{"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\/sk\/blog\/news\/objectrepository-net-in-memory-repository-pattern-dlya-vashih-domashnih-proektov","title":{"rendered":"ObjectRepository \u2014 .NET in-memory repository pattern pre va\u0161e dom\u00e1ce projekty","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h2 id=\"zachem-hranit-vse-dannye-v-pamyati\">Pre\u010do uchov\u00e1va\u0165 v\u0161etky d\u00e1ta v pam\u00e4ti?<\/h2>\n<p><\/p>\n<p>Na ukladanie d\u00e1t webu alebo backendu si v\u00e4\u010d\u0161ina rozumn\u00fdch \u013eud\u00ed ako prv\u00fa vo\u013ebu vyberie SQL datab\u00e1zu.\u00a0<\/p>\n<p><\/p>\n<p>Ale niekedy sa objav\u00ed my\u0161lienka, \u017ee d\u00e1tov\u00fd model nie je vhodn\u00fd pre SQL: napr\u00edklad pri budovan\u00ed vyh\u013ead\u00e1vania alebo soci\u00e1lneho grafu potrebujeme vyh\u013ead\u00e1vanie zlo\u017eit\u00fdch vz\u0165ahov medzi objektmi.\u00a0<\/p>\n<p><\/p>\n<p><strong>Najhor\u0161ie je, ke\u010f pracujete v t\u00edme a kolega nevie vytv\u00e1ra\u0165 r\u00fdchle dotazy. Ko\u013eko \u010dasu ste str\u00e1vili rie\u0161en\u00edm probl\u00e9mov N+1 a vytv\u00e1ran\u00edm dodato\u010dn\u00fdch indexov, aby SELECT na hlavnej str\u00e1nke fungoval v rozumnom \u010dase?<\/strong><\/p>\n<p><\/p>\n<p>In\u00fdm popul\u00e1rnym pr\u00edstupom je NoSQL. Pred nieko\u013ek\u00fdmi rokmi bol okolo tohto t\u00e9my ve\u013ek\u00fd rozruch \u2014 pri ka\u017edej vhodnej pr\u00edle\u017eitosti sme nasadili MongoDB a te\u0161ili sa z odpoved\u00ed vo forme json-dokumentov. <em>(inak, ko\u013eko obmedzen\u00ed ste museli zavies\u0165 kv\u00f4li cyklick\u00fdm odkazom v dokumentoch?)<\/em>.<\/p>\n<p><\/p>\n<p>Navrhujem vysk\u00fa\u0161a\u0165 \u010fal\u0161\u00ed alternat\u00edvny pr\u00edstup \u2014 pre\u010do nesk\u00fasi\u0165 uchov\u00e1va\u0165 v\u0161etky d\u00e1ta v pam\u00e4ti aplik\u00e1cie a ob\u010das ich uklada\u0165 do \u013eubovo\u013en\u00e9ho \u00falo\u017eiska (s\u00fabor, vzdialen\u00e1 datab\u00e1za)?\u00a0<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Pam\u00e4\u0165 sa stala lacnou a takmer v\u0161etky mo\u017en\u00e9 d\u00e1ta v\u00e4\u010d\u0161iny mal\u00fdch a stredn\u00fdch projektov sa zmestia do 1 GB pam\u00e4te. <em>(Napr\u00edklad, m\u00f4j ob\u013e\u00faben\u00fd dom\u00e1ci projekt \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/DiverOfDark\/BudgetTracker\">finan\u010dn\u00fd sledova\u010d<\/a><\/noindex>, ktor\u00fd sleduje denn\u00e9 \u0161tatistiky a hist\u00f3riu mojich v\u00fddavkov, zostatkov a transakci\u00ed za jeden a pol roka, spotrebov\u00e1va iba 45 MB pam\u00e4te.)