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• JMX Based Monitoring - Part Two - JVM Monitoring

  - by Anthony Shorten

  This the second article in the series focussing on the JMX based monitoring capabilities possible with the Oracle Utilities Application Framework. In all versions of the Oracle utilities Application Framework, it is possible to use the basic JMX based monitoring available with the Java Virtual Machine to provide basic statistics ablut the JVM. In Java 5 and above, the JVM automatically allowed local monitoring of the JVM statistics from an approporiate console. When I say local I mean the monitoring tool must be executed from the same machine (and in some cases the same user that is running the JVM) to connect to the JVM directly. If you are using jconsole, for example, then you must have access to a GUI (X-Windows or Windows) to display the jconsole output. This is the easist way of monitoring without doing too much configration but is not always practical. Java offers a remote monitorig capability to allow yo to connect to a remotely executing JVM from a console (like jconsole). To use this facility additional JVM options must be added to the command line that started the JVM. Details of the additional options for the version of the Java you are running is located at the JMX information site. Typically to remotely connect to a running JVM that JVM must be configured with the following categories of options: JMX Port - The JVM must allow connections on a listening port specified on the command line Connection security - The connection to the JVM can be secured. This is recommended as JMX is not just a monitoring protocol it is a managemet protocol. It is possible to change values in a running JVM using JMX and there are NO "Are you sure?" safeguards. For a Oracle Utilities Application Framework based application there are a few guidelines when configuring and using this JMX based remote monitoring of the JVM's: Online JVM - The JVM used to run the online system is embedded within the J2EE Web Application Server. To enable JMX monitoring on this JVM you can either change the startup script that starts the Web Application Server or check whether your J2EE Web Application natively supports JVM statistics collection. Child JVM's (COBOL only) - The Child JVM's should not be monitored using this method as they are recycled regularly by the configuration and therefore statistics collected are of little value. Batch Threadpoools - Batch already has a JMX interface (which will be covered in another article). Additional monitoring can be enabled but the base supported monitoring is sufficient for most needs. If you are an Oracle Utilities Application Framework site, then you can specify the additional options for JMX Java monitoring on the OPTS paramaters supported for each component of the architecture. Just ensure the port numbers used are unique for each JVM running on any machine.

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• Constraint-based expert systems design and development [on hold]

  - by Alex B.

  I would appreciate some recommendations & resources on design and development of expert systems, in particular, knowledge-based & constraint-based (not recommendation) systems. Ideally, your answers should consider the perspective (context) of using a SaaS business model and open source rules engine. How would you advise to address performance, scalability and other architectural criteria? Any other considerations on undertaking such project will be appreciated. Thanks much in advance!

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• Static site generator with web-based file manager?

  - by user234

  I'm checking around options of static web site generators which led me to lots of articles about them! However, no word is spoken on how to edit files through a browser; it's always assumed you have either DropBox or some FTPish or terminal access. The only generator I could find that includes a browser based admin screen is Kirby (getkirby.com, mentioned at modernstatic.com) Besides the application above, what setup would you recommend to have both static HTML generation and web-based file management? Thanks!

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• Linux based audio prodcuction tutorials

  - by thelinuxer

  I have been searching for a while for Linux based audio production tutorials. All I can find is tool based tutorials. For example I found tutorials on how to use jack, ardour, lmms ..etc. What I need is tutorials that teaches professional audio production with opensource/free tools, like those already available for protools and likes. If any one can guide me to any videos/articles available it would be highly appreciated. Thanks.

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• Need help in using hadoop in a Spring-Hibernate-JPA based web application [closed]

  - by John Varghese

  Possible Duplicate: Need help in using hadoop framework in a Spring-Hibernate-JPA based web application We are developing a Spring-Hibernate-JPA based web application which uses MySql as the database for storage and retrieval. We need to store and compute huge amounts of data, for that we need to use hadoop framework. How hadoop framework can be used in our web application to store and compute huge amounts of data?

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• Trial Marketing and SEO For Your Home Based Business Opportunity

  Home based business opportunities can be run more efficiently if you use free resources to check keywords. A legitimate home business takes work to achieve and with these tools to optimize search engine optimization (SEO) a home based business idea can become a very strong Internet home business.

