Chapter 4. Getting Started with Red Hat build of Apache Camel for Quarkus

Procedure

1. In the code.quarkus.redhat.com website, select the following extensions:

   • camel-quarkus-rest
   • camel-quarkus-jackson

   • camel-quarkus-direct

     Note

     Do not compile the application on code.quarkus.redhat.com (in the final step of the procedure). Instead, use the compile command described in the Section 4.2.5, “Development mode” section below.

2. Navigate to the directory where you extracted the generated project files from the previous step:

   $ cd <directory_name>

Procedure

1. Create a file named Fruit.java in the src/main/java/org/acme/ subfolder.

2. Add the class as shown in the following code snippet:

   Fruit.java

   package org.acme.rest.json;
   
   import java.util.Objects;
   
   import io.quarkus.runtime.annotations.RegisterForReflection;
   
   /**
    * A REST entity representing a fruit.
    */
   @RegisterForReflection // Lets Quarkus register this class for reflection during the native build
   public class Fruit {
       private String name;
       private String description;
   
       public Fruit() {
       }
   
       public Fruit(String name, String description) {
           this.name = name;
           this.description = description;
       }
   
       public String getName() {
           return name;
       }
   
       public void setName(String name) {
           this.name = name;
       }
   
       public String getDescription() {
           return description;
       }
   
       public void setDescription(String description) {
           this.description = description;
       }
   
       @Override
       public boolean equals(Object obj) {
           if (!(obj instanceof Fruit)) {
               return false;
           }
   
           Fruit other = (Fruit) obj;
   
           return Objects.equals(other.name, this.name);
       }
   
       @Override
       public int hashCode() {
           return Objects.hash(this.name);
       }
   }

3. Create a file named Legume.java in the src/main/java/org/acme/ subfolder.

4. Add the class as shown in the following code snippet:

   Legume.java

   package org.acme.rest.json;
   
   import java.util.Objects;
   
   import io.quarkus.runtime.annotations.RegisterForReflection;
   
   /**
    * A REST entity representing a legume.
    */
   @RegisterForReflection // Lets Quarkus register this class for reflection during the native build
   public class Legume {
       private String name;
       private String description;
   
       public Legume() {
       }
   
       public Legume(String name, String description) {
           this.name = name;
           this.description = description;
       }
   
       public String getName() {
           return name;
       }
   
       public void setName(String name) {
           this.name = name;
       }
   
       public String getDescription() {
           return description;
       }
   
       public void setDescription(String description) {
           this.description = description;
       }
   
       @Override
       public boolean equals(Object obj) {
           if (!(obj instanceof Legume)) {
               return false;
           }
   
           Legume other = (Legume) obj;
   
           return Objects.equals(other.name, this.name);
       }
   
       @Override
       public int hashCode() {
           return Objects.hash(this.name);
       }
   }

5. Create a file named Routes.java in the src/main/java/org/acme/ subfolder.

6. Add a Camel Rest route as shown in the following code snippet:

   Routes.java

   package org.acme.rest.json;
   
   import java.util.Collections;
   import java.util.LinkedHashSet;
   import java.util.Set;
   
   import org.apache.camel.builder.RouteBuilder;
   import org.apache.camel.model.rest.RestBindingMode;
   
   /**
    * Camel route definitions.
    */
   public class Routes extends RouteBuilder {
       private final Set<Fruit> fruits = Collections.synchronizedSet(new LinkedHashSet<>());
       private final Set<Legume> legumes = Collections.synchronizedSet(new LinkedHashSet<>());
   
       public Routes() {
   
           /* Let's add some initial fruits */
           this.fruits.add(new Fruit("Apple", "Winter fruit"));
           this.fruits.add(new Fruit("Pineapple", "Tropical fruit"));
   
           /* Let's add some initial legumes */
           this.legumes.add(new Legume("Carrot", "Root vegetable, usually orange"));
           this.legumes.add(new Legume("Zucchini", "Summer squash"));
       }
   
       @Override
       public void configure() throws Exception {
   
           restConfiguration().bindingMode(RestBindingMode.json);
   
           rest("/fruits")
                   .get()
                   .to("direct:getFruits")
   
                   .post()
                   .type(Fruit.class)
                   .to("direct:addFruit");
   
           rest("/legumes")
                   .get()
                   .to("direct:getLegumes");
   
           from("direct:getFruits")
                   .setBody().constant(fruits);
   
           from("direct:addFruit")
                   .process().body(Fruit.class, fruits::add)
                   .setBody().constant(fruits);
   
           from("direct:getLegumes")
                   .setBody().constant(legumes);
       }
   }

   For more information about this example, see camel-quarkus-examples repository.