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  • Is HashMap in Java collision safe

    - by changed
    Hi I am developing a parser that needs to put key value pairs in hashmap. But a key can have multiple values which i can do in this way HashMap<String,ArrayList<String>> . But what happens if number of keys are very large and it start matching with other key's hashcode. Will that rewrite previous key's value ? thanks -devSunday

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  • Page Download Speed Affects Google SEO

    A slow website can often lead to a poor user experience, people don't like to sit around and wait for overweight web pages to download. If your website is serving up large photos, Flash intros or excessive graphics it can turn off your visitors and even cause you to lose customers. As you probably know this is not the best way to treat the customer and apparently now the search engines have figured this out as well.

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  • Is this query safe in SQL Server?

    - by xaw
    I have this SQL update query: UPDATE table1 SET table1.field1 = 1 WHERE table1.id NOT IN (SELECT table2.table1id FROM table2); Other portions of the application can add records to table2 which use the field table1id to reference table1. The goal here is to remove records from table1 which aren't referenced by table2. Does SQL Server automatically lock table2 with this kind of query so that a new record can't be added to table2 while executing this query? I've also considered: UPDATE table1 SET field1 = 1 WHERE 0 = (SELECT COUNT(*) FROM table2 WHERE table1.id = table2.table1id); Which seems possibly safer, but much slower (because a SELECT would be called on each row of table1 instead of just one select for the NOT IN)

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  • What's the best way to send user-inputted text via AJAX to Google App Engine?

    - by Cuga
    I'm developing in Google App Engine (python sdk) and I want to use jQuery to send an Ajax request to store an answer to a question. What is the best way to send this data to the server? Currently I have: function storeItem(question_id) { var answerInputControl = ".input_answer_"+question_id; var answer_text = $(answerInputControl).text(); $.ajax({ type: "POST", url: "store_answer.html", data: "question="+question_id, success: function(responseText){ alert("Retrieved: " + responseText); } }); } This takes a question Id and provides it to the server via the query string. But on the server-side, I'm unable to access the content of the answer control which I want to store. Without Ajax, I'm able to perform this operation with the following: class StoreAnswers(webapp.RequestHandler): def post(self): question_id = self.request.get("question_id") answer_text = self.request.get("input_answer" + question_id) But when doing this call through Ajax, my answer_text is empty. Do I need to send the contents of this control as part of the data with the Ajax request? Do I add the control itself to the query string? Its contents? Does it matter that the content might be a few hundred characters long? Is this the most-recommended practice? If sending it as a query string, what's the best way to escape the content so that a malicious user doesn't harm the system?

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  • Django + GAE (Google App Engine) : most convenient path for a beginner?

    - by mac
    Some background info first: Goal: a medium-level complexity web app that I will need to maintain and possibly extend for a few years. Experience: good knowledge of python, some experience of MVC frameworks (in PHP). Desiderata: using django and google app engine. I read extensively about the compatibility issues between GAE and Django, and I am aware of the GAE patch, the norel project, and other similar pieces of code. I have also understood that the SDK provides some of the features of django "out of the box". Yet, given that I have no previous experience with neither Django nor GAE, I am unable to evaluate to which extent using a patched version of Django will strip away important features, or how far the framework provided in the SDK is compatible with Django. So I am rather confused on what would be the best way to proceed in my situation: Should I simply use a patched version of Django as the differences with the original Django are so minor that I would hardly notice them? Should I write my app completely in "regular django" and try to port it to GAE only afterwards, when I will have got a grasp on Django internals and philosophy? Should I write my app using the framework provided with the SDK and port it to django only afterwards? Should I... ? Thank you in advance for your time and advice.

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  • Google Thoughts on Website Speed

    Improving website efficiency and speeding up response time, has become increasingly important to search engines, a majority of Internet users; and in-turn, website operators. A quick website response time, to generated requests, has been proven to encourage satisfied Internet visitors; and reduce website operating costs.

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  • How to Enable Do Not Track in Google Chrome for Increased Privacy

    - by Taylor Gibb
    The “Do Not Track” option is enabled by default in Windows 8’s Internet Explorer 10 and available in Firefox, Safari, and Opera. Notice one of the major browsers missing, like perhaps Chrome? Well it finally got the feature and we are here to show you how to enable it. 6 Ways Windows 8 Is More Secure Than Windows 7 HTG Explains: Why It’s Good That Your Computer’s RAM Is Full 10 Awesome Improvements For Desktop Users in Windows 8

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  • Is a safe accumulator really this complicated?

    - by Martin
    I'm trying to write an accumulator that is well behaved given unconstrained inputs. This seems to not be trivial and requires some pretty strict planning. Is it really this hard? int naive_accumulator(unsigned int max, unsigned int *accumulator, unsigned int amount) { if(*accumulator + amount >= max) return 1; // could overflow *accumulator += max; // could overflow return 0; } int safe_accumulator(unsigned int max, unsigned int *accumulator, unsigned int amount) { // if amount >= max, then certainly *accumulator + amount >= max if(amount >= max) { return 1; } // based on the comparison above, max - amount is defined // but *accumulator + amount might not be if(*accumulator >= max - amount) { return 1; } // based on the comparison above, *accumulator + amount is defined // and *accumulator + amount < max *accumulator += amount; return 0; }

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  • A relatively new blog seems to be getting very poor Google indexing

    - by Genadinik
    I have a new blog that is 2 months old. In the first few weeks, it was getting indexed nicely and my GoogleWebmaster reports were showing that it was getting crawled and began ranking for some terms. Then as I kept writing, the GoogleWebmaster report thinned out and showed less and less terms that this blog ranks for. Now there are only 4 terms with one of them being my name. Is there something I need to do to keep the old posts to remain indexed and crawled? Thanks, Alex

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  • Visual Source Safe New files check in

    - by rs
    I have asp files on server and i created a working folder and checked out code. I then created new files in working folder and did checkin but they new files are not copied. Does VSS do not copy new files or is there a way i can check in those files to VSS database.

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