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• RegEx-Based Finding and Replacing of Text in SSMS

  So often, one sees developers doing repetitive coding in SQL Server Management Studio or Visual Studio that could be made much quicker and easier by using the Regular-Expression-based Find/Replace functionality. It is understandable, since the syntax is odd and some features are missing, but it is still worth knowing about. The Future of SQL Server Monitoring "Being web-based, SQL Monitor 2.0 enables you to check on your servers from almost any location" Jonathan Allen.Try SQL Monitor now.

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• Desktop Software to monitor online status of web site and web-based application

  - by pansp

  I'm basically looking for a desktop-based software which can monitor my company's website and the web application's online availability. I know there are few online applications like Uptime Robot which does the same work but I have been asked to find a desktop based software which can monitor running in system tray and notify any down-time. A free software would be great. Any help would be appreciated. Thanks!

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• 5 Firefox Based Browsers You Probably Haven't Seen Before

  <b>Tech Drive-In:</b> "Light the world with Firefox video is a nice depiction of Firefox through the years. But how many of you actually knew that there are a number of Firefox based browsers which are as good or oven better than Firefox? Here is a list of 5 Firefox based browsers you should know."

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• Relevance of Performance Based SEO Services

  It was an interesting conversation between a Search Engine Optimization (SEO) business development person and a prospective customer. The prospective customer had scoffed at the SEO person's sales pitch about them offering "Performance Based SEO Services", saying Performance Based Services of any kind in life is not a luxury but a fundamental requirement.

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• Sum multi dimensional array based on a key in php

  - by user1328178

  I have mutiple arrays say for now 2, first array has Cities(Mumbai, Pune. Bangalore, Hyderabad) And 2nd array has Mumbia nad Hyderabd. I want to sum up the values based on the Key. Array ( [Mumbai] = Array ( [ga:pageviews] = 1 [ga:visits] = 1 [ga:newVisits] = 1 [ga:pageviewsPerVisit] = 1 [ga:entranceBounceRate] = 1 [ga:avgTimeOnSite] = 1 [ga:timeOnSite] = 1 [ga:bounces] = 1 ) [Pune] => Array ( [ga:pageviews] => 2 [ga:visits] => 2 [ga:newVisits] => 2 [ga:pageviewsPerVisit] => 2 [ga:entranceBounceRate] => 2 [ga:avgTimeOnSite] => 2 [ga:timeOnSite] => 2 [ga:bounces] => 2 ) [Bangalore] => Array ( [ga:pageviews] => 3 [ga:visits] => 3 [ga:newVisits] => 3 [ga:pageviewsPerVisit] => 3 [ga:entranceBounceRate] => 3 [ga:avgTimeOnSite] => 3 [ga:timeOnSite] => 3 [ga:bounces] => 3 ) [Hyderabad] => Array ( [ga:pageviews] => 4 [ga:visits] => 4 [ga:newVisits] => 4 [ga:pageviewsPerVisit] => 4 [ga:entranceBounceRate] => 4 [ga:avgTimeOnSite] => 4 [ga:timeOnSite] => 4 [ga:bounces] => 4 ) ) 2nd Array: Array ( [Mumbai] = Array ( [ga:pageviews] = 5 [ga:visits] = 5 [ga:newVisits] = 5 [ga:pageviewsPerVisit] = 5 [ga:entranceBounceRate] = 5 [ga:avgTimeOnSite] = 5 [ga:timeOnSite] = 5 [ga:bounces] = 5 ) [Hyderabad] => Array ( [ga:pageviews] => 2 [ga:visits] => 2 [ga:newVisits] => 2 [ga:pageviewsPerVisit] => 2 [ga:entranceBounceRate] => 2 [ga:avgTimeOnSite] => 2 [ga:timeOnSite] => 2 [ga:bounces] => 2 ) ) I want the result as: Array ( [Mumbai] = Array ( [ga:pageviews] = 6 [ga:visits] = 6 [ga:newVisits] = 6 [ga:pageviewsPerVisit] = 6 [ga:entranceBounceRate] = 6 [ga:avgTimeOnSite] = 6 [ga:timeOnSite] = 6 [ga:bounces] = 6 ) [Pune] => Array ( [ga:pageviews] => 2 [ga:visits] => 2 [ga:newVisits] => 2 [ga:pageviewsPerVisit] => 2 [ga:entranceBounceRate] => 2 [ga:avgTimeOnSite] => 2 [ga:timeOnSite] => 2 [ga:bounces] => 2 ) [Bangalore] => Array ( [ga:pageviews] => 3 [ga:visits] => 3 [ga:newVisits] => 3 [ga:pageviewsPerVisit] => 3 [ga:entranceBounceRate] => 3 [ga:avgTimeOnSite] => 3 [ga:timeOnSite] => 3 [ga:bounces] => 3 ) [Hyderabad] => Array ( [ga:pageviews] => 6 [ga:visits] => 6 [ga:newVisits] => 6 [ga:pageviewsPerVisit] => 6 [ga:entranceBounceRate] => 6 [ga:avgTimeOnSite] => 6 [ga:timeOnSite] => 6 [ga:bounces] => 6 ) ) Thanks for your help.... Ruth.

