Command Pattern

command Dispatcher

• implement a centralized mechanism for handling commands.

• The pattern separates the responsibilities of command execution and command dispatching into separate classes.

How

• commands are represented as objects that contain all the necessary information to perform a specific action

• The command dispatcher receives the command object and routes it to the appropriate command handler based on its type.

• The command handler then executes the command and returns the result.

Benefits

• Centralized control:

  • The pattern provides a centralized control mechanism for handling commands, making it easier to manage and maintain the codebase.

• Decoupling of components:

  • The pattern decouples the components responsible for command dispatching and command execution, which promotes better modularity and flexibility in the codebase.

• Extensibility:

  • The pattern can be extended easily to handle new types of commands, as each command type can be associated with its own handler.

Cons

• Complexity:

  • The pattern can introduce additional complexity to the codebase, particularly as the number of command types and associated command handlers grows.

• Performance:

  • The pattern can introduce additional overhead in the dispatching and execution of commands, particularly in scenarios where a large number of commands are being processed.

• Testing:

  • Testing command handlers can be more challenging, as they are often tightly coupled to the underlying system components they interact with.

• Over-engineering:

  • There may be scenarios where the use of the pattern is not justified, and it can be over-engineering to implement a command dispatcher.