Examples of org.zkoss.zk.ui.Page

org.zkoss.zk.ui.Page
A page. A desktop consists of a set of pages.
When a ZK request is asking to render a new page, a new page is created and components that are created duing this request all belong to this page.
If a ZK requst is asking an update, it must have at lease one UUID of a component ( {@link Component#getUuid}. From this UUID, we know which page it belongs and activate it to process the update.
By activation, the system guarantees no concurrent access to pages and components (so you don't need use synchronized for them).
Desktop

In portal and some environments, a client request (e.g., ServletRequest) might consists of several ZK requests ( {@link org.zkoss.zk.au.AuRequest}). While each ZK request might ask to create an independent page, all these pages are grouped as a desktop, such that they are activated and removed at the same time. Moreover, pages in the same desktop could communicate to eath other (see Inter-page communication).
A session, {@link Session}, might have multiple desktops of pages, {@link Page}, while a page belongs to exactly one session. A page, {@link Page}, might have many components, {@link Component}, while a component belongs to exactly one page.
All components of the same desktop of pages are removed at the same time if a page become 'obsolete'.
During each execution (${link Execution}), exactly one desktop of pages are locked (aka., activated). Though an execution serves a client request (e.g., ServletRequest), a client request might consist of multiple ZK request ( {@link org.zkoss.zk.au.AuRequest}). Each ZK request might target to a different page (of the same desktop).
Inter-page Communication

To do inter-page communication, you could do:
1. Invoke methods of components from another page directly.
2. Use {@link Execution#postEvent} to post events to components fromanother page.
They are the same as handling components from the same page. However, invoking method directly for components from another page has one restriction:
It cannot create component. @author tomyeh

  private void checkPageRemoved(Set removed) {
    //1. scan once
    final Desktop desktop = _exec.getDesktop();
    Set pages = null;
    for (Iterator it = desktop.getPages().iterator(); it.hasNext();) {
      final Page page = (Page)it.next();
      final Component owner = ((PageCtrl)page).getOwner();
      if (owner != null) { //included
        final Page ownerPage = owner.getPage();
        if (ownerPage == null //detached
        || (_pgInvalid != null && _pgInvalid.contains(ownerPage))
        || isAncestor(_invalidated, owner, true)
        || isAncestor(_attached, owner, true)
        || isAncestor(removed, owner, true)) {
          addPageRemoved(page);
        } else {
          if (pages == null) pages = new LinkedHashSet();
          pages.add(page);
        }
      }
    }
    if (_pgRemoved == null || pages == null) return;
      //done if no page is removed or no more included page


    //2. if a page is ever removed, it might cause chain effect
    //so we have to loop until nothing changed
    boolean pgRemovedFound;
    do {
      pgRemovedFound = false;
      for (Iterator it = pages.iterator(); it.hasNext();) {
        final Page page = (Page)it.next();
        final Component owner = ((PageCtrl)page).getOwner();
        if (_pgRemoved.contains(owner.getPage())) { 
          it.remove();
          addPageRemoved(page);
          pgRemovedFound = true;

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  }
  /** Clears components if it belongs to invalidated or removed page. */
  private void clearInInvalidPage(Collection coll) {
    for (Iterator it = coll.iterator(); it.hasNext();) {
      final Component comp = (Component)it.next();
      final Page page = comp.getPage();
      if (page != null
      && ((_pgRemoved != null && _pgRemoved.contains(page))
      ||  (_pgInvalid != null && _pgInvalid.contains(page))))
        it.remove();
    }

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    }


    //3. generate response for invalidated pages
    if (_pgInvalid != null) {
      for (final Iterator it = _pgInvalid.iterator(); it.hasNext();) {
        final Page page = (Page)it.next();
        responses.add(new AuOuter(page, redraw(page)));
      }
    }


/*    if (log.finerable())
      log.finer("After removing redudant: invalidated: "+_invalidated
      +"\nAttached: "+_attached+"\nSmartUpd:"+_smartUpdated);
*/
    //4. process special interfaces


    //5. generate replace for invalidated
    for (Iterator it = _invalidated.iterator(); it.hasNext();) {
      final Component comp = (Component)it.next();
      responses.add(new AuOuter(comp, redraw(comp)));
    }


    _ending = true; //no more addSmartUpdate...


