Inversion of Control and Dependency Injection

Inversion of Control and Dependency Injection, StructureMap Andriy Buday

Music Player – The design ,[object Object],[object Object],[object Object],[object Object],public class MusicPlayer { private SongFinder songFinder; public MusicPlayer() { songFinder = new SongFinder(); } public Song[] GetBandSongs(String band) { var allsongs = songFinder.FindAllSongs(); return allsongs .Where(x => x.Band == band).ToArray(); } } public class SongFinder { public virtual Song[] FindAllSongs() { var musStorage = new MusicStorage(); return musStorage.SONGS; } } Copyright © 2009 SoftServe, Inc.

Music Player – Introducing Interface ,[object Object],[object Object],[object Object],The constructor still has a static dependency on SongFinder public interface ISongFinder { Song[] FindAllSongs(); } private ISongFinder songFinder; public MusicPlayer() { songFinder = new SongFinder(); } public Song[] GetBandSongs(String band) { var allsongs = songFinder.FindAllSongs(); return allsongs .Where(x => x.Band == band).ToArray(); } Copyright © 2009 SoftServe, Inc.

Music Player – Introducing Factory ,[object Object],[object Object], public class SongFinderFactory { public ISongFinder GiveUsDatabaseSongFinder() { return new SongFinder(); } } public MusicPlayer() { songFinder = SongFinderFactory.GiveUsDatabaseSongFinder(); } Copyright © 2009 SoftServe, Inc.

Another Idea Copyright © 2009 SoftServe, Inc. ,[object Object],public class MusicPlayer { private ISongFinder m_songFinder; public MusicPlayer(ISongFinder songFinder) { m_songFinder = songFinder; } } ,[object Object],[object Object],[object Object],This is Constructor Dependency Injection

MusicPlayer – Introducing Service Locator ,[object Object],[object Object],public static class ServiceLocator { public static void RegisterService(Type type, Object impl) { … } public static Object GetService(Type type) { … } } public MusicPlayer() { var fiderService = ServiceLocator.GetService(typeof (ISongFinder)); songFinder = (ISongFinder)fiderService; } Copyright © 2009 SoftServe, Inc.

Summary Copyright © 2009 SoftServe, Inc. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Inversion of Control and Dependency Injection

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Inversion of Control and Dependency Injection