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  • Interconnect nodes in a Java distributed infrastructure for tweet processing

    - by David Moreno García
    I'm working in a new version of an old project that I used to download and process user statuses from Twitter. The main problem of that project was its infrastructure. I used multiple instances of a java application (trackers) to download from Twitter given an specific task (basically terms to search for), connected with a central node (a web application) that had to process all tweets once per day and generate a new task for each trackers once each 15 minutes. The central node also had to monitor all trackers and enable/disable them under user petition. This, as I said, was too slow because I had multiple bottlenecks, so in this new version I want to improve the infrastructure and isolate all functionalities in specific nodes. I also need a good notification system to receive notifications for any node. So, in the next diagram I show the components that I'll need in this new version: As you can see, there are more nodes. Here are some notes about them: Dashboard: Controls trackers statuses and send a single task to each of them (under user request). The trackers will use this task until replaced with a new one (if done, not each 15 minutes like before). Search engine: I need to store all the tweets. They are firstly stored in a local database for each tracker but after that I'm thinking on using something like Elasticsearch to be able to do fast searches. Tweet processor: Just and isolated component with its own database (maybe something like the search engine to have fast access to info generated by the module). In the future more could be added. Application UI: A web application with a shared database with the Dashboard (mainly to store users information and preferences). Indeed, both could be merged into a single web. The main difference with the previous version of the project is that now they will be isolated and they will only show information and send requests. I will not do any heavy task in them (like process tweets as I did before). So, having this components, my main headache is how to structure all to not have to rewrite a lot of code every time I need to access any new data. Another headache is how can I interconnect nodes. I could use sockets but that is a pain in the ass. Maybe a REST layer? And finally, if all the nodes are isolated, how could I generate notifications for each user which info is only in the database used by the Application UI? I'm programming this using Java and Spring (at least I used them in the last version) but I have no problems with changing the language if I can take advantage of a tool/library/engine to make my life easier and have a better platform. Any comment will be appreciated.

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  • ANTS Memory Profiler 7.0

    - by Sam Abraham
    In the next few lines, I would like to briefly review ANTS Memory Profiler 7.0.  I was honored to be extended the opportunity to review this valuable tool as part of the GeeksWithBlogs influencers Program, a quarterly award providing its recipients access to valuable tools and enabling them with an opportunity to provide a brief write-up reviewing the complimentary tools they receive.   Typical Usage   ANTS Memory Profiler 7.0 is very intuitive and easy to use for any user be it novice or expert. A simple yet comprehensive menu screen enables the selection of the appropriate program type to profile as well as the executable or site for this program.   A typical use case starts with establishing a baseline memory snapshot, which tells us the initial memory cost used by the program under normal or low activity conditions. We would then take a second snapshot after the program has performed an activity which we want to investigate for memory leaks. We can then compare the initial baseline snapshot against the snapshot when the program has completed processing the activity in question to study anomalies in memory that did not get freed-up after the program has completed its performed function. The following are some screenshots outlining the selection of the program to profile (an executable for this demonstration’s purposes).   Figure 1 - Getting Started   Figure 2 - Selecting an Application to Profile     Features and Options   Right after the second snapshot is generated, Memory Profiler gives us immediate access to information on memory fragmentation, size differences between snapshots, unmanaged memory allocation and statistics on the largest classes taking up un-freed memory space.   We would also have the option to itemize objects held in memory grouped by object types within which we can study the instances allocated of each type. Filtering options enable us to quickly narrow object instances we are interested in.   Figure 3 - Easily accessible Execution Memory Information   Figure 4 - Class List   Figure 5 - Instance List   Figure 6-  Retention Graph for a Particular Instance   Conclusion I greatly enjoyed the opportunity to evaluate ANTS Memory Profiler 7.0. The tool's intuitive User Interface design and easily accessible menu options enabled me to quickly identify problem areas where memory was left unfreed in my code.     Tutorials and References  FInd out more About ANTS Memory Profiler 7.0 http://www.red-gate.com/supportcenter/Product?p=ANTS Memory Profiler   Checkout what other reviewers of this valuable tool have already shared: http://geekswithblogs.net/BlackRabbitCoder/archive/2011/03/10/ants-memory-profiler-7.0.aspx http://geekswithblogs.net/mikebmcl/archive/2011/02/28/ants-memory-profiler-7.0-review.aspx