<\/em><\/p>\n<p><\/p>\n<p>V\u00fdhody:<\/p>\n<p><\/p>\n<ul>\n<li>Pr\u00edstup k d\u00e1tam sa st\u00e1va jednoduch\u0161\u00edm \u2014 netreba sa zaobera\u0165 dotazmi, leniv\u00fdm na\u010d\u00edtavan\u00edm, \u0161pecifikami ORM, pr\u00e1ca sa vykon\u00e1va s oby\u010dajn\u00fdmi C# objektami;<\/li>\n<li>\u017diadne probl\u00e9my s pr\u00edstupom z r\u00f4znych vl\u00e1ken;<\/li>\n<li>Ve\u013emi r\u00fdchlo \u2014 \u017eiadne sie\u0165ov\u00e9 po\u017eiadavky, absentuje preklad k\u00f3du do jazyka dotazov, nie je potrebn\u00e1 (de)serializ\u00e1cia objektov;<\/li>\n<li>Je pr\u00edpustn\u00e9 uchov\u00e1va\u0165 d\u00e1ta v akomko\u013evek form\u00e1te \u2014 \u010di u\u017e v XML na disku, SQL Serveri alebo Azure Table Storage.<\/li>\n<\/ul>\n<p><\/p>\n<p>Nev\u00fdhody:<\/p>\n<p><\/p>\n<ul>\n<li>Str\u00e1ca sa horizont\u00e1lne \u0161k\u00e1lovanie, a ako n\u00e1sledok nie je mo\u017en\u00e9 vykona\u0165 zero downtime deployment;<\/li>\n<li>Ak aplik\u00e1cia spadne \u2014 m\u00f4\u017eeme \u010das\u0165 d\u00e1t strati\u0165. <em>(Ale na\u0161a aplik\u00e1cia predsa nikdy nepad\u00e1, v\u0161ak?)<\/em><\/li>\n<\/ul>\n<p><\/p>\n<h2 id=\"kak-eto-rabotaet\">Ako to funguje?<\/h2>\n<p><\/p>\n<p>Algoritmus je nasledovn\u00fd:<\/p>\n<p><\/p>\n<ul>\n<li>Na za\u010diatku sa nadv\u00e4zuje spojenie s \u00falo\u017eiskom d\u00e1t a doch\u00e1dza k na\u010d\u00edtaniu d\u00e1t;<\/li>\n<li>Buduje sa objektov\u00fd model, prim\u00e1rne indexy a indexy vz\u0165ahov (1:1, 1:Many);<\/li>\n<li>Vytv\u00e1ra sa predplatn\u00e9 na zmeny vlastnost\u00ed objektov (INotifyPropertyChanged) a na prid\u00e1vanie alebo odstra\u0148ovanie prvkov v kolekcii (INotifyCollectionChanged);<\/li>\n<li>Pri spusten\u00ed predplatn\u00e9ho sa zmenen\u00fd objekt prid\u00e1va do radu na z\u00e1pis do \u00falo\u017eiska d\u00e1t;<\/li>\n<li>Pravidelne (pod\u013ea \u010dasova\u010da) sa v pozad\u00ed ukladaj\u00fa zmeny do \u00falo\u017eiska;<\/li>\n<li>Pri ukon\u010den\u00ed aplik\u00e1cie sa taktie\u017e ukladaj\u00fa zmeny do \u00falo\u017eiska.<\/li>\n<\/ul>\n<p><\/p>\n<h2 id=\"primer-koda\">Pr\u00edklad k\u00f3du<\/h2>\n<p>\n<b class=\"spoiler_title\">Prid\u00e1vame potrebn\u00e9 z\u00e1vislosti<\/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\">Opisujeme model d\u00e1t, ktor\u00fd sa bude uklada\u0165 do \u00falo\u017eiska<\/b><\/p>\n<pre><code class=\"cs\">public class ParentEntity : BaseEntity\n{\n\u00a0 \u00a0 public ParentEntity(Guid id) =&gt; Id = id;\n}\n\u00a0 \u00a0 \npublic class ChildEntity : BaseEntity\n{\n\u00a0 \u00a0 public ChildEntity(Guid