Any replacement of Observer/listener for linux?

carlhung · November 19, 2020, 2:50am

i am looking for observer/listener replacement for linux. thanks.

eskimo · November 19, 2020, 8:32am

I encourage you to clarify your request:

You say “replacement” but aren’t clear about what you’re replacing or why you’re replacing it.
Are you looking to just import a Swift package? Or for guidelines on how you’d implement this yourself?
“observer/listener” is a very general concept. Can you be more specific about your requirements?

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Quinn “The Eskimo!” @ DTS @ Apple

carlhung · November 19, 2020, 3:28pm

Look for a swift package

eskimo · November 20, 2020, 9:13am

Look for a swift package

OK, that answers my second question. What about 1 and 2?

ps While I appreciate the succinctness of your single-line posts, this process will go a bit quicker if you’re a little more expansive.

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Quinn “The Eskimo!” @ DTS @ Apple

Diggory · November 20, 2020, 10:32am

If I am reading the wikipedia page correctly, isn't NotificationCenter an example of the pattern?

jonprescott · November 20, 2020, 2:26pm

I think NotificationCenter (bridged to Objective-C NSNotificationCenter) is implemented only in Darwin systems as part of AppKit/UIKit. Don't think that it is implemented in Linux, et al.

Diggory · November 20, 2020, 3:01pm

It's in Foundation.

github.com

apple/swift-corelibs-foundation/blob/76068b8caf54f250a7be5336a7c6bb97f55469f8/Sources/Foundation/NSNotification.swift

// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//

open class NSNotification: NSObject, NSCopying, NSCoding {
    public struct Name : RawRepresentable, Equatable, Hashable {
        public private(set) var rawValue: String

        public init(_ rawValue: String) {
            self.rawValue = rawValue
        }

        public init(rawValue: String) {
            self.rawValue = rawValue
        }

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jonprescott · November 20, 2020, 9:58pm

Did not know that! I don't keep up with open-source implementations of the Darwin frameworks. Just program on Macs.

carlhung · November 21, 2020, 6:15am

I also thought like that. haha.

carlhung · November 21, 2020, 6:15am

will try. thanks.