Examples with ReactiveObject org.drools.core.phreak.ReactiveObject used on opensource projects

Example 1 with ReactiveObject

use of org.drools.core.phreak.ReactiveObject in project drools by kiegroup.

the class DefaultBeanClassBuilder method implementReactivity.

private void implementReactivity(ClassWriter cw, ClassDefinition classDef) {
    final String LEFT_TUPLES_FIELD_NAME = "_lts";
    final String TYPE_NAME = BuildUtils.getInternalType(classDef.getClassName());
    FieldVisitor fv;
    /*
            private Collection<Tuple> _lts;
         */
    {
        fv = cw.visitField(ACC_PRIVATE, LEFT_TUPLES_FIELD_NAME, "Ljava/util/Collection;", "Ljava/util/Collection<Lorg/drools/core/spi/Tuple;>;", null);
        fv.visitEnd();
    }
    MethodVisitor mv;
    /*
            public void addLeftTuple(Tuple leftTuple) {
                if (_lts == null) {
                    _lts = new HashSet<Tuple>();
                }
                _lts.add(leftTuple);
            }
         */
    {
        mv = cw.visitMethod(ACC_PUBLIC, "addLeftTuple", "(Lorg/drools/core/spi/Tuple;)V", null, null);
        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitLineNumber(30, l0);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, TYPE_NAME, LEFT_TUPLES_FIELD_NAME, "Ljava/util/Collection;");
        Label l1 = new Label();
        mv.visitJumpInsn(IFNONNULL, l1);
        Label l2 = new Label();
        mv.visitLabel(l2);
        mv.visitLineNumber(31, l2);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitTypeInsn(NEW, "java/util/HashSet");
        mv.visitInsn(DUP);
        mv.visitMethodInsn(INVOKESPECIAL, "java/util/HashSet", "<init>", "()V", false);
        mv.visitFieldInsn(PUTFIELD, TYPE_NAME, LEFT_TUPLES_FIELD_NAME, "Ljava/util/Collection;");
        mv.visitLabel(l1);
        mv.visitLineNumber(33, l1);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, TYPE_NAME, LEFT_TUPLES_FIELD_NAME, "Ljava/util/Collection;");
        mv.visitVarInsn(ALOAD, 1);
        mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Collection", "add", "(Ljava/lang/Object;)Z", true);
        mv.visitInsn(POP);
        Label l3 = new Label();
        mv.visitLabel(l3);
        mv.visitLineNumber(34, l3);
        mv.visitInsn(RETURN);
        Label l4 = new Label();
        mv.visitLabel(l4);
        mv.visitLocalVariable("this", "L" + TYPE_NAME + ";", null, l0, l4, 0);
        mv.visitLocalVariable("leftTuple", "Lorg/drools/core/spi/Tuple;", null, l0, l4, 1);
        mv.visitMaxs(3, 2);
        mv.visitEnd();
    }
    /*
            public Collection<Tuple> getLeftTuples() {             
                return _lts != null ? _lts : Collections.emptyList();
            }                                                      
         */
    {
        mv = cw.visitMethod(ACC_PUBLIC, "getLeftTuples", "()Ljava/util/Collection;", "()Ljava/util/Collection<Lorg/drools/core/spi/Tuple;>;", null);
        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitLineNumber(37, l0);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, TYPE_NAME, LEFT_TUPLES_FIELD_NAME, "Ljava/util/Collection;");
        Label l1 = new Label();
        mv.visitJumpInsn(IFNULL, l1);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, TYPE_NAME, LEFT_TUPLES_FIELD_NAME, "Ljava/util/Collection;");
        Label l2 = new Label();
        mv.visitJumpInsn(GOTO, l2);
        mv.visitLabel(l1);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitMethodInsn(INVOKESTATIC, "java/util/Collections", "emptyList", "()Ljava/util/List;", false);
        mv.visitLabel(l2);
        mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { "java/util/Collection" });
        mv.visitInsn(ARETURN);
        Label l3 = new Label();
        mv.visitLabel(l3);
        mv.visitLocalVariable("this", "L" + TYPE_NAME + ";", null, l0, l3, 0);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    /*
            protected void notifyModification() {           
                ReactiveObjectUtil.notifyModification(this);
            }                                               
         */
    {
        mv = cw.visitMethod(ACC_PROTECTED, "notifyModification", "()V", null, null);
        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitLineNumber(41, l0);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESTATIC, "org/drools/core/phreak/ReactiveObjectUtil", "notifyModification", "(Lorg/drools/core/phreak/ReactiveObject;)V", false);
        Label l1 = new Label();
        mv.visitLabel(l1);
        mv.visitLineNumber(42, l1);
        mv.visitInsn(RETURN);
        Label l2 = new Label();
        mv.visitLabel(l2);
        mv.visitLocalVariable("this", "L" + TYPE_NAME + ";", null, l0, l2, 0);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    /*
            public void removeLeftTuple(Tuple leftTuple) {
                _lts.remove(leftTuple);
            }
         */
    {
        mv = cw.visitMethod(ACC_PUBLIC, "removeLeftTuple", "(Lorg/drools/core/spi/Tuple;)V", null, null);
        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitLineNumber(46, l0);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, TYPE_NAME, LEFT_TUPLES_FIELD_NAME, "Ljava/util/Collection;");
        mv.visitVarInsn(ALOAD, 1);
        mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Collection", "remove", "(Ljava/lang/Object;)Z", true);
        mv.visitInsn(POP);
        Label l1 = new Label();
        mv.visitLabel(l1);
        mv.visitLineNumber(47, l1);
        mv.visitInsn(RETURN);
        Label l2 = new Label();
        mv.visitLabel(l2);
        mv.visitLocalVariable("this", "Lorg/drools/core/phreak/AbstractReactiveObject;", null, l0, l2, 0);
        mv.visitLocalVariable("leftTuple", "Lorg/drools/core/spi/Tuple;", null, l0, l2, 1);
        mv.visitMaxs(2, 2);
        mv.visitEnd();
    }
}