Discover and understand RPG applications with X- Analysis plug-in and Rational Developer for

Discover and understand
RPG applications with XAnalysis plug-in and
Rational Developer for
Power Systems Software
DATABOROUGH
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Table of Contents
Table of Contents
Introduction................................................................................2
Assumptions...................................................................................................................... 2
General Instructions ............................................................................................................2
Using X-Analysis .........................................................................4
Select Application Library on RSE..................................................................................... 5
Data Flow Diagram .........................................................................................................14
Structure Chart Diagram................................................................................................. 14
Expanded Structure Chart ..................................................................................................17
Detailed Structure Chart ....................................................................................................17
Source Browser ............................................................................................................... 18
Source Legend and Source Levels.......................................................................................19
View Source Modes ...........................................................................................................20
Pseudo Code....................................................................................................................21
Source Outline ................................................................................................................ 22
Program Structure Chart ................................................................................................ 23
Zoom in LPEX Editor........................................................................................................ 24
Annotate ......................................................................................................................... 25
Document Manager......................................................................................................... 28
Mark for Documenter ........................................................................................................28
Document produced ..........................................................................................................34
Variable Where Used....................................................................................................... 35
Meanings of Variable Where Used Levels.............................................................................38
Member X-Reference ......................................................................................................39
Enhanced Member X-Reference...................................................................................... 40
File Field Details.............................................................................................................. 41
LFs / Access Paths ..........................................................................................................42
Access Path Diagram ......................................................................................................43
Data Modelling ..........................................................................46
Conclusion.................................................................................50
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Introduction
Introduction
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Introduction
Introduction
Databorough's X-Analysis product suite is an essential Tool for IBM i application documentation,
design recovery, and modernization. X-Analysis for Eclipse is fully functional under RDp 7.5 enabling
the users to browse and visualize an application from high-level model right down to individual lines
of code. Data Model Extraction, RPG & COBOL as Pseudo code, variable level impact analysis,
Graphical Flow/Structure charts, MS Word/Visio wizards, Business Logic Extraction, test data
management, database and application modernization, are just some of the features packed into this
globally renowned tool.
The X-Analysis allows technical analysts to graphically navigate through an IBM i application from a
Windows PC. Working in a true client-server mode, X-Analysis automatically cross-references the
database and ensures that what is displayed is always up-to-date and a true representation of the
application on the IBM i.
Assumptions
It is assumed that the server and client components of X-Analysis are installed on IBM i and Windows
PC, respectively. It is also assumed that the demo library i.e. XAN4CDEM and its cross-reference
library i.e. XAN4CDXA have been successfully restored on the IBM i. For details, refer to the
X-Analysis_User_Manual.doc
If the above assumptions are correct, then we are ready to start with the tutorial chapters. Note that
this tutorial only teaches the usage of X-Analysis tool and not issues like Reverse Engineering or
Initialization of X-Analysis.
The tutorial is written in a step-by-step instructive manner and would help if the chapters are
followed sequentially.
General Instructions
When running X-Analysis, opt for actions either by:
•
•
•
•
Clicking on the relevant buttons on the Toolbar
Selecting the relevant options from the menu bar
Selecting the relevant options from the right click menu
Double click selects the most obvious action/command
Function key F1 brings up the context-sensitive help for the X-Analysis screens.
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Using X-Analysis
Using X-Analysis
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Access information
Please refer to the information in Table 1 during this tutorial exercise.
System i hostname
System i user ID
System i password
Application library
Workspace
Table 1. Access information for this tutorial
iseriesd.demos.ibm.com
SOADEMO
demo4you
XAN4CDEM
C:\PoT\SOAiV75\workspace
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Using X-Analysis
X-Analysis for Eclipse can be used in the following two ways:
•
•
Work With X-Analysis Perspective
X-Analysis as extension to RSE Perspective
In this tutorial we intend to display the usage of X-Analysis as an extension to the RSE Perspective.
Select Application Library on RSE
Start the RSE perspective on the IBM Rational Developer for Power Systems Software (RDp) 7.5
Select Application Library on RSE
Start RSE perspective on Rational Developer for Power Systems Software (RDp) 7.5 from the
Windows Start menu in the Sandbox menu and use the default workspace location to store your
files and folders.
