About this series
Part 1 of this series introduced IBM® TXSeries® for Multiplatforms and IBM® Rational® Developer for Power Systems Software™, followed by instructions on installation and configuration of these products. Configuration of TXSeries included creating a region for deploying IBM® CICS® applications. Configuration of Rational Developer for Power Systems Software included installation of the Remote System Explorer component on an IBM® AIX® server and establishing a connection from Rational Developer for Power Systems Software to that server.
In Part 2, you use the configurations described in Part 1 to create CICS applications for TXSeries, using Rational Developer for Power Systems Software. Detailed steps have been provided to create a new AIX COBOL project and an AIX COBOL program file. A sample CICS application is also provided for reference in Listing 1. For building the AIX COBOL project, you can create a Makefile file using the code provided in Listing 2 in this article.
Create CICS applications using Rational Developer for Power Systems Software
This section helps you create a CICS COBOL application for TXSeries by using Rational Developer for Power Systems Software. The steps to use Rational Developer for Power Systems Software for creating an AIX COBOL project, and subsequently a CICS COBOL application for TXSeries, are explained in detail and illustrated with screen captures. Sample CICS COBOL application and a sample Makefile are provided for your reference. Although this article focuses on CICS COBOL applications, TXSeries CICS applications can also be written in C/C++. Essential guidelines have been provided in this article on developing C/C++ applications, wherever relevant (see "For C or C++:" notes).
Create a CICS COBOL application for TXSeries
Follow these steps to create a new CICS COBOL application using Rational Developer for Power Systems Software:
- Launch IBM Rational Developer for Power Systems Software on your workstation.
- Open the AIX COBOL perspective by selecting Window > Open Perspective > Other and choosing AIX COBOL from the menu.
Figure 1 shows the Open Perspective window.
Figure 1. Open Perspective menu options
- Use the TCP/IP connection to the AIX server, which was explained in Part 1, in the section titled "Configuring Rational Developer for Power Systems Software."
- To create a new AIX COBOL project, select File > New > AIX COBOL Project (see Figure 2).
Figure 2. Selections to create a new AIX COBOL project
- In the AIX COBOL Project window, enter the Project Name (for example,
HelloCOBOL) and the Remote Location:
- For Remote Location, enter the path of the AIX server where the CICS COBOL programs are located, in this form:
(AIX connection name) path
where AIX connection name is the connection mentioned in step 3, and path is the directory path where your CICS COBOL programs are located on AIX server.
- Alternatively, you can select Browse and, in the Browse For Folder window, select your AIX connection and select the directory path where your CICS COBOL programs are located.
- For Remote Location, enter the path of the AIX server where the CICS COBOL programs are located, in this form:
You also have the option to select the Associate a local location check box.
Figure 3 shows the Browse for Folder window, where you can choose the location for your COBOL project on the AIX server.
Figure 3. Steps to select the location for COBOL project on AIX server
- Click Finish.
You can then find your project in Project Explorer pane.
For C or C++:
For working with CICS applications written in C/C++, create a remote C/C++ project in Rational Developer for Power Systems Software. Also, add the .ccs and .cpp extensions to the list of file types supported.
- Right-click the AIX COBOL project in the Project Explorer pane, and select Properties.
- Select COBOL > Default Copybook location.
- In the right pane, make sure that the /usr/lpp/cics/include path is added as the first item in the list. You can use the Add and Up buttons to do this. This step is required if you use EIB-related fields in your CICS application.
Figure 4 shows the Properties window with the copybook path added.
Figure 4. Copybook path required for TXSeries CICS applications
- Right-click the HelloCOBOL project in the Project Explorer, and select New > AIX COBOL File.
- In the COBOL file window, select Type as COBOL source.
- In the File Name field, enter the COBOL file name (
HELLOPRG), and select cbl from the drop-down menu.
- Select the Initialize the file content from a template check box, and then select CICS Program source template from the Templates pane.
Figure 5 illustrates these steps to create a new AIX COBOL file.
Figure 5. Steps to create a new AIX COBOL file
- Click Finish.
