MVC: Tell a controller class which controller called it

I have to controller pages (page1.do and page2.do) that both shall use the same controller class (CL_CTR).
Can I tell in DO_REQUEST of the controller class whether page1.do or page2.do called the controller class?

Hi Daniel,
To call page1(2).do's from do_request you first put the following in DO_INIT.
data: page1details type ref to cl_bsp_controller2.
page1details ?= create_controller( controller_name = 'page1details.do'
controller_id = 'subcntlr1_id' ).
similarly you should do the same for page2.
Then in DO_REQUEST.
data: subcontroller1 type ref to cl_bsp_controller2.
subcontroller1 ?= get_controller( controller_id = 'subcntlr1_id' ).
call_controller( subcontroller1 ).
I hope this helps.
If it doesn't work let me know.
Regards
Amit
Message was edited by: amit kumar

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6 different interfaces. There will be 1 controller
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4.) In the light of the (3.) above, I suspect that any failures in Request delegation, or Command execution, should be perhaps propagated back to a FrontController by exceptions only, since, say, a WebFrontController might want to show a click-through error page, when a SwingFrontController might prefer to show an error dialog box, a LogicalErrorViewEnumeration might not make sense at all in the context of a particular Client, for example a queueing Client.
5.) In the light of the (4.) above, there is the question of an appropriate Request interface (into an ApplicationController), an appropriate Response interface (back into a FrontController), as well as an appropriate ViewArguments interface (into a FrontController and later into a View). The problem with generic Requests is that they can be created with nonsensical argument combinations, so shouldn't Requests be abstract and force proper arguments in concrete subclasses, through explicit constructors (in a sense, degenerate Commands)? The problem with Responses and ViewArguments is that... well, I have not found any formal discussion anywhere as to what those should look like. In most samples I have encountered, Responses include Client-specific implementation details, as mentioned in (2.), above.
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7.) Some CCS discussions seem to include an extra Request argument that specifies an ApplicationController to use (Request.Action="create", Request.Controller="account", Request.Username="me-me-me"), instead of using a Router inside of a FrontController to resolve to a particular ApplicationController through a generic action (Request.Action="createAccount", Request.Username="me-me-me"). I am not sure about the reason for such a design decision: why should a Client or a FrontController be allowed to concern itself with an implementation-level structure of the framework? Wouldn't any framework state -dependent ApplicationController resolution issues be best handled inside a Router, used by a FrontController to resolve [obtain] an appropriate ApplicationController, thus preventing Clients from ever forcing the framework into a possibly inconsistent behavior?
Any comments appreciated...
Thanks,
Gary

