{"id":47323,"date":"2023-01-16T19:22:50","date_gmt":"2023-11-07T05:27:38","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bb%a5%e4%b8%8b%e6%98%af%e5%b0%8f%e5%9e%8b%e5%ba%94%e7%94%a8%e7%a8%8b%e5%ba%8f%e4%b8%adcqrs%e4%ba%8b%e4%bb%b6%e6%ba%af%e6%ba%90%e7%9a%84%e9%85%8d%e7%bd%ae%e7%a4%ba%e4%be%8b%ef%bc%9a\/"},"modified":"2024-04-29T10:09:35","modified_gmt":"2024-04-29T02:09:35","slug":"%e4%bb%a5%e4%b8%8b%e6%98%af%e5%b0%8f%e5%9e%8b%e5%ba%94%e7%94%a8%e7%a8%8b%e5%ba%8f%e4%b8%adcqrs%e4%ba%8b%e4%bb%b6%e6%ba%af%e6%ba%90%e7%9a%84%e9%85%8d%e7%bd%ae%e7%a4%ba%e4%be%8b%ef%bc%9a","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bb%a5%e4%b8%8b%e6%98%af%e5%b0%8f%e5%9e%8b%e5%ba%94%e7%94%a8%e7%a8%8b%e5%ba%8f%e4%b8%adcqrs%e4%ba%8b%e4%bb%b6%e6%ba%af%e6%ba%90%e7%9a%84%e9%85%8d%e7%bd%ae%e7%a4%ba%e4%be%8b%ef%bc%9a\/","title":{"rendered":"\u4ee5\u4e0b\u662f\u5c0f\u578b\u5e94\u7528\u7a0b\u5e8f\u4e2dCQRS+\u4e8b\u4ef6\u6eaf\u6e90\u7684\u914d\u7f6e\u793a\u4f8b\uff1a"},"content":{"rendered":"

\u7ecf\u8fc7<\/h1>\n

\u5f53\u8bd5\u56fe\u5728\u672c\u5730\u73af\u5883\u4e2d\u5b9e\u73b0CQRS+\u4e8b\u4ef6\u6eaf\u6e90\u65f6\uff0c\u6211\u8003\u8651\u5230\u662f\u5426\u53ef\u4ee5\u5728\u4e0d\u4f7f\u7528Apache Kafka\u7b49\u6d88\u606f\u961f\u5217\u7684\u60c5\u51b5\u4e0b\u5b9e\u73b0\u4e8b\u4ef6\u68c0\u6d4b\u3002\u6211\u60f3\u5230\u4f7f\u7528PostgreSQL\u7684Pub\/Sub\u529f\u80fd\u53ef\u80fd\u53ef\u4ee5\u5728\u6700\u5c0f\u7a0b\u5ea6\u4e0a\u5b9e\u73b0\uff0c\u6240\u4ee5\u6211\u505a\u4e86\u4e00\u4e2a\u8003\u8651\u5e94\u7528\u7a0b\u5e8f\u3002\u5e94\u7528\u7a0b\u5e8f\u53ef\u4ee5\u5728\u8fd9\u91cc\u627e\u5230\u3002<\/p>\n

\u5982\u679c\u514b\u9686\u4e86<\/p>\n

cd <\/span>src\r\ndocker-compose up -d<\/span> --build<\/span>\r\n<\/code><\/pre>\n
\u6211\u4f1a\u542f\u52a8\u3002<\/p>\n
\u73af\u5883<\/h1>\n
    \n
  • \n
      \u81ea\u4f5c\u691c\u8a0e\u30a2\u30d7\u30ea<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \n
      • \n
          docker-compose<\/ul>\n<\/li>\n<\/ul>\n
           <\/p>\n
            \n
          • \n
              mcr.microsoft.com\/dotnet\/sdk:7.0<\/ul>\n<\/li>\n<\/ul>\n
               <\/p>\n
                \n
              • \n
                  Microsoft.EntityFrameworkCore Version=7.0.0-preview.7.22376.2<\/ul>\n<\/li>\n<\/ul>\n
                   <\/p>\n
                    postgres:14.5-bullseye<\/ul>\n
                    \u73af\u5883\u56fe\u50cf<\/h1>\n
                      \n
                    • \n
                        write_model(eventstore\u7528\u306epostgres)<\/ul>\n<\/li>\n<\/ul>\n
                         <\/p>\n
                          \n
                        • \n
                            read_model(\u53c2\u7167\u7528\u306epostgres)<\/ul>\n<\/li>\n<\/ul>\n
                             <\/p>\n
                              \n
                            • \n