If RDp is already started you can skip this step 1 and 2.
To start the product and set the workspace location:
1.
Click Start on the task bar of your virtual desktop.
2.
Select Programs > IBM Software Development Platform > IBM Rational Developer
for Power Systems Software v7.5 > Rational Developer for Power System Software, as
shown.
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ALT: Directory is C:\PoT\SOAiV75\workspace
Tip: Do not worry about the directory path or name, because it might vary
from one workstation to the other.
1. Click OK to open the workbench. The workbench opens and displays the
Welcome view.
2. Click the X in the Welcome or Getting Started tab to close the Welcome view.
RSE Perspective in RDp
Double click on IBM i… under ‘New Connection’ node to make a connection to IBM i where X-Analysis
Tutorial Application is installed. This invokes a new connection wizard. Following screen appears with
parent profile (PC name) name.
Connection Wizard in RSE Perspective
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Provide the IP of the IBM i and click ‘Finish’ to end the connection wizard.
System i hostname
System i user ID
System i password
Application library
Workspace
iseriesd.demos.ibm.com
SOADEMO
demo4you
XAN4CDEM
C:\PoT\SOAiV75\workspace
After the RSE Perspective prepares the connection, user can see the IBM i connection on the
Navigation View, as below.
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New Connection in RSE Perspective
To add an application library, expand ‘Work with Libraries’ under the IP node. This invokes the ‘New
Library Filter’ dialog.
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Adding Application Library to work with
Provide the library name as ‘XAN4CDEM’ which is the Tutorial Application Library and click ‘Next’. This
invokes the following dialog:
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New Library Filter dialog
Provide a relevant ‘Filter name’ for the application library being added. Let us call it ‘DemoApp’. Click
‘Finish’.
This action creates a new node in the name ‘DemoApp’ under the new connection IP added, as
shown below.
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‘DemoApp’ added as an Application Library Filter
Expand Filter Library, ‘DempApp’. This invokes the Sign On dialog for IBM i connection.
Sign On dialog to connect to IBM i
Provide a valid IBM i profile to sign on. After a valid sign on, this should display Application Library
‘XAN4CDEM’.
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Application Library under DemoApp Filter
Expand the application library. This should list all objects that belong to the application library
‘XAN4CDEM’.
Expanded View of Application Library
Let us invoke X-Analysis here. Locate *File object ‘CUSF’, on the expanded library view, and right
click on it. The context menu has X-Analysis as a menu option, as shown below:
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X-Analysis menu on CUSF object
The X-Analysis menu has two options, ‘Data Flow Diagram’ and ‘Zoom Source’. Let us opt for ‘Data
Flow Diagram’.
The user is presented with X-Analysis Login dialog when the X-Analysis option is taken for the first
time.
X-Analysis Login dialog
A valid user profile on the IBM i should be used to sign in.
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Data Flow Diagram
X-Analysis enables the user to see how the objects within an application relate to each other. ‘Data
Flow Diagram’ depicts this very nicely.
The option invokes the Data Flow Diagram, displaying Data Flow Diagram (DFD) for ‘CUSF’. User can
see how ‘CUSF’ fits into the application, i.e. what programs use ‘CUSF’, which one updates it, what
are the various Logical Views/Access Paths for ‘CUSF’.
Data flow Diagram for CUSF
Double clicking on any object from the DFD, displays the Data Flow Diagram
of that object. Double Click on ‘OE002’ to bring up the DFD for ‘OE002’.
Thus, the user can browse at will through a single large model.
Note the ‘Outline View’, which is associated with the Data Flow Diagram.
This displays the Outline DFD. X-Analysis determines the exact usage of
each field by examining the detail of the underlying source code.
The Data Flow Diagrams display various types of objects in different colours.
The type of Objects in the Data Flow Diagram can be interpreted using the
Legend dropdown bottom.
Structure Chart Diagram
The Structure Chart Diagram is a graphic display of the program’s call stack.