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  • Fetch as Google error 403

    - by Bojan Vidanovic
    2 weeks ago, google cant access my website anymore, in webmaster tools i cant fetch any page, i always get error 403, and the website has been completly disapperard form the google search results. I cant figure how suddendly it cant see it anymore, i've checked .htaccess and there nothing that blocks google crawlers, and robots.txt is fine to. Anyway the site is accesibly normaly for users. Anyone had this problems? please help!

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  • Can I upgrade Lucid to Precise with the 12.04.1 desktop image?

    - by rahmad ars
    I am running Ubuntu Lucid and would like to upgrade to Precise, using the normal ubuntu-12.04.1-desktop-...iso image. So far I have tried upgrading with the CD but was not given the choice. Searching on the internet, I have found upgrading using the ubuntu-12.04.1-alternate-...iso image works, but I don't have great internet access. Is upgrading from Lucid possible, with the ubuntu-12.04.1-desktop image?

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  • What are the drawbacks of sending XML to browsers and let them apply XSLT?

    - by MainMa
    Context Working as a freelance developer, I often made websites completely based on XSLT. In other words, on every request, an XML file is generated, containing everything we need to know about the page content: the name of the user currently logged in, the top menu entries, if this menu is dynamic/configurable, the text to display in a specific area of the page, etc. Then XSL process (caches, etc.) it to HTML/XHTML page to send to the browser. It has a good point to make it easier to create small-scale websites, especially with PHP. It is a sort of template engine, but which I prefer to other template engines because it's much more powerful than most of template engines, and because I know it better and like it. It is also possible, when need, to give an access to raw XML data on demand for an automated access, without the need to create separate APIs. Of course, it will fail completely on any medium-scale or large-scale website, since, even with good caching techniques, XSL still degrades overall website performance and requires more CPU serverside. Question Modern browsers have the ability to take an XML file and to transform it with an associated XSL file declared in XML like <?xml-stylesheet href="demo.xslt" type="text/xsl"?>. Firefox 3 can do it. Internet Explorer 8 can do it too. It means that it is possible to migrate XSL processing from the server to the client side for 50% of users (according on browser statistics on several websites where I may want to implement this). It means that those 50% of users will receive only the XML file at each request, thus reducing their and server's bandwidth (XML file being much shorter than its processed HTML analog), and reducing server's CPU usage. What are the drawbacks of this technique? I thought about several ones, but it doesn't apply in this situation: Difficult implementation and the need to choose, based on the browser request, when to send raw XML and when to transform it to HTML instead. Obviously, the system will not be much more difficult then the actual one. The only change to make is to add XSL file link to every XML, and to add a browser check. More IO and bandwidth usage, since the XSLT file will be downloaded by the browsers, instead of being cached by the server. I don't think it will be a problem, since XSLT file will be cached by the browsers (like images, or CSS, or JavaScript files are cached actually). Possibly some problems on client side, like maybe problems when saving a page in some browsers. Difficulty to debug code: it is impossible to obtain an HTML source the browser is actually using, since the only displayed source is the downloaded XML. On the other hand, I rarely go look at HTML code on client side, and in most cases, it is unusable directly (whitespace being removed).

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  • Besxt Text-to-Speech Solution for my Website

    - by Tim Marshall
    I'm working on the 'Ease of Access' section of my website with the options to increase the font-size displayed on pages to a minimum, invert colours and whatnot. I wish to implement a plugin which, if enabled by the user, to read content on my website. Presumably my best option is a website plugin, however there might be some programming I've not come across which allows the likes of PHP to read content. I'm not entirely sure how this all works. Best Regards, Tim

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  • I'm trying to understand hash tables - can someone explain it to me - clearly?