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• Why does the definition of Array.map in Scala is "throw new Error()"

  - by Oscar Reyes

  The source code of map for Array is: override def map[B](f: A => B): Array[B] = throw new Error() But the following works: scala> val name : Array[String]= new Array(1) name: Array[String] = Array(null) scala> name(0)="Oscar" scala> val x = name.map { ( s: String ) => s.toUpperCase } x: Array[java.lang.String] = Array(OSCAR)

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• PHP $array[0] in $string for JSON

  - by user1907696

  I am trying to use PHP to make a JSON file. Part of the code is as follow $array = array("hello", "world"); $string='{"person": [ { "name":'$array[0];', "age":'$array[1];' } ] }'; The file created. However, $array[0] and $array[1] doesn't return the values "hello" and "world" but as $array[0] and $array[1] Any idea? Thanks

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• Token based Authentication for WCF HTTP/REST Services: Authorization

  - by Your DisplayName here!

  In the previous post I showed how token based authentication can be implemented for WCF HTTP based services. Authentication is the process of finding out who the user is – this includes anonymous users. Then it is up to the service to decide under which circumstances the client has access to the service as a whole or individual operations. This is called authorization. By default – my framework does not allow anonymous users and will deny access right in the service authorization manager. You can however turn anonymous access on – that means technically, that instead of denying access, an anonymous principal is placed on Thread.CurrentPrincipal. You can flip that switch in the configuration class that you can pass into the service host/factory. var configuration = new WebTokenWebServiceHostConfiguration {     AllowAnonymousAccess = true }; But this is not enough, in addition you also need to decorate the individual operations to allow anonymous access as well, e.g.: [AllowAnonymousAccess] public string GetInfo() {     ... } Inside these operations you might have an authenticated or an anonymous principal on Thread.CurrentPrincipal, and it is up to your code to decide what to do. Side note: Being a security guy, I like this opt-in approach to anonymous access much better that all those opt-out approaches out there (like the Authorize attribute – or this.). Claims-based Authorization Since there is a ClaimsPrincipal available, you can use the standard WIF claims authorization manager infrastructure – either declaratively via ClaimsPrincipalPermission or programmatically (see also here). [ClaimsPrincipalPermission(SecurityAction.Demand,     Resource = "Claims",     Operation = "View")] public ViewClaims GetClientIdentity() {     return new ServiceLogic().GetClaims(); }   In addition you can also turn off per-request authorization (see here for background) via the config and just use the “domain specific” instrumentation. While the code is not 100% done – you can download the current solution here. HTH (Wanna learn more about federation, WIF, claims, tokens etc.? Click here.)

