{"id":33839,"date":"2019-10-31T21:54:56","date_gmt":"2019-10-31T18:54:56","guid":{"rendered":"https:\/\/prohoster.info\/blog\/objectrepository-net-in-memory-repository-pattern-dlya-vashih-domashnih-proektov\/"},"modified":"2019-10-31T21:54:56","modified_gmt":"2019-10-31T18:54:56","slug":"objectrepository-net-in-memory-repository-pattern-dlya-vashih-domashnih-proektov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/objectrepository-net-in-memory-repository-pattern-dlya-vashih-domashnih-proektov","title":{"rendered":"ObjectRepository \u2014 .NET in-memory repository minta az otthoni projektjeidhez","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h2 id=\"zachem-hranit-vse-dannye-v-pamyati\">Mi\u00e9rt t\u00e1roljuk az \u00f6sszes adatot a mem\u00f3ri\u00e1ban?<\/h2>\n<p><\/p>\n<p>A webhely vagy a backend adatainak t\u00e1rol\u00e1s\u00e1hoz a legt\u00f6bb j\u00f3zan \u00e9sz\u0171 ember az SQL adatb\u00e1zist v\u00e1lasztan\u00e1.\u00a0<\/p>\n<p><\/p>\n<p>De n\u00e9ha esz\u00e9be jut, hogy az adatmodell nem megfelel\u0151 az SQL-hez: p\u00e9ld\u00e1ul, amikor keres\u00e9st \u00e9p\u00edt\u00fcnk vagy t\u00e1rsadalmi grafikont, bonyolult kapcsolatokon kell keresni az objektumok k\u00f6z\u00f6tt.\u00a0<\/p>\n<p><\/p>\n<p><strong>A legrosszabb helyzet, amikor csapatban dolgozik, \u00e9s a koll\u00e9ga nem tud gyors lek\u00e9rdez\u00e9seket \u00e9p\u00edteni. Mennyi id\u0151t t\u00f6lt\u00f6tt az N+1 probl\u00e9m\u00e1k megold\u00e1s\u00e1val \u00e9s kieg\u00e9sz\u00edt\u0151 indexek l\u00e9trehoz\u00e1s\u00e1val, hogy a SELECT a f\u0151oldalon \u00e9sszer\u0171 id\u0151 alatt v\u00e9grehajthat\u00f3 legyen?<\/strong><\/p>\n<p><\/p>\n<p>Egy m\u00e1sik n\u00e9pszer\u0171 megk\u00f6zel\u00edt\u00e9s a NoSQL. N\u00e9h\u00e1ny \u00e9vvel ezel\u0151tt hatalmas hype volt k\u00f6r\u00fcl\u00f6tte \u2013 b\u00e1rmilyen k\u00e9nyelmes alkalommal be\u00fczemelt\u00e9k a MongoDB-t \u00e9s \u00f6r\u00fcltek a JSON dokumentumok form\u00e1j\u00e1ban kapott v\u00e1laszoknak. <em>(Am\u00fagy mennyi akad\u00e1lyt kellett beilleszteni a dokumentumok ciklikus hivatkoz\u00e1sai miatt?)<\/em>.<\/p>\n<p><\/p>\n<p>Javaslom, hogy pr\u00f3b\u00e1ljunk ki egy m\u00e1sik, alternat\u00edv m\u00f3dszert \u2013 mi\u00e9rt ne t\u00e1roln\u00e1nk az \u00f6sszes adatot az alkalmaz\u00e1s mem\u00f3ri\u00e1j\u00e1ban, id\u0151nk\u00e9nt mentve egy tetsz\u0151leges t\u00e1rol\u00f3ba (f\u00e1jl, t\u00e1voli adatb\u00e1zis)?\u00a0<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>A mem\u00f3ria olcs\u00f3v\u00e1 v\u00e1lt, \u00e9s a legt\u00f6bb kis- \u00e9s k\u00f6z\u00e9pprojekt minden lehets\u00e9ges adata elf\u00e9r 1 GB mem\u00f3ri\u00e1ban. <em>(P\u00e9ld\u00e1ul, a kedvenc otthoni projektem \u2013 <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/DiverOfDark\/BudgetTracker\">p\u00e9nz\u00fcgyi nyilv\u00e1ntart\u00f3<\/a><\/noindex>, amely napi statisztik\u00e1t \u00e9s a k\u00f6lt\u00e9seim, egyenlegeim \u00e9s tranzakci\u00f3im t\u00f6rt\u00e9net\u00e9t vezeti m\u00e1sf\u00e9l \u00e9vre visszatekintve, mind\u00f6ssze 45 MB mem\u00f3ri\u00e1t haszn\u00e1l.)