I'm using the JCo Library to access SAP standard BAPI. Well everything is also working except that the RETURN Table is always empty when I use the TID (TransactionID).
When I just remove the TID, I get the RETURN table filled with Warnings etc. But unfortunately I need to use the TID for the transactional BAPI, otherwise the changes are not commited.
Why is the RETURN TABLE empty when using TID?
Or how must I commit changes to a transactional BAPI?
Here speudo-code of a BAPI access:
import com.sap.conn.jco.*;
import org.apache.commons.logging.*;
public class BapiSample {
private static final Log logger = LogFactory.getLog(BapiSample.class);
private static final String CLIENT = "400";
private static final String INSTITUTION = "1000";
protected JCoDestination destination;
public BapiSample() {
this.destination = getDestination("mySAPConfig.properties");
}
public void execute() {
String tid = null;
try {
tid = destination.createTID();
JCoFunction function = destination.getRepository().getFunction("BAPI_PATCASE_CHANGEOUTPATVISIT");
function.getImportParameterList().setValue("CLIENT", CLIENT);
function.getImportParameterList().setValue("INSTITUTION", INSTITUTION);
function.getImportParameterList().setValue("MOVEMNT_SEQNO", "0001");
// Here we will then all parameters of the BAPI....
// ...
// Now the execute
function.execute(destination, tid);
// And getting the RETURN Table. !!! THIS IS ALWAYS EMPTY!
JCoTable returnTable = function.getTableParameterList().getTable("RETURN");
int numRows = returnTable.getNumRows();
for (int i = 0; i < numRows; i++) {
returnTable.setRow(i);
logger.info("RETURN VALUE: " + returnTable.getString("MESSAGE"));
}
JCoFunction commit = destination.getRepository().getFunction("BAPI_TRANSACTION_COMMIT");
commit.execute(destination, tid);
destination.confirmTID(tid);
} catch (Throwable ex) {
try {
if (destination != null) {
JCoFunction rollback = destination.getRepository().getFunction("BAPI_TRANSACTION_ROLLBACK");
rollback.execute(destination, tid);
}
} catch (Throwable t1) {
}
}
}
protected static JCoDestination getDestination(String fileName) {
JCoDestination result = null;
try {
result = JCoDestinationManager.getDestination(fileName);
} catch (Exception ex) {
logger.error("Error during destination resolution", ex);
}
return result;
}
}
UPDATE 10.01.2013: I was finally able to get both, RETURN table filled and Inputs commited. Solution is to do just both, a commit without TID, get the RETURN table and then making again a commit with TID.
Very very strange, but maybe the correct usage of the JCo Commits. Can someone explain this to me?
I was able to get both, RETURN table filled and Inputs commited.
Solution is to do just both, a commit without TID, get the RETURN table and then making again a commit with TID.
You should not call execute method 2 times it will incremenmt sequence number
You should use begin and end method in JCoContext class.
If you call begin method at the beginning of the process, the data will be updated and message will be returned.
Here is the sample code.
JCoDestination destination = JCoDestinationManager.getDestination("");
try
{
JCoContext.begin(destination);
function.execute(destination)
function.execute(destination)
}
catch (AbapException ex)
{
...
}
catch (JCoException ex)
{
...
}
catch (Exception ex)
{
...
}
finally
{
JCoContext.end(destination);
}
you can reffer the further information from this URL.
http://www.finereporthelp.com/download/SAP/sapjco3_linux_32bit/javadoc/com/sap/conn/jco/JCoContext.html
Related
I'm trying to understand reactive style. But stuck on this example.
public class ScriptServiceImpl implements ScriptService{
private static Logger log = LoggerFactory.getLogger(ScriptServiceImpl.class);
private final ScriptEngineManager manager = new ScriptEngineManager();
private final ScriptEngine engine = manager.getEngineByName("JavaScript");
#Override
public Flux<MyFunctionResult> evaluate(MyFunction myFunction, Integer iterations){
Flux<MyFunctionResult> flux = Flux.empty();
flux.mergeWith(
Flux.range(1,iterations)
.map(counter -> {
engine.put("parametr", counter);
try {
long start = System.currentTimeMillis();
String functionResult = engine.eval(myFunction.getSource()).toString();
long timer = System.currentTimeMillis() - start;
return Mono.just(new MyFunctionResult(timer, functionResult, myFunction.getNumber(), counter));
} catch (ScriptException ex) {
return Mono.error(ex);
}
})
);
return flux;
}
}
I want to return Flux of MyFunctionResult but get Flux of Object in Flux.mergeWith section. What am i doing wrong?