    - by Stevo
    I want to understand the correct use and implementation of hash tables in php (sorry). I read somewhere that an in-experienced programmer created a hash table and then iterated through it. Now, I understand why that is wrong but I haven't quite got the full knowledge to know if my understanding is correct (if you know what I mean). So could someone explain to me how to implement a hash table in php (presumably an associative array) and perhaps more importantly, how to access the values 'with a hash' and what that actually means?

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  • Google I/O 2012 - New Low-Level Media APIs in Android

    Google I/O 2012 - New Low-Level Media APIs in Android Dave Burke Jellybean introduces a new set of powerful low-level media APIs that provide developers with the ability to access hardware codecs directly from Java. This session introduces the new APIs with examples. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 0 0 ratings Time: 01:05:50 More in Science & Technology

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  • folder level 301 redirect without .htaccess

    - by Vinay
    I have a website hosted in yahoo small business, I don't have access to .htaccess file. I have around 220 pages in a folder 'mysubfolder' (http://mysite.com/myfolder/mysubfolder). And the age of website is around 3 years. I am planning to move all 220 pages in 'mysubfolder' to 'myfolder' (one level up). All the pages in 'mysubfolder' are indexed. what is the best way to do this.So that it should not affects the SEO.

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  • Best way to provide folder level 301 redirect

    - by Vinay
    I have a website hosted in yahoo small business, I don't have access to .htaccess file. I have around 220 pages in a folder 'mysubfolder' (http://mysite.com/myfolder/mysubfolder). And the age of website is around 3 years. I am planning to move all 220 pages in 'mysubfolder' to 'myfolder' (one level up). All the pages are under 'mysubfolder' are indexed. what is the best way to do this.So that it should not affects the SEO.

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  • ASP.NET 4.0 and the Entity Framework 4 - Part 4 - A 3 Layered Approach to the Entity Framework

    In this article, Vince suggests a pattern to use when developing a three layered application using the Entity Framework 4. After providing a short introduction he demonstrates the creation of the database, data access layer, business logic layer, and a web form. He does so with the help of detailed explanations, source code examples and related screenshots. He also examines how to select records to load a Drop Down List, including adding, editing and deleting records.

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  • How to mount ext4 partition?

    - by Flint
    How do I mount an ext4 partition as my user account so I wouldn't require root access to r/w on it? I used -o uid=flint,gid=flint on the mount command but I keep getting mount: wrong fs type, bad option, bad superblock on /dev/sda7, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so Another thing, I want avoid using udisks for now as it doesn't let me mount to my specified mount point name.

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  • Questions About Oracle Solaris 11 ? Join The Expert Live Chat !

    - by Markus Weber
    Our recent Oracle Solaris Online Forum was quite popular, especially in the number of questions that have been asked, and answered.In case you missed it, make sure to watch the replay(s). Considering that the sheer amount of questions we got during this event, we decided to listen to you again, and give you direct access to several senior Oracle Solaris engineers and product managers, by joining our Oracle Solaris 11 TechTarget Live Chat - June 27, 8am - 11am PT Register Today ! Senior engineers confirmed so far are: Bart Smaalders, Dave Miner, Nicolas Droux, David Comay

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  • How to change root password for mysql and phpmyadmin

    - by Jon
    I've set up mysql and phpmyadmin and chose not to set a password when installing hoping that once set up i could login with root and no password but i get the following error from phpmyadmin Login without a password is forbidden by configuration (see AllowNoPassword) I have previously moved the phpmyadmin folder to /var/www/ I have tried changing the following line $cfg['Servers'][$i]['AllowNoPassword'] = false; to $cfg['Servers'][$i]['AllowNoPassword'] = true; but still had no success, so i am wondering is there a way i can change the root passwords for both so i can access phpmyadmin and create databases. Thanks

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  • Google I/O 2012 - New Low-Level Media APIs in Android

    Google I/O 2012 - New Low-Level Media APIs in Android Dave Burke Jellybean introduces a new set of powerful low-level media APIs that provide developers with the ability to access hardware codecs directly from Java. This session introduces the new APIs with examples. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 470 15 ratings Time: 01:05:50 More in Science & Technology

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  • Introducing Exam Preparation Seminars on iPad

    - by Brandye Barrington
    Oracle University announced last week, the availability of the new Oracle Training On Demand app for iPad. This means that Oracle Certification's Exam Preparation Seminars, which are in the Training On Demand format are conveniently available for viewing on your iPad. The app is supplemental to the Web browser version. Features include: Access to your Oracle Training On Demand course titles High-quality video playback Video download and offline playback Interactive Table of Contents Course search Ability to search and preview available courses The app is available for free on the Apple App Store.

