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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| # Command Sequence | ||
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| With Kledex is possible to create a squence of commands that will be executed in the specified order. | ||
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| First, create the commands that need to be part of the sequence: | ||
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| ```C# | ||
| public class FirstCommand : Command | ||
| { | ||
| } | ||
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| public class SecondCommand : Command | ||
| { | ||
| } | ||
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| public class ThirdCommand : Command | ||
| { | ||
| } | ||
| ``` | ||
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| Next, as you would have done normally create the handlers for your commands. | ||
| The only difference is that the handlers need to implement the **ISequenceCommandHandlerAsync<>** interface. | ||
| The _HandlerAsync_ of this interface accepts an extra parameter which is a _CommandResponse_. | ||
| Kledex will pass automatically the command response of the previous command in the sequence. | ||
| For the first hanlder it would obviously be null. | ||
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| First command handler: | ||
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| ```C# | ||
| public class FirstCommandHandler : ISequenceCommandHandlerAsync<FirstCommand> | ||
| { | ||
| public Task<CommandResponse> HandleAsync(FirstCommand command, CommandResponse previousStepResponse) | ||
| { | ||
| Console.WriteLine("Message from first command handler"); | ||
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| return Task.FromResult(new CommandResponse | ||
| { | ||
| Result = "First result" | ||
| }); | ||
| } | ||
| } | ||
| ``` | ||
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| Second command handler: | ||
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| ```C# | ||
| public class SecondCommandHandler : ISequenceCommandHandlerAsync<SecondCommand> | ||
| { | ||
| public Task<CommandResponse> HandleAsync(SecondCommand command, CommandResponse previousStepResponse) | ||
| { | ||
| Console.WriteLine($"Message from second command handler. Result from first handler: {previousStepResponse.Result}"); | ||
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| return Task.FromResult(new CommandResponse | ||
| { | ||
| Result = "Second result" | ||
| }); | ||
| } | ||
| } | ||
| ``` | ||
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| Third command handler: | ||
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| ```C# | ||
| public class ThirdCommandHandler : ISequenceCommandHandlerAsync<ThirdCommand> | ||
| { | ||
| public Task<CommandResponse> HandleAsync(ThirdCommand command, CommandResponse previousStepResponse) | ||
| { | ||
| Console.WriteLine($"Message from third command handler. Result from second handler: {previousStepResponse.Result}"); | ||
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| return Task.FromResult(new CommandResponse | ||
| { | ||
| Result = "Third result" | ||
| }); | ||
| } | ||
| } | ||
| ``` | ||
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| Last, create a class that inherits from the _CommandSequence_ abstract class and add all your commands: | ||
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| ```C# | ||
| public class SampleCommandSequence : CommandSequence | ||
| { | ||
| public SampleCommandSequence() | ||
| { | ||
| AddCommand(new FirstCommand()); | ||
| AddCommand(new SecondCommand()); | ||
| AddCommand(new ThirdCommand()); | ||
| } | ||
| } | ||
| ``` | ||
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| Use the dispatcher to execute the command sequence: | ||
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| ```C# | ||
| await dispatcher.SendAsync(new SampleCommandSequence()); | ||
| ``` | ||
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| You can also get a result from the sequence which will be the value of the Result property of the command response of the last command in the sequence (in our example of the ThirdCommand): | ||
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| ```C# | ||
| var result = await dispatcher.SendAsync<string>(new SampleCommandSequence()); | ||
| ``` | ||
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| The following is the output generated: | ||
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| ``` | ||
| Message from first command handler | ||
| Message from second command handler. Result from first handler: First result | ||
| Message from third command handler. Result from second handler: Second result | ||
| Final result: Third result | ||
| ``` | ||
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| You can find the sample code [here](https://github.com/lucabriguglia/Kledex/tree/master/samples/Kledex.Sample.CommandSequence) | ||
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| ## Related | ||
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| - [Commands](Commands) | ||
| - [Command Validation](Command-Validation) | ||
| - [Domain Commands With Event Sourcing](With-Event-Sourcing) | ||
| - [Domain Commands Without Event Sourcing](Without-Event-Sourcing) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| # Domain Commands | ||
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| Working with your domain model: | ||
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| - [Domain Commands With Event Sourcing](With-Event-Sourcing) | ||
| - [Domain Commands Without Event Sourcing](Without-Event-Sourcing) |
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,3 +1,15 @@ | ||
| # UI | ||
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| Work in progress... | ||
| The UI package is an experimental package that can be used to display information about an aggregate and its events: | ||
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| ```C# | ||
| var model = await _dispatcher.GetResultAsync(new GetAggregateModel | ||
| { | ||
| AggregateRootId = id | ||
| }); | ||
| ``` | ||
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| The model will contain the list of all events of the aggregate ordered by time stamp descending. | ||
| Further improvements will be made in coming versions. | ||
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| You can find a sample usage [here](https://github.com/lucabriguglia/Kledex/blob/master/samples/Kledex.Sample.EventSourcing/Pages/Edit.cshtml.cs). |
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