Package net.bytebuddy.agent.builder
Class AgentBuilder.Default.ExecutingTransformer
- java.lang.Object
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- net.bytebuddy.agent.builder.ResettableClassFileTransformer.AbstractBase
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- net.bytebuddy.agent.builder.AgentBuilder.Default.ExecutingTransformer
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- All Implemented Interfaces:
java.lang.instrument.ClassFileTransformer
,ResettableClassFileTransformer
- Enclosing class:
- AgentBuilder.Default
protected static class AgentBuilder.Default.ExecutingTransformer extends ResettableClassFileTransformer.AbstractBase
AClassFileTransformer
that implements the enclosing agent builder's configuration.
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Nested Class Summary
Nested Classes Modifier and Type Class Description protected static interface
AgentBuilder.Default.ExecutingTransformer.Factory
A factory for creating aClassFileTransformer
for the current VM.protected class
AgentBuilder.Default.ExecutingTransformer.Java9CapableVmDispatcher
A privileged action for transforming a class on a JVM that supports modules.protected class
AgentBuilder.Default.ExecutingTransformer.LegacyVmDispatcher
A privileged action for transforming a class on a JVM prior to Java 9.-
Nested classes/interfaces inherited from interface net.bytebuddy.agent.builder.ResettableClassFileTransformer
ResettableClassFileTransformer.AbstractBase
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Field Summary
Fields Modifier and Type Field Description private java.security.AccessControlContext
accessControlContext
The access control context to use for loading classes.private AgentBuilder.Default.BootstrapInjectionStrategy
bootstrapInjectionStrategy
The injection strategy for injecting classes into the bootstrap class loader.private ByteBuddy
byteBuddy
The Byte Buddy instance to be used.private AgentBuilder.CircularityLock
circularityLock
A lock that prevents circular class transformations.private AgentBuilder.ClassFileBufferStrategy
classFileBufferStrategy
The class file buffer strategy to use.private AgentBuilder.DescriptionStrategy
descriptionStrategy
The description strategy for resolving type descriptions for types.protected static AgentBuilder.Default.ExecutingTransformer.Factory
FACTORY
A factory for creating aClassFileTransformer
that supports the features of the current VM.private AgentBuilder.FallbackStrategy
fallbackStrategy
The fallback strategy to use.private AgentBuilder.RawMatcher
ignoredTypeMatcher
Identifies types that should not be instrumented.private AgentBuilder.InitializationStrategy
initializationStrategy
The initialization strategy to use for transformed types.private AgentBuilder.InstallationListener
installationListener
The installation listener to notify.private AgentBuilder.LambdaInstrumentationStrategy
lambdaInstrumentationStrategy
The lambda instrumentation strategy to use.private AgentBuilder.Listener
listener
The listener to notify on transformations.private AgentBuilder.LocationStrategy
locationStrategy
The location strategy to use.private AgentBuilder.Default.NativeMethodStrategy
nativeMethodStrategy
The native method strategy to apply.private AgentBuilder.PoolStrategy
poolStrategy
The type locator to use.private AgentBuilder.Default.Transformation
transformation
The transformation object for handling type transformations.private AgentBuilder.TypeStrategy
typeStrategy
The definition handler to use.