                                Projector(read_model\u3078\u30a4\u30d9\u30f3\u30c8\u3092\u5c04\u5f71\u3059\u308bdotnetcore)<\/ul>\n<\/li>\n<\/ul>\n
                                 <\/p>\n
                                  SampleCmd(write_model\u3078\u30a4\u30d9\u30f3\u30c8\u3092\u8ffd\u52a0\u3059\u308bdotnetcore)<\/ul>\n
                                  \"\u540d\u79f0\u672a\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb.drawio.png\"<\/div>\n
                                  \u6587\u4ef6\u6811\u6458\u5f55 sh\u00f9 l\u00f9)<\/h2>\n
                                  \u251c\u2500\u2500 docker-compose.yml\r\n\u251c\u2500\u2500 dotnet\r\n\u2502   \u251c\u2500\u2500 Dockerfile\r\n\u2502   \u251c\u2500\u2500 docker-entrypoint.sh\r\n\u2502   \u2514\u2500\u2500 src\r\n\u2502       \u251c\u2500\u2500 Domain\r\n\u2502       \u2502   \u251c\u2500\u2500 Domain.csproj\r\n\u2502       \u2502   \u251c\u2500\u2500 EventIdEnum.cs\r\n\u2502       \u2502   \u251c\u2500\u2500 IEventInsert.cs\r\n\u2502       \u2502   \u251c\u2500\u2500 User.cs\r\n\u2502       \u2502   \u251c\u2500\u2500 UserId.cs\r\n\u2502       \u2502   \u251c\u2500\u2500 UserName.cs\r\n\u2502       \u251c\u2500\u2500 Infrastructure\r\n\u2502       \u2502   \u251c\u2500\u2500 DataBase\r\n\u2502       \u2502   \u2502   \u251c\u2500\u2500 Event.cs\r\n\u2502       \u2502   \u2502   \u2514\u2500\u2500 EventstoreContext.cs\r\n\u2502       \u2502   \u251c\u2500\u2500 EventInsert.cs\r\n\u2502       \u2502   \u251c\u2500\u2500 Infrastructure.csproj\r\n\u2502       \u251c\u2500\u2500 Projector\r\n\u2502       \u2502   \u251c\u2500\u2500 Commands.cs\r\n\u2502       \u2502   \u251c\u2500\u2500 DataBase\r\n\u2502       \u2502   \u2502   \u251c\u2500\u2500 SampleDBContext.cs\r\n\u2502       \u2502   \u2502   \u2514\u2500\u2500 User.cs\r\n\u2502       \u2502   \u251c\u2500\u2500 Program.cs\r\n\u2502       \u2502   \u251c\u2500\u2500 Projector.csproj\r\n\u2502       \u2514\u2500\u2500 SampleCmd\r\n\u2502           \u251c\u2500\u2500 Commands.cs\r\n\u2502           \u251c\u2500\u2500 DataBase\r\n\u2502           \u2502   \u251c\u2500\u2500 SampleContext.cs\r\n\u2502           \u2502   \u2514\u2500\u2500 User.cs\r\n\u2502           \u251c\u2500\u2500 Program.cs\r\n\u2502           \u251c\u2500\u2500 SampleCmd.csproj\r\n\u251c\u2500\u2500 read_model\r\n\u2502   \u2514\u2500\u2500 Dockerfile\r\n\u2514\u2500\u2500 write_model\r\n    \u251c\u2500\u2500 Dockerfile\r\n    \u2514\u2500\u2500 initdb\r\n        \u251c\u2500\u2500 eventstore.backup\r\n        \u2514\u2500\u2500 init.sh\r\n<\/code><\/pre>\n
                                  \u9886\u57df\u6216\u4e8b\u4ef6<\/h1>\n
                                  \u6682\u65f6\u5c06\u5176\u8bbe\u4e3a\u4e00\u4e2a\u666e\u901a\u7528\u6237\u8868\u8fdb\u884cCRUD\u7684\u9886\u57df\u3002<\/p>\n
