExit.suppress()
method. -
methodEnter
The dispatcher for instrumenting the instrumented method upon entering. -
methodExit
The dispatcher for instrumenting the instrumented method upon exiting. -
assigner
The assigner to use. -
exceptionHandler
The exception handler to apply. -
delegate
The delegate implementation to apply if this advice is used as an instrumentation.
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Constructor Details
-
Advice
protected Advice(Advice.Dispatcher.Resolved.ForMethodEnter methodEnter, Advice.Dispatcher.Resolved.ForMethodExit methodExit) Creates a new advice.- Parameters:
methodEnter
- The dispatcher for instrumenting the instrumented method upon entering.methodExit
- The dispatcher for instrumenting the instrumented method upon exiting.
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Advice
private Advice(Advice.Dispatcher.Resolved.ForMethodEnter methodEnter, Advice.Dispatcher.Resolved.ForMethodExit methodExit, Assigner assigner, Advice.ExceptionHandler exceptionHandler, Implementation delegate) Creates a new advice.- Parameters:
methodEnter
- The dispatcher for instrumenting the instrumented method upon entering.methodExit
- The dispatcher for instrumenting the instrumented method upon exiting.assigner
- The assigner to use.exceptionHandler
- The exception handler to apply.delegate
- The delegate implementation to apply if this advice is used as an instrumentation.
-
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Method Details
-
to
Implements advice where every matched method is advised by the given type's advisory methods. The advices binary representation is accessed by querying the class loader of the supplied class for a class file.- Parameters:
advice
- The type declaring the advice.- Returns:
- A method visitor wrapper representing the supplied advice.
-
to
Implements advice where every matched method is advised by the given type's advisory methods.- Parameters:
advice
- The type declaring the advice.classFileLocator
- The class file locator for locating the advisory class's class file.- Returns:
- A method visitor wrapper representing the supplied advice.
-
to
Implements advice where every matched method is advised by the given type's advisory methods. Using this method, a non-operational class file locator is specified for the advice target. This implies that only advice targets with the inline target set tofalse
are resolvable by the returned instance.- Parameters:
advice
- The type declaring the advice.- Returns:
- A method visitor wrapper representing the supplied advice.
-
to
Implements advice where every matched method is advised by the given type's advisory methods.- Parameters:
advice
- A description of the type declaring the advice.classFileLocator
- The class file locator for locating the advisory class's class file.- Returns:
- A method visitor wrapper representing the supplied advice.
-
to
protected static Advice to(TypeDescription advice, Advice.PostProcessor.Factory postProcessorFactory, ClassFileLocator classFileLocator, List<? extends Advice.OffsetMapping.Factory<?>> userFactories, Advice.Delegator.Factory delegatorFactory, AsmClassReader.Factory classReaderFactory) Creates a new advice.- Parameters:
advice
- A description of the type declaring the advice.postProcessorFactory
- The post processor factory to use.classFileLocator
- The class file locator for locating the advisory class's class file.userFactories
- A list of custom factories for user generated offset mappings.delegatorFactory
- The delegator factory to use.classReaderFactory
- The class reader factory to use.- Returns:
- A method visitor wrapper representing the supplied advice.
-
to
Implements advice where every matched method is advised by the given type's advisory methods. The advices binary representation is accessed by querying the class loader of the supplied class for a class file.- Parameters:
enterAdvice
- The type declaring the enter advice.exitAdvice
- The type declaring the exit advice.- Returns:
- A method visitor wrapper representing the supplied advice.
-
to
public static Advice to(Class<?> enterAdvice, Class<?> exitAdvice, ClassFileLocator classFileLocator) Implements advice where every matched method is advised by the given type's advisory methods.- Parameters:
enterAdvice
- The type declaring the enter advice.exitAdvice
- The type declaring the exit advice.classFileLocator
- The class file locator for locating the advisory class's class file.- Returns:
- A method visitor wrapper representing the supplied advice.
-
to
Implements advice where every matched method is advised by the given type's advisory methods. Using this method, a non-operational class file locator is specified for the advice target. This implies that only advice targets with the inline target set tofalse
are resolvable by the returned instance.- Parameters:
enterAdvice
- The type declaring the enter advice.exitAdvice
- The type declaring the exit advice.- Returns:
- A method visitor wrapper representing the supplied advice.
-
to
public static Advice to(TypeDescription enterAdvice, TypeDescription exitAdvice, ClassFileLocator classFileLocator) Implements advice where every matched method is advised by the given type's advisory methods.- Parameters:
enterAdvice
- The type declaring the enter advice.exitAdvice
- The type declaring the exit advice.classFileLocator
- The class file locator for locating the advisory class's class file.- Returns:
- A method visitor wrapper representing the supplied advice.