<\/em><\/p>\n<p><\/p>\n<p>El\u0151ny\u00f6k:<\/p>\n<p><\/p>\n<ul>\n<li>Az adatokhoz val\u00f3 hozz\u00e1f\u00e9r\u00e9s egyszer\u0171bb\u00e9 v\u00e1lik \u2013 nem kell agg\u00f3dni a lek\u00e9rdez\u00e9sek, a k\u00e9sleltetett bet\u00f6lt\u00e9s, az ORM saj\u00e1toss\u00e1gai miatt, a munkav\u00e9gz\u00e9s a szok\u00e1sos C# objektumokkal t\u00f6rt\u00e9nik;<\/li>\n<li>Nincsenek probl\u00e9m\u00e1k a k\u00fcl\u00f6nb\u00f6z\u0151 sz\u00e1lak k\u00f6z\u00f6tti hozz\u00e1f\u00e9r\u00e9ssel;<\/li>\n<li>Nagyon gyors \u2013 nincsenek h\u00e1l\u00f3zati lek\u00e9rdez\u00e9sek, hi\u00e1nyzik a k\u00f3d nyelvre ford\u00edt\u00e1sa, nem sz\u00fcks\u00e9ges az objektumok (de)szerializ\u00e1l\u00e1sa;<\/li>\n<li>Elfogadhat\u00f3 b\u00e1rmilyen form\u00e1ban t\u00e1rolni az adatokat \u2013 ak\u00e1r XML-ben a lemezen, ak\u00e1r SQL Server-ben, ak\u00e1r Azure Table Storage-ban.<\/li>\n<\/ul>\n<p><\/p>\n<p>H\u00e1tr\u00e1nyok:<\/p>\n<p><\/p>\n<ul>\n<li>Elv\u00e9sz a v\u00edzszintes sk\u00e1l\u00e1z\u00e1s lehet\u0151s\u00e9ge, \u00edgy nem lehet zero downtime deployment-et v\u00e9grehajtani;<\/li>\n<li>Ha az alkalmaz\u00e1s le\u00e1ll \u2013 r\u00e9szben elvesz\u00edthetj\u00fck az adatokat. <em>(De hiszen az alkalmaz\u00e1sunk soha nem \u00e1ll le, igaz?)<\/em><\/li>\n<\/ul>\n<p><\/p>\n<h2 id=\"kak-eto-rabotaet\">Hogyan m\u0171k\u00f6dik ez?<\/h2>\n<p><\/p>\n<p>Az algoritmus a k\u00f6vetkez\u0151:<\/p>\n<p><\/p>\n<ul>\n<li>Az ind\u00edt\u00e1skor kapcsolat l\u00e9tes\u00fcl az adatb\u00e1zissal, \u00e9s az adatok bet\u00f6lt\u0151dnek;<\/li>\n<li>Az objektummodell fel\u00e9p\u00fcl, az els\u0151dleges indexek \u00e9s a kapcsolati indexek (1:1, 1:Many) l\u00e9trej\u00f6nnek.<\/li>\n<li>El\u0151fizet\u00e9s k\u00e9sz\u00fcl az objektumok tulajdons\u00e1gainak v\u00e1ltoz\u00e1saira (INotifyPropertyChanged) \u00e9s a gy\u0171jtem\u00e9nybe t\u00f6rt\u00e9n\u0151 elemek hozz\u00e1ad\u00e1s\u00e1ra vagy elt\u00e1vol\u00edt\u00e1s\u00e1ra (INotifyCollectionChanged);<\/li>\n<li>Az el\u0151fizet\u00e9s aktiv\u00e1l\u00e1sakor a megv\u00e1ltozott objektum beker\u00fcl az adathalmoz\u00e1sra v\u00e1r\u00f3 sorba;<\/li>\n<li>Id\u0151szakonk\u00e9nt (id\u0151z\u00edt\u0151 alapj\u00e1n) h\u00e1tt\u00e9rfolyamatban mentj\u00fck a v\u00e1ltoz\u00e1sokat a t\u00e1rol\u00f3ba;<\/li>\n<li>A programb\u00f3l val\u00f3 kil\u00e9p\u00e9skor is mentj\u00fck a v\u00e1ltoz\u00e1sokat a t\u00e1rol\u00f3ba.