- Enter your business logic in the appropriate section in the HELLOPRG.cbl file.
Rational Developer for Power Systems Software provides all of the modern integrated development environment (IDE) features, such as syntax highlighting and CICS command assist (auto-complete). You can use these features to develop your CICS/COBOL application.
A sample CICS COBOL application is provided in Listing 1 for your reference. It has two COBOL programs:
The following sample CICS COBOL application HELLOPRG.cbl receives data through COMMAREA. It does an EXEC CICS LINK to another program LINKPRG.cbl. After LINK is successful, HELLOPRG.cbl sends back the modified COMMAREA back to the client application. This can be extended to any complex business logic based on the requirements of the application.
Listing 1. Sample CICS COBOL application code
HELLOPRG.cbl IDENTIFICATION DIVISION. PROGRAM-ID. HELLOPRG. ENVIRONMENT DIVISION. DATA DIVISION. WORKING-STORAGE SECTION. 01 TEXT-OUT PIC X(16) VALUE 'HELLOPRG PROGRAM'. 01 RESP-CODE PIC S9(8) BINARY. LINKAGE SECTION. 01 DFHCOMMAREA. 03 OCCURS 0 TO 32767 TIMES DEPENDING ON EIBCALEN PIC X(1). PROCEDURE DIVISION. DISPLAY TEXT-OUT ": YOU HAVE SENT COMMAREA: " DFHCOMMAREA EXEC CICS LINK PROGRAM('LINKPRG') RESP(RESP-CODE) COMMAREA(DFHCOMMAREA) LENGTH(EIBCALEN) END-EXEC. IF RESP-CODE NOT = 0 THEN MOVE "LINK failure" TO DFHCOMMAREA ELSE MOVE "LINK success" TO DFHCOMMAREA END-IF. EXEC CICS RETURN END-EXEC. LINKPRG.cbl: IDENTIFICATION DIVISION. PROGRAM-ID. LINKPRG. ENVIRONMENT DIVISION. DATA DIVISION. WORKING-STORAGE SECTION. 01 TEXT-OUT PIC X(15) VALUE 'LINKPRG PROGRAM'. 01 RESP-MSG PIC S9(8) BINARY. LINKAGE SECTION. 01 DFHCOMMAREA. 03 OCCURS 0 TO 32767 TIMES DEPENDING ON EIBCALEN PIC X(1). PROCEDURE DIVISION. DISPLAY TEXT-OUT ":COMMAREA GOT THRU LINK: " DFHCOMMAREA EXEC CICS RETURN END-EXEC.
Create a Makefile file
- You need to create a Makefile file to build the HelloCOBOL project: Right-click the HelloCOBOL project, and select New > File.
- In the New File window (Figure 6), enter
Makefileas the File Name and click Finish.
Figure 6. Steps to create the Makefile file
You will now have an empty file called Makefile opened in the editor.
Sample Makefile code is provided in Listing 2.
- Modify the default value for the following variable in the sample Makefile code (you created this on the AIX server in Part 1, in the section titled "Creating and configuring the TXSeries region"):
TX_REGION > TXSeries region_name
- Save the file by selecting File > Save.
- In the Project menu, ensure that the Build Automatically option is selected. This initiates the build automatically, as you save your COBOL programs. Figure 7 shows this option.
Figure 7. Build automatically option in the Project menu
- If the Build Automatically option is not selected, you can right-click the HelloCOBOL project and select Build Project.
- You can check the status of the build in the Console view.
The Makefile code in Listing 2 compiles the TXSeries application programs written in the COBOL language. It will compile the latest modified programs. If the program is compiled for the first time, it adds the Program Definition (PD) entry in the TXSeries region Stanza file. It also links the compiled executable file to the specified region's bin directory.
You can use this sample Makefile for compiling your COBOL programs.