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• How to implement friction in a physics engine based on "Advanced Character Physics"

  - by paldepind

  I have implemented a physics engine based on the concepts in the classic text Advanced Character Physics by Thomas Jakobsen. Friction is only discussed very briefly in the article and Jakobsen himself notes how "other and better friction models than this could and should be implemented." Generally how could one implement a believable friction model on top of the concepts from the mentioned article? And how could the found friction be translated into rotation on a circle? I do not want this question to be about my specific implementation but about how to combine Jakobsens ideas with a great friction system more generally. But here is a live demo showing the current state of my engine which does not handle friction in any way: http://jsfiddle.net/Z7ECB/embedded/result/ Below is a picture showing and example on how collision detection could work in an engine based in the paper. In the Verlet integration the current and previous position is always stored. Based on these a new position is calculated. In every frame I calculate the distance between the circles and the lines. If this distance is less than a circles radius a collision has occurred and the circle is projected perpendicular out of the offending line according to the size of the overlap (offset on the picture). Velocity is implicit due to Verlet integration so changing position also changes the velocity. What I need to do know is to somehow determine the amount of friction on the circle and move it backwards parallel to the line in order to reduce its speed.

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• Will Ubuntu break my RAID 0 array?

  - by Chad

  I am upgrading an older machine today with new Motherboard, RAM, and CPU. Then I am going to do a fresh install of Ubuntu 64bit. Currently the old machine has an 80gb system drive, and a 4TB RAID 0 array. The old Motherboard has no SATA ports, so I used a SATA card. Ubuntu set up the old RAID array, will it still recognize the array on a newer machine? Are there any steps I should take to ensure the array isn't damaged? It's non-crucial data, but I would rather not start over if it can be avoided. Thanks.

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• multi-dimension array problem in RGSS (RPG Maker XP)

  - by AzDesign

  This is my first day code script in RMXP. I read tutorials, ruby references, etc and I found myself stuck on a weird problem, here is the scenario: I made a custom script to display layered images Create the class, create an instance variable to hold the array, create a simple method to add an element into it, done The draw method (skipped the rest of the code to this part): def draw image = [] index = 0 for i in [email protected] if image.size > 0 index = image.size end image[index] = Sprite.new image[index].bitmap = RPG::Cache.picture(@components[i][0] + '.png') image[index].x = @x + @components[i][1] image[index].y = @y + @components[i][2] image[index].z = @z + @components[i][3] @test =+ 1 end end Create an event that does these script > $layerz = Layerz.new $layerz.configuration[0] = ['root',0,0,1] > $layerz.configuration[1] = ['bark',0,10,2] > $layerz.configuration[2] = ['branch',0,30,3] > $layerz.configuration[3] = ['leaves',0,60,4] $layerz.draw Run, trigger the event and the result : ERROR! Undefined method`[]' for nil:NilClass pointing at this line on draw method : image[index].bitmap = RPG::Cache.picture(@components[i][0] + '.png') THEN, I changed the method like these just for testing: def draw image = [] index = 0 for i in [email protected] if image.size > 0 index = image.size end image[index] = Sprite.new image[index].bitmap = RPG::Cache.picture(@components[0][0] + '.png') image[index].x = @x + @components[0][1] image[index].y = @y + @components[0][2] image[index].z = @z + @components[0][3] @test =+ 1 end I changed the @components[i][0] to @components[0][0] and IT WORKS, but only the root as it not iterates to the next array index Im stuck here, see : > in single level array, @components[0] and @components[i] has no problem > in multi-dimension array, @components[0][0] has no problem BUT > in multi-dimension array, @components[i][0] produce the error as above > mentioned. any suggestion to fix the error ? Or did I wrote something wrong ?

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• Examples of permission-based authorization systems in .Net?