There are multiple issues here
you don't need to wrap MyFunctionResult into Mono. map expects none-reactive return type. As result, instead of Mono.error you should just wrap checked exception into unchecked RuntimeException.
you need to return result of the flux.mergeWith and not flux. But in general for this example you don't need mergeWith
Your code could be converted into
return Flux.range(1,iterations)
.map(counter -> {
engine.put("parametr", counter);
try {
long start = System.currentTimeMillis();
String functionResult = engine.eval(myFunction.getSource()).toString();
long timer = System.currentTimeMillis() - start;
return new MyFunctionResult(timer, functionResult, myFunction.getNumber(), counter);
} catch (ScriptException ex) {
throw Exceptions.propagate(ex);
}
});
In addition, not sure about engine.eval but in case this is blocking code consider wrapping it and run on a separate scheduler How Do I Wrap a Synchronous, Blocking Call?
I want to fetch records for newly created records in a table in postgresql as a live/continuous stream. Is it possible to use using spring r2dbc? If so what options do I have?
Thanks
You need to use pg_notify and start to listing on it. Any change that you want to see should be wrapped in simple trigger that will send message to pg_notify.
I have an example of this on my github, but long story short:
prepare function and trigger:
CREATE OR REPLACE FUNCTION notify_member_saved()
RETURNS TRIGGER
AS $$
BEGIN
PERFORM pg_notify('MEMBER_SAVED', row_to_json(NEW)::text);
RETURN NULL;
END;
$$ LANGUAGE plpgsql;
CREATE TRIGGER member_saved_trigger
AFTER INSERT OR UPDATE
ON members
FOR EACH ROW
EXECUTE PROCEDURE notify_member_saved();
In java code prepare listener
#Service
#RequiredArgsConstructor
#Slf4j
class NotificationService {
private final ConnectionFactory connectionFactory;
private final Set<NotificationTopic> watchedTopics = Collections.synchronizedSet(new HashSet<>());
#Qualifier("postgres-event-mapper")
private final ObjectMapper objectMapper;
private PostgresqlConnection connection;
#PreDestroy
private void preDestroy() {
this.getConnection().close().subscribe();
}
private PostgresqlConnection getConnection() {
if(connection == null) {
synchronized(NotificationService.class) {
if(connection == null) {
try {
connection = Mono.from(connectionFactory.create())
.cast(Wrapped.class)
.map(Wrapped::unwrap)
.cast(PostgresqlConnection.class)
.toFuture().get();
} catch(InterruptedException e) {
throw new RuntimeException(e);
} catch(ExecutionException e) {
throw new RuntimeException(e);
}
}
}
}
return this.connection;
}
public <T> Flux<T> listen(final NotificationTopic topic, final Class<T> clazz) {
if(!watchedTopics.contains(topic)) {
executeListenStatement(topic);
}
return getConnection().getNotifications()
.log("notifications")
.filter(notification -> topic.name().equals(notification.getName()) && notification.getParameter() != null)
.handle((notification, sink) -> {
final String json = notification.getParameter();
if(!StringUtils.isBlank(json)) {
try {
sink.next(objectMapper.readValue(json, clazz));
} catch(JsonProcessingException e) {
log.error(String.format("Problem deserializing an instance of [%s] " +
"with the following json: %s ", clazz.getSimpleName(), json), e);
Mono.error(new DeserializationException(topic, e));
}
}
});
}
private void executeListenStatement(final NotificationTopic topic) {
getConnection().createStatement(String.format("LISTEN \"%s\"", topic)).execute()
.doOnComplete(() -> watchedTopics.add(topic))
.subscribe();
}
public void unlisten(final NotificationTopic topic) {
if(watchedTopics.contains(topic)) {
executeUnlistenStatement(topic);
}
}
private void executeUnlistenStatement(final NotificationTopic topic) {
getConnection().createStatement(String.format("UNLISTEN \"%s\"", topic)).execute()
.doOnComplete(() -> watchedTopics.remove(topic))
.subscribe();
}
}
start listiong from controller
#GetMapping("/events")
public Flux<ServerSentEvent<Object>> listenToEvents() {
return Flux.merge(listenToDeletedItems(), listenToSavedItems())
.map(o -> ServerSentEvent.builder()
.retry(Duration.ofSeconds(4L))
.event(o.getClass().getName())
.data(o).build()
);
}
#GetMapping("/unevents")
public Mono<ResponseEntity<Void>> unlistenToEvents() {
unlistenToDeletedItems();
unlistenToSavedItems();
return Mono.just(
ResponseEntity
.status(HttpStatus.I_AM_A_TEAPOT)
.body(null)
);
}
private Flux<Member> listenToSavedItems() {
return this.notificationService.listen(MEMBER_SAVED, Member.class);
}
private void unlistenToSavedItems() {
this.notificationService.unlisten(MEMBER_SAVED);
}
but remember that if something broke then you lost pg_notify events for some time so it is for non-mission-citical solutions.
I'm trying to write a function to check whether a table exists or not in BigQuery. The following code always returns true. Where is the problem?
Thanks!
private static boolean checkTableExist() {
try {
BigQueryOptions.Builder optionsBuilder = BigQueryOptions.newBuilder();
BigQuery bigquery = optionsBuilder.build().getService();
bigquery.getTable(options.getBigQueryDatasetId(), options.getBigQueryTableId());
} catch (Exception e) {
return false;
}
return true;
}
I don't think you should rely on java Exception to test a boolean condition.
