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  • Dynamic Strategy Pattern [migrated]

    - by Karl Barker
    So I'm writing a web service architecture which includes FunctionProvider classes which do the actual processing of requests, and a main Endpoint class which receives and delegates requests to the proper FunctionProvider. I don't know exactly the FunctionProviders available at runtime, so I need to be able to 'register' (if that's the right word) them with my main Endpoint class, and query them to see if they match an incoming request. public class MyFunc implements FunctionProvider{ static { MyEndpoint.register(MyFunc); } public Boolean matchesRequest(Request req){...} public void processRequest(Request req){...} } public class MyEndpoint{ private static ArrayList<FunctionProvider> functions = new ArrayList<FunctionProvider>(); public void register(Class clz){ functions.add(clz); } public void doPost(Request request){ //find the FunctionProvider in functions //matching the request } } I've really not done much reflective Java like this (and the above is likely wrong, but hopefully demonstrates my intentions). What's the nicest way to implement this without getting hacky?

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  • AngularJS dealing with large data sets (Strategy)

    - by Brian
    I am working on developing a personal temperature logging viewer based on my rasppi curl'ing data into my web server's api. Temperatures are taken every 2 seconds and I can have several temperature sensors posting data. Needless to say I will have a lot of data to handle even within the scope of an hour. I have implemented a very simple paging api from the server so the server doesn't timeout and is currently only returning data in 1000 units per call, then paging through the data. I had the idea to intially show say the last 20 minutes of data from a sensor (or all sensors depending on user choices), then allowing the user to select other timeframes from which to show data. The issue comes in when you want to view all sensors or an extended time period (say 24 hours). Is there a best practice of handling this large amount of data? Would it be useful to load those first 20 minutes into the live view and then cache into local storage something like the last 24 hours? I haven't been able to find a decent idea of this in use yet even though there are a lot of ways to take this problem. I am just looking for some suggestions as to what might provide a good balance between good performance and not caching the entire data set on the client side (as beyond a week of data this might not be feasible).

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  • Strategy to store/average logs of pings

    - by José Tomás Tocino
    I'm developing a site to monitor web services. The most basic type of check is sending a ping, storing the response time in a CheckLog object. By default, PingCheck objects are triggered every minute, so in one hour you get 60 CheckLogs and in one day you get 1440 CheckLogs. That's a lot of them, I don't need to store such level of detail, so I've set a up collapsing mechanism that periodically takes the uncollapsed CheckLogs older than 24h and collapses (averages) them in intervals of 30 minutes. So, if you have 360 CheckLogs that have been saved from 0:00 to 6:00, after collapsing you retain just 12 of them. The problem.. well, is this: After averaging the response times, the graph changes drastically. What can I do to improve this? Guess one option could be narrowing the interval duration to 15 min. I've seen the graphs at the GitHub status page and they do not seem to suffer from this problem. I'd appreciate any kind of information you could give me about this area.

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  • Trying to retrace our SEO domain redirect strategy

    - by dans
    An SEO built a copy of my company's e-commerce site on another domain that contained our product's keywords in the name (i.e. as if Levi's built a duplicate site on bluejeans.com)...and then they referenced a lot of the images on the actual website from the other domain (as if Levis.com had images on it referenced like: img src="http://www.bluejeans.com/jeans-front.jpg"), but when you tried to reach the site by typing the name into the browser you would be redirected to the regular website, so the site wasn't really used for any purpose except I guess SEO. Since I didn't think this was doing anything GOOD for us at the time, I deleted the duplicate site and let the hosting on it expire, only to watch our search engine position rankings fall dramatically. Any ideas as to what was going on there? I want to get it back to understand its impact, but I don't know how it was set up. I contacted our host and they have no idea how it was set up. I suspect there was some sort of redirect in play, or something?

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  • SEO Content - A Major Part of Your SEO Strategy

    Search Engine Optimization is a dynamic process and it involves a lot of factors that can be broadly be divided into on page and off page factors. Among the on page factors the content that is presented on the web page plays a very significant role in the determination of the rank of that page. With the right kind of SEO content you can increase the relevance of the page for the search engine thus making it rank higher for that particular keyword.

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  • SEO Strategy - Building One Way Links

    One way links are integral to search engine optimization (SEO). They tell the search engines, "Hey this website is interesting!" Now that you know developing links is important, how do you go about doing it? There are several different ways to go about link building. No one link building scheme will get a blog or website listed high enough in the Google rankings to earn money. You must diversify and use many different approaches to obtain one way links.