id) =&gt; Id = id;\n\u00a0 \u00a0 public Guid ParentId { get; set; }\n\u00a0 \u00a0 public string Value { get; set; }\n}<\/code><\/pre>\n<p>\n<b class=\"spoiler_title\">Potom objektov\u00fd model:<\/b><\/p>\n<pre><code class=\"cs\">public class ParentModel : ModelBase\n{\n\u00a0 \u00a0 public ParentModel(ParentEntity entity)\n\u00a0 \u00a0 {\n\u00a0 \u00a0 \u00a0 \u00a0 Entity = entity;\n\u00a0 \u00a0 }\n\u00a0 \u00a0 \n\u00a0 \u00a0 public ParentModel()\n\u00a0 \u00a0 {\n\u00a0 \u00a0 \u00a0 \u00a0 Entity = new ParentEntity(Guid.NewGuid());\n\u00a0 \u00a0 }\n\u00a0 \u00a0 \n\u00a0 \u00a0 public Guid? NullableId =&gt; null;\n\u00a0 \u00a0 \n\u00a0 \u00a0 \/\/ Pr\u00edklad vz\u0165ahu 1:Many\n\u00a0 \u00a0 public IEnumerable Children =&gt; Multiple(x =&gt; x.ParentId);\n\u00a0 \u00a0 \n\u00a0 \u00a0 protected override BaseEntity Entity { get; }\n}\n\u00a0 \u00a0 \npublic class ChildModel : ModelBase\n{\n\u00a0 \u00a0 private ChildEntity _childEntity;\n\u00a0 \u00a0 \n\u00a0 \u00a0 public ChildModel(ChildEntity entity)\n\u00a0 \u00a0 {\n\u00a0 \u00a0 \u00a0 \u00a0 _childEntity = entity;\n\u00a0 \u00a0 }\n\u00a0 \u00a0 \n\u00a0 \u00a0 public ChildModel() \n\u00a0 \u00a0 {\n\u00a0 \u00a0 \u00a0 \u00a0 _childEntity = new ChildEntity(Guid.NewGuid());\n\u00a0 \u00a0 }\n\u00a0 \u00a0 \n\u00a0 \u00a0 public Guid ParentId\n\u00a0 \u00a0 {\n\u00a0 \u00a0 \u00a0 \u00a0 get =&gt; _childEntity.ParentId;\n\u00a0 \u00a0 \u00a0 \u00a0 set =&gt; UpdateProperty(() =&gt; _childEntity.ParentId, value);\n\u00a0 \u00a0 }\n\u00a0 \u00a0 \n\u00a0 \u00a0 public string Value\n\u00a0 \u00a0 {\n\u00a0 \u00a0 \u00a0 \u00a0 get =&gt; _childEntity.Value;\n\u00a0 \u00a0 \u00a0 \u00a0 set =&gt; UpdateProperty(() =&gt; _childEntity.Value, value\n\u00a0 \u00a0 }\n\u00a0 \u00a0 \n\u00a0 \u00a0 \/\/ Pr\u00edstup s h\u013eadan\u00edm pod\u013ea indexu\n\u00a0 \u00a0 public ParentModel Parent =&gt; Single(ParentId);\n\u00a0 \u00a0 \n\u00a0 \u00a0 protected override BaseEntity Entity =&gt; _childEntity;\n}<\/code><\/pre>\n<p>\n<b class=\"spoiler_title\">A nakoniec, samotn\u00e1 trieda-repozit\u00e1r pre pr\u00edstup k d\u00e1tam:<\/b><\/p>\n<pre><code class=\"cs\">public class MyObjectRepository : ObjectRepositoryBase\n{\n\u00a0 \u00a0 public MyObjectRepository(IStorage storage) : base(storage, NullLogger.Instance)\n\u00a0 \u00a0 {\n\u00a0 \u00a0 \u00a0 \u00a0 IsReadOnly = true; \/\/ Na testy, umo\u017e\u0148uje neulo\u017ei\u0165 zmeny do datab\u00e1zy\n\u00a0 \u00a0  \n\u00a0 \u00a0 \u00a0 \u00a0 AddType((ParentEntity x) =&gt; new ParentModel(x));\n\u00a0 \u00a0 \u00a0 \u00a0 