gniemcew wrote:
1.) Some CCS discussions seem to assign View presentation (sometimes called "dispatch", or "rendering", or "forwarding"?) to an ApplicationController. It seems puzzling to me, since only a concrete FrontController should include any knowledge of a concrete View structure. Shouldn't only a FrontController perform a logical-to-physical resource mapping, thus encapsulating knowledge whether a particular View is a separate, stand-alone Web page or a compound, argument-driven Swing object, and how to "present it" (by either redirecting to a Web page, or bringing a particular Swing object into the foreground)?It is hard to tell without reading the actual discussion, but my guess is that the posters were either conflating or being loose with the distinction between a FrontController and an ApplicationController. The former is (normally) intimately tied to the actual view being used (HTTP, Swing, etc.) whereas the ApplicationController typically is not. Both are involved in dispatch and event processing. The former normally renders a view whereas the latter does not.
gniemcew wrote:
2.) Some CCS discussions seem to introduce Client-specific implementation details at the ApplicationController level, for example "HTTP requests" or "HTTP responses". It seems puzzling to me, since I feel that every part of the framework, except for a concrete FrontController, should be completely independent of the nature of a Client making a request. Instead, I created a generic Request object w/arguments and have a concrete FrontController translate any client-specific details into such a generic Request, before delegating to an ApplicationController.Generic is fine. However, you can become generic to the point where your Request and Response interfaces are only acting as "marker" interfaces (think of java.io.Serializable). Writing a truly generic controller is possible, but personally, I have never found the effort justified.
gniemcew wrote:
3.) In the light of the (2.) above, I am not sure what constitutes a "response" from an ApplicationController back to a FrontController. It seems to me that the only universal "response" is a LogicalViewEnumeration: what View to present once a command has been completed, in many cases a "don't care", or a "show the requestor", or a "show a home page" (not every request has to result in changing a View). Well, perhaps a LogicalViewEnumeration as well as possible View arguments (?).A given service (if you ascribe to SOA) should be the fundamental unit in your architectural design. A good application controller would be responsible for determining how to dispatch a given Command. Whether a Command pattern is used or whether service methods are invoked directly from your FrontController, the ApplicationController should enforce common service aspects. These include authentication, authorization, auditing, orchestration, validation, logging, error handling, just to name a few.
The ApplicationController should ideally offload these aspects from a given service. The service would indicate how the aspects are to be applied (e.g., strong authentication required, x role required, fetching of existing process state, etc.) This allows services to be developed more quickly and to have these critical aforementioned aspects developed and tested centrally.
Your FrontController, in contrast, is responsible for transforming whatever input it is designed to receive (HTTP form data posts, XML-RPC, etc.) and ensure that it honors the contract(s) that the ApplicationController establishes. There are no cut-and-dry decisions though about when a given piece of functionality should be ApplicationController or FrontController. Take error handling. Should I emit just a generic ServiceException or allow the FrontController to decide what to do with a more concrete checked exception? (The FrontController, in any case, should present the error to the user in a manner dictated by the protocol it serves).
gniemcew wrote:
4.) In the light of the (3.) above, I suspect that any failures in Request delegation, or Command execution, should be perhaps propagated back to a FrontController by exceptions only, since, say, a WebFrontController might want to show a click-through error page, when a SwingFrontController might prefer to show an error dialog box, a LogicalErrorViewEnumeration might not make sense at all in the context of a particular Client, for example a queueing Client.See above. Yes. However, the ApplicationController could easily 'hide' details about the failure. For example, any number of exceptions being mapped to a generic DataAccessException or even more abstractly to a ServiceFailureException. The ApplicationController could indicate whether the failure was recoverable and/or populate information necessary to speed up production support (e.g., mapping exceptions to error codes and/or providing a primary key in an error audit log table for support to reference). A given FrontController would present that information to the user in the method that makes sense (e.g., error dialog for Swing, error page for HTML, etc.)
gniemcew wrote:
5.) In the light of the (4.) above, there is the question of an appropriate Request interface (into an ApplicationController), an appropriate Response interface (back into a FrontController), as well as an appropriate ViewArguments interface (into a FrontController and later into a View). The problem with generic Requests is that they can be created with nonsensical argument combinations, so shouldn't Requests be abstract and force proper arguments in concrete subclasses, through explicit constructors (in a sense, degenerate Commands)? The problem with Responses and ViewArguments is that... well, I have not found any formal discussion anywhere as to what those should look like. In most samples I have encountered, Responses include Client-specific implementation details, as mentioned in (2.), above.See comment on marker interfaces above. Nothing, however, stops you from requiring a certain sub-type in a given service method. You can still pass in the interface and validate the proper type by an assert statement (after all, in the vast majority of situations, the proper service method should get the proper instance of a given Request object). IMO, the FrontController would create the Command instance which would be passed to the ApplicationController which would dispatch and invoke the proper service method. A model response would be received by the FrontController which would then render the appropriate view.
gniemcew wrote:
6.) Some CCS discussions seem to introduce a Flow Manager at the ApplicationController level. It seems puzzling to me, since the whole point of the Command and Controller Strategy flavor seems to be centralization of business logic execution within self-contained Command objects. Shouldn't Requests get associated with Handlers (objects capable of actually carrying out Requests) and transformed into Commands inside an ApplicationController, thus Commands themselves return appropriate LogicalViewEnumeration back to an ApplicationController, back to a FrontController? Let's consider a ShowMyShippingAddress request coming into the framework: unless such a Request is eventually treated as a Command returning a particular LogicalViewEnumeration, it is suddenly a Flow Manager "acting" as a business logic driver. I guess the question here is: except for a few special cases handled by a particular ApplicationController (authentication, error conditions, default behavior, etc.), should flow management be considered stand-alone, or always delegated to Commands?There are distinct kinds of flow management. For example, orchestration (or BPM) is properly at either the service or ApplicationController layers. However, determining which view to display is properly at the FrontController layer. The ApplicationController should receive a Command (with a populate Request) and return that Command (with a populated Response). Both the Request and Response are fundamentally model classes (within MVC). The FrontController is responsible for populating the Request and/or Command and rendering the Response and/or Command. Generic error handling is usually centralized for both controllers.
gniemcew wrote:
7.) Some CCS discussions seem to include an extra Request argument that specifies an ApplicationController to use (Request.Action="create", Request.Controller="account", Request.Username="me-me-me"), instead of using a Router inside of a FrontController to resolve to a particular ApplicationController through a generic action (Request.Action="createAccount", Request.Username="me-me-me"). I am not sure about the reason for such a design decision: why should a Client or a FrontController be allowed to concern itself with an implementation-level structure of the framework? Wouldn't any framework state -dependent ApplicationController resolution issues be best handled inside a Router, used by a FrontController to resolve [obtain] an appropriate ApplicationController, thus preventing Clients from ever forcing the framework into a possibly inconsistent behavior?I am not 100% sure of what you are getting at here. However, it seems to be the method by which commands are dispatched. They are in effect allowing a FrontController to dictate which of n ApplicationControllers should receive the request. If we allow a FrontController to directly invoke a service method, then the ApplicationController is simply a centralized framework that should always be invoked for each service method (enforced via AOP or some other mechanism). If there is a single, concrete ApplicationController which handles dispatch, then all FrontControllers communicate directly with that instance. It is really just a design decision (probably based on your comfort level with concepts like AOP that allow the ApplicationController to exist solely behind the scenes).
I might have totally missed your questions, but those are my thoughts on a Monday. Best of luck.
- Saish

