Jerry文章《浅谈Java和SAP ABAP的静态代理和动态代理，以及ABAP面向切面编程的尝试一文的源代码》
2024-06-08 10:08:16
原文链接
导航目录
- 工具类ZCL_ABAP_DYNAMIC_PROXY_FACTORY
- 工具类zcl_abap_cglib_tool
- Jerry Wang的ABAP专题文章
工具类ZCL_ABAP_DYNAMIC_PROXY_FACTORY
该工具类负责生产一个新的具有持久化存储的静态代理类：
class ZCL_ABAP_DYNAMIC_PROXY_FACTORY definitionpublicfinalcreate public .public section.class-methods GET_PROXYimporting!IO_ORIGIN type ref to OBJECT!IV_NEW_CLASS_NAME type STRING!IV_PRE_EXIT type STRING!IV_POST_EXIT type STRINGreturningvalue(RO_PROXY) type ref to OBJECT .
protected section.
private section.class-data MS_VSEOCLASS type VSEOCLASS .class-data MT_ATTRIBUTE type SEOO_ATTRIBUTES_R .class-data MT_IMP_IF type SEOR_IMPLEMENTINGS_R .class-data MT_METHODS type SEOO_METHODS_R .class-data MT_PARAMETERS type SEOS_PARAMETERS_R .class-data MV_INTERFACE_NAME type STRING .class-data MV_METHOD_NAME type STRING .class-data MT_SOURCECODE type SEO_METHOD_SOURCE_TABLE .class-data MV_NEW_CLASS_NAME type STRING .class-data MO_ORIGIN type ref to OBJECT .class-data MV_PRE_EXIT type STRING .class-data MV_POST_EXIT type STRING .class-methods GENERATE_CLASS .class-methods PREPARE_ATTR_AND_SIGNATURE .class-methods PREPARE_SOURCE_CODE .class-methods EXTRACT_INTERFACE_INFOimporting!IO_ORIGIN type ref to OBJECT .class-methods INITimporting!IV_NEW_CLASS_NAME type STRING!IO_ORIGIN type ref to OBJECT!IV_PRE_EXIT type STRING!IV_POST_EXIT type STRING .class-methods CREATE_INSTANCEreturningvalue(RO_PROXY) type ref to OBJECT .
ENDCLASS.CLASS ZCL_ABAP_DYNAMIC_PROXY_FACTORY IMPLEMENTATION.* <SIGNATURE>---------------------------------------------------------------------------------------+
* | Static Private Method ZCL_ABAP_DYNAMIC_PROXY_FACTORY=>CREATE_INSTANCE
* +-------------------------------------------------------------------------------------------------+
* | [<-()] RO_PROXY TYPE REF TO OBJECT
* +--------------------------------------------------------------------------------------</SIGNATURE>method CREATE_INSTANCE.TRY.create object ro_proxy type (mv_new_class_name)EXPORTINGio_origin = mo_origin.CATCH cx_root INTO data(cx_root).WRITE:/ 'instance created failed: ', cx_root->get_text( ).ENDTRY.endmethod.* <SIGNATURE>---------------------------------------------------------------------------------------+
* | Static Private Method ZCL_ABAP_DYNAMIC_PROXY_FACTORY=>EXTRACT_INTERFACE_INFO
* +-------------------------------------------------------------------------------------------------+
* | [--->] IO_ORIGIN TYPE REF TO OBJECT
* +--------------------------------------------------------------------------------------</SIGNATURE>method EXTRACT_INTERFACE_INFO.data(lo_class) = cast CL_ABAP_OBJECTDESCR( cl_abap_objectdescr=>describe_by_object_ref( io_origin ) ).READ TABLE lo_class->interfaces INTO mv_interface_name INDEX 1 .CHECK sy-subrc = 0."For demo purpose, I assume only one method in one interfaceSELECT SINGLE cmpname INTO mv_method_name FROM seocompoWHERE clsname = mv_interface_name.endmethod.* <SIGNATURE>---------------------------------------------------------------------------------------+
* | Static Private Method ZCL_ABAP_DYNAMIC_PROXY_FACTORY=>GENERATE_CLASS
* +-------------------------------------------------------------------------------------------------+
* +--------------------------------------------------------------------------------------</SIGNATURE>METHOD generate_class.CALL FUNCTION 'SEO_CLASS_CREATE_COMPLETE'EXPORTINGdevclass = '$TMP'version = seoc_version_activeauthority_check = abap_trueoverwrite = abap_truesuppress_method_generation = abap_falsegenflag = abap_falsemethod_sources = mt_sourcecodesuppress_dialog = abap_trueCHANGINGclass = ms_vseoclassmethods = mt_methodsparameters = mt_parametersimplementings = mt_imp_ifattributes = mt_attributeEXCEPTIONSexisting = 1is_interface = 2db_error = 3component_error = 4no_access = 5other = 6OTHERS = 7.ENDMETHOD.* <SIGNATURE>---------------------------------------------------------------------------------------+
* | Static Public Method ZCL_ABAP_DYNAMIC_PROXY_FACTORY=>GET_PROXY
* +-------------------------------------------------------------------------------------------------+
* | [--->] IO_ORIGIN TYPE REF TO OBJECT
* | [--->] IV_NEW_CLASS_NAME TYPE STRING
* | [--->] IV_PRE_EXIT TYPE STRING
* | [--->] IV_POST_EXIT TYPE STRING
* | [<-()] RO_PROXY TYPE REF TO OBJECT
