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Because each layer contains its own logic, sometimes it can be tricky to decide where exactly to draw the line between the tiers In the previous scenario, instead of reading the product s quantity in the business tier and deciding whether the product is available based on that number (resulting in two data tier, and implicitly, database, calls), you could have a single data tier method named add_product_if_available that adds the product to the shopping cart only if it s available in stock In this scenario, some logic is transferred from the business tier to the data tier In many other circumstances, you might have the option to place some logic in one tier or another or maybe in both.

The ErrorDisplay component will construct the output HTML in code; therefore it will inherit from the org.apache.tapestry.AbstractComponent. For this component we are making full use of Tapestry annotations to define the component. Instead of having a component specification file (.jwc), we use the org.apache.tapestry.annotations.ComponentClass and org.apache. tapestry.annotations.Parameter annotations to define the component and its parameters respectively. The renderComponent method is responsible for rendering the component s body. To create the HTML, we use an instance of IMarkupWriter, which is passed as a parameter to the method. Listing 7-29 shows the implementation of the ErrorDisplay component. Listing 7-29. ErrorDisplay Custom Component package com.integrallis.techconf.web.tapestry.components; ... @ComponentClass(allowBody = false, allowInformalParameters = false) public abstract class ErrorDisplay extends AbstractComponent { @Parameter(required = true) public abstract IValidationDelegate getDelegate(); @SuppressWarnings("unchecked") public void renderComponent(IMarkupWriter writer, IRequestCycle cycle) { if (cycle.isRewinding()) return; IValidationDelegate delegate = getDelegate(); // check the validation delegate, if there are no errors just return if (delegate != null) { if (!delegate.getHasErrors()) return; writer.begin("table"); writer.attribute("class", "red"); writer.begin("tr"); writer.attribute("valign", "top"); writer.begin("td"); writer.beginEmpty("img"); writer.attribute("src", "../images/warning.png"); writer.attribute("width", 42); writer.attribute("height", 42); writer.end(); writer.begin("td"); writer.attribute("class", "message");

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Qt uses the QAbstractItemModel to encapsulate the full flexibility of a tree of tables; normally, a QAbstractListModel or QAbstractTableModel suffices, hiding the complexity of the tree unless you really need it In most cases, you don t even need to create your own model; instead you can use a QStringListModel for a one-dimensional list of QStrings, or a QStandardItemModel for one- or two-dimensional array, as well as data structured in a hierarchy The two-dimensional nature of the QTableModel is strongly reminiscent of a SQL database s tables, and it almost immediately comes to mind when you have data organized in rows with different facets of the data in each column It shouldn t, however in a Qt table model, each cell in the table is independent of every other cell Think of a Qt table like a financial spreadsheet (not a well-formatted list!).

In most cases, there is no single best way to implement the three-tier architecture, and you ll need to make a compromise or a choice based on personal preference or external constraints Furthermore, there are occasions in which even though you know the right way (in respect to the architecture) to implement something, you might choose to break the rules to get a performance gain As a general rule, if performance can be improved this way, it is okay to break the strict limits between tiers just a little bit (for example, add some of the business rules to the data tier or vice versa), if these rules are not likely to change in time Otherwise, keeping all the business rules in the middle tier is preferable because it generates a cleaner application that is easier to maintain.

List<IRender> errorRenders = delegate.getErrorRenderers(); writer.begin("ul"); for (IRender render : errorRenders) { writer.begin("li"); render.render(writer, cycle); writer.end(); } writer.end(); writer.end("table"); } } }

Finally, don t be tempted to access the data tier directly from the presentation tier This is a common mistake that is the shortest path to a complicated, hard-to-maintain, and inflexible system In many data access tutorials or introductory materials, you ll be shown how to perform simple database operations using a simple user interface application In these kinds of programs, all the logic is probably written in a short, single file, instead of separate tiers Although the materials might be very good, keep in mind that most of these texts are meant to teach you how to do different individual tasks (for example, access a database), and not how to correctly create a flexible and scalable application..

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