                                  \u57df\u540d (yu4 ming2)<\/h2>\n
                                  \"undefined\"<\/div>\n
                                  \u6d3b\u52a8<\/h2>\n
                                  \n
                                  EventId\u540d\u79f0\u8aac\u660e\u30b9\u30ad\u30fc\u30de\u3063\u307d\u3044\u3082\u306e1UserAdded\u30e6\u30fc\u30b6\u30fc\u3092\u8ffd\u52a0\u3059\u308b{ “type”: “object”, “properties”: { “name”: { “type”: “string” } } }2UserEdited\u30e6\u30fc\u30b6\u30fc\u3092\u7de8\u96c6\u3059\u308b{ “type”: “object”, “properties”: { “id”: { “type”: “string” }, “name”: { “type”: “string” } } }3UserDeleted\u30e6\u30fc\u30b6\u30fc\u3092\u524a\u9664\u3059\u308b{ “type”: “object”, “properties”: { “id”: { “type”: “string” } } }<\/div>\n<\/div>\n
                                  ER\u56fe<\/h2>\n
                                  \"undefined\"<\/div>\n
                                  \u8bf7\u63d0\u4f9bProjector\u7684\u6307\u4ee4\u3002<\/h1>\n
                                  \u6211\u5df2\u7ecf\u4e3a\u6570\u636e\u5e93\u6062\u590d\u51c6\u5907\u597d\u4e86init\uff0c\u5e76\u4e3a\u4e8b\u4ef6\u8ba2\u9605\u51c6\u5907\u597d\u4e86subscription\u3002<\/p>\n
                                  $ <\/span>docker exec<\/span> -it<\/span> dotnet dotnet run --project<\/span> \/root\/src\/Projector help\r\n<\/span>Usage: Projector <Command>\r\n\r\nCommands:\r\n  help            <\/span>Display help.\r\n  init            \r\n  subscription    \r\n  version         Display version.\r\n<\/code><\/pre>\n
                                  \u6062\u590d\u6570\u636e\u5e93\u65f6\u7528\u5230\u7684init\u5185\u5bb9\u6458\u8981<\/h2>\n
                                      \/\/ read_model\u306eSample\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306eDbContext\u3092\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30a4\u30f3\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\u3057\u3066\u3044\u308b.<\/span>\r\n    private<\/span> SampleDBContext<\/span> Smp<\/span> {<\/span> get<\/span>;<\/span> }<\/span>\r\n\r\n    \/\/ write_model\u306eEventstore\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306eDbContext\u3092\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30a4\u30f3\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\u3057\u3066\u3044\u308b.<\/span>\r\n    private<\/span> EventstoreContext<\/span> Ev<\/span> {<\/span> get<\/span>;<\/span> }<\/span>\r\n\r\n    public<\/span> async<\/span> Task<\/span> Init<\/span>()<\/span>\r\n    {<\/span>\r\n        Smp<\/span>.<\/span>Database<\/span>.<\/span>EnsureDeleted<\/span>();<\/span> \/\/ Sample\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u524a\u9664<\/span>\r\n        Smp<\/span>.<\/span>Database<\/span>.