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  • Where should I store 3rd party jar (Java archive) files?

    - by Martijn
    Hi folks, What would be the best place to save jar files of libraries I want to use in a project, that are not in any repositories, and how should I set permissions? Should I put them in /usr/share/java, or is it better to store them somewhere in my home folder? What would be the most usefull access rights? Does it make sense to follow the convention in /usr/share/java of making a symlink with the package name to the specific version of the jar, and follow the permissions as used there?

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  • How to Easily Watch Netflix and Hulu From Anywhere in the World

    - by Taylor Gibb
    Ever wanted to access an online web service, only to find it’s only available to those people living in the United States? Read on to find out how you can get around this restriction by changing one simple setting in Windows. How to Banish Duplicate Photos with VisiPic How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It?

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  • Java 1.7 update 07 and Google Chrome

    - by Peter
    I've just updated Java from 1.6 to 1.7 via the Software Centre - removing the old Java 1.6 and selecting the new Java 1.7. Firefox works fine. But when I use Google Chrome to access a Java test website it says the Plugin is out of date. I click on run anyway and it says that it's running version 1.7. I've cleared Chrome's Cache and Plugin data and this hasn't changed anything. Anyway ideas? (Ps. It's Ubuntu 12.04 64 bit)

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  • unable to mount hard drives

    - by mixtyplix
    I am currently trying to backup data from my computer's hard drive to an external one while live-booting to Ubuntu from a USB, and I've encountered a bit of a problem. You see, I cannot mount my hard drives. Whenever I try, I always get one of two errors: fuse: failed to access mountpoint [file I'm trying to mount to]: No such file or directory or Error mounting: mount exited with exit code 21: mount: according to mtab, [drive] is already mounted on [file I'm trying to mount to] How can I fix this?

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  • Simplifying Human Capital Management with Mobile Applications

