# Domain Commands

First, let's implement all the Domain Commands: domain commands are all commands related to an [Aggregate](/recq-patterns/recq-component-pattern/aggregate.md) and generating events after the approval.

In Evento Framework every Domain Command implement the class `com.evento.common.modeling.messaging.payload.DomainCommand` and needs the `getAggregateId()` method implementation. Thath method returns the **Unique Aggregate Identifier** used to compute the [Aggregate State](/evento-framework/component/aggregate/aggregate-state.md) of the Event Sourcing Pattern. Then you have to specify every single required information as a field.

{% hint style="danger" %}
Every single AggregateId in the System must be different you cannot use the same ID in different aggregate Types.
{% endhint %}

{% hint style="info" %}
Usually, the Resource Identifier (in this case the TodoList Id) is used as an aggregate identifier, and, during the generation, a prefix to identify the aggregate type.
{% endhint %}

```java
import com.evento.common.documentation.Domain;
import com.evento.common.modeling.messaging.payload.DomainCommand;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;

@Domain(name = "TodoList")
@NoArgsConstructor
@AllArgsConstructor
@Getter
@Setter
public class TodoListCreateCommand extends DomainCommand {
    
    // The TodoList identifier
    private String identifier;
    // The TodoList Name
    private String name;
    
    @Override
    public String getAggregateId() {
        return identifier;
    }
}
```

```java
import com.evento.common.documentation.Domain;
import com.evento.common.modeling.messaging.payload.DomainCommand;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;

@Domain(name = "TodoList")
@NoArgsConstructor
@AllArgsConstructor
@Getter
@Setter
public class TodoListDeleteCommand  extends DomainCommand {

    // Identifier of the TodoList to delete
    private String identifier;

    @Override
    public String getAggregateId() {
        return identifier;
    }
}
```

```java
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import com.evento.common.documentation.Domain;
import com.evento.common.modeling.messaging.payload.DomainCommand;

@Domain(name = "TodoList")
@NoArgsConstructor
@AllArgsConstructor
@Getter
@Setter
public class TodoListAddTodoCommand extends DomainCommand {

    // Identifier of the TodoList to update
    private String identifier;
    // Identifier of the To-do to delete
    private String todoIdentifier;
    // The To-do content
    private String content;
    @Override
    public String getAggregateId() {
        return identifier;
    }
}
```

```java
import com.evento.common.documentation.Domain;
import com.evento.common.modeling.messaging.payload.DomainCommand;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;

@Domain(name = "TodoList")
@NoArgsConstructor
@AllArgsConstructor
@Getter
@Setter
public class TodoListRemoveTodoCommand extends DomainCommand {

    // Identifier of the TodoList to update
    private String identifier;
    // Identifier of the To-do to remove
    private String todoIdentifier;
    @Override
    public String getAggregateId() {
        return identifier;
    }
}
```

```java
import com.evento.common.documentation.Domain;
import com.evento.common.modeling.messaging.payload.DomainCommand;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;

@Domain(name = "TodoList")
@NoArgsConstructor
@AllArgsConstructor
@Getter
@Setter
public class TodoListCheckTodoCommand extends DomainCommand {

    // Identifier of the TodoList to update
    private String identifier;
    // Identifier of the To-do to check
    private String todoIdentifier;
    @Override
    public String getAggregateId() {
        return identifier;
    }
}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.eventoframework.com/getting-started/todolist-recq-tutorial/recq-payload-evento-implementation/domain-commands.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.