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We have users with over 100,000 photos in Dropbox, and we needed to build a metadata-loading pipeline that could accommodate them. Sharing, too, is delightful, and I love the idea of Instagram Direct-like conversations between you and your Carousel-using friends. Of course, we still have to coordinate on accesses to disk between these two threads to give the app a consistent view of the data. There are also more parts of the UI layer that we've optimized between the snapshot model and the end result users see. Also the upload in the Dropbox app stops prematurely compared to carousel that would upload quicker and didn't pause like … The snapshots allow looking up photos by absolute position in the ordering of all photos and by (event_index, index_within_event) pairs (iOS developers will recognize this pair as  NSIndexPath in disguise). In the last post, Stephen explored the asynchronous client-server communication model we use in Carousel to provide a fast user experience, where interactions aren’t blocked on network calls. What do we want from a photos app? Published on April 09, 2014 Once upon a time, photos were something you held. With Carousel’s auto-upload feature, deleting those four images just became a sight more difficult. We prepare an in-memory “view model”, a data structure that provides exactly this: an index on our metadata that is fast enough to query on the UI thread at render time. Having a large data model in C++ rather than in Java also helps us avoid stuttering app behavior on Android due to large garbage collections. There are certainly flashes of nostalgia in my timeline—thanks to one set of images, I spent half an hour telling my boyfriend about a trip I took to his hometown years before we even knew each other—but they’re often adrift in a sea of random icons and rejected drawings. This scheme gets a bit more complicated because our snapshots also cache information to make various lookups faster, but having the ability to make fast, shallow copies remains the core idea. That, to me, is Carousel’s big weakness right out of the gate: You can’t tell it what not to sync. [8], Carousel prompted users to free local storage once it had synced and backed-up local photos to the cloud. And deleting stuff manually just seems so dangerous. In the simplest implementation, when we'd like to change an item, we would have to make a copy of the entire immutable data structure with that single item changed. [5] Photos were organized by date, time and event[6] and backed up on Dropbox. It makes easy to browse and share photos on your phone or stored on Dropbox. Carousel の主な機能は、Dropbox アプリの写真機能でご利用になれます。また、Mailbox で学んだことは、コミュニケーションと共同作業の新しい方法として Dropbox の機能に活用されます(Paper 機能がその 1 つの例です)。 Browse everything in single gallery that’s automatically organized into events.● Keep all your photos with you without running out of space. To give the UI code control over when the data can change during its calculations, we present the UI with an immutable snapshot of the data model every time we call commit. Drew and Arash, Published on To remove this latency, we improved the performance of these immutable snapshots dramatically by changing up the structure so we could take fast, shallow copies. There are quite a few drawbacks here, especially if you have to deal with more than 2MB of data. The bonus space will appear instantly in your Dropbox. Early this year, Dropbox threw a glitzy launch event for its new photo storage and viewing app Carousel, and people went right on using the dozen … Simply reading the metadata off of disk is too slow to do on demand while scrolling, so we keep a model of the user’s photo metadata in memory that reflects the metadata we have in our cache on disk. [1] Much of the features in Carousel come from Snapjoy, a photo start-up, that Dropbox acquired on December 19, 2012. Both of these requirements drove us toward an interface that would allow for incremental updates, which is why we call our in-memory data model an “accumulator”. When we get a new snapshot, on iOS we call  [UITableView reloadData:] to swap the new view model for the old. Second, it’s easy to miss the fact that the query is run the first time the Cursor needs data (generally during the first call to moveToFirst or getCount), which might be on the main thread. Copyright 2020 AppAdvice LLC. In Carousel, we wanted to fix the experience for users with more than a single page of photos by using a different model for loading photo metadata off of disk. To view your photos online, go to photos.dropbox.com. Ilya Fushman, By Carousel's Flashback feature helps you rediscover photos you’ve forgotten about by showing you weekly highlights of some of your best photos from past years. SQLite is a single-threaded library, so to read the results of a SQLite query in C, one needs to execute a query and step through the result rows all while holding a lock on the database connection. Second, we also need to be able to load the initial view of Carousel without blocking on a full read of the metadata on disk. With this interface in place, we’ve been able to develop and optimize our database transactions without adding much complexity to the higher application layer. Once photos are safely backed up to Dropbox, Carousel can remove them from your local storage, making sure you don’t run out of space on your phone or tablet.Reasons you’ll love Carousel:● Have photos and videos spread across your phone and Dropbox? Because the way we access this data structure is similar between iOS and Android, we can actually share this view model between the two platforms, implementing the logic only once in C++. Even if you work around this while preparing the query by forcing the query to run on a background thread, a second run of the query will be whenever you advance past the first 2MB, which is also likely to be on the main thread. Dropbox Carousel was a photo and video[1] management app offered by Dropbox. Macworld |. [4] Flashback was a feature (enabled by default) that showed past photos or videos taken the same day, a year, or some years back. You kept them safe in an album or shoebox, and it was easy to relive those moments with friends and family. A confirmation email has been sent to On Android, this is typically done with Loaders and Cursors. Incremental updates have an advantage in that they allow for animating changes to the data model (i.e. This meant building a metadata-loading system that can show photos on-screen within a second of opening the app and provides smooth … The Dropbox photo experience will not have a dedicated view for your hidden photos and videos. Who among us hasn’t taken five pictures in quick succession, planning on deleting four of them? There are generally two major ways UI frameworks will support updating the data backing the UI: Android primarily uses the first pattern, while iOS generally uses the second. We're still working on the Free up space feature, and hope to have updates later this year. Rob Baesman, By We make use of this interface by adding photos in a few places: These three code paths happen on separate threads, so we need to avoid having two threads with open EventsAccumulator transactions at the same time. Thank you! [4] Flashback used an algorithm designed to identify human faces - resulting in greater likelihood of the user's picture or people in the user's close circle appearing. To unhide these photos: We’re sorry to hear that. ", "Dropbox Carousel comes to iPad and web today, Android tablets soon", "Dropbox's Carousel app now frees up phone storage for you", "iPhone 6s Live Photos turn dead-flat on Dropbox, Flickr and Google Photos", "Google Photos hits 100 million monthly users after five months", "Dropbox acquires Snapjoy, a photo aggregation and sharing service", "Dropbox is shutting down its Mailbox and Carousel apps", https://en.wikipedia.org/w/index.php?title=Dropbox_Carousel&oldid=926309195, All Wikipedia articles written in American English, Pages using Infobox software with unknown parameters, Creative Commons Attribution-ShareAlike License, This page was last edited on 15 November 2019, at 14:19.

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