RESTEasy Reactive Links

bom/application/pom.xml

@@ -1942,6 +1942,16 @@
                 <artifactId>quarkus-resteasy-reactive-jackson-deployment</artifactId>
                 <version>${project.version}</version>
             </dependency>
+            <dependency>
+                <groupId>io.quarkus</groupId>
+                <artifactId>quarkus-resteasy-reactive-links</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>io.quarkus</groupId>
+                <artifactId>quarkus-resteasy-reactive-links-deployment</artifactId>
+                <version>${project.version}</version>
+            </dependency>
             <dependency>
                 <groupId>io.quarkus</groupId>
                 <artifactId>quarkus-reactive-datasource</artifactId>

core/deployment/src/main/java/io/quarkus/deployment/Feature.java

@@ -92,6 +92,7 @@ public enum Feature {
     RESTEASY_REACTIVE_JAXRS_CLIENT,
     RESTEASY_REACTIVE_JSONB,
     RESTEASY_REACTIVE_JACKSON,
+    RESTEASY_REACTIVE_LINKS,
     REST_CLIENT,
     REST_CLIENT_JACKSON,
     REST_CLIENT_JAXB,

devtools/bom-descriptor-json/pom.xml

@@ -2496,4 +2496,4 @@
         </profile>
     </profiles>
 
-</project>
+</project>

docs/pom.xml

@@ -1904,6 +1904,19 @@
                 </exclusion>
             </exclusions>
         </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-resteasy-reactive-links-deployment</artifactId>
+            <version>${project.version}</version>
+            <type>pom</type>
+            <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>*</groupId>
+                    <artifactId>*</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
         <dependency>
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-resteasy-reactive-qute-deployment</artifactId>

extensions/resteasy-reactive/pom.xml

@@ -22,6 +22,7 @@
         <module>quarkus-resteasy-reactive-jsonb</module>
         <module>quarkus-resteasy-reactive-qute</module>
         <module>quarkus-resteasy-reactive-servlet</module>
+        <module>quarkus-resteasy-reactive-links</module>
     </modules>
 
 </project>

extensions/resteasy-reactive/quarkus-resteasy-reactive-links/deployment/pom.xml

@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>quarkus-resteasy-reactive-links-parent</artifactId>
+        <groupId>io.quarkus</groupId>
+        <version>999-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>quarkus-resteasy-reactive-links-deployment</artifactId>
+    <name>Quarkus - RESTEasy Reactive - Links - Deployment</name>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-resteasy-reactive-links</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-resteasy-reactive-deployment</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-junit5-internal</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.rest-assured</groupId>
+            <artifactId>rest-assured</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>io.quarkus</groupId>
+                            <artifactId>quarkus-extension-processor</artifactId>
+                            <version>${project.version}</version>
+                        </path>
+                    </annotationProcessorPaths>
+                    <parameters>true</parameters>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

extensions/resteasy-reactive/quarkus-resteasy-reactive-links/deployment/src/main/java/io/quarkus/resteasy/reactive/links/deployment/GetterAccessorImplementor.java

@@ -0,0 +1,29 @@
+package io.quarkus.resteasy.reactive.links.deployment;
+
+import static io.quarkus.gizmo.MethodDescriptor.ofMethod;
+
+import io.quarkus.gizmo.ClassCreator;
+import io.quarkus.gizmo.ClassOutput;
+import io.quarkus.gizmo.MethodCreator;
+import io.quarkus.gizmo.ResultHandle;
+import io.quarkus.resteasy.reactive.links.runtime.GetterAccessor;
+
+class GetterAccessorImplementor {
+
+    /**
+     * Implements a {@link GetterAccessor} that knows how to access a specific getter method of a specific type.
+     */
+    void implement(ClassOutput classOutput, GetterMetadata getterMetadata) {
+        ClassCreator classCreator = ClassCreator.builder()
+                .classOutput(classOutput).className(getterMetadata.getGetterAccessorName())
+                .interfaces(GetterAccessor.class)
+                .build();
+        MethodCreator methodCreator = classCreator.getMethodCreator("get", Object.class, Object.class);
+        ResultHandle value = methodCreator.invokeVirtualMethod(
+                ofMethod(getterMetadata.getEntityType(), getterMetadata.getGetterName(), getterMetadata.getFieldType()),
+                methodCreator.getMethodParam(0));
+        methodCreator.returnValue(value);
+        methodCreator.close();
+        classCreator.close();
+    }
+}

extensions/resteasy-reactive/quarkus-resteasy-reactive-links/deployment/src/main/java/io/quarkus/resteasy/reactive/links/deployment/GetterImplementor.java