AddType((ChildEntity x) =&gt; new ChildModel(x));\n\u00a0 \u00a0  \n\u00a0 \u00a0 \u00a0 \u00a0 \/\/ Ak sa pou\u017e\u00edva Hangfire a je potrebn\u00e9 ulo\u017ei\u0165 model d\u00e1t pre Hangfire v ObjectRepository\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/ this.RegisterHangfireScheme();\n\u00a0 \u00a0  \n\u00a0 \u00a0 \u00a0 \u00a0 Initialize();\n\u00a0 \u00a0 }\n}<\/code><\/pre>\n<p><\/p>\n<p>Vytv\u00e1rame in\u0161tanciu ObjectRepository:<\/p>\n<p><\/p>\n<pre><code class=\"cs\">var memory = new MemoryStream();\nvar db = new LiteDatabase(memory);\nvar dbStorage = new LiteDbStorage(db);\n\u00a0 \u00a0 \nvar repository = new MyObjectRepository(dbStorage);\nawait repository.WaitForInitialize();<\/code><\/pre>\n<p>\n<b class=\"spoiler_title\">Ak sa v projekte bude pou\u017e\u00edva\u0165 HangFire<\/b><\/p>\n<pre><code class=\"cs\">public void ConfigureServices(IServiceCollection services, ObjectRepository objectRepository)\n{\n\u00a0 \u00a0 services.AddHangfire(s =&gt; s.UseHangfireStorage(objectRepository));\n}<\/code><\/pre>\n<p><\/p>\n<p>Vlo\u017een\u00ed nov\u00e9ho objektu:<\/p>\n<p><\/p>\n<pre><code class=\"cs\">var newParent = new ParentModel()\nrepository.Add(newParent);<\/code><\/pre>\n<p><\/p>\n<p>Pri tomto volan\u00ed objekt <strong>ParentModel<\/strong> prid\u00e1va sa do lok\u00e1lneho cache a do frontu na z\u00e1pis do datab\u00e1zy. Preto t\u00e1to oper\u00e1cia trv\u00e1 O(1) a s t\u00fdmto objektom sa d\u00e1 okam\u017eite pracova\u0165.<\/p>\n<p><\/p>\n<p>Napr\u00edklad, aby sme na\u0161li tento objekt v \u00falo\u017eisku a uistili sa, \u017ee vr\u00e1ten\u00fd objekt je t\u00fdm ist\u00fdm exempl\u00e1rom:<\/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>\u010co sa pritom deje? <em>Set()<\/em> vracia <em>TableDictionary<\/em>, ktor\u00fd obsahuje v sebe <em>ConcurrentDictionary<\/em> a poskytuje \u010fal\u0161iu funk\u010dnos\u0165 prim\u00e1rnych a sekund\u00e1rnych indexov. To umo\u017e\u0148uje ma\u0165 met\u00f3dy na vyh\u013ead\u00e1vanie pod\u013ea Id (alebo in\u00fdch \u013eubovo\u013en\u00fdch pou\u017e\u00edvate\u013esk\u00fdch indexov) bez \u00fapln\u00e9ho prech\u00e1dzania v\u0161etk\u00fdmi objektmi.<\/p>\n<p><\/p>\n<p>Pri prid\u00e1van\u00ed objektov do <em>ObjectRepository<\/em> sa prid\u00e1va odber na zmenu ich vlastnost\u00ed, tak\u017ee ak\u00e9ko\u013evek zmeny vlastnost\u00ed ved\u00fa aj k pridaniu tohto objektu do frontu na z\u00e1pis.