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Hello
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Edited by: 875864 on 30-Oct-2011 15:05

875864 wrote:
Hello
This is for the experts.
What is the best approach to passing a large set of data from Class A to Class B? I have a DAO Class that connects to a database to retrieve data. I tried saving the data in a collection (map) and passing the collection to Class B. The problem here is that the data is may be too large for a collection without increasing the heap size, it could cause out of memory exception. Instead I'd like to pass the data (row by row) on to the "Controller" Class where which will process each row. I am not sure how to do this without using a collection or some sort. Some tips will be much appreciated.
Note: MVC Rules dictates that Controller cannot call the DAO Class directly, it has to go through the Model which talks directly with the DAO Class.
Thanks
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Hi
Could anyone help out with the following:-
I 'inherited' a customer's Web IC implementation to support recently. The system hasn't been properly documented, I'm new to Web IC and they've just applied support packages to the system which has caused some problems.
The specific issue is as follows:-
I search for, identify and confirm a business partner.
I call up view IHistResult (via Interaction History from the NavBar) - this was copied from the standard CRM_IC application and has a Z controller associated with it. There is an XML controller replacement in place to call this view.
When the view is called, I get a syntax error - CX_SY_MOVE_CAST_ERROR. The cast that occurs is from a variable referencing CL_BSP_CONTROLLER to my Z class - which does have a relationship to CL_BSP_CONTROLLER through super classes.
If I make the controller class the SAP standard class (CL_CRM_IC_IHISTRESULT_IMPL) then everything is fine. I created a new, clean Z class with CL_CRM_IC_IHISTRESULT_IMPL as the super class, no redefinitions, no changes and assigned this to the view. Then I get the syntax error in the view.
I don't see what the problem with casting to my Z class can be - it's a subclass of CL_CRM_IC_IHISTRESULT_IMPL with absolutely no changes.
If anyone could suggest any ideas or solutions I'd be grateful.
Thanks
Ben

Found my own solution to this one. Hadn't updated the .do file - only the .htm.
Sorry for any time wasted.

