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If it is, the following comparison will be true: if (bytesRead & 1 == 1) { This part of the code then deals with the second of a pair of hex digits It makes space for this digit in the current byte using a bitwise operator to shift the existing 4 bits in that byte by 4 bits to the left, leaving space for the second 4 bites to be set using the value in bytesRead tagBytes[bytesRead >> 1] = (val | (tempByte << 4)); It then checks if it has reached the checksum byte, and if so it calculates the checksum using an XOR operation if (bytesRead >> 1 != 5) { checksum ^= tagBytes[bytesRead >> 1]; }; This part of the code then deals with the first of a pair of hex digits by simply putting the value directly into a variable.

Doing so should generate enough information to allow a detailed understanding of the reasons for the random failures occurring On the other hand, there is a subtle catch: the more log messages you add to your application, the further its behavior will change Every call to Loggerlog adds additional delays, and formatting your recorded messages also takes time In fact, a failure that only occurs onethird of the time might almost completely disappear because of all the logging code added to your application Increasingly, a failure becomes more difficult to repeat, and therefore more difficult to evaluate Sometimes, you almost want to give up trying to emulate the problem, even with a debugger However, from time to time the failure might reappear on someone else s machine In NetBeans, we have a farm of machines that run tests on a daily basis in various configurations.

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This value will then be shifted 4 bits to the left on the next loop through by the code above } else {.

This frequently helps to track down even the rarest of errors Even when we don t find the bug on the developer s workstation, we tend to receive bug reports from the testing infrastructure, enabling us to hunt the bug down there Another problem arises when there are too many logging messages in your application In this scenario, it s difficult to pinpoint where the messages are coming from For example, if the test executes a series of steps that result in repeated calls to the same piece of application code, the same log messages are printed and you can find yourself completely lost This is especially difficult if the application performs a computation in a loop, where it repeats the same or similar messages over and over again In such cases, my advice is to put your logging messages into the testing code itself.

tempByte = val; }; The sketch then increments the counter that tracks how many bytes have been read and reaches the end of the loop, going back to the start to check if it has finished reading all the digits yet bytesRead++; } The sketch checks if 12 bytes have been read, indicating that it has a complete read and can move on to comparing the acquired value with its list of authorized tags if (bytesRead == 12) { The tagValue array of characters now contains a sequence of 10 characters in elements 0 through 9, but we need to make sure it s null-terminated so that the sketch can treat it as a string and know where the string ends We therefore populate the eleventh element (element 10) with the null character.

You already know that LatestContentNode needs to accept three arguments in its constructor: The model to retrieve items from The number of items to retrieve The name of a variable to store the items in So you can start by writing its constructor (remember that a Python object s constructor is always called __init__()) and simply storing those arguments as instance variables: class LatestContentNode(template.Node): def __init__(self, model, num, varname): self.model = model self.num = int(num) self.varname = varname Notice that you force num to be an int here. All the arguments to the tag came in as strings, so before you can use this to control the number of items to retrieve, it needs to be converted to an actual number. Here s a simple way the render() method could be written: def render(self, context): context[self.varname] = self.model.objects.all()[:self.num] return '' At first, this looks fine, but it s got a hidden problem. When you call it like so: {% get_latest_content coltrane.entry 5 as latest_entries %}

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