* +--------------------------------------------------------------------------------------</SIGNATURE>method GET_PROXY.init( iv_new_class_name = iv_new_class_name io_origin = io_originiv_pre_exit = iv_pre_exit iv_post_exit = iv_post_exit ).extract_interface_info( io_origin ).prepare_source_code( ).prepare_attr_and_signature( ).generate_class( ).ro_proxy = create_instance( ).endmethod.* <SIGNATURE>---------------------------------------------------------------------------------------+
* | Static Private Method ZCL_ABAP_DYNAMIC_PROXY_FACTORY=>INIT
* +-------------------------------------------------------------------------------------------------+
* | [--->] IV_NEW_CLASS_NAME TYPE STRING
* | [--->] IO_ORIGIN TYPE REF TO OBJECT
* | [--->] IV_PRE_EXIT TYPE STRING
* | [--->] IV_POST_EXIT TYPE STRING
* +--------------------------------------------------------------------------------------</SIGNATURE>method INIT.clear: mv_interface_name, mv_method_name, mt_sourcecode,mt_sourcecode,mt_imp_if, ms_vseoclass, mt_attribute,mt_parameters,mt_methods.mv_new_class_name = iv_new_class_name.mo_origin = io_origin.mv_pre_exit = iv_pre_exit.mv_post_exit = iv_post_exit.endmethod.* <SIGNATURE>---------------------------------------------------------------------------------------+
* | Static Private Method ZCL_ABAP_DYNAMIC_PROXY_FACTORY=>PREPARE_ATTR_AND_SIGNATURE
* +-------------------------------------------------------------------------------------------------+
* +--------------------------------------------------------------------------------------</SIGNATURE>METHOD prepare_attr_and_signature.DATA:ls_attribute LIKE LINE OF mt_attribute,ls_parameter LIKE LINE OF mt_parameters,ls_method LIKE LINE OF mt_methods.ls_method-clsname = mv_new_class_name.ls_method-cmpname = 'CONSTRUCTOR'.ls_method-state = 1. "implementedls_method-exposure = 2. "publicAPPEND ls_method TO mt_methods.ls_parameter-clsname = mv_new_class_name.ls_parameter-cmpname = 'CONSTRUCTOR'.ls_parameter-version = 1.ls_parameter-descript = 'Constructor automatically generated by Jerry'.ls_parameter-type = 'OBJECT'."mv_interface_name.ls_parameter-sconame = 'IO_ORIGIN'.ls_parameter-cmptype = 1. "METHODls_parameter-mtdtype = 0. "METHODls_parameter-pardecltyp = 0. "IMPORTINGls_parameter-parpasstyp = 1. "pass by referencels_parameter-typtype = 3. "type ref toAPPEND ls_parameter TO mt_parameters.ls_attribute-clsname = mv_new_class_name.ls_attribute-cmpname = 'MO_ORIGIN'.ls_attribute-state = 1.ls_attribute-attdecltyp = 0.ls_attribute-attexpvirt = 0. "privatels_attribute-typtype = 3. "type ref tols_attribute-type = 'OBJECT'."mv_interface_name.APPEND ls_attribute TO mt_attribute.ENDMETHOD.* <SIGNATURE>---------------------------------------------------------------------------------------+
* | Static Private Method ZCL_ABAP_DYNAMIC_PROXY_FACTORY=>PREPARE_SOURCE_CODE
* +-------------------------------------------------------------------------------------------------+
* +--------------------------------------------------------------------------------------</SIGNATURE>METHOD prepare_source_code.DATA: ls_method_source TYPE seo_method_source,ls_imp_if TYPE seor_implementing_r,ls_imp_det TYPE seoredef.ms_vseoclass-clsname = mv_new_class_name.ms_vseoclass-state = seoc_state_implemented.ms_vseoclass-exposure = seoc_exposure_public.ms_vseoclass-descript = `Dynamic proxy generated by Jerry's code`.ms_vseoclass-langu = sy-langu.ms_vseoclass-clsccincl = abap_true.ms_vseoclass-unicode = abap_true.ms_vseoclass-fixpt = abap_true.ms_vseoclass-clsfinal = abap_true.ls_imp_det = ls_imp_if-clsname = mv_new_class_name.ls_imp_det = ls_imp_if-refclsname = mv_interface_name.ls_imp_if-state = seoc_state_implemented.APPEND ls_imp_if TO mt_imp_if.CLEAR: ls_method_source.DATA: lv_name TYPE string.ls_method_source-cpdname = |{ mv_interface_name }~{ mv_method_name }|.APPEND |{ mv_pre_exit }| TO ls_method_source-source.APPEND |DATA(lo) = CAST { mv_interface_name }( mo_origin ).| to ls_method_source-source.APPEND 'lo->print( ).' TO ls_method_source-source.APPEND |{ mv_post_exit }| TO ls_method_source-source.APPEND ls_method_source TO mt_sourcecode.CLEAR: ls_method_source.ls_method_source-cpdname = 'CONSTRUCTOR'.APPEND 'mo_origin = io_origin.' TO ls_method_source-source.APPEND ls_method_source TO mt_sourcecode.ENDMETHOD.
