/**
* ABAP APIs often uses complex parameters. This example demonstrates how to read the values from
* a structure.
*
* @throws com.sap.conn.jco.JCoException
*/
public static void step3WorkWithStructure() throws JCoException {
JCoDestination destination = JCoDestinationManager.getDestination(ABAP_AS_POOLED);
JCoFunction function = destination.getRepository().getFunction("RFC_SYSTEM_INFO");
if (function == null) throw new RuntimeException("RFC_SYSTEM_INFO not found in SAP.");
try {
function.execute(destination);
} catch (AbapException e) {
System.out.println(e.toString());
return;
}
JCoStructure exportStructure = function.getExportParameterList().getStructure("RFCSI_EXPORT");
System.out.println("System info for " + destination.getAttributes().getSystemID() + ":\n");
// The structure contains some fields. The loop just prints out each field with its name.
for (int i = 0; i < exportStructure.getMetaData().getFieldCount(); i++) {
System.out.println(
exportStructure.getMetaData().getName(i) + ":\t" + exportStructure.getString(i));
}
System.out.println();
// JCo still supports the JCoFields, but direct access via getXXX is more efficient as field
// iterator
System.out.println(
"The same using field iterator: \nSystem info for "
+ destination.getAttributes().getSystemID()
+ ":\n");
for (JCoField field : exportStructure) {
System.out.println(field.getName() + ":\t" + field.getString());
}
System.out.println();
}
/**
* This example uses a connection pool. However, the implementation of the application logic is
* still the same. Creation of pools and pool management are handled by the JCo runtime.
*
* @throws com.sap.conn.jco.JCoException
*/
public static void step2ConnectUsingPool() throws JCoException {
JCoDestination destination = JCoDestinationManager.getDestination(ABAP_AS_POOLED);
destination.ping();
System.out.println("Attributes:");
System.out.println(destination.getAttributes());
System.out.println();
}
/**
* The following example executes a simple RFC function STFC_CONNECTION. In contrast to JCo 2 you
* do not need to take care of repository management. JCo 3 manages the repository caches
* internally and shares the available function metadata as much as possible.
*
* @throws com.sap.conn.jco.JCoException
*/
public static void step3SimpleCall() throws JCoException {
// JCoDestination is the logic address of an ABAP system and ...
JCoDestination destination = JCoDestinationManager.getDestination(ABAP_AS_POOLED);
// ... it always has a reference to a metadata repository
JCoFunction function = destination.getRepository().getFunction("STFC_CONNECTION");
if (function == null) throw new RuntimeException("BAPI_COMPANYCODE_GETLIST not found in SAP.");
// JCoFunction is container for function values. Each function contains separate
// containers for import, export, changing and table parameters.
// To set or get the parameters use the APIS setValue() and getXXX().
function.getImportParameterList().setValue("REQUTEXT", "Hello SAP");
try {
// execute, i.e. send the function to the ABAP system addressed
// by the specified destination, which then returns the function result.
// All necessary conversions between Java and ABAP data types
// are done automatically.
function.execute(destination);
} catch (AbapException e) {
System.out.println(e.toString());
return;
}
System.out.println("STFC_CONNECTION finished:");
System.out.println(" Echo: " + function.getExportParameterList().getString("ECHOTEXT"));
System.out.println(" Response: " + function.getExportParameterList().getString("RESPTEXT"));
System.out.println();
}
/**
* This example demonstrates the destination concept introduced with JCO 3. The application does
* not deal with single connections anymore. Instead it works with logical destinations like
* ABAP_AS and ABAP_MS which separates the application logic from technical configuration.
*
* @throws com.sap.conn.jco.JCoException
*/
public static void step1Connect() throws JCoException {
JCoDestination destination = JCoDestinationManager.getDestination(ABAP_AS);
System.out.println("Attributes:");
System.out.println(destination.getAttributes());
System.out.println();
destination = JCoDestinationManager.getDestination(ABAP_MS);
System.out.println("Attributes:");
System.out.println(destination.getAttributes());
System.out.println();
}
/**
* Default constructor.
*
* @param destination the RFC destination to use to obtain the table structure and contents
* @param tableName the name of the database table
* @throws JCoException
*/
public TableReader(JCoDestination destination, String tableName) throws JCoException {
super();
this.destination = destination;
this.tableName = tableName;
this.template =
destination.getRepository().getFunctionTemplate("RFC_READ_TABLE"); // $NON-NLS-1$
loadStructure();
}
/**
* this example shows the "simple" stateful call sequence. Since all calls belonging to one
* session are executed within the same thread, the application does not need to take into account
* the SessionReferenceProvider. MultithreadedExample.java illustrates the more complex scenario,
* where the calls belonging to one session are executed in different threads.