<\/li>\n<\/ul>\n<p><\/p>\n<h2 id=\"primer-koda\">P\u00e9lda k\u00f3dra<\/h2>\n<p>\n<b class=\"spoiler_title\">Hozz\u00e1adjuk a sz\u00fcks\u00e9ges f\u00fcgg\u0151s\u00e9geket<\/b><\/p>\n<pre><code class=\"cs\">\/\/ \u041e\u0441\u043d\u043e\u0432\u043d\u0430\u044f \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\nInstall-Package OutCode.EscapeTeams.ObjectRepository\n\u00a0 \u00a0\u00a0\n\/\/ \u0425\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0435 \u0434\u0430\u043d\u043d\u044b\u0445, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0431\u0443\u0434\u0443\u0442 \u0441\u043e\u0445\u0440\u0430\u043d\u044f\u0442\u044c\u0441\u044f \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f\n\/\/ \u0418\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0439\u0442\u0435 \u0442\u043e, \u043a\u043e\u0442\u043e\u0440\u044b\u043c \u0431\u0443\u0434\u0435\u0442\u0435 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f.\nInstall-Package OutCode.EscapeTeams.ObjectRepository.File\nInstall-Package OutCode.EscapeTeams.ObjectRepository.LiteDb\nInstall-Package OutCode.EscapeTeams.ObjectRepository.AzureTableStorage\n\u00a0 \u00a0\u00a0\n\/\/ \u041e\u043f\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e - \u0435\u0441\u043b\u0438 \u043d\u0443\u0436\u043d\u043e \u0445\u0440\u0430\u043d\u0438\u0442\u044c \u043c\u043e\u0434\u0435\u043b\u044c \u0434\u0430\u043d\u043d\u044b\u0445 \u0434\u043b\u044f Hangfire\n\/\/ Install-Package OutCode.EscapeTeams.ObjectRepository.Hangfire<\/code><\/pre>\n<p>\n<b class=\"spoiler_title\">Le\u00edrjuk az adatmodellt, amelyet menteni fogunk a t\u00e1rol\u00f3ba<\/b><\/p>\n<pre><code class=\"cs\">public class ParentEntity : BaseEntity\n{\n    public ParentEntity(Guid id) =&gt; Id = id;\n}\n    \npublic class ChildEntity : BaseEntity\n{\n    public ChildEntity(Guid id) =&gt; Id = id;\n    public Guid ParentId { get; set; }\n    public string Value { get; set; }\n}<\/code><\/pre>\n<p>\n<b class=\"spoiler_title\">Ezut\u00e1n az objektummodell:<\/b><\/p>\n<pre><code class=\"cs\">public class ParentModel : ModelBase\n{\n    public ParentModel(ParentEntity entity)\n    {\n        Entity = entity;\n    }\n    \n    public ParentModel()\n    {\n        Entity = new ParentEntity(Guid.NewGuid());\n    }\n    \n    public Guid? NullableId =&gt; null;\n    \n    \/\/ P\u00e9lda 1:Many kapcsolat\n    public IEnumerable Children =&gt; Multiple(x =&gt; x.ParentId);\n    \n    protected override BaseEntity Entity { get; }\n}\n    \npublic class ChildModel : ModelBase\n{\n    private ChildEntity _childEntity;\n    \n    public ChildModel(ChildEntity entity)\n    {\n        _childEntity = entity;\n    }\n    \n    public ChildModel() \n    {\n        _childEntity = new ChildEntity(Guid.NewGuid());\n    }\n    \n    public Guid ParentId\n    {\n        get =&gt; _childEntity.ParentId;\n        set =&gt; UpdateProperty(() =&gt; _childEntity.ParentId, value);\n    }\n    \n    public string Value\n    {\n        get =&gt; _childEntity.Value;\n        set =&gt; UpdateProperty(() =&gt; _childEntity.Value, value);\n    }\n    \n    \/\/ Index keres\u00e9ssel el\u00e9rhet\u0151\n    public ParentModel Parent =&gt; Single(ParentId);\n    \n    