  - by Rachel

  I'm trying to figure out how to do roles/permissions in our application, and I am wondering if anyone knows of a good place to get a list of different permission-based authorization systems (preferably with code samples) and perhaps a list of pros/cons for each method. I've seen examples using simple dictionaries, custom attributes, claims-based authorization, and custom frameworks, but I can't find a simple explanation of when to use one over another and what the pros/cons are to using each method. (I'm sure there's other ways than the ones I've listed....) I have never done anything complex with permissions/authorization before, so all of this seems a little overwhelming to me and I'm having trouble figuring out what what is useful information that I can use and what isn't. What I DO know is that this is for a Windows environment using C#/WPF and WCF services. Some permission checks are done on the WCF service and some on the client. Some are business rules, some are authorization checks, and others are UI-related (such as what forms a user can see). They can be very generic like boolean or numeric values, or they can be more complex such as a range of values or a list of database items to be checked/unchecked. Permissions can be set on the group-level, user-level, branch-level, or a custom level, so I do not want to use role-based authorization. Users can be in multiple groups, and users with the appropriate authorization are in charge of creating/maintaining these groups. It is not uncommon for new groups to be created, so they can't be hard-coded.

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• Flattening a Jagged Array with LINQ

  - by PSteele

  Today I had to flatten a jagged array.  In my case, it was a string[][] and I needed to make sure every single string contained in that jagged array was set to something (non-null and non-empty).  LINQ made the flattening very easy.  In fact, I ended up making a generic version that I could use to flatten any type of jagged array (assuming it's a T[][]): private static IEnumerable<T> Flatten<T>(IEnumerable<T[]> data) { return from r in data from c in r select c; } Then, checking to make sure the data was valid, was easy: var flattened = Flatten(data); bool isValid = !flattened.Any(s => String.IsNullOrEmpty(s)); You could even use method grouping and reduce the validation to: bool isValid = !flattened.Any(String.IsNullOrEmpty); Technorati Tags: .NET,LINQ,Jagged Array

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• Find an element in a JavaScript array

  - by Aligned

  Originally posted on: http://geekswithblogs.net/Aligned/archive/2014/08/22/find-an-element-in-a-javascript-array.aspxI needed a C# Dictionary like data structure in JavaScript and then a way to find that object by a key. I had forgotten how to do this, so did some searching and talked to a colleague and came up with this JsFiddle. See the code in my jsFiddle or below: var processingProgressTimeoutIds = []; var file = { name: 'test', timeId: 1 }; var file2 = { name: 'test2', timeId: 2 }; var file3 = { name: 'test3', timeId: 3 }; processingProgressTimeoutIds.push({ name: file.name, timerId: file.id }); processingProgressTimeoutIds.push({ name: file2.name, timerId: file2.id }); processingProgressTimeoutIds.push({ name: file3.name, timerId: file3.id }); console.log(JSON.stringify(processingProgressTimeoutIds)); var keyName = 'test'; var match = processingProgressTimeoutIds.filter(function (item) { return item.name === keyName; })[0]; console.log(JSON.stringify(match)); // optimization var match2 = processingProgressTimeoutIds.some(function (element, index, array) { return element.name === keyName; }); console.log(JSON.stringify(match2)); // if you have the full object var match3 = processingProgressTimeoutIds.indexOf(file); console.log(JSON.stringify(match3)); // http://jsperf.com/array-find-equal – from Dave // indexOf is faster, but I need to find it by the key, so I can’t use it here //ES6 will rock though, array comprehension! – also from Dave // var ys = [x of xs if x == 3]; // var y = ys[0]; Here’s a good blog post on Array comprehension.

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• Vector with Constant-Time Remove - still a Vector?

  - by Darrel Hoffman

  One of the drawbacks of most common implementations of the Vector class (or ArrayList, etc. Basically any array-backed expandable list class) is that their remove() operation generally operates in linear time - if you remove an element, you must shift all elements after it one space back to keep the data contiguous. But what if you're using a Vector just to be a list-of-things, where the order of the things is irrelevant? In this case removal can be accomplished in a few simple steps: Swap element to be removed with the last element in the array Reduce size field by 1. (No need to re-allocate the array, as the deleted item is now beyond the size field and thus not "in" the list any more. The next add() will just overwrite it.) (optional) Delete last element to free up its memory. (Not needed in garbage-collected languages.) This is clearly now a constant-time operation, since only performs a single swap regardless of size. The downside is of course that it changes the order of the data, but if you don't care about the order, that's not a problem. Could this still be called a Vector? Or is it something different? It has some things in common with "Set" classes in that the order is irrelevant, but unlike a Set it can store duplicate values. (Also most Set classes I know of are backed by a tree or hash map rather than an array.) It also bears some similarity to Heap classes, although without the log(N) percolate steps since we don't care about the order.

