com.avaje.ebean.enhance.agent

Class ConstructorDeferredCode

java.lang.Object

com.avaje.ebean.enhance.agent.ConstructorDeferredCode

All Implemented Interfaces:

Opcodes

public class ConstructorDeferredCode
extends Object
implements Opcodes

This is a class that 'defers' bytecode instructions in the default constructor initialisation such that code that initialises persistent many properties (Lists, Sets and Maps) is removed.

The purpose is to consume unwanted initialisation of Lists, Sets and Maps for OneToMany and ManyToMany properties.

  mv.visitVarInsn(ALOAD, 0);
  mv.visitTypeInsn(NEW, "java/util/ArrayList");
  mv.visitInsn(DUP);
  mv.visitMethodInsn(INVOKESPECIAL, "java/util/ArrayList", "", "()V", false);
  mv.visitTypeInsn(CHECKCAST, "java/util/List"); // OPTIONAL
  mv.visitFieldInsn(PUTFIELD, "test/model/WithInitialisedCollections", "contacts", "Ljava/util/List;");

 

Field Summary

Fields inherited from interface com.avaje.ebean.enhance.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

Method Summary

Modifier and Type	Method and Description
boolean	consumeVisitFieldInsn(int opcode, String owner, String name, String desc) Return true if we have consumed all the deferred code that initialises a persistent collection.
boolean	deferVisitInsn(int opcode) Return true if we defer this based on it being a DUP and was proceeded by a deferred ALOAD and NEW.
boolean	deferVisitMethodInsn(int opcode, String owner, String name, String desc, boolean itf) Return true if we defer this based on it being an init of a collection and was proceeded by a deferred DUP.
boolean	deferVisitTypeInsn(int opcode, String type) Return true if we defer this based on it being a NEW or CHECKCAST on persistent many and was proceeded by a deferred ALOAD (for NEW) or Collection init (for CHECKCAST).
boolean	deferVisitVarInsn(int opcode, int var) Return true if this is an ALOAD 0 which we defer.
protected void	flush() Flush all deferred instructions.

Methods inherited from class java.lang.Object

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

Method Detail

deferVisitVarInsn

public boolean deferVisitVarInsn(int opcode,
                                 int var)

Return true if this is an ALOAD 0 which we defer.

deferVisitTypeInsn

public boolean deferVisitTypeInsn(int opcode,
                                  String type)

Return true if we defer this based on it being a NEW or CHECKCAST on persistent many and was proceeded by a deferred ALOAD (for NEW) or Collection init (for CHECKCAST).

deferVisitInsn

public boolean deferVisitInsn(int opcode)

Return true if we defer this based on it being a DUP and was proceeded by a deferred ALOAD and NEW.

deferVisitMethodInsn

public boolean deferVisitMethodInsn(int opcode,
                                    String owner,
                                    String name,
                                    String desc,
                                    boolean itf)

Return true if we defer this based on it being an init of a collection and was proceeded by a deferred DUP.

consumeVisitFieldInsn

public boolean consumeVisitFieldInsn(int opcode,
                                     String owner,
                                     String name,
                                     String desc)

Return true if we have consumed all the deferred code that initialises a persistent collection.

flush

protected void flush()

Flush all deferred instructions.