protected override BaseEntity Entity =&gt; _childEntity;\n}<\/code><\/pre>\n<p>\n<b class=\"spoiler_title\">V\u00e9g\u00fcl maga az adathozz\u00e1f\u00e9r\u00e9si oszt\u00e1ly:<\/b><\/p>\n<pre><code class=\"cs\">public class MyObjectRepository : ObjectRepositoryBase\n{\n    public MyObjectRepository(IStorage storage) : base(storage, NullLogger.Instance)\n    {\n        IsReadOnly = true; \/\/ Tesztel\u00e9shez, lehet\u0151v\u00e9 teszi a v\u00e1ltoz\u00e1sok nem ment\u00e9s\u00e9t az adatb\u00e1zisba\n    \n        AddType((ParentEntity x) =&gt; new ParentModel(x));\n        AddType((ChildEntity x) =&gt; new ChildModel(x));\n    \n        \/\/ Ha Hangfire-t haszn\u00e1lnak, \u00e9s a Hangfire adatm\u00f3delt kell t\u00e1rolni az ObjectRepository-ban\n        \/\/ this.RegisterHangfireScheme();  \n    \n        Initialize();\n    }\n}<\/code><\/pre>\n<p><\/p>\n<p>L\u00e9trehozzuk az ObjectRepository p\u00e9ld\u00e1ny\u00e1t:<\/p>\n<p><\/p>\n<pre><code class=\"cs\">var memory = new MemoryStream();\nvar db = new LiteDatabase(memory);\nvar dbStorage = new LiteDbStorage(db);\n    \nvar repository = new MyObjectRepository(dbStorage);\nawait repository.WaitForInitialize();<\/code><\/pre>\n<p>\n<b class=\"spoiler_title\">Ha a projektben HangFire-t fognak haszn\u00e1lni<\/b><\/p>\n<pre><code class=\"cs\">public void ConfigureServices(IServiceCollection services, ObjectRepository objectRepository)\n{\n    services.AddHangfire(s =&gt; s.UseHangfireStorage(objectRepository));\n}<\/code><\/pre>\n<p><\/p>\n<p>\u00daj objektum besz\u00far\u00e1sa:<\/p>\n<p><\/p>\n<pre><code class=\"cs\">var newParent = new ParentModel()\nrepository.Add(newParent);<\/code><\/pre>\n<p><\/p>\n<p>Ezen h\u00edv\u00e1s sor\u00e1n az objektum <strong>ParentModel<\/strong> Hozz\u00e1ad\u00f3dik a helyi gyors\u00edt\u00f3t\u00e1rhoz \u00e9s az adatb\u00e1zis \u00edr\u00e1si sor\u00e1hoz is. Ez\u00e9rt ez a m\u0171velet O(1) id\u0151t ig\u00e9nyel, \u00e9s ezzel az objektummal azonnal dolgozhatunk.<\/p>\n<p><\/p>\n<p>P\u00e9ld\u00e1ul, hogy megkeress\u00fck ezt az objektumot a t\u00e1rol\u00f3ban, \u00e9s megbizonyosodjunk arr\u00f3l, hogy a visszat\u00e9r\u0151 objektum ugyanaz a p\u00e9ld\u00e1ny:<\/p>\n<p><\/p>\n<pre><code class=\"cs\">var parents = repository.Set();\nvar myParent = parents.Find(newParent.Id);\nAssert.IsTrue(ReferenceEquals(myParent, newParent));<\/code><\/pre>\n<p><\/p>\n<p>Mi t\u00f6rt\u00e9nik ek\u00f6zben? <em>Set()<\/em> a p\u00e9nzeszk\u00f6z\u00f6ket! M\u00e9g dics\u00e9retet is kap 75-90% -t\u00f3l a r\u00e9sztvev\u0151k k\u00f6z\u00fcl, b\u00e1r a projekt fejl\u0151d\u00e9se nyilv\u00e1nval\u00f3an lelassult. A legmeglep\u0151bb, hogy mindenki <em>TableDictionary<\/em>, amely tartalmazza <em>ConcurrentDictionary<\/em> \u00e9s tov\u00e1bbi funkci\u00f3kat biztos\u00edt az els\u0151dleges \u00e9s m\u00e1sodlagos indexekhez. Ez lehet\u0151v\u00e9 teszi az Id (vagy m\u00e1s \u00f6n\u00e1ll\u00f3 felhaszn\u00e1l\u00f3i indexek) szerinti keres\u00e9st an\u00e9lk\u00fcl, hogy minden objektumot teljes m\u00e9rt\u00e9kben \u00e1tn\u00e9zn\u00e9nk.