jmplib.agent.impl

Class ChangeWriterTransformer

java.lang.Object

jmplib.agent.AbstractTransformer

jmplib.agent.impl.ChangeWriterTransformer

All Implemented Interfaces:

java.lang.instrument.ClassFileTransformer, org.objectweb.asm.Opcodes

public class ChangeWriterTransformer
extends AbstractTransformer
implements org.objectweb.asm.Opcodes

This transformer writes the modified bytecode in the modified classpath.

Author:

Ignacio Lagartos

Field Summary

Fields inherited from interface org.objectweb.asm.Opcodes

AALOAD, AASTORE, ACC_ABSTRACT, ACC_ANNOTATION, ACC_BRIDGE, ACC_DEPRECATED, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_MANDATED, ACC_NATIVE, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, ACC_VARARGS, ACC_VOLATILE, ACONST_NULL, ALOAD, ANEWARRAY, ARETURN, ARRAYLENGTH, ASM4, ASM5, ASTORE, ATHROW, BALOAD, BASTORE, BIPUSH, CALOAD, CASTORE, CHECKCAST, D2F, D2I, D2L, DADD, DALOAD, DASTORE, DCMPG, DCMPL, DCONST_0, DCONST_1, DDIV, DLOAD, DMUL, DNEG, DOUBLE, DREM, DRETURN, DSTORE, DSUB, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, F_APPEND, F_CHOP, F_FULL, F_NEW, F_SAME, F_SAME1, F2D, F2I, F2L, FADD, FALOAD, FASTORE, FCMPG, FCMPL, FCONST_0, FCONST_1, FCONST_2, FDIV, FLOAD, FLOAT, FMUL, FNEG, FREM, FRETURN, FSTORE, FSUB, GETFIELD, GETSTATIC, GOTO, H_GETFIELD, H_GETSTATIC, H_INVOKEINTERFACE, H_INVOKESPECIAL, H_INVOKESTATIC, H_INVOKEVIRTUAL, H_NEWINVOKESPECIAL, H_PUTFIELD, H_PUTSTATIC, I2B, I2C, I2D, I2F, I2L, I2S, IADD, IALOAD, IAND, IASTORE, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, ICONST_M1, IDIV, IF_ACMPEQ, IF_ACMPNE, IF_ICMPEQ, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ICMPLT, IF_ICMPNE, IFEQ, IFGE, IFGT, IFLE, IFLT, IFNE, IFNONNULL, IFNULL, IINC, ILOAD, IMUL, INEG, INSTANCEOF, INTEGER, INVOKEDYNAMIC, INVOKEINTERFACE, INVOKESPECIAL, INVOKESTATIC, INVOKEVIRTUAL, IOR, IREM, IRETURN, ISHL, ISHR, ISTORE, ISUB, IUSHR, IXOR, JSR, L2D, L2F, L2I, LADD, LALOAD, LAND, LASTORE, LCMP, LCONST_0, LCONST_1, LDC, LDIV, LLOAD, LMUL, LNEG, LONG, LOOKUPSWITCH, LOR, LREM, LRETURN, LSHL, LSHR, LSTORE, LSUB, LUSHR, LXOR, MONITORENTER, MONITOREXIT, MULTIANEWARRAY, NEW, NEWARRAY, NOP, NULL, POP, POP2, PUTFIELD, PUTSTATIC, RET, RETURN, SALOAD, SASTORE, SIPUSH, SWAP, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TABLESWITCH, TOP, UNINITIALIZED_THIS, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8

Constructor Summary

Constructors

Constructor and Description
ChangeWriterTransformer()

Method Summary

Modifier and Type	Method and Description
protected boolean	instrumentableClass(java.lang.String className, java.lang.Class<?> classBeingRedefined) It is aplicable when it is the first load of the class and the class is inside the instrumentables collection inside the UpdaterAgent class.
byte[]	transform(java.lang.String className, java.lang.Class<?> classBeingRedefined, byte[] classfileBuffer) Writes the modified bytecode in the modified classpath.

Methods inherited from class jmplib.agent.AbstractTransformer

transform

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ChangeWriterTransformer

public ChangeWriterTransformer()

Method Detail

instrumentableClass

protected boolean instrumentableClass(java.lang.String className,
                                      java.lang.Class<?> classBeingRedefined)

It is aplicable when it is the first load of the class and the class is inside the instrumentables collection inside the UpdaterAgent class.

Specified by:

instrumentableClass in class AbstractTransformer

Parameters:

className - The internal class name

classBeingRedefined - The Class object

Returns:

transform

public byte[] transform(java.lang.String className,
                        java.lang.Class<?> classBeingRedefined,
                        byte[] classfileBuffer)

Writes the modified bytecode in the modified classpath.

Specified by:

transform in class AbstractTransformer

Parameters:

className - The internal class name

classBeingRedefined - The Class object or nullF

classfileBuffer - The bytes of the class

Returns: