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  • quartz: preventing concurrent instances of a job in jobs.xml

    - by Jason S
    This should be really easy. I'm using Quartz running under Apache Tomcat 6.0.18, and I have a jobs.xml file which sets up my scheduled job that runs every minute. What I would like to do, is if the job is still running when the next trigger time rolls around, I don't want to start a new job, so I can let the old instance complete. Is there a way to specify this in jobs.xml (prevent concurrent instances)? If not, is there a way I can share access to an in-memory singleton within my application's Job implementation (is this through the JobExecutionContext?) so I can handle the concurrency myself? (and detect if a previous instance is running) update: After floundering around in the docs, here's a couple of approaches I am considering, but either don't know how to get them to work, or there are problems. Use StatefulJob. This prevents concurrent access... but I'm not sure what other side-effects would occur if I use it, also I want to avoid the following situation: Suppose trigger times would be every minute, i.e. trigger#0 = at time 0, trigger #1 = 60000msec, #2 = 120000, #3 = 180000, etc. and the trigger#0 at time 0 fires my job which takes 130000msec. With a plain Job, this would execute triggers #1 and #2 while job trigger #0 is still running. With a StatefulJob, this would execute triggers #1 and #2 in order, immediately after #0 finishes at 130000. I don't want that, I want #1 and #2 not to run and the next trigger that runs a job should take place at #3 (180000msec). So I still have to do something else with StatefulJob to get it to work the way I want, so I don't see much of an advantage to using it. Use a TriggerListener to return true from vetoJobExecution(). Although implementing the interface seems straightforward, I have to figure out how to setup one instance of a TriggerListener declaratively. Can't find the docs for the xml file. Use a static shared thread-safe object (e.g. a semaphore or whatever) owned by my class that implements Job. I don't like the idea of using singletons via the static keyword under Tomcat/Quartz, not sure if there are side effects. Also I really don't want them to be true singletons, just something that is associated with a particular job definition. Implement my own Trigger which extends SimpleTrigger and contains shared state that could run its own TriggerListener. Again, I don't know how to setup the XML file to use this trigger rather than the standard <trigger><simple>...</simple></trigger>.

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  • Read from XML > Add to Listview

    - by Zubirg
    I have some problems getting the data that i read from XML split into seperate columns. Any help this new C# coder would get would be appreciated. XDocument xmlDoc = XDocument.Load("emails.xml"); var t = from c in xmlDoc.Descendants("dt") select (string)c.Element("name") + (string)c.Element("email"); foreach (string item in t) { listView.Items.Add(item); }

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  • simple text menu in Haskell

    - by snorlaks
    Hello, I would like to know what is the best solution to create simple menu with functionality described below (pseudo code) just like im used to: while (true){ x = readLine(); case (x): x == "1" then do sth1 function x == "2" then do sth2 function } thanks for help, maybe any other ideas on how to make menu not in pattern described above?

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  • Simple ASP.NET Database Query

    - by Steven
    I have loaded my database with one table under "Data Connections" in the "Server Explorer" pane. What is the standard / best-practices way to handle a simple query in a VB ASPX page? My left <div> would be a set of form elements to filter rows, and when the button is clicked, the main <div> would show the columns I want for the rows returned. Note: Answers in C# are okay too, I'll just translate.

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  • Need a simple tool for analysing unicode characters

    - by Steve Bennett
    I'm surprised I can't find a simple tool for this. Basically, sometimes as a result of text munging, or using some piece of software, I end up with some text that has some troublesome characters - such as looking a lot like other characters, but being distinct from them. I'd like a tool (preferably online, javascript based) where I can paste the text, and it will tell me all the characters involved, their names, unicode codes etc.

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  • REGEX rejecting simple alphamumeric

    - by GDB
    I don't get it; this should be simple: Why does this text box entry: Foo 2010 Validated by this REGEX: ValidationExpression="^[a-zA-Z0-9 -_!]+$" Throw an invalid entry error? It is intended to allow alphamumerics, spaces, dashes, underscores and exclamation marks. REGEX gives me a headache ...

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  • Hitting a XML API using phonegap?

    - by smnirven
    Hey folks, I am looking at using phonegap to create a mobile app that accesses a xml api, I noticed there is a HTTP class defined in phonegap http://phonegap.pbworks.com/JavaScript-API#http, but I can't seem to find anyone that has used it yet. Any examples out there or hints/tips on using the http class to access a xml api?

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  • Help with simple SQL Server query

    - by Bram
    I have to tables as follows; Employees: Name nvarchar(50), Job Title nvarchar(50) and Salary int. Employers: Name nvarchar(50), Job Title nvarchar(50) I would like to select every item from the 'Employers' table where 'Job Title' does NOT show up in the 'Employees' table. I know this is a simple query but it has me stumped. I'd be grateful for any help. Thanks.

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  • ASP.NET custom routes for simple requirements management tool

    - by Andrew
    I am implementing a very simple requirements management tool. I want the URLs to look like this: Shows home page for "Project One": http://projectmanager/Project/Project%20One Shows a list of requirements being worked on for "Project One" http://projectmanager/Project/Project%20One/Requirements Shows requirement 1 for "Project One" http://projectmanager/Project/Project%20One/Requirement/1 How could I set up routes so that http://projectmanager/Project/Project%20One is handled by the project controller http://projectmanager/Project/Project%20One/Requirements and http://projectmanager/Project/Project%20One/Requirements/1 is handled by the requirements controller. Is it even possible?

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  • Easiest (simple) explanation of "prototype" in JavaScript?

    - by alexeypro
    Hello, Can somebody give me a resource (or just explanation? :-) of what "prototype" is and how it works in Javascript. May be comparison with something in Java? (not really necessary). But it should be as simple/easy as possible so inexperienced person just learning Javascript would understand (need to explain this to jr designer who is proficient with CSS/HTML, but not with Javascript). Thank you!