ENDCLASS.
工具类zcl_abap_cglib_tool
这个类是Jerry仿照Java CGLIB(Code Generation Library)创建的, 针对传入的一个ABAP类，能创建一个生命周期只有当前会话(current session）内的代理类，该代理类是传入ABAP类的子类。这意味着传入的ABAP类必须能够被继承，不能被标记为final.
CLASS zcl_abap_cglib_tool DEFINITIONPUBLICFINALCREATE PUBLIC .PUBLIC SECTION.CLASS-METHODS get_proxyIMPORTING!iv_class_name TYPE string!io_pre_exit TYPE REF TO if_preexit!io_post_exit TYPE REF TO if_postexitRETURNINGVALUE(ro_proxy) TYPE REF TO object .PROTECTED SECTION.PRIVATE SECTION.CLASS-DATA mv_class_name TYPE string .CLASS-DATA mt_source TYPE seop_source_string .CLASS-DATA mo_proxy TYPE REF TO object .CLASS-DATA mo_preexit TYPE REF TO if_preexit .CLASS-DATA mo_postexit TYPE REF TO if_postexit .CLASS-METHODS generate_proxy .CLASS-METHODS get_source_code .
ENDCLASS.CLASS ZCL_ABAP_CGLIB_TOOL IMPLEMENTATION.* <SIGNATURE>---------------------------------------------------------------------------------------+
* | Static Private Method ZCL_ABAP_CGLIB_TOOL=>GENERATE_PROXY
* +-------------------------------------------------------------------------------------------------+
* +--------------------------------------------------------------------------------------</SIGNATURE>METHOD generate_proxy.DATA(lv_new_cls_name) = mv_class_name && '_SUB'.DATA(lv_inherit) = |inheriting from { mv_class_name }|.TRANSLATE lv_new_cls_name TO UPPER CASE.TRY.LOOP AT mt_source ASSIGNING FIELD-SYMBOL(<source1>) WHERE table_line CS mv_class_name.REPLACE mv_class_name IN <source1> WITH lv_new_cls_name.ENDLOOP.LOOP AT mt_source ASSIGNING FIELD-SYMBOL(<source>) WHERE table_line CS mv_class_name.DELETE mt_source INDEX ( sy-tabix + 1 ).INSERT lv_inherit INTO mt_source INDEX ( sy-tabix + 1 ).EXIT.ENDLOOP.GENERATE SUBROUTINE POOL mt_source NAME DATA(prog).WRITE: / sy-subrc.DATA(class) = |\\PROGRAM={ prog }\\CLASS={ lv_new_cls_name }|.CREATE OBJECT mo_proxy TYPE (class).CALL METHOD mo_proxy->('SET_PREEXIT')EXPORTINGio_preexit = mo_preexit.CALL METHOD mo_proxy->('SET_POSTEXIT')EXPORTINGio_postexit = mo_postexit.CATCH cx_root INTO DATA(cx_root).WRITE: / cx_root->get_text( ).ENDTRY.ENDMETHOD.* <SIGNATURE>---------------------------------------------------------------------------------------+
* | Static Public Method ZCL_ABAP_CGLIB_TOOL=>GET_PROXY
* +-------------------------------------------------------------------------------------------------+
* | [--->] IV_CLASS_NAME TYPE STRING
* | [--->] IO_PRE_EXIT TYPE REF TO IF_PREEXIT
* | [--->] IO_POST_EXIT TYPE REF TO IF_POSTEXIT
* | [<-()] RO_PROXY TYPE REF TO OBJECT
* +--------------------------------------------------------------------------------------</SIGNATURE>METHOD get_proxy.mv_class_name = iv_class_name.mo_preexit = io_pre_exit.mo_postexit = io_post_exit.CLEAR: mo_proxy.get_source_code( ).generate_proxy( ).ro_proxy = mo_proxy.ENDMETHOD.* <SIGNATURE>---------------------------------------------------------------------------------------+
* | Static Private Method ZCL_ABAP_CGLIB_TOOL=>GET_SOURCE_CODE
* +-------------------------------------------------------------------------------------------------+
