Command pattern - How to preserve execution state?
I have the folowing opertaion. I need to create a reservation, during the create of reservation I need to orchestrate several things. The reservation is ordered through a third party system, then an e-mail is sent , then a price offer is finalized and so on...
Can I encapuslate this logic in a single CreateReservationCommand or I need to have three commands and then what pattern would orchestrate the command execution ? Can a command has execution state at all ?
Also I have the feeling that the Command in the sense of gang of four is different than the Command in the sense of CQRS for example. Am I right ?
UPDATE:
What makes me confused here is that in terms of CQRS you can have a commands and events and lets supposed that third party system sends a message to my system CREATE_RESERVATION wouldn't this in the context of CQRS be a command and yet this is more of a complete workflow probably SAGA pattern ?
design-patterns architecture domain-driven-design cqrs command-pattern
asked Nov 21 '18 at 10:42
Alexandar PetrovAlexandar Petrov
5,3101135
add a comment |
I have the folowing opertaion. I need to create a reservation, during the create of reservation I need to orchestrate several things. The reservation is ordered through a third party system, then an e-mail is sent , then a price offer is finalized and so on...
Can I encapuslate this logic in a single CreateReservationCommand or I need to have three commands and then what pattern would orchestrate the command execution ? Can a command has execution state at all ?
Also I have the feeling that the Command in the sense of gang of four is different than the Command in the sense of CQRS for example. Am I right ?
UPDATE:
What makes me confused here is that in terms of CQRS you can have a commands and events and lets supposed that third party system sends a message to my system CREATE_RESERVATION wouldn't this in the context of CQRS be a command and yet this is more of a complete workflow probably SAGA pattern ?
design-patterns architecture domain-driven-design cqrs command-pattern
asked Nov 21 '18 at 10:42
Alexandar PetrovAlexandar Petrov
5,3101135
Command is a transaction - it is either completed or failed. There is no third state. What you are describing looks like saga / process manager to me
– Roman Eremin
Nov 21 '18 at 11:03
You need a Saga. You can read this answer about how to initialize a Saga: softwareengineering.stackexchange.com/questions/381727/…
– Constantin Galbenu
Nov 21 '18 at 13:03
add a comment |
I have the folowing opertaion. I need to create a reservation, during the create of reservation I need to orchestrate several things. The reservation is ordered through a third party system, then an e-mail is sent , then a price offer is finalized and so on...
Can I encapuslate this logic in a single CreateReservationCommand or I need to have three commands and then what pattern would orchestrate the command execution ? Can a command has execution state at all ?
Also I have the feeling that the Command in the sense of gang of four is different than the Command in the sense of CQRS for example. Am I right ?
UPDATE:
What makes me confused here is that in terms of CQRS you can have a commands and events and lets supposed that third party system sends a message to my system CREATE_RESERVATION wouldn't this in the context of CQRS be a command and yet this is more of a complete workflow probably SAGA pattern ?
design-patterns architecture domain-driven-design cqrs command-pattern
asked Nov 21 '18 at 10:42
Alexandar PetrovAlexandar Petrov
5,3101135
I have the folowing opertaion. I need to create a reservation, during the create of reservation I need to orchestrate several things. The reservation is ordered through a third party system, then an e-mail is sent , then a price offer is finalized and so on...
Can I encapuslate this logic in a single CreateReservationCommand or I need to have three commands and then what pattern would orchestrate the command execution ? Can a command has execution state at all ?
Also I have the feeling that the Command in the sense of gang of four is different than the Command in the sense of CQRS for example. Am I right ?
UPDATE:
What makes me confused here is that in terms of CQRS you can have a commands and events and lets supposed that third party system sends a message to my system CREATE_RESERVATION wouldn't this in the context of CQRS be a command and yet this is more of a complete workflow probably SAGA pattern ?