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• Rotate canvas along its center based on user touch - Android

  - by Ganapathy

  I want to rotate the canvas circularly on its center axis based on user touch. i want to rotate based on center but its rotating based on top left corner . so i am able to see only 1/4 for rotation of image. any idea.. Like a old phone dialer . I have tried like as follows onDraw(Canvas canvas){ canvas.save(); // do my rotation canvas.rotate(rotation,0,0); canvas.drawBitmap( ((BitmapDrawable)d).getBitmap(),0,0,p ); canvas.restore(); } @Override public boolean onTouchEvent(MotionEvent e) { float x = e.getX(); float y = e.getY(); updateRotation(x,y); mPreviousX = x; mPreviousY = y; invalidate(); } private void updateRotation(float x, float y) { double r = Math.atan2(x - centerX, centerY - y); rotation = (int) Math.toDegrees(r); }

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• Generating grammatically correct MUD-style attack descriptions

  - by Extrakun

  I am currently working on a text based game, where the outcome of a combat round goes something like this %attacker% inflicts a serious wound (12 points damage) on %defender% Right now, I just swap %attacker% with the name of the attacker, and %defender% for the name of the defender. However, the description works, but don't read correctly. Since the game is just all text, I don't want to resort to generic descriptions (Such as "You use Attack on Goblin for 5 damage", which arguably solve the problem) How do I generate correct descriptions for cases where %attacker% refers to "You", the player? "You inflicts..." is wrong "Bees", or other plural? I need somehow to know I should prefix the name with a "The " If %attacker% is a generic noun, such as "Goblin", it will read weird as opposed to %attacker% being a name. Compare "Goblin inflicts..." vs. "Aldraic Swordbringer inflicts...." How does text-based games usually resolve such issues?

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• Creating Array of PictureBox controls in C#

  In this article, I try to create Array of PictureBox controls, you can create array of Labels and Buttons as my example.

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• Importing tab delimited file into array in Visual Basic 2013 [migrated]

  - by JaceG

  I am needing to import a tab delimited text file that has 11 columns and an unknown number of rows (always minimum 3 rows). I would like to import this text file as an array and be able to call data from it as needed, throughout my project. And then, to make things more difficult, I need to replace items in the array, and even add more rows to it as the project goes on (all at runtime). Hopefully someone can suggest code corrections or useful methods. I'm hoping to use something like the array style sMyStrings(3,2), which I believe would be the easiest way to control my data. Any help is gladly appreciated, and worthy of a slab of beer. Here's the coding I have so far: Imports System.IO Imports Microsoft.VisualBasic.FileIO Public Class Main Dim strReadLine As String Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim sReader As IO.StreamReader = Nothing Dim sRawString As String = Nothing Dim sMyStrings() As String = Nothing Dim intCount As Integer = -1 Dim intFullLoop As Integer = 0 If IO.File.Exists("C:\MyProject\Hardware.txt") Then ' Make sure the file exists sReader = New IO.StreamReader("C:\MyProject\Hardware.txt") Else MsgBox("File doesn't exist.", MsgBoxStyle.Critical, "Error") End End If Do While sReader.Peek >= 0 ' Make sure you can read beyond the current position sRawString = sReader.ReadLine() ' Read the current line sMyStrings = sRawString.Split(New Char() {Chr(9)}) ' Separate values and store in a string array For Each s As String In sMyStrings ' Loop through the string array intCount = intCount + 1 ' Increment If TextBox1.Text <> "" Then TextBox1.Text = TextBox1.Text & vbCrLf ' Add line feed TextBox1.Text = TextBox1.Text & s ' Add line to debug textbox If intFullLoop > 14 And intCount > -1 And CBool((intCount - 0) / 11 Mod 0) Then cmbSelectHinge.Items.Add(sMyStrings(intCount)) End If Next intCount = -1 intFullLoop = intFullLoop + 1 Loop End Sub

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