* +--------------------------------------------------------------------------------------</SIGNATURE>METHOD get_source_code.DATA:cifkey TYPE seoclskey,clstype TYPE seoclstype,source TYPE seop_source_string,pool_source TYPE seop_source_string,l_string TYPE string,source_line TYPE LINE OF seop_source_string,tabix TYPE sytabix,includes TYPE seop_methods_w_include,include TYPE seop_method_w_include,cifref TYPE REF TO if_oo_clif_incl_naming,clsref TYPE REF TO if_oo_class_incl_naming,intref TYPE REF TO if_oo_interface_incl_naming.cifkey-clsname = mv_class_name.CALL METHOD cl_oo_include_naming=>get_instance_by_cifkeyEXPORTINGcifkey = cifkeyRECEIVINGcifref = cifrefEXCEPTIONSOTHERS = 1.ASSERT sy-subrc = 0.APPEND 'program.' TO mt_source.CHECK cifref->clstype = seoc_clstype_class.clsref ?= cifref.READ REPORT clsref->class_pool INTO pool_source.READ REPORT clsref->locals_old INTO source.LOOP AT source INTO source_line.IF source_line NS '*"*'.APPEND source_line TO mt_source..ENDIF.ENDLOOP.READ REPORT clsref->locals_def INTO source.LOOP AT source INTO source_line.IF source_line NS '*"*'.APPEND source_line TO mt_source..ENDIF.ENDLOOP.READ REPORT clsref->locals_imp INTO source.LOOP AT source INTO source_line.IF source_line NS '*"*'.APPEND source_line TO mt_source..ENDIF.ENDLOOP.READ REPORT clsref->public_section INTO source.LOOP AT source ASSIGNING FIELD-SYMBOL(<source_line>).IF <source_line> NS '*"*'.FIND REGEX '.*methods.*\.' IN <source_line> MATCH LENGTH DATA(lv_len).IF sy-subrc = 0.lv_len = lv_len - 1.<source_line> = <source_line>+0(lv_len).CONCATENATE <source_line> 'redefinition' '.' INTO <source_line> SEPARATED BY space.ENDIF.APPEND <source_line> TO mt_source.ENDIF.ENDLOOP.APPEND 'methods SET_PREEXIT importing !IO_PREEXIT type ref to IF_PREEXIT .' TO mt_source.APPEND 'methods SET_POSTEXIT importing !IO_POSTEXIT type ref to IF_POSTEXIT .' TO mt_source.READ REPORT clsref->protected_section INTO source.LOOP AT source INTO source_line.IF source_line NS '*"*'.APPEND source_line TO mt_source.ENDIF.ENDLOOP.READ REPORT clsref->private_section INTO source.LOOP AT source INTO source_line.IF source_line NS '*"*'.APPEND source_line TO mt_source.ENDIF.ENDLOOP.APPEND 'data MO_PREEXIT type ref to IF_PREEXIT .' TO mt_source.APPEND 'data MO_POSTEXIT type ref to IF_POSTEXIT .' TO mt_source.CONCATENATE 'CLASS' cifkey 'IMPLEMENTATION' INTO l_string SEPARATED BY space.LOOP AT pool_source FROM tabix INTO source_line.IF source_line CS 'ENDCLASS'.APPEND source_line TO mt_source..ENDIF.IF source_line CS l_string.SKIP.APPEND source_line TO mt_source..tabix = sy-tabix.EXIT.ENDIF.ENDLOOP.includes = clsref->get_all_method_includes( ).LOOP AT includes INTO include.READ REPORT include-incname INTO source.INSERT 'mo_preexit->execute( ).' INTO source INDEX 2.INSERT 'mo_postexit->execute( ).' INTO source INDEX ( lines( source ) ).LOOP AT source INTO source_line.APPEND source_line TO mt_source..ENDLOOP.ENDLOOP.APPEND 'method set_preexit. mo_preexit = IO_PREEXIT. endmethod.' TO mt_source.APPEND 'method set_postexit. mo_postexit = IO_POSTEXIT. endmethod.' TO mt_source.LOOP AT pool_source FROM tabix INTO source_line.IF source_line CS 'ENDCLASS'.APPEND source_line TO mt_source..ENDIF.ENDLOOP.ENDMETHOD.
ENDCLASS.
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