<\/p>\n<p><\/p>\n<p>Objektumok hozz\u00e1ad\u00e1sakor a <em>ObjectRepository<\/em> regisztr\u00e1l egy figyelmet az objektumok tulajdons\u00e1gainak megv\u00e1ltoz\u00e1s\u00e1ra, \u00edgy b\u00e1rmilyen tulajdons\u00e1gv\u00e1ltoz\u00e1s is a megfelel\u0151 objektumot az \u00edr\u00f3 sorba k\u00fcldi.\u00a0<br \/>\nA tulajdons\u00e1gok k\u00fcls\u0151 friss\u00edt\u00e9se ugyan\u00fagy n\u00e9z ki, mint a POCO-objektummal val\u00f3 munka:<\/p>\n<p><\/p>\n<pre><code class=\"cs\">myParent.Children.First().Property = \"Friss\u00edtett \u00e9rt\u00e9k\";<\/code><\/pre>\n<p><\/p>\n<p>Az objektumot a k\u00f6vetkez\u0151 m\u00f3dokon lehet elt\u00e1vol\u00edtani:<\/p>\n<p><\/p>\n<pre><code class=\"cs\">repository.Remove(myParent);\nrepository.RemoveRange(otherParents);\nrepository.Remove(x =&gt; !x.Children.Any());<\/code><\/pre>\n<p><\/p>\n<p>Ekkor az objektumot is hozz\u00e1adj\u00e1k az elt\u00e1vol\u00edtand\u00f3 sorhoz.<\/p>\n<p><\/p>\n<h2 id=\"kak-rabotaet-sohranenie\">Hogyan m\u0171k\u00f6dik a ment\u00e9s?<\/h2>\n<p><\/p>\n<p><em>ObjectRepository<\/em> az k\u00f6vetkez\u0151 esem\u00e9nyeket aktiv\u00e1lja, ha megv\u00e1ltoztatj\u00e1k a nyomon k\u00f6vetett objektumokat (ak\u00e1r hozz\u00e1ad\u00e1s, elt\u00e1vol\u00edt\u00e1s, ak\u00e1r a tulajdons\u00e1gok m\u00f3dos\u00edt\u00e1sa): <em>ModelChanged<\/em>, amelyre feliratkozott <em>IStorage<\/em>. A megval\u00f3s\u00edt\u00e1sok a <em>IStorage<\/em> esem\u00e9ny bek\u00f6vetkeztekor <em>ModelChanged<\/em> h\u00e1rom sorba sorolj\u00e1k az elt\u00e9r\u00e9seket \u2014 hozz\u00e1ad\u00e1sra, friss\u00edt\u00e9sre \u00e9s elt\u00e1vol\u00edt\u00e1sra.<\/p>\n<p><\/p>\n<p>Tov\u00e1bb\u00e1, a megval\u00f3s\u00edt\u00e1sok inicializ\u00e1l\u00e1skor l\u00e9trehoznak egy id\u0151z\u00edt\u0151t, amely 5 m\u00e1sodpercenk\u00e9nt h\u00edvja a ment\u00e9st. <em>IStorage<\/em> Ezenk\u00edv\u00fcl l\u00e9tezik egy API a ment\u00e9s k\u00e9nyszer\u00edtett v\u00e9grehajt\u00e1s\u00e1hoz:\u00a0<\/p>\n<p><\/p>\n<p><em>ObjectRepository.Save() <strong>Minden ment\u00e9s el\u0151tt a felesleges m\u0171veletek (p\u00e9ld\u00e1ul esem\u00e9nyek duplik\u00e1ci\u00f3i \u2014 amikor az objektum k\u00e9tszer v\u00e1ltozott meg vagy gyors hozz\u00e1ad\u00e1s\/elt\u00e1vol\u00edt\u00e1s t\u00f6rt\u00e9nt) elt\u00e1vol\u00edt\u00e1sa t\u00f6rt\u00e9nik, \u00e9s csak ut\u00e1na zajlik a ment\u00e9s.<\/strong>.<\/em><\/p>\n<p><\/p>\n<p>Minden esetben a teljes, aktu\u00e1lis objektumot mentik, ez\u00e9rt el\u0151fordulhat, hogy az objektumokat m\u00e1s sorrendben mentik, mint ahogy a v\u00e1ltoz\u00e1sok t\u00f6rt\u00e9ntek, bele\u00e9rtve azt is, hogy frissebb verzi\u00f3k ment\u00e9sre ker\u00fclhetnek, mint amik a sorba ker\u00fcltek.