![]() No need to wait for sequential processing of each Message. FoxPro’s single-threaded architecture can be circumvented with this approach. whatever machine is running the Message Processor app), you can actually launch MULTIPLE instances of the Message Processor, and that lets it run essentially achieve the performance of a multi-threaded app because you are processing several Messages simultaneously. You can launch multiple instance of the Queue Processor to handle Messages in one or more Queues if you have heavy workload or wanted to focus horsepower on a certain Message type.Īnother thing this allows is that on the “server” (i.e.You can re-process any requests that failed, in case there were errors other reasons that the task could not be completed at that time.You can direct certain types of Message to different “Queues” so that you can halt processing of certain Queues if you wanted to.You wind up with a complete log of who submitted what, and when, how long it took, and if there were any errors processing the various messages.Other great benefits of this pattern and architecture: Message Queue Monitor – UI FormĪ simple UI form allows you to observer all the Message processing as it happens. Along the way you can send other other messages, emails, SMS text messages, reject messages, etc. task) is picked up by the Processor it is marked as Started, and when all the processing is finished the record is marked as Complete. Step 2 – Process the “Message”: Down the hall, you are running a Message Queue Processor on a server or other workstation that can access the database, network drives, printers, internet, make API calls, etc needed to complete the task. Boom… in a blink the local user workflow is finished and they think your system is the fastest thing in the world, because now their computer is free in a few milliseconds and they can resume other tasks. Step 1 – Submit a “Message”: Create and submit a simple Message record to the QueueMessageItems database table which has the name of the Process or Action that you want to execute, along with any required parameters, values, settings, user selections, other other criteria required to complete the task. Using some helpful classes from the West Wind Web Connection framework (also available in the West Wind Client Tools package) we can implement a robust Message Queue solution in Visual FoxPro. server or other workstation) to be processed offline, “in the background”, aka “asynchronously”, either immediately or at some later time. Job Queues, Message Queues, Message Broker, Asynchronous Processing… There are many names for this very helpful architecture where you take a process that holds up a user’s workstation for several seconds, or even minutes, and move the work to another machine (i.e. VersionDate = Date(2013, 9, 23) & this avoids date formatting issuesĮxport your Visual FoxPro reports to Images, RTF, PDF, HTML or XLS super easy! Send them by email! Enhance the look of your previews, and allow your users to decide how their report previews will be. VersionNumber = 'v2.99z30' & this must be character! VersionLocalFilename = 'FoxyPreviewerVersionFile.txt' LcRegisterWithThor = Strtran(lcRegisterWithThor, loUpdateObject Messagebox('From the Thor menu, see "More -> Open Folder -> Components"', 0 ,"FoxBarCode installed", 5000) ![]() Text to lcRegisterWithThor NoShow TextMerge Here is the code in thor_Update_FoxyPreviewer.prg With these two things in place, lots a black magic happens (or, white magic, since it is Jim, and he is a good fella by most accounts), and users will see that a new update is available, and if Jim has been living right, it will download and unzip to the users local Tools or Components path in the Thor folder. He, or the tool author, must also post the referenced ZIP file to the server (usually an ftp server at a web hosting account) at the URL path referenced in the updater prg. Users will see all available updates for any of the Thor distributed apps in the CFU grid. SourceFileUrl property which has the URL location of a zip file on the server which all the app file in it. VersionFileURL property which points to a file on the server which has the new version number), and a. VersionNumber (or the updater pfg may use a. So, he sends out an updated Thor_Update_>.prg with the new. Distribute an updated updater prg which will be pulled down when the user from Thor Check For Update. ![]() So, to get a tool updated, Jim has to do 2 things: ![]()
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