Domain Commands

Implementing the Domain Change Requests Actions

First, let's implement all the Domain Commands: domain commands are all commands related to an Aggregate 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 of the Event Sourcing Pattern. Then you have to specify every single required information as a field.

Every single AggregateId in the System must be different you cannot use the same ID in different aggregate Types.

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.

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;
    }
}

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;
    }
}

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;
    }
}

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;
    }
}

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;
    }
}