\u00a0<\/p>\n<p><\/p>\n<p><em>Minden k\u00f6nyvt\u00e1r a .NET Standard 2.0-ra \u00e9p\u00fcl. B\u00e1rmely modern .NET projektben haszn\u00e1lhat\u00f3.<\/em><\/p>\n<p><\/p>\n<h2 id=\"chto-est-eschyo\">Mi van m\u00e9g?<\/h2>\n<p><\/p>\n<ul>\n<li>.NET Standard 2.0 alap\u00fa. B\u00e1rmely modern .NET projektben haszn\u00e1lhat\u00f3.<\/li>\n<li>Az API sz\u00e1lbiztos. A bels\u0151 gy\u0171jtem\u00e9nyek alapj\u00e1ul szolg\u00e1l\u00f3 <em>ConcurrentDictionary<\/em>, az esem\u00e9nykezel\u0151k pedig blokkol\u00e1sokat haszn\u00e1lnak, vagy nem ig\u00e9nyelnek ilyeneket.\u00a0<br \/>\nAmi fontos megjegyezni, hogy az alkalmaz\u00e1s befejez\u00e9sekor h\u00edvja meg <em>ObjectRepository.Save();<\/em><\/li>\n<li>Tetsz\u0151leges indexek (egyedis\u00e9g sz\u00fcks\u00e9ges):<\/li>\n<\/ul>\n<p><\/p>\n<pre><code class=\"cs\">repository.Set&lt;ChildModel&gt;().AddIndex(x =&gt; x.Value);\nrepository.Set&lt;ChildModel&gt;().Find(x =&gt; x.Value, \"myValue\");<\/code><\/pre>\n<p><\/p>\n<h2 id=\"kto-eto-ispolzuet\">Ki haszn\u00e1lja ezt?<\/h2>\n<p><\/p>\n<p>Szem\u00e9ly szerint \u00e9n ezt a megk\u00f6zel\u00edt\u00e9st kezdtem alkalmazni minden hobbiprojektben, mert k\u00e9nyelmes, \u00e9s nem ig\u00e9nyel nagy k\u00f6lts\u00e9get az adatel\u00e9r\u00e9si r\u00e9teg \u00edr\u00e1s\u00e1hoz vagy neh\u00e9z infrastrukt\u00fara fel\u00e9p\u00edt\u00e9s\u00e9hez. Sz\u00e1momra \u00e1ltal\u00e1ban elegend\u0151 az adatok t\u00e1rol\u00e1sa litedb-ben vagy f\u00e1jlban.\u00a0<\/p>\n<p><\/p>\n<p>De a m\u00faltban, amikor a csapatommal k\u00e9sz\u00edtett\u00fck a m\u00e1r megsz\u0171nt EscapeTeams startupot (<em>gondoltam, hogy itt vannak a p\u00e9nzek \u2013 de nem, \u00fajra csak tapasztalat<\/em>) \u2013 adataink t\u00e1rol\u00e1s\u00e1ra Azure Table Storage-t haszn\u00e1ltunk.<\/p>\n<p><\/p>\n<h2 id=\"plany-na-buduschee\">J\u00f6v\u0151beli tervek<\/h2>\n<p><\/p>\n<p>Szeretn\u00e9nk megoldani ennek a megk\u00f6zel\u00edt\u00e9snek az egyik f\u0151 h\u00e1tr\u00e1ny\u00e1t \u2014 a horizont\u00e1lis sk\u00e1l\u00e1z\u00e1st. Ehhez vagy elosztott tranzakci\u00f3kra van sz\u00fcks\u00e9g (sic!), vagy el kell fogadni, hogy az azonos adatok k\u00fcl\u00f6nb\u00f6z\u0151 p\u00e9ld\u00e1nyai nem v\u00e1ltozhatnak, vagy legyenek v\u00e1ltoz\u00e1sok a &#171;aki utols\u00f3, az nyer&#187; elv alapj\u00e1n.<\/p>\n<p><\/p>\n<p>Technikai szempontb\u00f3l az al\u00e1bbi s\u00e9ma lehets\u00e9gesnek t\u0171nik:<\/p>\n<p><\/p>\n<ul>\n<li>Az objektummodell helyett EventLog-ot \u00e9s Snapshot-ot t\u00e1rolni<\/li>\n<li>M\u00e1s p\u00e9ld\u00e1nyokat tal\u00e1lni (hozz\u00e1adni az \u00f6sszes p\u00e9ld\u00e1ny v\u00e9gpontjait a be\u00e1ll\u00edt\u00e1sokhoz? udp felfedez\u00e9s? master\/slave?)<\/li>\n<li>Replik\u00e1lni az EventLog-ot a p\u00e9ld\u00e1nyok k\u00f6z\u00f6tt b\u00e1rmely konszenzus algoritmus, p\u00e9ld\u00e1ul RAFT seg\u00edts\u00e9g\u00e9vel.