The diagram is color coded giving an overview of where the inputs, updates,
prints, etc. take place in the call stack of the program. Select the object
‘CUSFMAINT’ and right click on it. Opt for the ‘Structure Chart Diagram’ option.
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Structure Chart Diagram option
This invokes screen displaying the ‘Structure Chart Diagram’.
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Structure Chart Diagram for CUSFMAINT
Structure Chart Legend
From the above SCD, one can interpret that ‘CUSFMAINT’ calls five
programs. The nature of the called programs may be ascertained
through the Structure Chart legend bar.
The Structure Chart displayed above is the normal view of the Structure
chart Diagram. User has the options to view the ‘Expanded Structure
Chart’ or’ Detailed Structure Chart’, and can export the Structure Chart to
MS Visio (if installed on the PC). These are available as ‘Show Files’,
‘Show Narratives’ ‘and Export Options’ buttons respectively on Structure
Chart Diagram (SCD).
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Expanded Structure Chart
From the Structure Chart Diagram, click the ‘Show Files’ button from the toolbar. This brings up the
Expanded Structure Chart, displaying the I/O files for all the programs in the call stack.
Expanded Structure Chart Diagram for CUSFMAINT
Detailed Structure Chart
From the Structure Chart diagram, click the ‘Show Narratives’ button. This generates the detailed
structure chart showing the files used by each program along with the automatically generated
program narratives. This text is automatically recovered by X-Analysis from the application and
describes the program’s purpose
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Detailed Structure Chart Diagram for CUSFMAINT
Source Browser
From the SCD of the ‘CUSFMAINT’, user can also zoom to the source listing of the program. Select
‘Zoom Source’ option from the right click menu on ‘CUSFMAINT’.
Zoom Source Option
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This invokes the Source Browser for ‘CUSFMAINT’, as shown below:
Source Browser for CUSFMAINT
Source Legend and Source Levels
To understand the Source Code coloring, click the Source level icon available on the Zoom Source
Toolbar.
Option to Invoke Source Levels
The default source level is ‘Level 4’.
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Source Levels
To reduce the source level, select Level 1 from Source Level. This will reduce the source list to the
absolute minimum - just the subroutines and comments.
Source list – Comments Only
Increase the Source Level from 1 - 5 to see the number of source lines increase. Selecting
View/Source Level/Level 4 returns you to the normal source listing.
View Source Modes
The Source Mode, allow the user to view various Source Modes.
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Source Mode
Indented Source View
Select ‘Indented Source Code’ option, from the Source Mode dropdown button. The normal source
code for the ‘CUSFMAINT’ program is presented as indented source code.
Indented Source
Return to the normal view.
Pseudo Code
Click on the ‘Pseudo Code’ button available on the Source browser toolbar. Here, the Source Lines
are displayed as English like statements, as shown below:
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Pseudo Code
Return to the normal view by again clicking the pseudo code option button.
Source Outline
Source outline view lists all subroutines/modules and called programs available in the program source
code.
Option to Invoke Source Outline
Cursor is positioned to the particular line of code in the Source Browser when any of the items listed
in the outline view is double clicked.
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Source Outline
Program Structure Chart
Program Structure Chart graphically displays the sequence of calls in the program. The call could be
to execute a Subroutine / Program / Module / Service Program.
Select the ‘Program Structure Chart’ option from the ‘Diagramming Options’ dropdown, as shown
below:
Option to Invoke Program Structure Chart
Following diagram is displayed on selecting the ‘Program structure Chart’ option:
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Program Structure Chart
Subroutines are depicted as the small rectangles with gray background, displaying the name of the
subroutine. The object’s Function Type determines the coloring of all other icons viz. Programs,
Modules, and Service Programs. Icons other than subroutines are of the size of Program element as
on the Structure Chart. Program Structure Chart legend depicts the type of object displayed.
Program Structure Chart Legend
If there is no Main Procedure and there are only sub-procedures, then PSC displays
each Sub-Procedure's PSC independently, one after the other. If no Sub-Procedures
exists then PSC just display the program.
Zoom in LPEX Editor
Context menu on the programs in SCD also has an option to ‘Zoom in Lpex’. Take this option on
CUSFMAINT program, as shown below:
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Zoom in LPEX option
This action invokes the LPEX Editor with the program source.