    //6. add attached components (including setParent)
    //Due to cyclic references, we have to process all siblings
    //at the same time
    final List desktops = new LinkedList();
    final Component[] attached = (Component[])
      _attached.toArray(new Component[_attached.size()]);
    for (int j = 0; j < attached.length; ++j) {
      final Component comp = attached[j];
      //Note: attached comp might change from another page to
      //the one being created. In this case, no need to add
      if (comp != null) {
        final Page page = comp.getPage();
        if (page != null && _exec.isAsyncUpdate(page)) {
          final Component parent = comp.getParent();
          final Set newsibs = new LinkedHashSet(32);
          newsibs.add(comp);
          desktops.add(newsibs);

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  private Set doMoved(List responses) {
    //Remove components that have to removed from the client
    final Set removed = new LinkedHashSet();
    for (Iterator it = _moved.iterator(); it.hasNext();) {
      final Component comp = (Component)it.next();
      final Page page = comp.getPage();
      if (page == null) {
        removed.add(comp);


        if (_responses != null) _responses.remove(comp);
        _invalidated.remove(comp);

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   */
  private static
  void addResponsesForCreatedPerSiblings(List responses, Set newsibs,
  Map croppingInfos) throws IOException {
    final Component parent;
    final Page page;
    {
      final Component comp = (Component)newsibs.iterator().next();
      parent = comp.getParent();
      page = comp.getPage();
    }
    Collection sibs;
    if (parent != null) {
      sibs = getAvailableAtClient(parent, croppingInfos);
      if (sibs == null) //no cropping
        sibs = parent.getChildren();
      else if (sibs.size() > 1 && !(sibs instanceof LinkedHashSet)) {
//        log.warning("Use LinkedHashSet instead of "+sibs.getClass());
        final Set s = new LinkedHashSet(sibs.size() * 2);
        for (Iterator it = parent.getChildren().iterator(); it.hasNext();) {
          final Object o = it.next();
          if (sibs.remove(o)) {
            s.add(o);
            if (sibs.isEmpty())
              break;
          }
        }
        sibs = s;
      }
    } else {
      sibs = page.getRoots();
    }
//    if (D.ON && log.finerable()) log.finer("All sibs: "+sibs+" newsibs: "+newsibs);


    /* Algorithm:
  1. Locate a sibling, say <a>, that already exists.

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      ((SessionCtrl)sess).notifyClientRequest(true);


      final UiFactory uf = wappc.getUiFactory();
      final Richlet richlet = new StandaloneRichlet(comp);


      final Page page = WebManager.newPage(uf, ri, richlet, response, path);
      exec = new ExecutionImpl(ctx, request, response, desktop, page);
      exec.setAttribute(Attributes.PAGE_REDRAW_CONTROL, "page");
      exec.setAttribute(Attributes.PAGE_RENDERER, new PageRenderer(exec));


      wappc.getUiEngine().execNewPage(exec, richlet, page, out);

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    } else if (beanid.startsWith(".")) { //a relative component Path: ./ or ../
      bean = Path.getComponent(comp.getSpaceOwner(), beanid);
    } else {
      //VariableResolver would need such "self" information when doing
      //variable resolving
      final Page page = comp.getPage();
      if (page != null) { //Bug #2823591, try to "load" into a detached(no page) component and NPE
        //bug #2932475, NoSuchMethodException in DataBinder (SpaceOwner-Mixup)
        bean = Components.getImplicit(comp, beanid);
        //bug #2945974
        //dirty patch
        if ("param".equals(beanid) && bean != null) {
          bean = new HashMap((Map) bean); 
        }
        if (bean == null) {
          bean = page.getZScriptVariable(comp, beanid);
          if (bean == null) {
            final Object self = page.getAttribute("self");
            try {
              page.setAttribute("self", comp);
              bean = comp.getAttributeOrFellow(beanid, true);
              if (bean == null)
                bean = page.getXelVariable(null, null, beanid, true);
            } finally {
              if (self == null) {
                page.removeAttribute("self");
              } else {
                page.setAttribute("self", self);
              }
            }
          }
        }
      }

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  private Comparator toComparator(String clsnm)
  throws ClassNotFoundException, InstantiationException,
  IllegalAccessException {
    if (clsnm == null || clsnm.length() == 0) return null;


    final Page page = getPage();
    final Class cls = page != null ?
      page.getZScriptClass(clsnm): Classes.forNameByThread(clsnm);
    if (cls == null)
      throw new ClassNotFoundException(clsnm);
    if (!Comparator.class.isAssignableFrom(cls))
      throw new UiException("Comparator must be implemented: "+clsnm);
    return (Comparator)cls.newInstance();

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    if (ComponentsCtrl.getEventMethod(comp.getClass(), evtnm) != null
    || comp.isListenerAvailable(evtnm, asap))
      return true;


    if (!asap) {
      final Page page = comp.getPage();
      return page != null && page.isListenerAvailable(evtnm);
    }
    return false;
  }

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    final Thread thd = (Thread)Thread.currentThread();
    if (!(thd instanceof EventProcessingThread)) {
      if (!desktop.getWebApp().getConfiguration().isEventThreadEnabled()) {
        final ExecutionCtrl execCtrl = (ExecutionCtrl)exec;
        final Page page = execCtrl.getCurrentPage();
        final EventProcessor proc =
          new EventProcessor(desktop, comp, event);
        proc.setup();
        try {
          proc.process();

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Examples of org.zkoss.zk.ui.Page

Desktop

Inter-page Communication

Related Classes of org.zkoss.zk.ui.Page