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  • PHP Libraries for Amazon Simple Notification Service

    - by webdestroya
    I wanted to start using the Amazon Simple Notification Service (http://aws.amazon.com/sns/), but I have not found any PHP libraries that I can use to access the service. I would rather not create my own library, I wanted to see if anybody has used any PHP libraries for the SNS service, and if they would recommend any.

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  • Require-Bundle and Import-Package versus feature.xml requires

    - by Robert Munteanu
    When building an Eclipse plugin (lato sensu) which consists of multiple plugins and one feature, I have two ways of specifying dependencies: in the plugins themselves, using Require-Bundle and Import-Package in META-INF/MANIFEST.MF; in the feature.xml file from the feature. In my understanding, it should be enough to declare the dependencies at the lower level, i.e. in the plugins. Why do we still have the feature.xml requires mechanism?

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  • replace XmlSlurper tag with arbitrary XML

    - by Misha Koshelev
    Dear All: I am trying to replace specific XmlSlurper tags with arbitrary XML strings. The best way I have managed to come up with to do this is: #!/usr/bin/env groovy import groovy.xml.StreamingMarkupBuilder def page=new XmlSlurper(new org.cyberneko.html.parsers.SAXParser()).parseText(""" <html> <head></head> <body> <one attr1='val1'>asdf</one> <two /> <replacemewithxml /> </body> </html> """.trim()) import groovy.xml.XmlUtil def closure closure={ bind,node-> if (node.name()=="REPLACEMEWITHXML") { bind.mkp.yieldUnescaped "<replacementxml>sometext</replacementxml>" } else { bind."${node.name()}"(node.attributes()) { mkp.yield node.text() node.children().each { child-> closure(bind,child) } } } } println XmlUtil.serialize( new StreamingMarkupBuilder().bind { bind-> closure(bind,page) } ) However, the only problem is the text() element seems to capture all child text nodes, and thus I get: <?xml version="1.0" encoding="UTF-8"?> <HTML>asdf<HEAD/> <BODY>asdf<ONE attr1="val1">asdf</ONE> <TWO/> <replacementxml>sometext</replacementxml> </BODY> </HTML> Any ideas/help much appreciated. Thank you! Misha p.s. Also, out of curiosity, if I change the above to the "Groovier" notation as follows, the groovy compiler thinks I am trying to access the ${node.name()} member of my test class. Is there a way to specify this is not the case while still not passing the actual builder object? Thank you! :) def closure closure={ node-> if (node.name()=="REPLACEMEWITHXML") { mkp.yieldUnescaped "<replacementxml>sometext</replacementxml>" } else { "${node.name()}"(node.attributes()) { mkp.yield node.text() node.children().each { child-> closure(child) } } } } println XmlUtil.serialize( new StreamingMarkupBuilder().bind { closure(page) } )

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  • how to implement k-means for simple grouping in java

    - by thandar
    Hi all, I would like to know simple k-means algorithm in java. I want to use k-means only for grouping one dimensional array not multi. For example, before grouping the array consists of 2,4,7,5,12,34,18,25 if we want four group then we got group 1: 2,4,5 group 2: 7,12 group 3: 18,25 group 4: 34

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  • Creating simple waveforms with CoreAudio

    - by Koning Baard
    I am new to CoreAudio, and I would like to output a simple sine wave and square wave with a given frequency and amplitude through the speakers using CA. I don't want to use sound files as I want to synthesize the sound. What do I need to do this? And can you give me an example or tutorial? Thanks.

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  • Java - simple division in Java ---> bug/feature?!

    - by msr
    Hello, Im astonished. Im trying this simple calculation in a Java application: System.out.println("b=" + (1 - 7/10)); Obviously Im wainting for "b=0.3" in the output but here's what I get: b=1 What?! Why this happens? If I make: System.out.println("b=" + (1-0.7)); I get the right result which is "b=0.3". What's going wrong here? Thanks!

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  • iPad App: Simple Launch View -> SplitViewController

    - by Aurimas
    Hello, I want to create an iPad app that would have a simple view at launch with buttons to different components of the app. Each button then could open up a splitviewcontroller type views. (Interface similar to WebMD: http://itunes.apple.com/us/app/webmd-for-ipad/id373185673?mt=8) I was reading online that Apple does not allow splitviewcontroller inside other controllers (like NavigationController). How do I solve this? Thanks!

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  • antlr: is there a simple example ?

    - by Eli
    I'd like to get started with antlr, but after spending a few hours reviewing the examples at the antlr.org site, I still cant get a clear understanding of the grammar to java process. is there some simple example? something like a four operations calculator implemented with antlr going through the parser definition and all the way to the java source code?

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  • Fast ruby http library for large XML downloads

    - by Vlad Zloteanu
    I am consuming various XML-over-HTTP web services returning large XML files ( 2MB). What would be the fastest ruby http library to reduce the 'downloading' time? Required features: both GET and POST requests gzip/deflate downloads (Accept-Encoding: deflate, gzip) - very important I am thinking between: open-uri Net::HTTP curb but you can also come with other suggestions. P.S. To parse the response, I am using a pull parser from Nokogiri, so I don't need an integrated solution like rest-client or hpricot.

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  • PHP date causing XML error

    - by Alejandra
    Hi guys! Using PHP Version 5.2.13, I'm trying to use the date() function to get/format date, such function is causing me to get all page in blank and firebug is showing the following error (XML tab): XML Parsing Error: no element found Location: moz-nullprincipal:{e80b3b2e-b8f1-4a2d-b906-03d42ca6a190} Line Number 1, Column 1: ^ thanks in advantage for your help Alejandra :)

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