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Constructor Summary
Constructors Constructor Description ExecutingTransformer(ByteBuddy byteBuddy, AgentBuilder.Listener listener, AgentBuilder.PoolStrategy poolStrategy, AgentBuilder.TypeStrategy typeStrategy, AgentBuilder.LocationStrategy locationStrategy, AgentBuilder.Default.NativeMethodStrategy nativeMethodStrategy, AgentBuilder.InitializationStrategy initializationStrategy, AgentBuilder.Default.BootstrapInjectionStrategy bootstrapInjectionStrategy, AgentBuilder.LambdaInstrumentationStrategy lambdaInstrumentationStrategy, AgentBuilder.DescriptionStrategy descriptionStrategy, AgentBuilder.FallbackStrategy fallbackStrategy, AgentBuilder.ClassFileBufferStrategy classFileBufferStrategy, AgentBuilder.InstallationListener installationListener, AgentBuilder.RawMatcher ignoredTypeMatcher, AgentBuilder.Default.Transformation transformation, AgentBuilder.CircularityLock circularityLock)
Creates a new class file transformer.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description private byte[]
doTransform(JavaModule module, java.lang.ClassLoader classLoader, java.lang.String typeName, java.lang.Class<?> classBeingRedefined, boolean loaded, java.security.ProtectionDomain protectionDomain, TypePool typePool, ClassFileLocator classFileLocator)
Applies a transformation for a class that was captured by thisClassFileTransformer
.boolean
reset(java.lang.instrument.Instrumentation instrumentation, AgentBuilder.RedefinitionStrategy redefinitionStrategy, AgentBuilder.RedefinitionStrategy.DiscoveryStrategy redefinitionDiscoveryStrategy, AgentBuilder.RedefinitionStrategy.BatchAllocator redefinitionBatchAllocator, AgentBuilder.RedefinitionStrategy.Listener redefinitionListener)
Deregisters this class file transformer and redefines any transformed class to its state without this class file transformer applied, if the supplied redefinition strategy is enabled.private AgentBuilder.Default.Transformation.Resolution
resolve(JavaModule module, java.lang.ClassLoader classLoader, java.lang.String typeName, java.lang.Class<?> classBeingRedefined, boolean loaded, java.security.ProtectionDomain protectionDomain, TypePool typePool)
Resolves the transformation and assures it is not ignored.byte[]
transform(java.lang.ClassLoader classLoader, java.lang.String internalTypeName, java.lang.Class<?> classBeingRedefined, java.security.ProtectionDomain protectionDomain, byte[] binaryRepresentation)
protected byte[]
transform(java.lang.Object rawModule, java.lang.ClassLoader classLoader, java.lang.String internalTypeName, java.lang.Class<?> classBeingRedefined, java.security.ProtectionDomain protectionDomain, byte[] binaryRepresentation)
Applies a transformation for a class that was captured by thisClassFileTransformer
.private byte[]
transform(JavaModule module, java.lang.ClassLoader classLoader, java.lang.String internalTypeName, java.lang.Class<?> classBeingRedefined, java.security.ProtectionDomain protectionDomain, byte[] binaryRepresentation)
Applies a transformation for a class that was captured by thisClassFileTransformer
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Methods inherited from class net.bytebuddy.agent.builder.ResettableClassFileTransformer.AbstractBase
reset, reset, reset, reset, reset, reset
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Field Detail
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FACTORY
protected static final AgentBuilder.Default.ExecutingTransformer.Factory FACTORY
A factory for creating aClassFileTransformer
that supports the features of the current VM.
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byteBuddy
private final ByteBuddy byteBuddy
The Byte Buddy instance to be used.
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poolStrategy
private final AgentBuilder.PoolStrategy poolStrategy
The type locator to use.
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typeStrategy
private final AgentBuilder.TypeStrategy typeStrategy
The definition handler to use.
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listener
private final AgentBuilder.Listener listener
The listener to notify on transformations.
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nativeMethodStrategy
private final AgentBuilder.Default.NativeMethodStrategy nativeMethodStrategy
The native method strategy to apply.
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initializationStrategy
private final AgentBuilder.InitializationStrategy initializationStrategy
The initialization strategy to use for transformed types.
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bootstrapInjectionStrategy
private final AgentBuilder.Default.BootstrapInjectionStrategy bootstrapInjectionStrategy
The injection strategy for injecting classes into the bootstrap class loader.
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lambdaInstrumentationStrategy
private final AgentBuilder.LambdaInstrumentationStrategy lambdaInstrumentationStrategy
The lambda instrumentation strategy to use.
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descriptionStrategy
private final AgentBuilder.DescriptionStrategy descriptionStrategy
The description strategy for resolving type descriptions for types.