    - by HCM-Oracle
    By Aaron Green If you're starting to think 'mobility' is a recurring theme in your reading, you'd be right. For those who haven't started to build organisational capabilities to leverage it, it's fair to say you're late to the party. The good news: better late than never. Research firm eMarketer says the worldwide smartphone audience will total 1.75 billion this year, while communications technology and services provider Ericsson suggests smartphones will triple to 5.6 billion globally by 2019. It should be no surprise, smart phone adoption is reaching the farthest corners of the globe; the subsequent impact of enterprise applications enabled by these devices is driving business performance improvement and will continue to do so. Companies using advanced workforce analytics can add significantly to the bottom line, while impacting customer satisfaction, quality and productivity. It's a statement that makes most business leaders sit forward in their chairs. Achieving these three standards is like sipping The Golden Elixir for the business world. No-one would argue their importance. So what are 'advanced workforce analytics?' Simply, they're unprecedented access to workforce trends and performance markers. Many are made possible by a mobile world and the enterprise applications that come with it on smart devices. Some refer to it as 'the consumerisation of IT'. As this phenomenon has matured and become more widely appreciated it has impacted the spectrum of functional units within an enterprise differently, but powerfully. Whether it's sales, HR, marketing, IT, or operations, all have benefited from a more mobile approach. It has been the catalyst for improvement in, and management of, the employee experience. The net result of which is happier customers. The obvious benefits but the lesser realised impact Most people understand that mobility allows for greater efficiency and productivity, collaboration and flexibility, but how that translates into business outcomes within the various functional groups is lesser known. In actuality mobility has helped galvanise partnerships between cross-functional groups within the enterprise. Where in some quarters it was once feared mobility could fragment a workforce, its rallying cry of support is coming from what you might describe as an unlikely source - HR. As the bedrock of an enterprise, it is conceivable HR might contemplate the possible negative impact of a mobile workforce that no-longer sits in an office, at the same desks every day. After all, who would know what they were doing or saying? How would they collaborate? It's reasonable to see why HR might have a legitimate claim to try and retain as much 'perceived control' as possible. The reality however is mobility has emancipated human capital and its management. Mobility and enterprise applications are expediting decision making. Google calls it Zero Moment of Truth, or ZMOT. It enables smoother operation and can contribute to faster growth. From a collaborative perspective, with the growing use of enterprise social media, which in many cases is being driven by HR, workforce planning and the tangible impact of change is much easier to map. This in turn provides a platform from which individuals and teams can thrive. With more agility and ability to anticipate, staff satisfaction and retention is higher, and real time feedback constant. The management team can save time, energy and costs with more accurate data, which is then intelligently applied across the workforce to truly engage with staff, customers and partners. From a human capital management (HCM) perspective, mobility can help you close the loop on true talent management. It can enhance what managers can offer and what employees can provide in return. It can create nested relationships and powerful partnerships. IT and HR - partners and stewards of mobility One effect of enterprise mobility is an evolution in the nature of the relationship between HR and IT from one of service provision to partnership. The reason for the dynamic shift is largely due to the 'bring your own device' (BYOD) movement, which is transitioning to a 'bring your own application' (BYOA) scenario. As enterprise technology has in some ways reverse-engineered its solutions to help manage this situation, the partnership between IT (the functional owner) and HR (the strategic enabler) is deeply entrenched. And it has to be. The CIO and the HR leader are faced with compliance and regulatory issues and concerns around information security and personal privacy on a daily basis, complicated by global reach and varied domestic legislation. There are tens of thousands of new mobile apps entering the market each month and, unlike many consumer applications which get downloaded but are often never opened again after initial perusal, enterprise applications are being relied upon by functional groups, not least by HR to enhance people management. It requires a systematic approach across all applications in use within the enterprise in order to ensure they're used to best effect. No turning back, and no desire to With real time analytics on performance and the ability for immediate feedback, there is no turning back for managers. In my experience with Oracle, our customers' operational efficiency is at record levels. It's clear as a result of the combination of individual KPIs and organisational goals, CIOs have been able to give HR leaders the ability to build predictive models that feed into an enterprise organisations' evolving strategy. It also helps them ensure regulatory compliance much more easily. Once an arduous task, with mobile enabled automation and quality data, compliance is simpler. Their world has changed for the better. For the CIO, mobility also assists them to optimise performance. While it doesn't come without challenges, mobile-enabled applications and the native experience users have with them means employees don't need high-level technical expertise to train users. It reduces the training and engagement required from the IT team so they can focus on other things that deliver value to the bottom line; all the while lowering the cost of assets and related maintenance work by simplifying processes. Rewards of a mobile enterprise outweigh risks With mobile tools allowing us to increasingly integrate our personal and professional lives, terms like "office hours" are becoming irrelevant, so work/life balance is a cultural must. Enterprises are expected to offer tools that enable workers to access information from anywhere, at any time, from any device. Employees want simplicity and convenience but it doesn't stop at private enterprise. This is a societal shift. Governments, which traditionally have been known to be slower to adopt newer technology, are also offering support for local businesses to go mobile. Several state government websites have advice on how to create mobile apps and more. And as recently as last week the Victorian Minister for Technology Gordon Rich-Phillips unveiled his State government's ICT roadmap for the next two years, which details an increased use of the public cloud, as well as mobile communications, and improved access to online data-sets. Tech giants are investing significantly in solutions designed to simplify mobile deployment and enablement. The mobility trend is creating a wave of change in the industry and driving transformation in the enterprise. If you're not on that wave, the business risk continues to rise as your competitiveness drops. Aaron is the Vice President of HCM Strategy at Oracle Corporation where he is responsible for researching and identifying emerging trends in the practice of Human Resources and works to deliver industry-leading technology solutions. Other responsibilities include, ownership of Oracle's innovative HCM solutions across JAPAC and enabling organisations to transform and modernise their workforce tools. Follow him on Twitter @aaronjgreen

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