<\/span>EnsureCreated<\/span>();<\/span> \/\/ Sample\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u751f\u6210<\/span>\r\n\r\n        \/\/ \u30a4\u30d9\u30f3\u30c8\u5206\u518d\u751f<\/span>\r\n        foreach<\/span> (<\/span>var<\/span> x<\/span> in<\/span> Ev<\/span>.<\/span>Events<\/span>)<\/span>\r\n            Handle<\/span>(<\/span>x<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    \/\/ \u30a4\u30d9\u30f3\u30c8id\u6bce\u306b\u51e6\u7406.users\u30c6\u30fc\u30d6\u30eb\u306binsert\u3057\u305f\u308aupdate\u3057\u305f\u308adelete\u3057\u305f\u308a.<\/span>\r\n    private<\/span> void<\/span> Handle<\/span>(<\/span>Event<\/span> ev<\/span>)<\/span>\r\n    {<\/span>\r\n        if<\/span> (<\/span>Enum<\/span>.<\/span>IsDefined<\/span>(<\/span>typeof<\/span>(<\/span>EventIdEnum<\/span>),<\/span> ev<\/span>.<\/span>EventId<\/span>)<\/span> ==<\/span> false<\/span>)<\/span>\r\n            return<\/span>;<\/span>\r\n\r\n        switch<\/span> ((<\/span>EventIdEnum<\/span>)<\/span>ev<\/span>.<\/span>EventId<\/span>)<\/span>\r\n        {<\/span>\r\n            case<\/span> EventIdEnum<\/span>.<\/span>UserAdded<\/span>:<\/span> UserUpsertHandler<\/span>(<\/span>ev<\/span>.<\/span>Data<\/span>.<\/span>RootElement<\/span>);<\/span> break<\/span>;<\/span>\r\n            case<\/span> EventIdEnum<\/span>.<\/span>UserEdited<\/span>:<\/span> UserUpsertHandler<\/span>(<\/span>ev<\/span>.<\/span>Data<\/span>.<\/span>RootElement<\/span>);<\/span> break<\/span>;<\/span>\r\n            case<\/span> EventIdEnum<\/span>.<\/span>UserDeleted<\/span>:<\/span> UserDeleteHandler<\/span>(<\/span>ev<\/span>.<\/span>Data<\/span>.<\/span>RootElement<\/span>);<\/span> break<\/span>;<\/span>\r\n            default<\/span>:<\/span> throw<\/span> new<\/span> ArgumentException<\/span>(<\/span>$\"not implemented. <\/span>{<\/span>ev<\/span>.<\/span>EventId<\/span>}<\/span>\"<\/span>);<\/span>\r\n        };<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
                                  \u8ba2\u9605\u6d3b\u52a8\u5185\u5bb9\u6458\u8981<\/h2>\n
                                      public<\/span> async<\/span> Task<\/span> Subscription<\/span>(<\/span>EventstoreContext<\/span> ev<\/span>)<\/span>\r\n    {<\/span>\r\n        var<\/span> conn<\/span> =<\/span> (<\/span>NpgsqlConnection<\/span>)<\/span>ev<\/span>.<\/span>Database<\/span>.<\/span>GetDbConnection<\/span>();<\/span>\r\n        conn<\/span>.<\/span>Open<\/span>();<\/span>\r\n\r\n        try<\/span>\r\n        {<\/span>\r\n            conn<\/span>.<\/span>Notification<\/span> +=<\/span> OnNotification<\/span>;<\/span> \r\n\r\n            \/\/ postgresql\u306eLISTEN\u3067\u8cfc\u8aad\u3059\u308b.<\/span>\r\n            using<\/span> var<\/span> cmd<\/span> =<\/span> new<\/span> NpgsqlCommand<\/span>(<\/span>\"LISTEN event_channel\"<\/span>,<\/span> conn<\/span>);<\/span>\r\n            cmd<\/span>.