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locationStrategy
private final AgentBuilder.LocationStrategy locationStrategy
The location strategy to use.
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fallbackStrategy
private final AgentBuilder.FallbackStrategy fallbackStrategy
The fallback strategy to use.
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classFileBufferStrategy
private final AgentBuilder.ClassFileBufferStrategy classFileBufferStrategy
The class file buffer strategy to use.
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installationListener
private final AgentBuilder.InstallationListener installationListener
The installation listener to notify.
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ignoredTypeMatcher
private final AgentBuilder.RawMatcher ignoredTypeMatcher
Identifies types that should not be instrumented.
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transformation
private final AgentBuilder.Default.Transformation transformation
The transformation object for handling type transformations.
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circularityLock
private final AgentBuilder.CircularityLock circularityLock
A lock that prevents circular class transformations.
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accessControlContext
private final java.security.AccessControlContext accessControlContext
The access control context to use for loading classes.
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Constructor Detail
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ExecutingTransformer
public ExecutingTransformer(ByteBuddy byteBuddy, AgentBuilder.Listener listener, AgentBuilder.PoolStrategy poolStrategy, AgentBuilder.TypeStrategy typeStrategy, AgentBuilder.LocationStrategy locationStrategy, AgentBuilder.Default.NativeMethodStrategy nativeMethodStrategy, AgentBuilder.InitializationStrategy initializationStrategy, AgentBuilder.Default.BootstrapInjectionStrategy bootstrapInjectionStrategy, AgentBuilder.LambdaInstrumentationStrategy lambdaInstrumentationStrategy, AgentBuilder.DescriptionStrategy descriptionStrategy, AgentBuilder.FallbackStrategy fallbackStrategy, AgentBuilder.ClassFileBufferStrategy classFileBufferStrategy, AgentBuilder.InstallationListener installationListener, AgentBuilder.RawMatcher ignoredTypeMatcher, AgentBuilder.Default.Transformation transformation, AgentBuilder.CircularityLock circularityLock)
Creates a new class file transformer.- Parameters:
byteBuddy
- The Byte Buddy instance to be used.listener
- The listener to notify on transformations.poolStrategy
- The type locator to use.typeStrategy
- The definition handler to use.locationStrategy
- The location strategy to use.nativeMethodStrategy
- The native method strategy to apply.initializationStrategy
- The initialization strategy to use for transformed types.bootstrapInjectionStrategy
- The injection strategy for injecting classes into the bootstrap class loader.lambdaInstrumentationStrategy
- The lambda instrumentation strategy to use.descriptionStrategy
- The description strategy for resolving type descriptions for types.fallbackStrategy
- The fallback strategy to use.installationListener
- The installation listener to notify.classFileBufferStrategy
- The class file buffer strategy to use.ignoredTypeMatcher
- Identifies types that should not be instrumented.transformation
- The transformation object for handling type transformations.circularityLock
- The circularity lock to use.
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Method Detail
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transform
public byte[] transform(java.lang.ClassLoader classLoader, java.lang.String internalTypeName, java.lang.Class<?> classBeingRedefined, java.security.ProtectionDomain protectionDomain, byte[] binaryRepresentation)
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transform
protected byte[] transform(java.lang.Object rawModule, java.lang.ClassLoader classLoader, java.lang.String internalTypeName, java.lang.Class<?> classBeingRedefined, java.security.ProtectionDomain protectionDomain, byte[] binaryRepresentation)
Applies a transformation for a class that was captured by thisClassFileTransformer
. Invoking this method allows to process module information which is available since Java 9.- Parameters:
rawModule
- The instrumented class's Javajava.lang.Module
.classLoader
- The type's class loader ornull
if the type is loaded by the bootstrap loader.internalTypeName
- The internal name of the instrumented class.classBeingRedefined
- The loadedClass
being redefined ornull
if no such class exists.protectionDomain
- The instrumented type's protection domain.binaryRepresentation
- The class file of the instrumented class in its current state.- Returns:
- The transformed class file or an empty byte array if this transformer does not apply an instrumentation.