*
* <p>Note: this example uses Z_GET_COUNTER and Z_INCREMENT_COUNTER. Most ABAP systems contain
* function modules GET_COUNTER and INCREMENT_COUNTER that are not remote-enabled. Copy these
* functions to Z_GET_COUNTER and Z_INCREMENT_COUNTER (or implement as wrapper) and declare them
* to be remote enabled.
*
* @throws com.sap.conn.jco.JCoException
*/
public static void step4SimpleStatefulCalls() throws JCoException {
final JCoFunctionTemplate incrementCounterTemplate, getCounterTemplate;
JCoDestination destination = JCoDestinationManager.getDestination(ABAP_MS);
incrementCounterTemplate =
destination.getRepository().getFunctionTemplate("Z_INCREMENT_COUNTER");
getCounterTemplate = destination.getRepository().getFunctionTemplate("Z_GET_COUNTER");
if (incrementCounterTemplate == null || getCounterTemplate == null)
throw new RuntimeException(
"This example cannot run without Z_INCREMENT_COUNTER and Z_GET_COUNTER functions");
final int threadCount = 5;
final int loops = 5;
final CountDownLatch startSignal = new CountDownLatch(threadCount);
final CountDownLatch doneSignal = new CountDownLatch(threadCount);
Runnable worker =
new Runnable() {
public void run() {
startSignal.countDown();
try {
// wait for other threads
startSignal.await();
JCoDestination dest = JCoDestinationManager.getDestination(ABAP_MS);
JCoContext.begin(dest);
try {
for (int i = 0; i < loops; i++) {
JCoFunction incrementCounter = incrementCounterTemplate.getFunction();
incrementCounter.execute(dest);
}
JCoFunction getCounter = getCounterTemplate.getFunction();
getCounter.execute(dest);
int remoteCounter = getCounter.getExportParameterList().getInt("GET_VALUE");
System.out.println(
"Thread-"
+ Thread.currentThread().getId()
+ " finished. Remote counter has "
+ (loops == remoteCounter ? "correct" : "wrong")
+ " value ["
+ remoteCounter
+ "]");
} finally {
JCoContext.end(dest);
}
} catch (Exception e) {
System.out.println(
"Thread-"
+ Thread.currentThread().getId()
+ " ends with exception "
+ e.toString());
}
doneSignal.countDown();
}
};
for (int i = 0; i < threadCount; i++) {
new Thread(worker).start();
}
try {
doneSignal.await();
} catch (Exception e) {
}
}
/**
* A slightly more complex example than before. Query the companies list returned in a table and
* then obtain more details for each company.
*
* @throws com.sap.conn.jco.JCoException
*/
public static void step4WorkWithTable() throws JCoException {
JCoDestination destination = JCoDestinationManager.getDestination(ABAP_AS_POOLED);
JCoFunction function = destination.getRepository().getFunction("BAPI_COMPANYCODE_GETLIST");
if (function == null) throw new RuntimeException("BAPI_COMPANYCODE_GETLIST not found in SAP.");
try {
function.execute(destination);
} catch (AbapException e) {
System.out.println(e.toString());
return;
}
JCoStructure returnStructure = function.getExportParameterList().getStructure("RETURN");
if (!(returnStructure.getString("TYPE").equals("")
|| returnStructure.getString("TYPE").equals("S"))) {
throw new RuntimeException(returnStructure.getString("MESSAGE"));
}
JCoTable codes = function.getTableParameterList().getTable("COMPANYCODE_LIST");
for (int i = 0; i < codes.getNumRows(); i++) {
codes.setRow(i);
System.out.println(codes.getString("COMP_CODE") + '\t' + codes.getString("COMP_NAME"));
}
// move the table cursor to first row
codes.firstRow();
for (int i = 0; i < codes.getNumRows(); i++, codes.nextRow()) {
function = destination.getRepository().getFunction("BAPI_COMPANYCODE_GETDETAIL");
if (function == null)
throw new RuntimeException("BAPI_COMPANYCODE_GETDETAIL not found in SAP.");
function.getImportParameterList().setValue("COMPANYCODEID", codes.getString("COMP_CODE"));
// We do not need the addresses, so set the corresponding parameter to inactive.
// Inactive parameters will be either not generated or at least converted.