LPEX Editor with CUSFMAINT Source
Annotate
X-Analysis provides the facility of annotating an object. Navigate back to the diagram displaying an
SCD for ‘CUSFMAINT’ object. Right click on ‘CUSFMAINT’ and select option 'Annotate', as shown
below:
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Annotate option
On selecting ‘Annotate’ option following dialog is displayed:
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Annotation Dialog to Add Text
The user can supply the annotation text to the selected object. On saving, the text gets stored in the
cross-reference repository. After having saved the annotation text, a small icon appears next to that
object on various diagrams, indicating that the object is annotated. (The user needs to refresh the
diagram to see the icon). The following screen displays annotation icon for ‘CUSFMAINT’ on SCD:
Annotate Icon for CUSFMAINT on Structure Chart Diagram
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User can see/modify annotate text using the same ‘Annotate’ option.
Document Manager
The Documenter facilitates the generation of MS Word Document containing System Design
information for the specified objects.
Mark for Documenter
The object to be documented is to be marked for documentation. To do this, right click on
‘CUSFMAINT’ from the Structure Chart Diagram and opt for ‘Mark for Documenter’.
Context menu on CUSFMAINT on Structure Chart Diagram
Double click on CUSFMAINT to generate its Data Flow Diagram. Mark ‘DISTS’ and ‘WWCUSF’ for
documenter as done for ‘CUSFMAINT’. Invoke Document Manager by clicking the ‘Generate System
Document’ option on ‘XAN4CDEM’ node as shown below:
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Launch System Document
This invokes the Document Manager, as shown below:
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Document Manager
The Document Manager lists all the objects that are marked for documentation. Click on the
‘Generate Document’ button to invoke the System Documentation Wizard, as shown below:
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System Documentation Wizard – Step 1
The wizard page provides the facility to choose the type of document, i.e.:
•
•
Single System Document: Single MS Word Document gets generated
Individual System Document: This generated one MS Word Document per object.
Select ‘Generate Single System Document’.
If you wish to specify the different file name or location other than the default file name/location,
click on the ‘Browse…’ button and specify the filename/location for the Document and click ‘Save’
button.
Click Next to invoke next screen of the wizard.
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System Documentation Wizard – Step 2
Step 2 of the ‘System Documentation Wizard’ allows the user to specify the contents to be included in
the documentation. Select from the features listed on the dialog, as shown above, besides already
selected features.
Click Next to invoke next screen of the wizard.
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System Documentation Wizard – Step 3
Confirm the sequence of the features to document and Click Next.
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System Documentation Wizard – Step 4
Select the formatting options for the document to be generated and click ‘Finish’ button to start the
documentation.
Document produced
The documenter runs and generates the required document. The documenter also creates Table of
contents and Index for the document.
Flow Charts are generated using MS Visio and are shown as hyperlinks in the PDF
document.
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Preview of the System Document
Variable Where Used
Locate *File object ‘CUSTS’, from the expanded library view, right click on it and select ‘Zoom Source’
option, as shown below:
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Zoom Source option for CUSTS
From the X-Analysis Source Browser, locate the variable ‘CUSNO’ using search on the Source
Browser. Right click on it and select the ‘All References’ option under the ‘File/Field Where Used’
submenu.
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Variable Where Used option for CUSNO
This action invokes ‘Variable Where Used’ View for ‘CUSNO’, listing all references of the field ‘CUSNO’
in file ‘CUSTS’, in the entire application.
Variable Where Used View for CUSTS/CUSNO
Variable Where Used (VWU) lists all the Source Lines where the field/variable of a file/program is
used/referenced, in the Member source and its associated Device Files and Copybooks, through out
the application for ‘CUSTS/CUSNO’
The ‘Variable Where Used Level’ menu, allow seven levels of VWU Viewing. As we select the higher
VWU level, references with greater indirections are displayed in the VWU view.
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Variable Where Used Levels Menu
The default level for ‘Variable Where Used’ (VWU Level) can be set using the
X-Analysis Preferences.
