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Here s our class with a slow computation method. The slow_compute() method really doesn t do anything interesting; it just sleeps and eats up one second of time. We re going to wrap the method up with a caching decorator so that we don t have to wait the one second every time we invoke the method. Listing 6-28. import time class Foobar(object): def slow_compute(self, *args, **kwargs): time.sleep(1) return args, kwargs, 42 Now let s cache the value using a decorator function. Our strategy is that for any function named X with some argument list, we want to create a unique name and save the final computed value to that name. We want our cached value to have a human readable name, we want to reuse the original function name, as well as the arguments that were passed in the first time. Let s get to some code! Listing 6-29. import hashlib def cache(func): """ This decorator will add a _cache_functionName_HEXDIGEST attribute after the first invocation of an instance method to store cached values. """ # Obtain the function's name func_name = func.func_name # Compute a unique value for the unnamed and named arguments arghash = hashlib.sha1(str(args) + str(kwargs)).hexdigest() cache_name = '_cache_%s_%s' % (func_name, arghash) def inner(self, *args, **kwargs): if hasattr(self, cache_name): # If we have a cached value, just use it print "Fetching cached value from : %s" % cache_name return getattr(self, cache_name) result = func(self, *args, **kwargs) setattr(self, cache_name, result) return result return inner There are only two new tricks that are in this code. 1. 2. We re using the hashlib module to convert the arguments to the function into a unique single string.

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While Listing 7-8 will find the correct IDs, most people would use the more straightforward query in Listing 7-9 to achieve the same result.

We re using getattr, hasattr, and setattr to manipulate the cached value on the instance object. The three functions getattr, setattr, and hasattr allow you to get, set, and test for attributes on an object by using string names instead of symbols. So accessing foo.bar is equivalent to invoking

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<td class="emphasis">Format:</td> <td><input name="txtFormat" type="text" size="30" maxlength="50"/></td> </tr> <tr> <td class="emphasis">Genre:</td> <td><input name="txtGenre" type="text" size="30" maxlength="50"/></td> </tr> <tr> <td class="emphasis" colspan="2"> <input type="submit" id="btnAdd" value="Add DVD"/> </td> </tr> </table> </form> </body> </html> For simplicity, I haven t added validation to the form. I m sure you re familiar with this type of page, so I won t go through an explanation. The addDVDAction.php page needs to collect the details submitted from the form and use DOM scripting to generate the new <DVD> element. The page also needs to save the updated details to the DVD.xml document. The page follows: < php $title = $_POST['txtTitle']; $format = $_POST['txtFormat']; $genre = $_POST['txtGenre']; $dom = new DomDocument(); $dom->preserveWhiteSpace = false; $dom->formatOutput = true; $dom->load("dvd.xml"); $root = $dom->documentElement; $DVDelements = $dom->getElementsByTagName("DVD"); $newID = $DVDelements->length + 1; $newDVDElement = $dom->createElement("DVD"); $newDVDElement->setAttribute("id",$newID); $newTitleElement = $dom->createElement("title"); $newTitleElement->appendChild($dom->createTextNode($title)); $newFormatElement = $dom->createElement("format"); $newFormatElement->appendChild($dom->createTextNode($format)); $newGenreElement = $dom->createElement("genre"); $newGenreElement->appendChild($dom->createTextNode($genre)); $newDVDElement->appendChild($newTitleElement); $newDVDElement->appendChild($newFormatElement); $newDVDElement->appendChild($newGenreElement); $root->appendChild($newDVDElement); $dom->save("dvd.xml"); >

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getattr(foo, bar ) In the previous case, we re using the attribute functions to bind the result of the slow calculation function into an attribute of an instance of Foobar The next time the decorated method is invoked, the hasattr test will find the cached value and we return the precomputed value Now, if we want to cache the slow method, we just throw on a @cache line above the method declaration Listing 6-30 @cache def slow_compute(self, *args, **kwargs): timesleep(1) return args, kwargs, 42 Fantastic! We can reuse this cache decorator for any method we want now Let s suppose now that we want our cache to invalidate itself after every N number of calls This practical use of currying is only a slight modification to the original caching code.

Listing 7-9. Finding IDs of Members Who Have Entered Either Tournament 24 or 40 SELECT MemberID FROM Tournament WHERE TourID = 24 OR TourID = 40

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