function.getExportParameterList().setActive("COMPANYCODE_ADDRESS", false);
try {
function.execute(destination);
} catch (AbapException e) {
System.out.println(e.toString());
return;
}
returnStructure = function.getExportParameterList().getStructure("RETURN");
if (!(returnStructure.getString("TYPE").equals("")
|| returnStructure.getString("TYPE").equals("S")
|| returnStructure.getString("TYPE").equals("W"))) {
throw new RuntimeException(returnStructure.getString("MESSAGE"));
}
JCoStructure detail = function.getExportParameterList().getStructure("COMPANYCODE_DETAIL");
System.out.println(
detail.getString("COMP_CODE")
+ '\t'
+ detail.getString("COUNTRY")
+ '\t'
+ detail.getString("CITY"));
} // for
}
public void run(ProcedureRunner runner) throws Exception {
CompositeMap context = runner.getContext();
logger = LoggingContext.getLogger(context, LOGGING_TOPIC);
logger.config("jco-invoke");
logger.config("===================================");
logger.log(Level.CONFIG, "config:{0}", new Object[] {this});
ServiceInstance service = (ServiceInstance) ServiceInstance.getInstance(context.getRoot());
// HttpServiceInstance service = (HttpServiceInstance) HttpServiceInstance
// .getInstance(context.getRoot());
CompositeMap target = null;
CompositeMap model = null;
if (service != null) model = service.getServiceContext().getModel();
else model = context.getRoot().getChild("model");
if (model == null) model = context.getRoot().createChild("model");
if (return_target != null) {
String t = TextParser.parse(return_target, context);
target = (CompositeMap) model.getObject(t);
if (target == null) target = model.createChildByTag(t);
}
JCoDestination destination = sapConfig.getJCoDestination(sid);
String functionName = function;
JCoFunctionTemplate ftemplate = destination.getRepository().getFunctionTemplate(functionName);
logger.info("function template:" + functionName);
if (ftemplate == null) {
logger.log(Level.SEVERE, "Function '" + function + "' not found in SAP system.");
throw new IllegalArgumentException("Function '" + function + "' not found in SAP system.");
}
// Create a function from the template
JCoFunction function = ftemplate.getFunction();
JCoParameterList input = function.getImportParameterList();
JCoParameterList output = function.getExportParameterList();
if (parameters != null)
for (int i = 0; i < parameters.length; i++) {
Parameter param = parameters[i];
if (param.Return_field == null) {
Object o =
param.Source_field == null ? param.Value : context.getObject(param.Source_field);
String value = o == null ? "" : o.toString();
input.setValue(param.Name, value);
logger.log(Level.CONFIG, "parameter {0} -> {1}", new Object[] {param.Name, value});
}
}
if (structures != null) {
for (int i = 0; i < structures.length; i++) {
Structure structure = structures[i];
structure.setLogger(logger);
if (structure.isImport()) {
JCoStructure stc = structure.getJCOStructure(input);
structure.fillJCOStructure(stc, context);
input.setValue(structure.Name, stc);
}
}
}
// Set import table
if (tables != null) {
JCoParameterList list = function.getTableParameterList();
for (int i = 0; i < tables.length; i++) {
Table table = tables[i];
table.setLogger(logger);
if (table.isImport()) {
JCoTable tbl = table.getJCOTable(list);
Object o = context.getObject(table.Source_field);
logger.config(
"transfer import table " + table.Name + " from '" + table.Source_field + "':" + o);
if (o instanceof CompositeMap) table.fillJCOTable(tbl, (CompositeMap) context);
}
}
}
// Call the remote system and retrieve return value
logger.config("call function " + function);
function.execute(destination);
if (parameters != null) {
for (int i = 0; i < parameters.length; i++) {
Parameter param = parameters[i];
if (param.Return_field != null) {
if (target == null)
throw new ConfigurationError(
"<jco-invoke>:must set 'return_target' attribute if there is return field");
String vl = output.getString(param.Name);
if (vl == null && !param.Nullable)
throw new IllegalArgumentException(
"jco-invoke: return field " + param.Name + " is null");
String f = TextParser.parse(param.Return_field, context);
target.putObject(f, vl);
logger.config("return: " + param.Name + "=" + vl + " -> " + f);
}
}
}
if (structures != null) {
for (int i = 0; i < structures.length; i++) {
Structure structure = structures[i];
structure.setLogger(logger);
if (structure.isImport()) continue;
if (structure.Target == null)
throw new ConfigurationError(
"Must set 'target' attribute for Structures " + structure.Name);
JCoStructure stc = structure.getJCOStructure(output);
CompositeMap result = (CompositeMap) context.getObject(structure.Target);
if (result == null) result = context.createChildByTag(structure.Target);
structure.fillCompositeMap(stc, result);
}
}
// Get export tables
if (tables != null) {
JCoParameterList list = function.getTableParameterList();
if (list == null)
throw new IllegalArgumentException("Function '" + function + "' doesn't return tables");
for (int i = 0; i < tables.length; i++) {
Table table = tables[i];
if (table.isImport()) continue;
if (table.Target == null)
throw new ConfigurationError("Must set 'target' attribute for table " + table.Name);
table.setLogger(logger);
JCoTable records = table.getJCOTable(list);
// Fetch as CompositeMap
CompositeMap result = (CompositeMap) context.getObject(table.Target);
if (result == null) result = context.createChildByTag(table.Target);
table.fillCompositeMap(records, result);
int rc = 0;
if (result.getChilds() != null) rc = result.getChilds().size();
logger.config(
"loading export table "
+ table.Name
+ " into path '"
+ table.Target
+ "', total "
+ rc
+ " record(s)");
}
}
}