<\/span>ExecuteNonQuery<\/span>();<\/span>\r\n\r\n            while<\/span> (<\/span>Context<\/span>.<\/span>CancellationToken<\/span>.<\/span>IsCancellationRequested<\/span> ==<\/span> false<\/span>)<\/span>\r\n                await<\/span> conn<\/span>.<\/span>WaitAsync<\/span>(<\/span>Context<\/span>.<\/span>CancellationToken<\/span>);<\/span>\r\n        }<\/span>\r\n        catch<\/span> (<\/span>Exception<\/span> ex<\/span>)<\/span> when<\/span> (!(<\/span>ex<\/span> is<\/span> OperationCanceledException<\/span>))<\/span>\r\n        {<\/span>\r\n            Console<\/span>.<\/span>WriteLine<\/span>(<\/span>ex<\/span>.<\/span>ToString<\/span>());<\/span>\r\n        }<\/span>\r\n        finally<\/span>\r\n        {<\/span>\r\n            conn<\/span>.<\/span>Close<\/span>();<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    \/\/ \u30a4\u30d9\u30f3\u30c8\u304c\u767a\u884c\u3055\u308c\u308b\u5ea6\u306b\u51e6\u7406.<\/span>\r\n    private<\/span> void<\/span> OnNotification<\/span>(<\/span>object<\/span> sender<\/span>,<\/span> NpgsqlNotificationEventArgs<\/span> e<\/span>)<\/span>\r\n    {<\/span>\r\n        Console<\/span>.<\/span>WriteLine<\/span>(<\/span>\"event handled: \"<\/span> +<\/span> e<\/span>.<\/span>Payload<\/span>);<\/span>\r\n        Event<\/span>?<\/span> ev<\/span> =<\/span> JsonSerializer<\/span>.<\/span>Deserialize<\/span><<\/span>Event<\/span>>(<\/span>e<\/span>.<\/span>Payload<\/span>,<\/span> new<\/span> JsonSerializerOptions<\/span> \r\n        {<\/span>\r\n            PropertyNameCaseInsensitive<\/span> =<\/span> true<\/span>,<\/span>\r\n        });<\/span>\r\n\r\n        if<\/span> (<\/span>ev<\/span> is<\/span> not<\/span> null<\/span>)<\/span>\r\n            Handle<\/span>(<\/span>ev<\/span>);<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
                                  Eventstore\u6570\u636e\u5e93\u7684\u89e6\u53d1\u5668\u90e8\u5206\u3002<\/h1>\n
                                  \u5c06\u6570\u636e\u52a0\u8f7d\u5230write_model\u7684\u6570\u636e\u5e93\u4e2d\u3002<\/p>\n
                                  \u89e6\u53d1\u6761\u4ef6\uff1a\u5728events\u8868\u4e2d\u8fdb\u884c\u63d2\u5165
                                  \n\u6267\u884c\u5185\u5bb9\uff1a\u901a\u77e5\u63d2\u5165\u7684\u5185\u5bb9<\/p>\n
                                  CREATE<\/span> OR<\/span> REPLACE<\/span> FUNCTION<\/span> public<\/span>.<\/span>event_insert_trigger<\/span>()<\/span>\r\n    RETURNS<\/span> trigger<\/span>\r\n    LANGUAGE<\/span> 'plpgsql'<\/span>\r\n    COST<\/span> 100<\/span>\r\n    VOLATILE<\/span> NOT<\/span> LEAKPROOF<\/span>\r\nAS<\/span> $<\/span>BODY<\/span>$<\/span>\r\nBEGIN<\/span>\r\nPERFORM<\/span> pg_notify<\/span>(<\/span>\r\n\t'event_channel'<\/span>,<\/span>\r\n\trow_to_json<\/span>(<\/span>NEW<\/span>)::<\/span>text<\/span>\r\n);<\/span>\r\n\r\nreturn<\/span> NULL<\/span>;<\/span>\r\nEND<\/span>\r\n$<\/span>BODY<\/span>$<\/span>;<\/span>\r\n\r\nALTER<\/span> FUNCTION<\/span> public<\/span>.