design-patterns architecture domain-driven-design cqrs command-pattern
design-patterns architecture domain-driven-design cqrs command-pattern
asked Nov 21 '18 at 10:42
Alexandar PetrovAlexandar Petrov
5,3101135
asked Nov 21 '18 at 10:42
Alexandar PetrovAlexandar Petrov
5,3101135
edited Nov 29 '18 at 11:57
Alexandar Petrov
asked Nov 21 '18 at 10:42
Alexandar PetrovAlexandar Petrov
5,3101135
asked Nov 21 '18 at 10:42
Alexandar PetrovAlexandar Petrov
5,3101135
asked Nov 21 '18 at 10:42
Alexandar PetrovAlexandar Petrov
5,3101135
5,3101135
Command is a transaction - it is either completed or failed. There is no third state. What you are describing looks like saga / process manager to me
– Roman Eremin
Nov 21 '18 at 11:03
You need a Saga. You can read this answer about how to initialize a Saga: softwareengineering.stackexchange.com/questions/381727/…
– Constantin Galbenu
Nov 21 '18 at 13:03
add a comment |
Command is a transaction - it is either completed or failed. There is no third state. What you are describing looks like saga / process manager to me
– Roman Eremin
Nov 21 '18 at 11:03
You need a Saga. You can read this answer about how to initialize a Saga: softwareengineering.stackexchange.com/questions/381727/…
– Constantin Galbenu
Nov 21 '18 at 13:03
Command is a transaction - it is either completed or failed. There is no third state. What you are describing looks like saga / process manager to me
– Roman Eremin
Nov 21 '18 at 11:03
Command is a transaction - it is either completed or failed. There is no third state. What you are describing looks like saga / process manager to me
– Roman Eremin
Nov 21 '18 at 11:03
You need a Saga. You can read this answer about how to initialize a Saga: softwareengineering.stackexchange.com/questions/381727/…
– Constantin Galbenu
Nov 21 '18 at 13:03
You need a Saga. You can read this answer about how to initialize a Saga: softwareengineering.stackexchange.com/questions/381727/…
– Constantin Galbenu
Nov 21 '18 at 13:03
add a comment |
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Can I encapuslate this logic in a single CreateReservationCommand or I need to have three commands and then what pattern would orchestrate the command execution ? Can a command has execution state at all ?
You can... but usually the book keeping of orchestration uses something like the process manager pattern, which would span multiple transactions.
I have the feeling that the Command in the sense of gang of four is different than the Command in the sense of CQRS for example. Am I right ?
You are absolutely correct -- completely different ideas. "Command in CQRS" is a descendant of Gregor Hohpe's Command Message pattern.
answered Nov 21 '18 at 12:40
VoiceOfUnreasonVoiceOfUnreason
19.7k21847
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1 Answer
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Can I encapuslate this logic in a single CreateReservationCommand or I need to have three commands and then what pattern would orchestrate the command execution ? Can a command has execution state at all ?
You can... but usually the book keeping of orchestration uses something like the process manager pattern, which would span multiple transactions.
I have the feeling that the Command in the sense of gang of four is different than the Command in the sense of CQRS for example. Am I right ?
You are absolutely correct -- completely different ideas. "Command in CQRS" is a descendant of Gregor Hohpe's Command Message pattern.
answered Nov 21 '18 at 12:40
VoiceOfUnreasonVoiceOfUnreason
19.7k21847
add a comment |
Can I encapuslate this logic in a single CreateReservationCommand or I need to have three commands and then what pattern would orchestrate the command execution ? Can a command has execution state at all ?
You can... but usually the book keeping of orchestration uses something like the process manager pattern, which would span multiple transactions.
I have the feeling that the Command in the sense of gang of four is different than the Command in the sense of CQRS for example. Am I right ?
You are absolutely correct -- completely different ideas. "Command in CQRS" is a descendant of Gregor Hohpe's Command Message pattern.
answered Nov 21 '18 at 12:40
VoiceOfUnreasonVoiceOfUnreason
19.7k21847
add a comment |
Can I encapuslate this logic in a single CreateReservationCommand or I need to have three commands and then what pattern would orchestrate the command execution ? Can a command has execution state at all ?
You can... but usually the book keeping of orchestration uses something like the process manager pattern, which would span multiple transactions.
I have the feeling that the Command in the sense of gang of four is different than the Command in the sense of CQRS for example. Am I right ?
You are absolutely correct -- completely different ideas. "Command in CQRS" is a descendant of Gregor Hohpe's Command Message pattern.
answered Nov 21 '18 at 12:40
VoiceOfUnreasonVoiceOfUnreason
19.7k21847
Can I encapuslate this logic in a single CreateReservationCommand or I need to have three commands and then what pattern would orchestrate the command execution ? Can a command has execution state at all ?
You can... but usually the book keeping of orchestration uses something like the process manager pattern, which would span multiple transactions.
I have the feeling that the Command in the sense of gang of four is different than the Command in the sense of CQRS for example. Am I right ?
You are absolutely correct -- completely different ideas. "Command in CQRS" is a descendant of Gregor Hohpe's Command Message pattern.
answered Nov 21 '18 at 12:40
VoiceOfUnreasonVoiceOfUnreason
19.7k21847
answered Nov 21 '18 at 12:40
VoiceOfUnreasonVoiceOfUnreason
19.7k21847
answered Nov 21 '18 at 12:40
VoiceOfUnreasonVoiceOfUnreason
19.7k21847
answered Nov 21 '18 at 12:40
VoiceOfUnreasonVoiceOfUnreason
19.7k21847
19.7k21847
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add a comment |
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Command is a transaction - it is either completed or failed. There is no third state. What you are describing looks like saga / process manager to me
– Roman Eremin
Nov 21 '18 at 11:03
You need a Saga. You can read this answer about how to initialize a Saga: softwareengineering.stackexchange.com/questions/381727/…
– Constantin Galbenu
Nov 21 '18 at 13:03