How to determine if a message should be a command message or event message?
Two enterprise integration patterns are the command message and the event message. I am working on a system in which we use messaging not only for integration with other systems, but for internal communication between services. It’s supposed to be an eventually consistent system, and services are supposed to be ignorant of each other (with exception to a couple special-purpose services). As such, we try to avoid things that feel like remote procedure calls (RPC or RPI). We have a bus and message-oriented middleware system, and all messages are broadcasted.
How to determine if a message should be a command message or event message?
Two enterprise integration patterns are the command message and the event message. I am working on a system in which we use messaging not only for integration with other systems, but for internal communication between services. It’s supposed to be an eventually consistent system, and services are supposed to be ignorant of each other (with exception to a couple special-purpose services). As such, we try to avoid things that feel like remote procedure calls (RPC or RPI). We have a bus and message-oriented middleware system, and all messages are broadcasted.
Building a string parser for user command and control?
My goal is to build a command parser that has basic syntax and multiple possible branches at each point. These commands come from users of the system and are text input (no GUI). The basic syntax is base_command [sub_command [optional_parameters]], where optional_parameters is a space seperated list of parameters.
Building a string parser for user command and control?
My goal is to build a command parser that has basic syntax and multiple possible branches at each point. These commands come from users of the system and are text input (no GUI). The basic syntax is base_command [sub_command [optional_parameters]], where optional_parameters is a space seperated list of parameters.
Building a string parser for user command and control?
My goal is to build a command parser that has basic syntax and multiple possible branches at each point. These commands come from users of the system and are text input (no GUI). The basic syntax is base_command [sub_command [optional_parameters]], where optional_parameters is a space seperated list of parameters.
Building a string parser for user command and control?
My goal is to build a command parser that has basic syntax and multiple possible branches at each point. These commands come from users of the system and are text input (no GUI). The basic syntax is base_command [sub_command [optional_parameters]], where optional_parameters is a space seperated list of parameters.
Building a string parser for user command and control?
My goal is to build a command parser that has basic syntax and multiple possible branches at each point. These commands come from users of the system and are text input (no GUI). The basic syntax is base_command [sub_command [optional_parameters]], where optional_parameters is a space seperated list of parameters.
In CQRS/ES, can a command create another command?
In CQRS/ES, a command is sent from the client to the server and routed to the appropriate command handler. That command handler loads an aggregate from its repository, and calls some method on it, and saves it back to the repository. Events are generated. An event handler/saga/process manager can listen to these events in order to issue commands.