\u00a0<br \/>\nAktualiz\u00e1cia vlastnost\u00ed zvonka vyzer\u00e1 rovnako, ako pr\u00e1ca s POCO objektom:<\/p>\n<p><\/p>\n<pre><code class=\"cs\">myParent.Children.First().Property = \"Updated value\";<\/code><\/pre>\n<p><\/p>\n<p>Objekt je mo\u017en\u00e9 vymaza\u0165 nasleduj\u00facimi sp\u00f4sobmi:<\/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>Pri tom sa tie\u017e objekt prid\u00e1va do frontu na vymazanie.<\/p>\n<p><\/p>\n<h2 id=\"kak-rabotaet-sohranenie\">Ako funguje ulo\u017eenie?<\/h2>\n<p><\/p>\n<p><em>ObjectRepository<\/em> pri zmene sledovan\u00fdch objektov (\u010di u\u017e pri prid\u00e1van\u00ed, odstra\u0148ovan\u00ed alebo zmene vlastnost\u00ed) vyvol\u00e1va udalos\u0165 <em>ModelChanged<\/em>, na ktor\u00fa je prihl\u00e1sen\u00fd <em>IStorage<\/em>. Implement\u00e1cie <em>IStorage<\/em> pri vzniku udalosti <em>ModelChanged<\/em> zhroma\u017e\u010fuj\u00fa zmeny do 3 frontov \u2014 na pridanie, na aktualiz\u00e1ciu a na vymazanie.<\/p>\n<p><\/p>\n<p>Tie\u017e implement\u00e1cie <em>IStorage<\/em> pri inicializ\u00e1cii vytv\u00e1raj\u00fa \u010dasova\u010d, ktor\u00fd ka\u017ed\u00fdch 5 sek\u00fand vyvol\u00e1va ulo\u017eenie zmien.\u00a0<\/p>\n<p><\/p>\n<p><em>Okrem toho existuje API na n\u00faten\u00e9 vyvolanie ulo\u017eenia: <strong>ObjectRepository.Save()<\/strong>.<\/em><\/p>\n<p><\/p>\n<p>Pred ka\u017ed\u00fdm ulo\u017een\u00edm sa najprv odstra\u0148uj\u00fa z frontov bezpredmetn\u00e9 oper\u00e1cie (napr\u00edklad duplicity udalost\u00ed \u2014 ke\u010f sa objekt menil dvakr\u00e1t alebo r\u00fdchle prid\u00e1vanie\/odstra\u0148ovanie objektov), a potom nasleduje samotn\u00e9 ulo\u017eenie.\u00a0<\/p>\n<p><\/p>\n<p><em>Vo v\u0161etk\u00fdch pr\u00edpadoch sa uklad\u00e1 aktu\u00e1lny objekt v celku, preto m\u00f4\u017ee nasta\u0165 situ\u00e1cia, kedy sa objekty ukladaj\u00fa v inom porad\u00ed, ako sa menili, vr\u00e1tane toho, \u017ee sa m\u00f4\u017eu uklada\u0165 nov\u0161ie verzie objektov, ako v \u010dase pridania do frontu.<\/em><\/p>\n<p><\/p>\n<h2 id=\"chto-est-eschyo\">\u010co je e\u0161te?<\/h2>\n<p><\/p>\n<ul>\n<li>V\u0161etky kni\u017enice s\u00fa zalo\u017een\u00e9 na .NET Standard 2.0. M\u00f4\u017ee sa pou\u017e\u00edva\u0165 v akomko\u013evek modernom .NET projekte.<\/li>\n<li>API je thread-safe. Intern\u00e9 kolekcie s\u00fa implementovan\u00e9 na b\u00e1ze <em>ConcurrentDictionary<\/em>, spr\u00e1vcovia udalost\u00ed maj\u00fa bu\u010f zamykania, alebo ich nepotrebuj\u00fa.\u00a0<br \/>\nJedin\u00e9, na \u010do treba pam\u00e4ta\u0165 \u2014 pri ukon\u010den\u00ed aplik\u00e1cie zavola\u0165 <em>ObjectRepository.Save();<\/em><\/li>\n<li>\u010eal\u0161ie indexy (vy\u017eaduj\u00fa jedine\u010dnos\u0165):<\/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\">Kto to pou\u017e\u00edva?