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transform
private byte[] transform(JavaModule module, java.lang.ClassLoader classLoader, java.lang.String internalTypeName, java.lang.Class<?> classBeingRedefined, java.security.ProtectionDomain protectionDomain, byte[] binaryRepresentation)
Applies a transformation for a class that was captured by thisClassFileTransformer
.- Parameters:
module
- The instrumented class's Java module in its wrapped form ornull
if the current VM does not support modules.classLoader
- The instrumented class's class loader.internalTypeName
- The internal name of the instrumented class.classBeingRedefined
- The loadedClass
being redefined ornull
if no such class exists.protectionDomain
- The instrumented type's protection domain.binaryRepresentation
- The class file of the instrumented class in its current state.- Returns:
- The transformed class file or an empty byte array if this transformer does not apply an instrumentation.
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doTransform
private byte[] doTransform(JavaModule module, java.lang.ClassLoader classLoader, java.lang.String typeName, java.lang.Class<?> classBeingRedefined, boolean loaded, java.security.ProtectionDomain protectionDomain, TypePool typePool, ClassFileLocator classFileLocator)
Applies a transformation for a class that was captured by thisClassFileTransformer
.- Parameters:
module
- The instrumented class's Java module in its wrapped form ornull
if the current VM does not support modules.classLoader
- The instrumented class's class loader.typeName
- The binary name of the instrumented class.classBeingRedefined
- The loadedClass
being redefined ornull
if no such class exists.loaded
-true
if the instrumented type is loaded.protectionDomain
- The instrumented type's protection domain.typePool
- The type pool to use.classFileLocator
- The class file locator to use.- Returns:
- The transformed class file or an empty byte array if this transformer does not apply an instrumentation.
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resolve
private AgentBuilder.Default.Transformation.Resolution resolve(JavaModule module, java.lang.ClassLoader classLoader, java.lang.String typeName, java.lang.Class<?> classBeingRedefined, boolean loaded, java.security.ProtectionDomain protectionDomain, TypePool typePool)
Resolves the transformation and assures it is not ignored.- Parameters:
module
- The instrumented class's Java module in its wrapped form ornull
if the current VM does not support modules.classLoader
- The instrumented class's class loader.typeName
- The binary name of the instrumented class.classBeingRedefined
- The loadedClass
being redefined ornull
if no such class exists.loaded
-true
if the instrumented type is loaded.protectionDomain
- The instrumented type's protection domain.typePool
- The type pool to use.- Returns:
- The resolution for the transformation.
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reset
public boolean reset(java.lang.instrument.Instrumentation instrumentation, AgentBuilder.RedefinitionStrategy redefinitionStrategy, AgentBuilder.RedefinitionStrategy.DiscoveryStrategy redefinitionDiscoveryStrategy, AgentBuilder.RedefinitionStrategy.BatchAllocator redefinitionBatchAllocator, AgentBuilder.RedefinitionStrategy.Listener redefinitionListener)
Deregisters this class file transformer and redefines any transformed class to its state without this class file transformer applied, if the supplied redefinition strategy is enabled. If it is not enabled, only the
AgentBuilder.InstallationListener
is informed about the resetting without undoing any code changes.Note: A reset class file transformer should not be reinstalled. Instead, the
AgentBuilder
which built the transformer should be asked to install a new transformer.Important: Most JVMs do not support changes of a class's structure after a class was already loaded. Therefore, it is typically required that this class file transformer was built while enabling
AgentBuilder.disableClassFormatChanges()
.- Parameters:
instrumentation
- The instrumentation instance from which to deregister the transformer.redefinitionStrategy
- The redefinition to apply.redefinitionDiscoveryStrategy
- The discovery strategy for the types to reset.redefinitionBatchAllocator
- The batch allocator to use.redefinitionListener
- The redefinition listener to apply.- Returns:
true
if a reset was applied and this transformer was not previously removed.
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