Meanings of Variable Where Used Levels
Each variable level has specific search criteria and it display records that comes under the search
criteria. The specific meaning associated with each level is as under:
Level 1: Direct references to the field.
Level 2: Records displayed at Level 1 along with the references to any other field, which refers the
first field.
Level 3: Records displayed at Level 2 along with further indirection/references to the field in level 2
referencing the first field.
Level 4: Records displayed at Level 3 along with the references where the Field has been passed as
parameter.
Level 5: All of the above and references where the Field has been passed as parameter in a function
which is in turn being called by another.
Level 6: All of the above and references to all the aliases of the Field.
Level 7: Tracks the usage of variable or field to maximum level of indirection. This level displays
Variable Where Used for all the above levels.
Note the differences of the results of Level 1 and Level 7. The above screen display Variable Where
Used results for Level 1 and it have 96 lines. Following screen display Variable Where Used results for
Level 7 and it have 168 lines.
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Variable Where Used at Level 7
Member X-Reference
Return to the Source Browser listing ‘CUSFMAINT’ source and locate the variable ‘CUSNO’. Right click
on it and select ‘Member X-Ref’, as shown below:
Member X-Ref option for ‘CUSNO’
Member X-Reference lists all the source lines where the selected Field / Variable is used / referenced.
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Member X-Ref on ‘CUSNO’
The Member X-Reference may be viewed at various levels using the ‘VWU level’ dropdown from the
toolbar.
Enhanced Member X-Reference
Select the variable ‘CUSNO’ from the Source Browser of CUSFMAINT. Right click on it and select
‘Enhanced Member X-Ref’ option, as shown below:
Enhanced Member X-Ref option for ‘CUSNO’
Enhanced Member X-Ref option displays the references of a variable in the member, along with the
information on how each subroutine deals that variable. It also presents the logical order in which the
variable actually gets used and not the order of how it is physically placed in the source.
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Enhanced Member X-Ref on ‘CUSNO’
File Field Details
File Field Details option displays the field details for a file. This option is only available for PF and LF
type objects.
File Field Details Menu
Return to the DFD for ‘CUSF’. Right click on it and opt for ‘File Field Details’. The following screen
displays the ‘File Field Details’ for CUSF:
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File Field Details for CUSF
LFs / Access Paths
LF / Access Paths option displays all Access Paths for the selected Physical File.
Right click menu option for LFs / Access Paths on CUSF
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LFs / File Access Paths for CUSF
The user can zoom into the source of an LF by either double clicking on it or by opting for Zoom
Source on context menu.
Access Path Diagram
Access Path Diagram is the diagrammatic representation of LF/Access Path list. 'LF/Access Path' lists
all the available access paths for the selected Physical File, whereas the ‘Access Path Diagram’
displays them diagrammatically.
Navigate back to the Data Flow Diagram for CUSF and select the option ‘Access Path Diagram’ as
shown below:
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Right click menu option for Access Path Diagram
On selecting the ‘Access Path Diagram’ following diagram is displayed:
Access Path Diagram for CUSF
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Data Modelling
Data Modelling
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Data Modelling
Data Modelling
Data Model Diagram displays the file relationships for an individual file object. Switch to the DFD for
‘CUSF’ and select ‘Data Model Diagram’ option on the right click menu, as shown below:
Data Model Diagram option on CUSF
This brings up the DMD for CUSF object.
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Data Modelling
DMD for CUSF
‘DMD Details’ is also shown below the DMD. This displays the ‘File Connection Details’ for the DMD.
Single click on a specific DMD Object displays the references of that object only. Click on ‘PTYPES’
object on the DMD and it displays the relations for ‘PTYPES’ only, as shown below:
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Data Modelling
DMD Displaying Relations for PTYPES
•
When the user clicks on a specific relation on the ‘DMD Details’, the DMD shows only those
objects connected that are on the selected relation.
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Conclusion
Conclusion
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Conclusion
Conclusion
We just experienced a few key features of X-Analysis as an extension to RSE perspective. In order to
experience the full potential of X-Analysis, use X-Analysis Perspective under IBM Rational products
7.x or Eclipse 3.2 and above.
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