-
to
protected static Advice to(TypeDescription enterAdvice, TypeDescription exitAdvice, Advice.PostProcessor.Factory postProcessorFactory, ClassFileLocator classFileLocator, List<? extends Advice.OffsetMapping.Factory<?>> userFactories, Advice.Delegator.Factory delegatorFactory, AsmClassReader.Factory classReaderFactory) Creates a new advice.- Parameters:
enterAdvice
- The type declaring the enter advice.exitAdvice
- The type declaring the exit advice.postProcessorFactory
- The post processor factory to use.classFileLocator
- The class file locator for locating the advisory class's class file.userFactories
- A list of custom factories for user generated offset mappings.delegatorFactory
- The delegator factory to use.classReaderFactory
- The class reader factory to use.- Returns:
- A method visitor wrapper representing the supplied advice.
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locate
private static Advice.Dispatcher.Unresolved locate(Class<? extends Annotation> type, MethodDescription.InDefinedShape property, Advice.Dispatcher.Unresolved dispatcher, MethodDescription.InDefinedShape methodDescription, Advice.Delegator.Factory delegatorFactory) Locates a dispatcher for the method if available.- Parameters:
type
- The annotation type that indicates a given form of advice that is currently resolved.property
- An annotation property that indicates if the advice method should be inlined.dispatcher
- Any previous dispatcher that was discovered or the previous dispatcher if found.methodDescription
- The method description that is considered as an advice method.delegatorFactory
- The delegator factory to use.- Returns:
- A resolved dispatcher or the previous dispatcher if none was found.
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withCustomMapping
Allows for the configuration of custom annotations that are then bound to a dynamically computed, constant value.- Returns:
- A builder for an
Advice
instrumentation with custom values. - See Also:
-
on
Returns an ASM visitor wrapper that matches the given matcher and applies this advice to the matched methods.- Parameters:
matcher
- The matcher identifying methods to apply the advice to.- Returns:
- A suitable ASM visitor wrapper with the compute frames option enabled.
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wrap
public org.objectweb.asm.MethodVisitor wrap(TypeDescription instrumentedType, MethodDescription instrumentedMethod, org.objectweb.asm.MethodVisitor methodVisitor, Implementation.Context implementationContext, TypePool typePool, int writerFlags, int readerFlags) Wraps a method visitor.- Specified by:
wrap
in interfaceAsmVisitorWrapper.ForDeclaredMethods.MethodVisitorWrapper
- Parameters:
instrumentedType
- The instrumented type.instrumentedMethod
- The method that is currently being defined.methodVisitor
- The original field visitor that defines the given method.implementationContext
- The implementation context to use.typePool
- The type pool to use.writerFlags
- The ASMClassWriter
reader flags to consider.readerFlags
- The ASMClassReader
reader flags to consider.- Returns:
- The wrapped method visitor.
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doWrap
protected org.objectweb.asm.MethodVisitor doWrap(TypeDescription instrumentedType, MethodDescription instrumentedMethod, org.objectweb.asm.MethodVisitor methodVisitor, Implementation.Context implementationContext, int writerFlags, int readerFlags) Wraps the method visitor to implement this advice.- Parameters:
instrumentedType
- The instrumented type.instrumentedMethod
- The instrumented method.methodVisitor
- The method visitor to write to.implementationContext
- The implementation context to use.writerFlags
- The ASM writer flags to use.readerFlags
- The ASM reader flags to use.- Returns:
- A method visitor that applies this advice.
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prepare
Prepares a given instrumented type.- Specified by:
prepare
in interfaceInstrumentedType.Prepareable
- Parameters:
instrumentedType
- The instrumented type in its current form.- Returns:
- The prepared instrumented type.
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appender
Creates a byte code appender that determines the implementation of the instrumented type's methods.- Specified by:
appender
in interfaceImplementation
- Parameters:
implementationTarget
- The target of the current implementation.- Returns:
- A byte code appender for implementing methods delegated to this implementation. This byte code appender
is also responsible for handling methods that were added by this implementation on the call to
InstrumentedType.Prepareable.prepare(InstrumentedType)
.
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withAssigner
Configures this advice to use the specified assigner. Any previous or default assigner is replaced.- Parameters:
assigner
- The assigner to use,- Returns:
- A version of this advice that uses the specified assigner.
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withExceptionPrinting
Configures this advice to callThrowable.printStackTrace()
upon a suppressed exception.- Returns:
- A version of this advice that prints any suppressed exception.
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withExceptionHandler
Configures this advice to execute the given stack manipulation upon a suppressed exception. The stack manipulation is executed with aThrowable
instance on the operand stack. The stack must be empty upon completing the exception handler.- Parameters:
exceptionHandler
- The exception handler to apply.- Returns:
- A version of this advice that applies the supplied exception handler.
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withExceptionHandler
Configures this advice to execute the given exception handler upon a suppressed exception. The stack manipulation is executed with aThrowable
instance on the operand stack. The stack must be empty upon completing the exception handler.- Parameters:
exceptionHandler
- The exception handler to apply.- Returns:
- A version of this advice that applies the supplied exception handler.
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wrap
Wraps the supplied implementation to have this advice applied around it.- Parameters:
implementation
- The implementation to wrap.- Returns:
- An implementation that applies the supplied implementation and wraps it with this advice.
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