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SQLite in a multithreaded java application

由 。_饼干妹妹 提交于 2019-11-26 22:48:23
问题 I have written a java application that sporadically logs events to an SQLite database from multiple threads. I've noticed that I can trigger SQLite's "Database Locked" errors relatively easily by spawning a small number of events at the same time. This drove me to write a test program that mimics the worst case behavior and I was surprised by how poorly it seems that SQLite performs in this use case. The code posted below simply adds five records to a database, first sequentially to get

BitmapImage in WPF does lock file

由 蹲街弑〆低调 提交于 2019-11-26 21:02:40
I use: Dim bmi As New BitmapImage(New Uri(fiInfo.FullName, UriKind.Absolute)) bmi.CacheOption = BitmapCacheOption.OnLoad this does not Use OnLoad And file still is locked to overwrite on harddisk. Any idea how to unlock? Regards As shown in the question you link to, you'd need to call BeginInit and EndInit, like so as well as set the UriSource property: Dim bmi As New BitmapImage() bmi.BeginInit() bmi.CacheOption = BitmapCacheOption.OnLoad bmi.UriSource = New Uri(fiInfo.FullName, UriKind.Absolute) bmi.EndInit() Read the BitmapImage from file and rewrite it with a MemoryStream : MemoryStream ms

How to handle background audio playing while iOS device is locked or on another application?

由 你。 提交于 2019-11-26 14:30:44
Designing a generative music system for iOS, using OpenFrameworks, I'd need to provide a mode in which the user could listen the music produced by the application when: the device is locked the user uses another application Some applications like BLOOM, or alarm clock, works like that and propose to users a switch to enable/disable this feature. Any tips for that ? Playing Background Audio An app that plays or records audio continuously (even while the app is running in the background) can register to perform those tasks in the background. You enable audio support from the Background modes

BitmapImage in WPF does lock file

由 女生的网名这么多〃 提交于 2019-11-26 07:50:03
问题 I use: Dim bmi As New BitmapImage(New Uri(fiInfo.FullName, UriKind.Absolute)) bmi.CacheOption = BitmapCacheOption.OnLoad this does not Use OnLoad And file still is locked to overwrite on harddisk. Any idea how to unlock? Regards 回答1: As shown in the question you link to, you'd need to call BeginInit and EndInit, like so as well as set the UriSource property: Dim bmi As New BitmapImage() bmi.BeginInit() bmi.CacheOption = BitmapCacheOption.OnLoad bmi.UriSource = New Uri(fiInfo.FullName, UriKind

OperationalError: database is locked

由 纵饮孤独 提交于 2019-11-26 06:41:08
问题 I have made some repetitive operations in my application (testing it), and suddenly I’m getting a weird error: OperationalError: database is locked I\'ve restarted the server, but the error persists. What can it be all about? 回答1: From django doc: SQLite is meant to be a lightweight database, and thus can't support a high level of concurrency. OperationalError: database is locked errors indicate that your application is experiencing more concurrency than sqlite can handle in default

How to handle background audio playing while iOS device is locked or on another application?

由 杀马特。学长 韩版系。学妹 提交于 2019-11-26 03:55:08
问题 Designing a generative music system for iOS, using OpenFrameworks, I\'d need to provide a mode in which the user could listen the music produced by the application when: the device is locked the user uses another application Some applications like BLOOM, or alarm clock, works like that and propose to users a switch to enable/disable this feature. Any tips for that ? 回答1: Playing Background Audio An app that plays or records audio continuously (even while the app is running in the background)
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