Listing 2. Sample Makefile code
.SUFFIXES: .SUFFIXES: .cbl .ibmcob TARGET = `ls -1 *.cbl | sed "s/.cbl/.ibmcob/"` # Setting all the flags required COB = cob2_r COB_OPTS = -g -qAPOST -qNOTHREAD -qLIB LINK_OPTS= -e _iwz_cobol_main CICS_OPTS= -qCICS -I$(CICSPATH)/include -I. -bI:$(CICSPATH)/lib/cicsprIBMCOB.exp # Setting TX_REGION variable to point to the TXSeries region TX_REGION=TXREG all: $(TARGET) .cbl.ibmcob: @slibclean # Compilation step $(COB) $< -o $@ $(COB_OPTS) $(CICS_OPTS) $(LINK_OPTS) # Providing a soft link of the executable to TXSeries region's bin directory @ln -fs $(PWD)/$@ /var/cics_regions/$(TX_REGION)/bin/$@ # Checking if PD entry already exists for the program and if not, adding an entry @progname=`basename $@ .ibmcob` && \ EntryCheck=`cicsget -c pd -r $(TX_REGION) $$progname 2>&1|grep ERZ046005E|wc -l` && \ if [ $$EntryCheck == 1 ] ; then \ cicsadd -c pd -B -r $(TX_REGION) $$progname PathName=$$progname RSLKey= public 2>/dev/null ;\ fi clean: @rm -f $(OBJ) core *.lst *.adt cmpout.xml $(TARGET)
Make sure to provide the tab space for the rules specified in the Makefile after copying the contents to Rational Developer for Power Systems Software. Set the TX_REGION variable in the Makefile to the appropriate region name. The -qCICS option in CICS_OPTS flag in the above Makefile file in Listing 2 is the CICS coprocessor option. This option is provided by COBOL to compile applications with CICS statements.
If you are creating a CICS COBOL program with the .ccp extension, modify the TARGET and add the appropriate rule in the Makefile, as Listing 3 shows.
Listing 3. Target and rule modification for .ccp programs in the Makefile file
TARGET = `ls -1 *.ccp 2>/dev/null | sed "s/.ccp/.ibmcob/"` .ccp.ibmcob: @slibclean @progname=`basename $@ .ibmcob` &&\ cicstcl -el IBMCOB $$progname &&\ ln -fs $(PWD)/$@ /var/cics_regions/$(TX_REGION)/bin/$@ &&\ EntryCheck=`cicsget -c pd -r $(TX_REGION) $$progname 2>&1|grep ERZ046005E|wc -l` &&\ if [ $$EntryCheck == 1 ] ; then\ cicsadd -c pd -B -r $(TX_REGION) $$progname PathName=$$progname RSLKey= public 2>/dev/null ;\ fi
For C or C++:
If you are creating a CICS C program with the .ccs extension, modify the TARGET and add the appropriate rule in the Makefile, as Listing 4 shows.
Listing 4. Target and rule modification for .ccs programs in the Makefile file
TARGET = `ls -1 *.ccs | sed "s/.ccs//"` .ccs: @slibclean cicstcl -elC $@ ln -fs $(PWD)/$@ /var/cics_regions/$(TX_REGION)/bin/$@ &&\ EntryCheck=`cicsget -c pd -r $(TX_REGION) $@ 2>&1|grep ERZ046005E|wc -l` &&\ if [ $$EntryCheck == 1 ] ; then\ cicsadd -c pd -B -r $(TX_REGION) $@ PathName=$@ RSLKey=public 2>/dev/null ;\ fi
If the application program uses FILE/TDQ operations, add the corresponding TXSeries resource definition using the
cicsadd command, and restart the TXSeries region in Cold mode for the resources to be operational. Starting the TXSeries region is explained in the section titled "Test the sample application" in Part 3 of this series.
This article explained how to develop TXSeries CICS applications on AIX server using Rational Developer for Power Systems Software. It also described deploying the CICS application onto TXSeries for Multiplatforms. Part 3 of this series will show you how to create a client project in Rational Developer for Power Systems Software and test your application by using CICS Transaction Gateway.
- Browse the TXSeries 7.1 information center and review the TXSeries product information.
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- Download and evaluate a free trial version IBM TXSeries for Multiplatforms.
- Explore the Enterprise Modernization Sandbox for Power Systems.
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