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A good summary of the advantages and disadvantages is provided at the MQ web site: wwwzeromqorg/docs:welcome-from-amqp How should you approach this range of possible solutions, or evaluate other message queue technologies or libraries that you might find mentioned on Python blogs or PyCon talks You should probably focus on the particular message pattern that you need to implement If you are using messages as simply a lightweight and load-balanced form of RPC behind your front-end web machines, for example, then MQ might be a great choice; if a server reboots and its messages are lost, then either users will time out and hit reload, or you can teach your front-end machines to resubmit their requests after a modest delay.

height of the font into account. The width of a given text for most fonts depends on the text because characters widths differ.

But if your messages each represent an unrepeatable investment of effort by one of your users if, for example, your social network site saves user status updates by placing them on a queue and then telling the users that their update succeeded then a message broker with strong guarantees against message loss will be the only protection your users will have against having to re-type the same status later when they notice that it never got posted Listing 8 3 shows some of the patterns that can be supported when message queues are used to connect different parts of an application It requires MQ, which you can most easily make available to Python by creating a virtual environment and then typing the following: $ pip install pyzmq-static The listing uses Python threads to create a small cluster of six different services.

The code for Twitter.js will open in the VWD editor. To create more room to examine the code, click the Autohide icon in the Toolbox window. Note that all windows in VWD have this capability (see Figure 8-22).

Listing 7-9. The constructor and the sizeHint method of the button MyButton::MyButton( QWidget *parent ) : QAbstractButton( parent ) { } QSize MyButton::sizeHint() const { return QSize( fontMetrics().width( text() )+10, fontMetrics().height()+10 ); } The task of painting the button is taken care of in the paintEvent method (see Listing 7-10). The method starts with the creation of a QPainter object for painting to the widget. All widgets are double-buffered by Qt, so when you draw to the painter, you are actually drawing to a buffer that is used to redraw the screen. This means that you do not have to worry about flickering. There are two ways to draw widgets: directly or through a style. By using a style, you can adapt the widget s look to the rest of the system. By drawing directly to the widget, you get full control. For the button you will draw the frame and background using a style and the text directly.

One pushes a constant stream of words on to a pipeline Three others sit ready to receive a word from the pipeline; each word wakes one of them up The final two are request-reply servers, which resemble remote procedure endpoints (see 18) and send back a message for each message they receive..

Each widget has a QStyle associated with it that you can reach through the style property. This style usually reflects the system s setting, but it might have been changed from the code instantiating widget. The widget itself should not care about the origin of the style or its relation to the current platform. Before you can use the style for drawing, you need to set up a style option object (in this case, a QStyleOptionButton object). The style option class to use depends on the style element to draw. By referring to the Qt documentation for the drawControl method, you can see which style object it expects. The style option object is initialized by passing the this pointer to its init method, which configures most of the settings. However, you still need to tell whether the button is being pressed or is toggled. These states are available from the isDown and isChecked methods implemented by the QAbstractButton class. If the isDown method returns true, the button is currently being pressed. If isChecked returns true, the button has been toggled and is currently checked (that is, in its on state). When the button is being pressed, set the QStyle::State_ Sunken bit in the style option s state property. For checked buttons, the QStyle::State_On bit is set.

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