Controller Class: Search functionality.

Hello,
Here is a snapshot of the Controller class what NetBeans have created by default which interacts with the entity class. I need to add a search functionality to this bean which a JSF search form can utilize. Can anyone help me out to add without breaking it's structure.
public class ProductController {
    private Product product = null;
    private List<Product> products = null;
    @Resource
    private UserTransaction utx = null;
    @PersistenceUnit(unitName = "ExApp")
    private EntityManagerFactory emf = null;
    public EntityManager getEntityManager() {
        return emf.createEntityManager();
    public int batchSize = 15;
    private int firstItem = 0;
    private int itemCount = -1;
    public SelectItem[] getProductsAvailableSelectMany() {
        return getProductsAvailable(false);
    public SelectItem[] getProductsAvailableSelectOne() {
        return getProductsAvailable(true);
    private SelectItem[] getProductsAvailable(boolean one) {
        List<Product> allProducts = getProducts(true);
        int size = one ? allProducts.size() + 1 : allProducts.size();
        SelectItem[] items = new SelectItem[size];
        int i = 0;
        if (one) {
            items[0] = new SelectItem("", "---");
            i++;
        for (Product x : allProducts) {
            items[i++] = new SelectItem(x, x.toString());
        return items;
    public Product getProduct() {
        if (product == null) {
            product = getProductFromRequest();
        if (product == null) {
            product = new Product();
        return product;
    public String listSetup() {
        reset(true);
        return "product_list";
    public String createSetup() {
        reset(false);
        product = new Product();
        return "product_create";
    public String searchSetup() {
        reset(false);
        product = new Product();
        return "product_search";
    public String create() {
        EntityManager em = getEntityManager();
        try {
            utx.begin();
            em.persist(product);
            utx.commit();
            addSuccessMessage("Product was successfully created.");
        } catch (Exception ex) {
            try {
                if (findProduct(product.getId()) != null) {
                    addErrorMessage("Product " + product + " already exists.");
                } else {
                    ensureAddErrorMessage(ex, "A persistence error occurred.");
                utx.rollback();
            } catch (Exception e) {
                ensureAddErrorMessage(e, "An error occurred attempting to roll back the transaction.");
            return null;
        } finally {
            em.close();
        return listSetup();
    public String detailSetup() {
        return scalarSetup("product_detail");
    public String editSetup() {
        return scalarSetup("product_edit");
    private String scalarSetup(String destination) {
        reset(false);
        product = getProductFromRequest();
        if (product == null) {
            String requestProductString = getRequestParameter("jsfcrud.currentProduct");
            addErrorMessage("The product with id " + requestProductString + " no longer exists.");
            String relatedControllerOutcome = relatedControllerOutcome();
            if (relatedControllerOutcome != null) {
                return relatedControllerOutcome;
            return listSetup();
        return destination;
private Product getProductFromRequest() {
        String theId = getRequestParameter("jsfcrud.currentProduct");
        return (Product) new ProductConverter().getAsObject(FacesContext.getCurrentInstance(), null, theId);
    private String getRequestParameter(String key) {
        return FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get(key);
    public List<Product> getProducts() {
        if (products == null) {
            products = getProducts(false);
        return products;
    public List<Product> getProducts(boolean all) {
        EntityManager em = getEntityManager();
        try {
            Query q = em.createQuery("select object(o) from Product as o");
            if (!all) {
                q.setMaxResults(batchSize);
                q.setFirstResult(getFirstItem());
            return q.getResultList();
        } finally {
            em.close();
    private void ensureAddErrorMessage(Exception ex, String defaultMsg) {
        String msg = ex.getLocalizedMessage();
        if (msg != null && msg.length() > 0) {
            addErrorMessage(msg);
        } else {
            addErrorMessage(defaultMsg);