<\/h2>\n<p><\/p>\n<p>Osobne som za\u010dal pou\u017e\u00edva\u0165 tento pr\u00edstup vo v\u0161etk\u00fdch svojich hobby projektoch, preto\u017ee je to pohodln\u00e9 a nevy\u017eaduje ve\u013ek\u00e9 n\u00e1klady na p\u00edsanie vrstvy pr\u00edstupu k \u00fadajom alebo nasadzovanie \u0165a\u017ekej infra\u0161trukt\u00fary. Osobne mi zvy\u010dajne sta\u010d\u00ed ukladanie \u00fadajov v litedb alebo v s\u00fabore.\u00a0<\/p>\n<p><\/p>\n<p>Ale v minulosti, ke\u010f sme s t\u00edmom robili teraz u\u017e neexistuj\u00faci startup EscapeTeams (<em>myslel som si, \u017ee toto je cesta k peniazom \u2014 a nie, op\u00e4\u0165 sk\u00fasenos\u0165<\/em>) \u2014 pou\u017e\u00edvali sme na ukladanie \u00fadajov Azure Table Storage.<\/p>\n<p><\/p>\n<h2 id=\"plany-na-buduschee\">Pl\u00e1ny do bud\u00facnosti<\/h2>\n<p><\/p>\n<p>Chcem opravi\u0165 jednu z hlavn\u00fdch nev\u00fdhod tohto pr\u00edstupu \u2014 horizont\u00e1lne \u0161k\u00e1lovanie. Na to s\u00fa potrebn\u00e9 bu\u010f distribuovan\u00e9 transakcie (sic!), alebo prija\u0165 rozhodnutie, \u017ee rovnak\u00e9 \u00fadaje z r\u00f4znych in\u0161tanci\u00ed sa nemaj\u00fa meni\u0165, alebo nech sa menia pod\u013ea z\u00e1sady \u201ekto posledn\u00fd, ten m\u00e1 pravdu\u201c.<\/p>\n<p><\/p>\n<p>Z technick\u00e9ho h\u013eadiska vid\u00edm ako mo\u017en\u00fa nasleduj\u00facu sch\u00e9mu:<\/p>\n<p><\/p>\n<ul>\n<li>Uklada\u0165 namiesto objektov\u00e9ho modelu EventLog a Snapshot<\/li>\n<li>N\u00e1js\u0165 in\u00e9 in\u0161tancie (prida\u0165 do nastaven\u00ed koncov\u00e9 body v\u0161etk\u00fdch in\u0161tanci\u00ed? UDP objavovanie? master\/slave?)<\/li>\n<li>Replikova\u0165 medzi in\u0161tanciami EventLog pomocou ak\u00e9hoko\u013evek z konsenzu\u00e1lnych algoritmov, napr\u00edklad RAFT.<\/li>\n<\/ul>\n<p><\/p>\n<p>Je tu aj in\u00fd probl\u00e9m, ktor\u00fd ma tr\u00e1pi \u2014 kask\u00e1dov\u00e9 mazanie alebo zistenie pr\u00edpadov mazania objektov, na ktor\u00e9 s\u00fa odkazy z in\u00fdch objektov.\u00a0<\/p>\n<p><\/p>\n<h2 id=\"ishodnyy-kod\">Zdrojov\u00fd k\u00f3d<\/h2>\n<p><\/p>\n<p>Ak ste do\u010d\u00edtali a\u017e sem \u2014 zost\u00e1va u\u017e len \u010d\u00edta\u0165 k\u00f3d, ten n\u00e1jdete na GitHub:<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/DiverOfDark\/ObjectRepository\">https:\/\/github.com\/DiverOfDark\/ObjectRepository<\/a><\/noindex><\/p>\n<p>Zdroj: <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 5.0.5 - 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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