I haven't looked a lot at the getTable() method, but here is how I check if a table exists:
public boolean isExisting() {
return getDataset().get(tableName) != null;
}
protected Dataset getDataset() {
return bigQuery.getDataset(dataSetName);
}
Try this:
if (bigquery.getDataset(datasetName).get(tableName).exists()) {
// table exists
} else {
// table does not exist in BQ dataset
}
I need to create a folder when it doesn't exist. In my case, the only way to do so is to capture the error and handle it to create the folder wanted.
But all i can find is
public static Observable<Boolean> folderExists(final Context context, final String targetPath, final String currentpath) {
Application application = Application.get(context);
//i browse the folder to get all the items
return browseFolderObservable(context,currentpath)
.subscribeOn(application.defaultSubscribeScheduler())
.doOnError(new Action1<Throwable>() {
#Override
public void call(Throwable throwable) {
BsSdkLog.d("Error no file found");
}
})
.map(new Func1<ArrayList<Item>, Boolean>() {
#Override
public Boolean call(ArrayList<Item> items) {
if(items.isEmpty()) {
BsSdkLog.d(" No items");
return false;
}else {
for(int i=0;i<items.size();i++)
{
Item item=items.get(i);
BsSdkLog.d(item.toString());
}
BsSdkLog.d("Right-here");
return true;
}
}
});
}
I want to call the method that i have that creates the folder when the error occurs but i don't know how to do that.
I'm new to this so i'd really appreciate the help
Thanks
The basic principe looks like this. I used the Java NIO library for testing.
The method 'createFolder' just wraps creating a folder. The test 'name' invokes the Single and checks for an Exception. If it is an IOException it will return a fallback value. You may do something different in there. You just provide a fallback single. If it is an error different from IOException, it will return the error.
#Test
void name() throws Exception {
final String TO_CREATE = "/home/sergej/Downloads/Wurstbrot";
this.createFolder(TO_CREATE)
.onErrorResumeNext(throwable -> { // handle Exception:
// Validate Exception
if (throwable instanceof IOException) {
// Return fallback
return Single.just(Paths.get("/home/sergej/Downloads/"));
}
return Single.error(throwable);
})
.test()
.await()
.assertValueCount(1)
.assertValue(path -> path.endsWith(TO_CREATE))
.assertNoErrors();
}
private Single<Path> createFolder(String p) {
return Single.defer(() -> { // may throw some IOException
Path path = Paths.get(p);
if (!Files.exists(path)) {
Path createdDirectory = Files.createDirectory(path); // will throw if already exists
return Single.just(createdDirectory);
}
// Or just return Path, because it already exists???
return Single.error(new IOException("Already exists"));
});
}
This is the way I am looking to process my data.. from pig..
A = Load 'data' ...
B = FOREACH A GENERATE my.udfs.extract(*);
or
B = FOREACH A GENERATE my.udfs.extract('flag');
So basically extract either has no arguments or takes an argument... 'flag'
On my udf side...
#Override
public DataBag exec(Tuple input) throws IOException {
//if flag == true
//do this
//else
// do that
}
Now how do i implement this in pig?
The preferred way is to use DEFINE.
,,Use DEFINE to specify a UDF function when:
...
The constructor for the
function takes string parameters. If you need to use different
constructor parameters for different calls to the function you will
need to create multiple defines – one for each parameter set"
E.g:
Given the following UDF:
public class Extract extends EvalFunc<String> {
private boolean flag;
public Extract(String flag) {
//Note that a boolean param cannot be passed from script/grunt
//therefore pass it as a string
this.flag = Boolean.valueOf(flag);
}
public Extract() {
}
public String exec(Tuple input) throws IOException {
if (input == null || input.size() == 0) {
return null;
}
try {
if (flag) {
...
}
else {
...
}
}
catch (Exception e) {
throw new IOException("Caught exception processing input row ", e);
}
}
}
Then
define ex_arg my.udfs.Extract('true');
define ex my.udfs.Extract();
...
B = foreach A generate ex_arg(); --calls extract with flag set to true
C = foreach A generate ex(); --calls extract without any flag set
Another option (hack?) :
In this case the UDF gets instantiated with its noarg constructor and you pass the flag you want to evaluate in its exec method. Since this method takes a tuple as a parameter you need to first check whether the first field is the boolean flag.
public class Extract extends EvalFunc<String> {
public String exec(Tuple input) throws IOException {
if (input == null || input.size() == 0) {
return null;
}
try {
boolean flag = false;
if (input.getType(0) == DataType.BOOLEAN) {
flag = (Boolean) input.get(0);
}
//process rest of the fields in the tuple
if (flag) {
...
}
else {
...
}
}
catch (Exception e) {
throw new IOException("Caught exception processing input row ", e);
}
}
}
Then
...
B = foreach A generate Extract2(true,*); --use flag
C = foreach A generate Extract2();
I'd rather stick to the first solution as this smells.