<\/li>\n<\/ul>\n<p><\/p>\n<p>Van m\u00e9g egy probl\u00e9ma, ami aggaszt \u2013 a kaszk\u00e1dos t\u00f6rl\u00e9s, vagy az objektumok t\u00f6rl\u00e9s\u00e9nek \u00e9szlel\u00e9se, amelyekre hivatkoz\u00e1sok vannak m\u00e1s objektumokb\u00f3l.\u00a0<\/p>\n<p><\/p>\n<h2 id=\"ishodnyy-kod\">Forr\u00e1sk\u00f3d<\/h2>\n<p><\/p>\n<p>Ha eddig eljutott\u00e1l \u2013 csak a k\u00f3dot kell \u00e1tn\u00e9zni, amit megtal\u00e1lhatsz a GitHub-on:<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/DiverOfDark\/ObjectRepository\">https:\/\/github.com\/DiverOfDark\/ObjectRepository<\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/452232\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0417\u0430\u0447\u0435\u043c \u0445\u0440\u0430\u043d\u0438\u0442\u044c \u0432\u0441\u0435 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u043f\u0430\u043c\u044f\u0442\u0438? \u0414\u043b\u044f \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0441\u0430\u0439\u0442\u0430 \u0438\u043b\u0438 \u0431\u0435\u043a\u044d\u043d\u0434\u0430 \u043f\u0435\u0440\u0432\u044b\u043c \u0436\u0435\u043b\u0430\u043d\u0438\u0435\u043c \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u0430 \u0437\u0434\u0440\u0430\u0432\u043e\u043c\u044b\u0441\u043b\u044f\u0449\u0438\u0445 \u043b\u044e\u0434\u0435\u0439 \u0432\u044b\u0431\u0435\u0440\u0435\u0442 SQL \u0431\u0430\u0437\u0443 \u0434\u0430\u043d\u043d\u044b\u0445.\u00a0 \u041d\u043e \u0438\u043d\u043e\u0433\u0434\u0430 \u0432 \u0433\u043e\u043b\u043e\u0432\u0443 \u043f\u0440\u0438\u0445\u043e\u0434\u0438\u0442 \u043c\u044b\u0441\u043b\u044c \u0447\u0442\u043e \u043c\u043e\u0434\u0435\u043b\u044c \u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0435 \u043f\u043e\u0434\u0445\u043e\u0434\u0438\u0442 \u0434\u043b\u044f SQL: \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043f\u0440\u0438 \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u0438 \u043f\u043e\u0438\u0441\u043a\u0430 \u0438\u043b\u0438 \u0441\u043e\u0446\u0438\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0433\u0440\u0430\u0444\u0430 \u043d\u0443\u0436\u0435\u043d \u043f\u043e\u0438\u0441\u043a \u043f\u043e \u0441\u043b\u043e\u0436\u043d\u044b\u043c \u0441\u0432\u044f\u0437\u044f\u043c \u043c\u0435\u0436\u0434\u0443 \u043e\u0431\u044a\u0435\u043a\u0442\u0430\u043c\u0438.\u00a0 \u0425\u0443\u0436\u0435 \u0432\u0441\u0435\u0433\u043e \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u044f, \u043a\u043e\u0433\u0434\u0430 \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442\u0435 \u0432 \u043a\u043e\u043c\u0430\u043d\u0434\u0435, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-33839","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0417\u0430\u0447\u0435\u043c \u0445\u0440\u0430\u043d\u0438\u0442\u044c \u0432\u0441\u0435 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u043f\u0430\u043c\u044f\u0442\u0438? 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