Examples of org.zkoss.zk.ui.Execution

org.zkoss.zk.ui.Execution
An execution of a client request (e.g., ServletRequest). When a request sent from a client, the server constructs a {@link Execution}object to hold execution relevant info, and then serves the request thru this execution.
A client request, e.g., HttpServletRequest, might consist of multiple ZK request ( {@link org.zkoss.zk.au.AuRequest}). However, these ZK requests must target the same desktop of pages ( {@link Page}).
Because a request might come from HTTP or other protocol, Execution also serves as an isolation layer. @author tomyeh @see Page

   * @since 5.0.0
   */
  public static final String outDeviceJavaScripts(ServletContext ctx,
   HttpServletRequest request, HttpServletResponse response,
   String deviceType) {
     Execution old = Executions.getCurrent();
     Execution exec = new ExecutionImpl(ctx, request, response, null, null); 
    ExecutionsCtrl.setCurrent(exec);
     ((ExecutionCtrl)exec).onActivate();
    try {
      return HtmlPageRenders.outLangJavaScripts(exec,
        WebManager.getWebManager(ctx).getWebApp(),

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   *
   * @return the string holding the HTML tags, or null if already generated.
   * @param deviceType the device type. If null, ajax is assumed.
   */
   public static String outZkHtmlTags(String deviceType) {
     Execution exec = Executions.getCurrent();
     if (exec != null)
       return HtmlPageRenders.outZkTags(exec, null, null);


     return JspFns.outZkHtmlTags(
      ServletFns.getCurrentServletContext(),

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   *
   * <p>This method is used for DSP pages.
   * @param deviceType the device type. If null, ajax is assumed.
   */
  public static final String outDeviceStyleSheets(String deviceType) {
    final Execution exec = Executions.getCurrent();
     if (exec != null)
      return HtmlPageRenders.outLangStyleSheets(exec, null, null);


     return JspFns.outDeviceStyleSheets(
      ServletFns.getCurrentServletContext(),

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  /** Returns HTML tags to include JavaScript files of the specified
   * device for the current application (never null).
   * @since 5.0.0
   */
  public static final String outDeviceJavaScripts(String deviceType) {
    final Execution exec = Executions.getCurrent();
     if (exec != null)
      return HtmlPageRenders.outLangJavaScripts(exec, null, null);


     return JspFns.outDeviceJavaScripts(
      ServletFns.getCurrentServletContext(),

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      if (getCurrent() == null) //no scope allowed
        return getImplicit(name);


      if (_firstGet) {
        _firstGet = false;
        final Execution exec = Executions.getCurrent();
        if (exec != null) {
          Object val = exec.getAttribute(name);
          if (val != null /*||exec.hasAttribute(name)*/) //exec not support hasAttribute
            return val;
        }
      }

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      if (curr== null)
        return getImplicit(name); //ignore scope


      if (_firstGet) {
        _firstGet = false;
        final Execution exec = Executions.getCurrent();
        if (exec != null && exec != curr) {
          Object val = exec.getAttribute(name);
          if (val != null /*||exec.hasAttribute(name)*/) //exec not support hasAttribute
            return val;
        }


        //_scope is the nearest IdSpace so it might not be curr

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      locale = Locales.getCurrent();


    final StringBuffer sb = new StringBuffer(4096);
    final Locale oldl = Locales.setThreadLocal(locale);
    try {
      final Execution exec = Executions.getCurrent();
      sb.append(loadJS(exec, "~./js/zk/lang/msgzk*.js"));
      sb.append(Wpds.outLocaleJavaScript());
      sb.append(loadJS(exec, "~./js/zul/lang/msgzul*.js"));
    } finally {
      Locales.setThreadLocal(oldl);

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    subscribe(listener, null, async);
  }
  private void
  subscribe(EventListener listener, EventListener callback, boolean async) {
    if (async && _nAsync++ == 0) {
      final Execution exec = Executions.getCurrent();
      if (exec == null)
        throw new IllegalStateException("Execution required");
      _serverPushEnabled = !exec.getDesktop().enableServerPush(true);
    }
    _listeners.add(new ListenerInfo(listener, callback, async));
  }

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    subscribe(listener, null, async);
  }
  private void subscribe(EventListener listener, EventListener callback, boolean async) {
    if (listener == null)
      throw new IllegalArgumentException();
    final Execution exec = Executions.getCurrent();
    if (exec == null)
      throw new IllegalStateException("execution required");


    final Desktop desktop = exec.getDesktop();
    synchronized (_dts) {
      boolean startRequired = false;
      DesktopThread dtthd = (DesktopThread)_dts.get(desktop);
      if (dtthd == null) {
        desktop.addListener(new EQCleanup());

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  }
  public boolean isSubscribed(EventListener listener) {
    if (listener == null)
      return false;


    final Execution exec = Executions.getCurrent();
    if (exec == null)
      throw new IllegalStateException("execution required");


    final Desktop desktop = exec.getDesktop();
    synchronized (_dts) {
      DesktopThread dtthd = (DesktopThread)_dts.get(desktop);
      return dtthd != null && dtthd.isSubscribed(listener);
    }
  }

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