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Whatever message queue you use, I should warn you that it may very well cause a revolution in your thinking and eventually make large changes to the very way that you construct large applications Before you encounter message queues, you tend to consider the function or method call to be the basic mechanism of cooperation between the various pieces of your application And so the problem of building a program, up at the highest level, is the problem of designing and writing all of its different pieces, and then of figuring out how they will find and invoke one another If you happen to create multiple threads or processes in your application, then they tend to correspond to outside demands like having one server thread per external client and to execute code from across your entire code base in the performance of your duties.

If you need to refresh your memory about how blocks are structured, refer to 7. The Twitter.js code is shown in Listing 8-1 for your reference.

it is important to leave the properties appearing under the QPushButton heading in the Property Editor untouched. Otherwise, you will experience compilation errors. All properties from the base class (QAbstractButton) and up can be used freely.

The thread might receive a submitted photograph, then call the routine that saves it to storage, then jump into the code that parses and saves the photograph s metadata, and then finally execute the image processing code that generates several thumbnails This single thread of control may wind up touching every part of your application, and so the task of scaling your service becomes that of duplicating this one piece of software over and over again until you can handle your client load If the best tools available for some of your sub-tasks happen to be written in other languages if, for example, the thumbnails can best be processed by some particular library written in the C language then the seams or boundaries between different languages take the form of Python extension libraries or interfaces like ctypes that can make the jump between different language runtimes.

The dialog s name is set to Dialog, and the middle button is named clickButton before the design is saved as dialog.ui.

Once you start using message queues, however, your entire approach toward service architecture may begin to experience a Copernican revolution Instead of thinking of complicated extension libraries as the natural way for different languages to interoperate, you will not be able to help but notice that your message broker of choice supports many different language bindings.

Figure 7-25. Using MyButton from Designer To show the dialog, declare a minimal dialog class (shown in Listing 7-11 and Listing 7-12). The dialog simply sets up the user interface from the design and connects the button s clicked signal to a slot showing a dialog. Listing 7-11. Header of a minimal dialog class Dialog : public QDialog { Q_OBJECT public: Dialog(); private slots: void buttonClicked(); private: Ui::Dialog ui; };

Listing 8-1. Twitter Block Source Code componentManager.add("twitter", "TwitterClass", "/content/components/icons/twitter.png", "/content/components/icons/twitterLogo.png"); // ************** // BEGIN TWITTER BLOCK // ************** function TwitterClass() { this.__getLatestPosts = [new TwitterStatus()]; }

Why should a single thread of control on one processor, after all, have to wind its way through a web framework, then a database client, and then an imaging library, when you could make each of these components a separate client of the messaging broker and connect the pieces with language-neutral messages You will suddenly realize not only that a dedicated thumbnail service might be quite easy to test and debug, but also that running it as a separate service means that it can be upgraded and expanded without any disruption to your front-end web servers New servers can attach to the message queue, old ones can be decommissioned, and software updates can be pushed out slowly to one back end after another without the front-end clients caring at all The queued message, rather than the library API, will become the fundamental point of rendezvous in your application..

Listing 7-12. Implementation of a minimal dialog Dialog::Dialog() : QDialog() { ui.setupUi( this ); connect( ui.clickButton, SIGNAL(clicked()), this, SLOT(buttonClicked()) ); }

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