Axon Reference Guide
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4.5
Introduction
Architecture Overview
Axon Server
Release Notes
Getting Started
Quick Start
Axon Framework
Introduction
Messaging Concepts
Commands
Events
Queries
Query Processing
Query Dispatchers
Query Handlers
Implementations
Configuration
Sagas
Deadlines
Testing
Tuning
Monitoring and Metrics
Spring Boot Integration
Modules
Axon Server
Introduction
Installation
Administration
Security
Performance
Migration
Extensions
Spring AMQP
JGroups
Kafka
Kotlin
Mongo
Reactor
Spring Cloud
Tracing
Appendices
A. RDBMS Tuning
B. Message Handler Tuning
C. Meta Annotations
D. Identifier Generation
E. Axon Server Query Language
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Query Processing
Processing queries as a dedicated type of message is in line with separating the query models when following CQRS. Although creating a query handling layer is fairly straight-forward, using Axon Framework for this part of the application has a number of benefits.
Through providing the functionality to describe query handling methods (as further explained in this section) and a dedicated bus for query messages, common message features such as interceptors and message monitoring can be used.
The next sections provide an overview of the tasks related to configuring the necessary components to start processing queries in an Axon application. To that end the approach to registering @QueryHandler annotated methods is discussed, as well as what options are present when it comes to dispatching queries.
Query Types
Axon Framework makes a distinction between three types of queries, namely (1) Point-to-Point queries, (2) Scatter-Gather queries, and (3) Subscription queries.
Click the links for specifics on how to implement each type of query.
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