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Therefore, you need to review it before integration and measure it according to the suggestions found in this book, as well as by any other suggestions that help guarantee a simple evolution path into the future Another bad thing might be an underdocumented patch Again, it s simple to request further documentation or to ask the submitter to provide more high-level use cases On the other hand, this requirement could be partially replaced by good test coverage, because automated tests are often the best form of documentation The last aspect that you should pay attention to is proper versioning In modular systems with version numbers, you should increase the specification version with every API change and document the new behavior available since that version The best approach to accepting patches is to do a review before committing them.

When using a shift register to provide outputs, we must provide three signals from the Arduino: clock (CLK), data (D), and latch (Q). We might also want to provide an output enable (OE) signal so that the outputs remain off until we initialize them properly.

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This is easy to do when you get a patch from an external contributor However, review before commit is the best way to ensure a proper response from the provider of the patch even if it s your closest teammate Until the change is integrated, the motivation to solve your issues is magnified by the need to have the patch accepted Usually, after integration the contributor s will to fix additional problems is lowered relative to the time passed since the patch s acceptance This means that the only suitable time for minimizing the maintenance cost is before integrating a patch All the problems found later are likely to end up on the plate of the maintainer of the library, rather than the submitter of the patch..

Templating the confirmation page is easy enough. You can display some information about the snippet the user is about to unbookmark, and then you can include a simple form that submits the confirmation via POST: <form method="post" action=""> <p><input type="submit" value="Delete bookmark"></p> </form>

Note The small number of signals required to provide additional outputs can also be helpful if the driven devices are located a short distance from the Arduino itself. Thus instead of running, say, eight wires plus power and ground, you can run three or four and power/ground.

IT S SO NICE TO ACCEPT PATCHES!

Taking the example in Figure 16-7, we have a single eight-output serial in parallel out shift register/latch connected to the Arduino. To set Output 3 high and all other outputs low, we would set D low, transition CLK Low-High four times, set D high, transition CLK Low-High once, set D low again, then transition CLK a further three times. Thus, we shift in the sequence 00001000 into the register. Finally, we transition the Q (latch) signal Low-High-Low to move this new pattern to the output pins themselves.

As a maintainer of parts of an open source framework, I can say that I am always pleased to receive good patches from others. Sometimes I feel that the requirements I impose on them are too high and that it s not easy to fulfill all of them. Sometimes I am even in doubt as to whether to accept something that is not properly tested or that is underdocumented. However, I am aware of the potential problems of maintaining buggy patches into the future. Usually I request an improved patch. Either I then receive the improvement or I don t. If not, that probably means I was right, as the submitter probably wouldn t do a good job providing support for the API change later.

Requiring an HTTP POST helps somewhat against CSRF, because it means that an attacker can t merely display a link to a particular page and have that trigger deletion of content. However, for full protection, you ll want to refer to and enable django.contrib.csrf, an application bundled with Django that provides some stronger measures. It automatically inserts and checks for a randomly generated string in an incoming POST submission, and it returns an HTTP 403 (Forbidden) response if that string is not posted back by the user s browser. You can find full documentation for this system online at www.djangoproject.com/ documentation/csrf/.

Figure 16-7. Adding output pins with single eight-output shift register Compare now with Figure 16-8 where we have two eight-output latches connected. The number of pins used on the Arduino stays the same. We simply daisy chain the Data Out from the first latch to the Data In on the second. We now must shift 16 bits to fully define the state of the outputs. This basic arrangement can be repeated many times over. The main limitation is the number of CLK and Q signals that can be driven from the Arduino anything over 16 could be marginal.

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