In a scenario where we're doing something that takes time and we don't save the result, we don't want the job to keep going if the user leaves. We can use _nolink/3 to make sure that our LiveView won't die even if the task crashes and that the error will be reported.Ģ) We need to think about what kind of work we want to do asynchronously. If we don't have control over the result of the task, and we don't want our LiveView to crash if the task crashes, we must use a different alternative to launch our task. Which means that both processes have a relationship: if one crashes, the other does too. José shows us this pattern in his recent video!ġ) When a task is spawned using Task.async/2, it is linked to the caller. No resources are spent on a process from which nobody expects the result anymore. We don't even have to worry if the user closes the browser tab! The process dies just like the LiveView, and the work is automatically cancelled. We use this reference to stop monitoring the task -and not receive a message if it dies-, since we received the result we needed from our task and we can discard an exit message.įinally we set the result in the assign :label to display it, and we hide our spinner by changing the content of the assign :running.Īn elegant solution, right? Just a couple lines of simple Elixir concurrency to delegate the work and limit the responsibilities of our LiveView. And Task.await/2 waits for the task's message and returns the result:ĭef handle_info ( tuple, where ref is the monitor's reference. This is possible with a couple of functions: Task.async/1 launches a process that, when it finishes its work, sends a message with the result to the caller. Sometimes we need to perform some processing asynchronously, and we need to wait for the result. The main actor is the Task module, we can use it to spawn processes to complete a specific task. How can we run async processing in a LiveView? How can we return results of an async process to the LiveView? Solution That little trick of asynchronously working in the background while being handled all from the server was just so elegantly simple and clean that it deserves a deeper look! Problem Once the processing is done, the indicator disappears and the results are printed on the screen: This means the user is not blocked and can still interact with the page while the process chugs away performing the work. The example works like this: You upload an image and the process for classifying images with Bumblebee runs in an asynchronous process while a small working indicator is shown. We can see all the parts together in one place, and run the example just with a single command… it must be said, it's impressive! Last month Chris McCord developed an amazing single-file example for doing image classification using Bumblebee, Nx and LiveView. Fly.io is a great place to run your Elixir applications! Check out how to get started! In this post we talk about how to perform async processing from a LiveView using easy Elixir concurrency. 4 min Share this post on Twitter Share this post on Hacker News Share this post on Reddit Async Processing in LiveView Author Name Berenice Medel Social Media View Twitter Profile Image by Annie Ruygt.When you use the Liveview Grading application, camera functions related to still image shooting cannot be set.You cannot adjust parameters while shooting. After the Preset selection, If you press ADJUST on the shooting standby screen, the screen will be switched to the Parameter adjustment screen.However, that the available setting items vary depending on the camera model. You can change the shooting settings of the camera using MENU or other applicable camera buttons before shooting the image ( Movie Exposure Mode ( P/A/S/M in Movie mode), Focus mode, Exposure Comp.,White Balance, ISO, File format (AVCHD, etc.).You can reset parameter values only for the current preset settings or for all preset settings. Parameter Reset - Returns the values set using Parameter Adj.Adjusts such items as contrast and sharpness for the selected preset settings to make finer adjustments to your preferred color tone. Preset Selection - When this item is selected, the screen will be switched to the preset selection page.Select the preferred preset from the preset groups. Group Selection - The preset settings are classified into groups.Select Liveview Grading and select the desired item.Visit the website for information about supported cameras.įollow these steps on how to use Liveview Grading: IMPORTANT: Liveview Grading is only supported on select Sony® camera models. Liveview Grading has presets that can be seen real-time without using a professional instrument or software. Liveview Grading is a PlayMemories™ Camera App that will allow you to add effects on the movies you will record.
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