Chapter 280. Example: PetStore

Checkout the example in the camel-example-rest-openapi project in the examples directory.

For example if you wanted to use the PetStore provided REST API simply reference the specification URI and desired operation id from the OpenApi specification or download the specification and store it as openapi.json (in the root) of CLASSPATH that way it will be automaticaly used. Let’s use the Undertow component to perform all the requests and Camels excelent support for Spring Boot.

Here are our dependencies defined in Maven POM file:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-undertow-starter</artifactId>
</dependency>

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-rest-openapi-starter</artifactId>
</dependency>

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-undertow-starter</artifactId>
</dependency>

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-rest-openapi-starter</artifactId>
</dependency>

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Start by defining the Undertow component and the RestOpenApiComponent:

@Bean
public Component petstore(CamelContext camelContext, UndertowComponent undertow) {
    RestOpenApiComponent petstore = new RestOpenApiComponent(camelContext);
    petstore.setSpecificationUri("https://petstore3.swagger.io/api/v3/openapi.json");
    petstore.setDelegate(undertow);

    return petstore;
}

@Bean
public Component petstore(CamelContext camelContext, UndertowComponent undertow) {
    RestOpenApiComponent petstore = new RestOpenApiComponent(camelContext);
    petstore.setSpecificationUri("https://petstore3.swagger.io/api/v3/openapi.json");
    petstore.setDelegate(undertow);

    return petstore;
}

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Note

Support in Camel for Spring Boot will auto create the UndertowComponent Spring bean, and you can configure it using application.properties (or application.yml) using prefix camel.component.undertow.. We are defining the petstore component here in order to have a named component in the Camel context that we can use to interact with the PetStore REST API, if this is the only rest-openapi component used we might configure it in the same manner (using application.properties).

Now in our application we can simply use the ProducerTemplate to invoke PetStore REST methods:

@Autowired
ProducerTemplate template;

String getPetJsonById(int petId) {
    return template.requestBodyAndHeaders("petstore:getPetById", null, "petId", petId);
}

@Autowired
ProducerTemplate template;

String getPetJsonById(int petId) {
    return template.requestBodyAndHeaders("petstore:getPetById", null, "petId", petId);
}

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Chapter 280. Example: PetStore

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