@@ -0,0 +1,54 @@
+package io.quarkus.resteasy.reactive.links.deployment;
+
+import static io.quarkus.gizmo.DescriptorUtils.objectToDescriptor;
+import static org.objectweb.asm.Opcodes.ACC_PUBLIC;
+import static org.objectweb.asm.Opcodes.ALOAD;
+import static org.objectweb.asm.Opcodes.GETFIELD;
+import static org.objectweb.asm.Opcodes.IRETURN;
+
+import java.util.function.BiFunction;
+
+import org.objectweb.asm.ClassVisitor;
+import org.objectweb.asm.MethodVisitor;
+import org.objectweb.asm.Type;
+
+import io.quarkus.gizmo.Gizmo;
+
+class GetterImplementor extends ClassVisitor {
+
+    private final GetterMetadata getterMetadata;
+
+    static BiFunction<String, ClassVisitor, ClassVisitor> getVisitorFunction(GetterMetadata getterMetadata) {
+        return (className, classVisitor) -> new GetterImplementor(classVisitor, getterMetadata);
+    }
+
+    GetterImplementor(ClassVisitor outputClassVisitor, GetterMetadata getterMetadata) {
+        super(Gizmo.ASM_API_VERSION, outputClassVisitor);
+        this.getterMetadata = getterMetadata;
+    }
+
+    @Override
+    public MethodVisitor visitMethod(int access, String name, String descriptor, String signature,
+            String[] exceptions) {
+        return super.visitMethod(access, name, descriptor, signature, exceptions);
+    }
+
+    @Override
+    public void visitEnd() {
+        generateGetter();
+        super.visitEnd();
+    }
+
+    private void generateGetter() {
+        String owner = Type.getType(objectToDescriptor(getterMetadata.getEntityType())).getInternalName();
+        String fieldDescriptor = objectToDescriptor(getterMetadata.getFieldType());
+        String getterDescriptor = "()" + fieldDescriptor;
+
+        MethodVisitor mv = super.visitMethod(ACC_PUBLIC, getterMetadata.getGetterName(), getterDescriptor, null, null);
+        mv.visitVarInsn(ALOAD, 0);
+        mv.visitFieldInsn(GETFIELD, owner, getterMetadata.getFieldName(), fieldDescriptor);
+        mv.visitInsn(Type.getType(fieldDescriptor).getOpcode(IRETURN));
+        mv.visitMaxs(0, 0);
+        mv.visitEnd();
+    }
+}

extensions/resteasy-reactive/quarkus-resteasy-reactive-links/deployment/src/main/java/io/quarkus/resteasy/reactive/links/deployment/GetterMetadata.java

@@ -0,0 +1,63 @@
+package io.quarkus.resteasy.reactive.links.deployment;
+
+import java.util.Objects;
+
+import org.jboss.jandex.FieldInfo;
+
+class GetterMetadata {
+
+    private static final String GETTER_PREFIX = "resteasy_links_get_";
+
+    private static final String ACCESSOR_SUFFIX = "$_resteasy_links";
+
+    private final String entityType;
+
+    private final String fieldType;
+
+    private final String fieldName;
+
+    GetterMetadata(FieldInfo fieldInfo) {
+        this.entityType = fieldInfo.declaringClass().toString();
+        this.fieldType = fieldInfo.type().name().toString();
+        this.fieldName = fieldInfo.name();
+    }
+
+    public String getEntityType() {
+        return entityType;
+    }
+
+    public String getFieldType() {
+        return fieldType;
+    }
+
+    public String getFieldName() {
+        return fieldName;
+    }
+
+    public String getGetterName() {
+        return GETTER_PREFIX + fieldName;
+    }
+
+    public String getGetterAccessorName() {
+        return entityType + ACCESSOR_SUFFIX + getGetterName();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        GetterMetadata that = (GetterMetadata) o;
+        return entityType.equals(that.entityType)
+                && fieldType.equals(that.fieldType)
+                && fieldName.equals(that.fieldName);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(entityType, fieldType, fieldName);
+    }
+}