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Concept Map » CQRS And Event Sourcing changes

CQRS and Event Sourcing represent an approach to building business systems that draws heavily on Domain Driven Design while avoiding tedious Object Relational Mapping and many other difficulties with common application development approaches.

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Concepts

Aggregate

This concept has no description.
  1. Aggregate has Behaviour
  2. Aggregate has State
  3. Aggregate processes Command
  4. Aggregate rehydrates using Event Sourcing
  5. Aggregate rejects Command
  6. Command Handler instantiates Aggregate
  7. Domain Model is composed of Aggregate

Application Service

This concept has no description.
  1. Command Handler is a Application Service
  2. Query Handler is a Application Service

Behaviour

This concept has no description.
  1. Aggregate has Behaviour
  2. Behaviour publishes Event
  3. Command triggers Behaviour

CQRS

This concept has no description.
  1. CQRS is composed of Read Side
  2. CQRS is composed of Write Side

Command

A command is a serialised method call that capture the intent of the user. It is always expressed in the imperative, e.g. "Make Payment", "Ship Goods", etc.

It is important to note that commands can be rejected by the application based on any number of validations, including permissions, concurrency issues, data validation, etc.

  1. Aggregate processes Command
  2. Aggregate rejects Command
  3. Command changes State
  4. Command triggers Behaviour
  5. Command Handler receives Command

Command Handler

This concept has no description.
  1. Command Handler instantiates Aggregate
  2. Command Handler is a Application Service
  3. Command Handler receives Command
  4. Write Side is composed of Command Handler

Domain Model

This concept has no description.
  1. Domain Model is composed of Aggregate
  2. Write Side is composed of Domain Model

Event

This concept has no description.
  1. Behaviour publishes Event
  2. Event Sourcing reads Event

Event Sourcing

This concept has no description.
  1. Aggregate rehydrates using Event Sourcing
  2. Event Sourcing reads Event
  3. Event Sourcing recreates State

Query Handler

This concept has no description.
  1. Query Handler is a Application Service
  2. Read Side is composed of Query Handler

Read Side

This concept has no description.
  1. CQRS is composed of Read Side
  2. Read Side is composed of Query Handler
  3. Read Side is composed of View Model

State

This concept has no description.
  1. Aggregate has State
  2. Command changes State
  3. Event Sourcing recreates State

View Model

This concept has no description.
  1. Read Side is composed of View Model

Write Side

This concept has no description.
  1. CQRS is composed of Write Side
  2. Write Side is composed of Command Handler
  3. Write Side is composed of Domain Model

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Collaborators

This concept map is owned by jimmyjazz68

Other users collaborating on this concept map:

  1. haruki_zaemon
  2. notahat
  3. taoza
  4. vonconrad