Getting started guide for smallrye-reactive-messaging-kafka #17830
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cescoffier
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With Dev Services, I'm wondering if we should not split the app in two different processes. That would be way more realistic. |
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| == Architecture | ||
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| In this guide, we are going to develop two microservices for an application that will ask for some price and receive quotes from providers in real-time. |
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| In this guide, we are going to develop two microservices for an application that will ask for some price and receive quotes from providers in real-time. | |
| In this guide, we are going to develop two applications communicating with Kafka. | |
| The first application sends a _quote request_ to Kafka and consumes Kafka messages from the _quote_ topic. | |
| The second application receives the _quote request_ and sends a _quote_ back. |
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| In this guide, we are going to develop two microservices for an application that will ask for some price and receive quotes from providers in real-time. | ||
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| The first component, the `producer`, will let the user request some quotes over a JAX-RS endpoint. |
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| The first component, the `producer`, will let the user request some quotes over a JAX-RS endpoint. | |
| The first component, the `producer`, will let the user request some quotes over an HTTP endpoint. |
| For each quote request a random identifier is generated and returned to the user, to put the quote request on _pending_. | ||
| At the same time the generated request id is sent over a Kafka topic `quote-requests`. | ||
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| The second component, the `processor`, in turn will read from the `quote-requests` topic put a magic random price to the quote and send it to a Kafka topic named `quotes`. |
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| The second component, the `processor`, in turn will read from the `quote-requests` topic put a magic random price to the quote and send it to a Kafka topic named `quotes`. | |
| The second component, the `processor`, in turn, will read from the `quote-requests` topic put a random price to the quote, and send it to a Kafka topic named `quotes`. |
| import io.smallrye.mutiny.Multi; | ||
| [...] | ||
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| @Inject |
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| Nothing spectacular here. | ||
| On each received price, it updates the page. |
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| On each received price, it updates the page. | |
| On each received quote, it updates the page. |
| Quarkus starts a Kafka broker automatically, configures the application and shares the Kafka broker instance between different applications. | ||
| See xref:kafka-dev-services.adoc[Dev Services for Kafka] for more details. | ||
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| Open `http://localhost:8080/quotes.html` in your browser. |
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| Open `http://localhost:8080/quotes.html` in your browser. | |
| Open `http://localhost:8080/quotes.html` in your browser and click the button to request quotes. |
| This guide has shown how you can interact with Kafka using Quarkus. | ||
| It utilizes SmallRye Reactive Messaging to build data streaming applications. | ||
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| If you want to go further check the documentation of https://smallrye.io/smallrye-reactive-messaging[SmallRye Reactive Messaging], the implementation used in Quarkus. |
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| If you want to go further check the documentation of https://smallrye.io/smallrye-reactive-messaging[SmallRye Reactive Messaging], the implementation used in Quarkus. | |
| If you want to go further check the documentation of https://smallrye.io/smallrye-reactive-messaging[SmallRye Reactive Messaging]. |
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cescoffier
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The kafka.adoc will be renamed to Kafka reference guide