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  • Tips For a Successful Link Building Strategy

    If you want to become a successful online marketer and want to make your online marketing campaign successful, you will need to work on building backlinks for your website. Link building will decide the failure or the success of your online marketing campaign.

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  • Implementing an SEO Strategy - SEO Training For Small Businesses

    Investing in internet marketing is no longer an option it's a necessity. Search engine optimisation SEO is the first step taken by many businesses to make sure their website is visible on Google. Once you've decided to undertake an SEO campaign you have to consider how you will implement this within your organisation. Your first decision then will be whether to outsource your SEO to an external agency or to invest in SEO training.

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  • Create a Web Presence Using SEO Strategy

    Creating a website that will promote your business is an effective marketing tool. With proper knowledge of Search Engine Optimization through effective SEO Training, you can definitely reach a top spot ranking in search engines.

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  • SEO - The Most Important Aspect of Internet Marketing Strategy

    Your online visibility and trafficking can be improved by SEO which means Search Engine Optimization. It's a process of improving the quality or traffic to your website or web page. This active practice of changing and optimizing internal as well as external aspects in order to increase the traffic and hits on your website or web page is called optimizing your search result.

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  • SEO (Search Engine Optimization) - The Web's Leading Internet Marketing Strategy

    According to the Google logs, Google, the most used search engine in the US, has over 2 billion searches a day and has dramatically decreased the use of a phone book. Fact is that, the internet has changed the way we experience advertising and many businesses have not taken advantage of it yet, especially SEO. But what is search engine optimization and how can you take advantage of it?

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  • Any software for pattern-matching and -rewriting source code?

    - by Steven A. Lowe
    I have some old software (in a language that's not dead but is dead to me ;-)) that implements a basic pattern-matching and -rewriting system for source code. I am considering resurrecting this code, translating it into a modern language, and open-sourcing the project as a refactoring power-tool. Before I go much further, I want to know if anything like this exists already (my google-fu is fanning air on this tonight). Here's how it works: the pattern-matching part matches source-code patterns spanning multiple lines of code using a template with binding variables, the pattern-rewriting part uses a template to rewrite the matched code, inserting the contents of the bound variables from the matching template matching and rewriting templates are associated (1:1) by a simple (unconditional) rewrite rule the software operates on the abstract syntax tree (AST) of the input application, and outputs a modified AST which can then be regenerated into new source code for example, suppose we find a bunch of while-loops that really should be for-loops. The following template will match the while-loop pattern: Template oldLoopPtrn int @cnt@ = 0; while (@cnt@ < @max@) { … @body@ ++@cnt@; } End_Template while the following template will specify the output rewrite pattern: Template newLoopPtrn for(int @cnt@ = 0; @cnt@ < @max@; @cnt@++) { @body@ } End_Template and a simple rule to associate them Rule oldLoopPtrn --> newLoopPtrn so code that looks like this int i=0; while(i<arrlen) { printf("element %d: %f\n",i,arr[i]); ++i; } gets automatically rewritten to look like this for(int i = 0; i < arrlen; i++) { printf("element %d: %f\n",i,arr[i]); } The closest thing I've seen like this is some of the code-refactoring tools, but they seem to be geared towards interactive rewriting of selected snippets, not wholesale automated changes. I believe that this kind of tool could supercharge refactoring, and would work on multiple languages (even HTML/CSS). I also believe that converting and polishing the code base would be a huge project that I simply cannot do alone in any reasonable amount of time. So, anything like this out there already? If not, any obvious features (besides rewrite-rule conditions) to consider? EDIT: The one feature of this system that I like very much is that the template patterns are fairly obvious and easy to read because they're written in the same language as the target source code, not in some esoteric mutated regex/BNF format.

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  • Matrix Pattern Recognition Algorithm

    - by Andres
    I am designing a logic analyzer and I would like to implement some Matrix Algorithm. I have several channels each one represented by a row in the matrix and every element in the column would be the state, for example: Channel 1 1 0 0 1 0 1 1 0 1 Channel 2 1 1 0 1 1 0 0 1 1 Channel 3 0 1 0 1 1 0 1 0 0 Channel 4 0 0 1 0 0 1 0 0 1 I would like to detect a pattern inside my matrix for example, detect if exist and where the sub-matrix or pattern: 1 0 1 1 I think it can be accomplished testing element by element but I think there should be a better way of doing it. Is there any Java API or any way to do it ? If there is a API ARM optimized for NEON instructions would be great also but not mandatory. Thank you very much in advance.

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