Examples of org.apache.tapestry.callback.ICallback

org.apache.tapestry.callback.ICallback
Defines a callback, an object which is used to invoke or reinvoke a method on an object or component in a later request cycle. This is used to allow certain operations (say, submitting an order) to defer to other processes (say, logging in and/or registerring).
Callbacks must be {@link Serializable}, to ensure that they can be stored between request cycles. @version $Id: ICallback.java 243791 2004-02-19 17:38:13Z hlship $ @author Howard Lewis Ship @since 0.2.9

        Visit visit = (Visit) cycle.getEngine().getVisit();


        if (visit != null && visit.isUserLoggedIn())
            return;


        ICallback callback = new PageCallback(getPage().getPageName());
        Login loginPage = (Login) cycle.getPage("Login");
        loginPage.setCallback(callback);
        cycle.activate(loginPage);
    }

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        Visit visit = (Visit) cycle.getEngine().getVisit();


        if (visit != null && visit.isUserLoggedIn())
            return;


        ICallback callback = new PageCallback(getPage().getPageName());
        Login loginPage = (Login) cycle.getPage("Login");
        loginPage.setCallback(callback);
        cycle.activate(loginPage);
    }

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        visit.setUser(person);


        // After logging in, go to the MyLibrary page, unless otherwise
        // specified.


        ICallback callback = getCallback();


        if (callback == null)
            cycle.activate("Home");
        else
            callback.performCallback(cycle);


        // I've found that failing to set a maximum age and a path means that
        // the browser (IE 5.0 anyway) quietly drops the cookie.


        IEngine engine = getEngine();

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    public IPage login()
    {
        if (isLoggedIn())
            return null;


        ICallback callback = new PageCallback(getPage().getPageName());


        Login login = getLogin();


        login.setCallback(callback);

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