<\/span>event_insert_trigger<\/span>()<\/span>\r\n    OWNER<\/span> TO<\/span> postgres<\/span>;<\/span>\r\n\r\nCREATE<\/span> TRIGGER<\/span> event_trigger<\/span>\r\n    AFTER<\/span> INSERT<\/span>\r\n    ON<\/span> public<\/span>.<\/span>events<\/span>\r\n    FOR<\/span> EACH<\/span> ROW<\/span>\r\n    EXECUTE<\/span> FUNCTION<\/span> public<\/span>.<\/span>event_insert_trigger<\/span>();<\/span>\r\n<\/code><\/pre>\n
                                  \u6837\u672c\u547d\u4ee4\uff08SampleCmd\uff09\u7684\u6307\u4ee4<\/h1>\n
                                  \u6682\u65f6\u4f7f\u7528\u63a7\u5236\u53f0\u5e94\u7528\u7a0b\u5e8f\u3002\u4f7f\u7528\u547d\u4ee4\u5982add\u6216edit\uff0c\u6307\u5b9a\u4e8b\u4ef6\u540d\u79f0\u5e76\u9644\u5e26\u5fc5\u8981\u7684\u53c2\u6570\u5c06\u4e8b\u4ef6\u63d2\u5165write_model\u4e2d\u3002<\/p>\n
                                  $ <\/span>docker exec<\/span> -it<\/span> dotnet dotnet run --project<\/span> \/root\/src\/SampleCmd help\r\n<\/span>Usage: SampleCmd [<\/span>options...]\r\n\r\nOptions:\r\n  -e<\/span>, --eventname<\/span> <String>    event name. add or edit or delete (<\/span>Required)<\/span>\r\n  -n<\/span>, --username<\/span> <String>     user name. Required for <\/span>add or edit (<\/span>Default: null)<\/span>\r\n  -id<\/span>, --id<\/span> <String>          guid. Required for <\/span>edit or delete (<\/span>Default: null)<\/span>\r\n\r\nCommands:\r\n  help       <\/span>Display help.\r\n  version    Display version.\r\n<\/code><\/pre>\n
                                  \u603b\u7ed3\u3002<\/h1>\n
                                  \"index.png\"<\/div>\n
                                  \u5982\u679c\u6211\u4eec\u5c06\u4e00\u4e2aPostgreSQL\u6570\u636e\u5e93\u62c6\u5206\u6210\u591a\u4e2a\u6a21\u5f0f\u6765\u7ba1\u7406\uff0c\u53ef\u80fd\u4e5f\u662f\u4e00\u4e2a\u4e0d\u9519\u7684\u9009\u62e9\u3002<\/p>\n
                                  \"index.png\"<\/div>\n
                                  \u5728\u4e8b\u4ef6\u53d1\u751f\u65f6\u6267\u884cProjector\u4f5c\u4e3a\u5916\u90e8\u5e94\u7528\u7a0b\u5e8f\u4f3c\u4e4e\u4e5f\u662f\u4e00\u4e2a\u53ef\u884c\u7684\u9009\u62e9\u3002\u5728\u8fd9\u79cd\u6a21\u5f0f\u4e2d\uff0c\u6062\u590dread_model\u65f6\u9700\u8981\u4f7f\u7528write_model\u7684\u4fe1\u606f\u3002<\/p>\n
                                  \u8bf7\u95ee\u5728\u4f7f\u7528CQRS+\u4e8b\u4ef6\u6eaf\u6e90\u5728\u79c1\u6709\u4e91\u4e2d\u8fdb\u884c\u5b9e\u73b0\u65f6\uff0c\u662f\u5426\u6709\u4efb\u4f55\u65b9\u4fbf\u7684\u673a\u5236\u53ef\u4ee5\u6559\u6388\uff1f<\/p>\n","protected":false},"excerpt":{"rendered":"
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