jeme edited a comment on issue #417: URL: https://github.com/apache/lucenenet/issues/417#issuecomment-779662497
David Fowlers statement makes it sound like the implementation would call the delegate multiple times, I don't feel like that is quite an accurate way of describing the behavior. In the actual behavior, it makes a bit more sense why this happens. The basics is that the factory is called outside of a lock, which means if you call GetOrAdd simultaneously on two threads, each or their value factories will be executed. This may be a good read: https://andrewlock.net/making-getoradd-on-concurrentdictionary-thread-safe-using-lazy/ ---- Here are the usages I could find. Lucene.Net: https://github.com/apache/lucenenet/blob/master/src/Lucene.Net/Support/IO/FileSupport.cs#L363 https://github.com/apache/lucenenet/blob/master/src/Lucene.Net/Support/Configuration/EnvironmentVariablesConfigurationProvider.cs#L67 https://github.com/apache/lucenenet/blob/master/src/Lucene.Net/Search/SearcherLifetimeManager.cs#L174 Lucene.Net.TestFramework https://github.com/apache/lucenenet/blob/f5cca0b1a7c855f2fe44a5cdd27763aab7acdf22/src/Lucene.Net.TestFramework/Support/Configuration/TestConfigurationFactory.cs#L56 Lucene.Net.Spatial https://github.com/apache/lucenenet/blob/d5c5ca4b066ae7ba4839519ec162594844fbc10a/src/Lucene.Net.Spatial/Prefix/PrefixTreeStrategy.cs#L225 ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