    public static void addErrorMessage(String msg) {
        FacesMessage facesMsg = new FacesMessage(FacesMessage.SEVERITY_ERROR, msg, msg);
        FacesContext.getCurrentInstance().addMessage(null, facesMsg);
    public static void addSuccessMessage(String msg) {
        FacesMessage facesMsg = new FacesMessage(FacesMessage.SEVERITY_INFO, msg, msg);
        FacesContext.getCurrentInstance().addMessage("successInfo", facesMsg);
    public Product findProduct(Integer id) {
        EntityManager em = getEntityManager();
        try {
            Product o = (Product) em.find(Product.class, id);
            return o;
        } finally {
            em.close();
    public int getItemCount() {
        if (itemCount == -1) {
            EntityManager em = getEntityManager();
            try {
                itemCount = ((Long) em.createQuery("select count(o) from Product as o").getSingleResult()).intValue();
            } finally {
                em.close();
        return itemCount;
    public int getFirstItem() {
        getItemCount();
        if (firstItem >= itemCount) {
            if (itemCount == 0) {
                firstItem = 0;
            } else {
                int zeroBasedItemCount = itemCount - 1;
                double pageDouble = zeroBasedItemCount / batchSize;
                int page = (int) Math.floor(pageDouble);
                firstItem = page * batchSize;
        return firstItem;
    public int getLastItem() {
        getFirstItem();
        return firstItem + batchSize > itemCount ? itemCount : firstItem + batchSize;
    public int getBatchSize() {
        return batchSize;
    public String next() {
        reset(false);
        getFirstItem();
        if (firstItem + batchSize < itemCount) {
            firstItem += batchSize;
        return "product_list";
    public String prev() {
        reset(false);
        getFirstItem();
        firstItem -= batchSize;
        if (firstItem < 0) {
            firstItem = 0;
        return "product_list";
    private String relatedControllerOutcome() {
        String relatedControllerString = getRequestParameter("jsfcrud.relatedController");
        String relatedControllerTypeString = getRequestParameter("jsfcrud.relatedControllerType");
        if (relatedControllerString != null && relatedControllerTypeString != null) {
            FacesContext context = FacesContext.getCurrentInstance();
            Object relatedController = context.getApplication().getELResolver().getValue(context.getELContext(), null, relatedControllerString);
            try {
                Class<?> relatedControllerType = Class.forName(relatedControllerTypeString);
                Method detailSetupMethod = relatedControllerType.getMethod("detailSetup");
                return (String) detailSetupMethod.invoke(relatedController);
            } catch (ClassNotFoundException e) {
                throw new FacesException(e);
            } catch (NoSuchMethodException e) {
                throw new FacesException(e);
            } catch (IllegalAccessException e) {
                throw new FacesException(e);
            } catch (InvocationTargetException e) {
                throw new FacesException(e);
        return null;
    private void reset(boolean resetFirstItem) {
        product = null;
        products = null;
        itemCount = -1;
        if (resetFirstItem) {
            firstItem = 0;
    private Map<Object, String> asString = null;
    public Map<Object, String> getAsString() {
        if (asString == null) {
            asString = new HashMap<Object, String>() {
                @Override
                public String get(Object key) {
                    if (key instanceof Object[]) {
                        Object[] keyAsArray = (Object[]) key;
                        if (keyAsArray.length == 0) {
                            return "(No Items)";
                        StringBuffer sb = new StringBuffer();
                        for (int i = 0; i < keyAsArray.length; i++) {
                            if (i > 0) {
                                sb.append("<br />");
                            sb.append(keyAsArray);
return sb.toString();
return new ProductConverter().getAsString(FacesContext.getCurrentInstance(), null, (Product) key);
return asString;
Thank you.

Can you tell us what "not working" means? Can you give us some more detail to try and narrow down the problem? Also you say the search works on your local machine. Have you tried running the help from the generated / published location yourself?

MVC: Tell a controller class which controller called it

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