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Listing 8 3. Two Schemes for Assigning Data to Servers #!/usr/bin/env python # Foundations of Python Network Programming - 8 - queuecrazy.py # Small application that uses several different message queues import random, threading, time, zmq zcontext = zmq.Context() def def def def fountain(url): """Produces a steady stream of words.""" zsock = zcontext.socket(zmq.PUSH) zsock.bind(url) words = [ w for w in dir(__builtins__) if w.islower() ] while True: zsock.send(random.choice(words)) time.sleep(0.4) responder(url, function): """Performs a string operation on each word received.""" zsock = zcontext.socket(zmq.REP) zsock.bind(url) while True: word = zsock.recv() zsock.send(function(word)) # send the modified word back processor(n, fountain_url, responder_urls): """Read words as they are produced; get them processed; print them.""" zpullsock = zcontext.socket(zmq.PULL) zpullsock.connect(fountain_url) zreqsock = zcontext.socket(zmq.REQ) for url in responder_urls: zreqsock.connect(url) while True: word = zpullsock.recv() zreqsock.send(word) print n, zreqsock.recv() start_thread(function, *args): thread = threading.Thread(target=function, args=args) thread.daemon = True # so you can easily Control-C the whole program thread.start()

Note The state bits are added using the |= operator (bitwise or), not clearing any bits set by the init

start_thread(fountain, 'tcp://127.0.0.1:6700') start_thread(responder, 'tcp://127.0.0.1:6701', str.upper) start_thread(responder, 'tcp://127.0.0.1:6702', str.lower) for n in range(3): start_thread(processor, n + 1, 'tcp://127.0.0.1:6700', ['tcp://127.0.0.1:6701', 'tcp://127.0.0.1:6702']) time.sleep(30)

VWD has a rich editor that has first-class capabilities. It recognizes JavaScript keywords and color codes them for easier identification and reading. There are many more features in the developer that you can read about in the documentation.

When the style object has been properly set up, the drawControl(ControlElement, QStyleOption*, QPainter*, QWidget*) of the current style method is called. In the call, you ask for a QStyle::CE_PushButtonBevel to be painted, which paints all parts of the button except the text and optional icon. The second half of the paintEvent method takes care of painting the text directly to the widget. It starts by setting the font of the painter to the widget s current font. Then the color of the pen is determined, depending on the state of the button. Disabled buttons have gray text, pressed buttons have red text, and all other buttons have dark red text. Notice that isDown returns true when the button is actively pressed, not when toggled buttons are left in the on state. This means that the text lights up only when the mouse button is pressed. When the pen and font of the painter are configured, continue by drawing the actual text with drawText. The text is centered in the button and is contained by the actual rectangle that the button occupies. You don t take the margins that you added in the sizeHint method into account. The paintEvent method accepts a QPaintEvent pointer as argument; a pointer that you choose to ignore in this example. The event object has a member method called rect() that returns a QRect, specifying the rectangle that the paintEvent method needs to update. For some widgets you can limit the painting to that rectangle to improve performance. Listing 7-10. Painting the bevel using a style and the text directly void MyButton::paintEvent( QPaintEvent* ) { QPainter painter( this );

The two request-reply servers are different one turns each word it receives to uppercase, while the other makes its words all lowercase and you can tell the three processors apart by the fact that each is assigned a different integer. The output of the script shows you how the words, which originate from a single source, get evenly distributed among the three workers, and by paying attention to the capitalization, you can see that the three workers are spreading their requests among the two requestreply servers: 1 2 3 1 2 3 HASATTR filter reduce float BYTEARRAY FROZENSET

QStyleOptionButton option; option.init( this ); if( isDown() ) option.state |= QStyle::State_Sunken; else if( isChecked() ) option.state |= QStyle::State_On; style()->drawControl( QStyle::CE_PushButtonBevel, &option, &painter, this ); painter.setFont( font() ); if( !isEnabled() ) painter.setPen( Qt::darkGray ); else if( isDown() ) painter.setPen( Qt::red ); else painter.setPen( Qt::darkRed ); painter.drawText( rect(), Qt::AlignCenter, text() ); } To try out the button, you create a dialog with it. The resulting dialog is shown in action in Figure 7-26 (but you are still a few steps away). Start by creating a new dialog in Designer. Add three QPushButton widgets to the dialog and set their text properties according to the figure of the dialog. Also, set the enabled property to false for the top button and the checkable button to true for the bottom one. Right-click each button and choose Promote To Custom Widget from the popup menu. This will display the dialog shown alongside the popup menu in Figure 7-25. By entering MyButton as the custom class name in the dialog, the header file name will (correctly) be guessed to be mybutton.h, which will cause the user interface compiler to use the MyButton class when creating the buttons instead of the QPushButton class.

In practice, of course, you would usually use message queues for connecting entirely different servers in a cluster, but even these simple threads should give you a good idea of how a group of services can be arranged.

Caution Because MyButton does not inherit QPushButton (it inherits the QAbstractButton class),

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