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even escape the data for you All you need to worry about is telling Taconite what values should be sent to the server, and it takes care of the rest Since all the JavaScript is created by the parser based on the HTML you specify, you don t have to worry about dealing with browser JavaScript incompatibilities The parser takes care of them for you Did you catch that Taconite takes care of the incompatibilities Seriously, you don t have to worry about it; we ve done that for you All you need to do is specify the dynamic content as HTML within a JSP and the parser does the rest.

Consider the following application design for a StockTrader application for mutual fund trades, which cannot be executed until after the stock exchange closes for the day. Clients can send trade requests to their broker, but they will be stored and processed later, once the stock exchange is closed. Here is the workflow between the client and service:

What is the percentage of open issues to total issues A high percentage suggests the module is no longer maintained. Click view usage statistics at the bottom of the page; a higher number of users means there s a better chance people are actively maintaining the module. What is the date of the last official release How thoroughly documented is the module

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, The beauty of Taconite s design is that it encourages you to keep all your business logic on the server side (where, frankly, it is a lot easier to write) while the browser does what it does best: it renders a user interface Taconite trivializes the task of making Ajax requests from the browser to the server so you can reuse domain logic with ease Of course, removing redundancy is not the only reason you should avoid business logic in the browser Hosting domain logic on the client can open security vulnerabilities.

1. A client decides that they want to place a mutual fund trade. 2. The client formats an XML message with the details of the trade and sends it to the StockTrader Web service. 3. The StockTrader Web service receives the message but does not process the trade immediately. Instead, the Web service drops the message into a queue for later processing. 4. The StockTrader Web service formats an acknowledgment response message to the client to let them know that the trade request has been received and that it will be processed shortly. 5. The client receives the response message. Let s implement this workflow using a TCP-based StockTrader Web service that integrates with a message queue on its host server.

Summary

Successfully translating business requirements to Drupal functionality is a creative process that requires a mix of planning and foresight. In this chapter, I discussed several tips, tricks, and tools I use to help translate clients requirements into Drupal functionality. I began by discussing steps to take to grow in Drupal knowledge, including studying other Drupal-powered web sites and creating reference sheets. I included links to many popular and informative destinations on Drupal.org. I closed the chapter with a discussion on how to evaluate whether a module is a good fit for a site.

If your logic is implemented on the browser, what s keeping a malicious user from using a tool such as Greasemonkey to update the JavaScript and insert some special processing (say a 90-percent discount on your new widget ) Taconite makes it easy to access your business routines on the server side where it s easiest to develop, debug, and secure Taconite s server-side library is lightweight, requiring only your favorite JSP/servlet container and nothing else Configuration is minimal (no reams of XML here!); all you have to do is add Taconite s tag library descriptor (TLD) location to the WEB-INFxml file Thanks to its small size and zero dependencies, Taconite plays nicely with any J2EE Web framework Whether you use Struts, Spring, MVC, WebWork, Tapestry, or something else entirely, you can use Taconite without any extra work or a steep learning curve.

Our first step is to create the message queue using MSMQ and then create a message queue trigger, which will respond to incoming messages. MSMQ is available with the Windows 2000 operating system and higher. If you do not have MSMQ installed you can add it using the Control Panel Add or Remove Programs option (select Add/Remove Windows Components from the selection screen). MSMQ is included under the Computer Management MMC snap-in, as shown in Figure 8-5.

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