polling

I have a database table which contains a queue of jobs. A separate program processes these jobs. I want to provide a webpage for users to watch the progress of the queue. The Server side scripting to query the table and return it in a JSON format is no problem. I've done some reading on jQuery and the PeriodicalUpdater plugin . I'm wondering if it is at all possible to use this plugin to create a visual queue (a basic explanation would be a one column table, with a row per entry in the queue), where jobs which have been completed are removed the next time it polls. As I say, the server side

Scan a set of directories continuously for a set of file name filters. For each file name filter arrived, process the file and repeat the steps for all What can be the recommended design for this in jdk 1.5 , possibly using java.concurrent.Executor and Future I have done a similar task with the web crawler.Just a few changes had to be made... It is a concurrent implementation with newly found directories getting scanned by the thread pool in the Executor Framework.It uses concurrent collections for Queue and List to hold the indexed files. The indexer picks up the files from the queue and does

My receive port is of sqlBinding and typed polling. It invokes a SP to fetch a record and based on filter condition the corresponding orchestration kicks off. The BizTalk group consists of 2 servers; thus 2 ReceiveHostInstances. If both the host instances are running -at some point the same request is being read twice - causing a duplicate at the receivers end. But, why is the reeive port reading it the same record more than once? The proc which reads the updates the record and updates it so that it wont be fecthed again. I observed this scenario while submitting 10 requests; receive port read

On startup, my program calls getifaddrs() to find out what network interfaces are available for link-local IPv6 multicasting. This works as far as it goes, but it doesn't handle the case where the set of available network interfaces changes after getifaddrs() has returned. Is there some way for the OS to notify my program when the network interfaces have changed, so I can call getifaddrs() again and update my list? Or am I doomed to poll getifaddrs() every few seconds, forever? (Note: on Windows, I call GetAdaptersAddresses() instead of getifaddrs(), but the same issue exists there) You

We can use polling to find out about updates from some source, for example, clients connected to a webserver. WCF provides a nifty feature in the way of Duplex contracts, in which, I can maintain a connection to a client, and make invocations on that connection at will. Some peeps in the office were discussing the merits of both solutions, and I wanted to get feedback on when each strategy is best used. I would use an event-based mechanism instead of polling. In WCF, you can do this easily by following the Publish-Subscribe framework that Juval Lowy provides at his website, IDesign.net .

The git plugin for hudson works well. However, the build script must update a version number in the files in the repository, commit, and push back to the repository. When Hudson polls next to check for changes, it goes into an infinite loop because it sees that commit as a "change" builds again, which commits a change, so it builds again, then it commits another change, etc... You get the idea. I stopped it, ran a "git log" in each repository and compared the latest commit ids are exactly the same using git ls-tree HEAD Also, Hudson runs this command to check for changes: git fetch +refs/heads

I managed getting a constant polling of the backend functional using this answer. But on every timeout the UI is flickering (empty model for a short time). How can I update the model (and the view respectively) after the new data arrived in order to avoid this flickering effect? Here is my current controller (slightly modified from step_11 (Angular.js Tutorial) ): function MyPollingCtrl($scope, $routeParams, $timeout, Model) { (function tick() { $scope.line = Model.get({ modelId : $routeParams.modelId }, function(model) { $timeout(tick, 2000); }); })(); } // edit: I'm using the current stable

I'm trying to program long polling functionality in Laravel, but when I use the sleep() function, the whole application freezes/blocks until the sleep() function is done. Does anyone know how to solve this problem? My javascript looks like this: function startRefresh() { longpending = $.ajax({ type: 'POST', url: '/getNewWords', data: { wordid: ""+$('.lastWordId').attr('class').split(' ')[1]+"" }, async: true, cache: false }).done(function(data) { $("#words").prepend(data); startRefresh(); }); } And the PHP: public function longPolling() { $time = time(); $wordid = Input::get('wordid'); session