io.micronaut.annotation.processing.BeanDefinitionInjectProcessor Maven / Gradle / Ivy
/*
* Copyright 2017-2021 original authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.micronaut.annotation.processing;
import io.micronaut.annotation.processing.visitor.JavaClassElement;
import io.micronaut.annotation.processing.visitor.JavaNativeElement;
import io.micronaut.context.annotation.ConfigurationReader;
import io.micronaut.core.annotation.AnnotationMetadata;
import io.micronaut.core.annotation.AnnotationUtil;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.annotation.Vetoed;
import io.micronaut.core.naming.NameUtils;
import io.micronaut.core.util.CollectionUtils;
import io.micronaut.inject.ast.annotation.ElementAnnotationMetadataFactory;
import io.micronaut.inject.processing.BeanDefinitionCreator;
import io.micronaut.inject.processing.BeanDefinitionCreatorFactory;
import io.micronaut.inject.processing.JavaModelUtils;
import io.micronaut.inject.processing.ProcessingException;
import io.micronaut.inject.visitor.BeanElementVisitor;
import io.micronaut.inject.writer.AbstractBeanDefinitionBuilder;
import io.micronaut.inject.writer.BeanDefinitionVisitor;
import io.micronaut.inject.writer.BeanDefinitionWriter;
import javax.annotation.processing.ProcessingEnvironment;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedOptions;
import javax.lang.model.element.Element;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.Name;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.TypeMirror;
import java.io.IOException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import static javax.lang.model.element.ElementKind.ENUM;
/**
* The core annotation processor used to generate bean definitions and power AOP for Micronaut.
*
* Each dependency injection candidate is visited and {@link BeanDefinitionWriter} is used to produce byte code via ASM.
* Each bean results in a instanceof {@link io.micronaut.inject.BeanDefinition}
*
* @author Graeme Rocher
* @author Dean Wette
* @since 1.0
*/
@Internal
@SupportedOptions({AbstractInjectAnnotationProcessor.MICRONAUT_PROCESSING_INCREMENTAL, AbstractInjectAnnotationProcessor.MICRONAUT_PROCESSING_ANNOTATIONS, BeanDefinitionWriter.OMIT_CONFPROP_INJECTION_POINTS})
public class BeanDefinitionInjectProcessor extends AbstractInjectAnnotationProcessor {
private static final String[] ANNOTATION_STEREOTYPES = new String[]{
AnnotationUtil.POST_CONSTRUCT,
AnnotationUtil.PRE_DESTROY,
"jakarta.annotation.PreDestroy",
"jakarta.annotation.PostConstruct",
"jakarta.inject.Inject",
"jakarta.inject.Qualifier",
"jakarta.inject.Singleton",
"jakarta.inject.Inject",
"jakarta.inject.Qualifier",
"jakarta.inject.Singleton",
"io.micronaut.context.annotation.Bean",
"io.micronaut.context.annotation.Replaces",
"io.micronaut.context.annotation.Value",
"io.micronaut.context.annotation.Property",
"io.micronaut.context.annotation.Executable",
AnnotationUtil.ANN_AROUND,
AnnotationUtil.ANN_INTERCEPTOR_BINDINGS,
AnnotationUtil.ANN_INTERCEPTOR_BINDING,
AnnotationUtil.ANN_INTRODUCTION
};
private Set beanDefinitions;
private final Set processed = new HashSet<>();
private final Map postponed = new HashMap<>();
@Override
public final synchronized void init(ProcessingEnvironment processingEnv) {
super.init(processingEnv);
this.beanDefinitions = new LinkedHashSet<>();
for (BeanElementVisitor visitor : BeanElementVisitor.VISITORS) {
if (visitor.isEnabled()) {
try {
visitor.start(javaVisitorContext);
} catch (Exception e) {
javaVisitorContext.fail("Error initializing bean element visitor [" + visitor.getClass().getName() + "]: " + e.getMessage(), null);
}
}
}
}
@Override
public final boolean process(Set annotations, RoundEnvironment roundEnv) {
boolean processingOver = roundEnv.processingOver();
if (!processingOver) {
JavaAnnotationMetadataBuilder annotationMetadataBuilder = javaVisitorContext.getAnnotationMetadataBuilder();
annotations = annotations
.stream()
.filter(ann -> {
final String name = ann.getQualifiedName().toString();
String packageName = NameUtils.getPackageName(name);
return !name.equals(AnnotationUtil.KOTLIN_METADATA) && !AnnotationUtil.STEREOTYPE_EXCLUDES.contains(packageName);
})
.filter(ann -> annotationMetadataBuilder.lookupOrBuildForType(ann).hasStereotype(ANNOTATION_STEREOTYPES)
|| isProcessedAnnotation(ann.getQualifiedName().toString()))
.collect(Collectors.toSet());
if (!annotations.isEmpty()) {
TypeElement groovyObjectTypeElement = elementUtils.getTypeElement("groovy.lang.GroovyObject");
TypeMirror groovyObjectType = groovyObjectTypeElement != null ? groovyObjectTypeElement.asType() : null;
// accumulate all the class elements for all annotated elements
annotations.forEach(annotation -> modelUtils.resolveTypeElements(
roundEnv.getElementsAnnotatedWith(annotation)
)
.forEach(typeElement -> {
if (typeElement.getKind() == ENUM) {
final AnnotationMetadata am = annotationMetadataBuilder.lookupOrBuildForType(typeElement);
if (BeanDefinitionCreatorFactory.isDeclaredBeanInMetadata(am)) {
error(typeElement, "Enum types cannot be defined as beans");
}
return;
}
// skip Groovy code, handled by InjectTransform. Required for GroovyEclipse compiler
if ((groovyObjectType != null && typeUtils.isAssignable(typeElement.asType(), groovyObjectType))) {
return;
}
String name = typeElement.getQualifiedName().toString();
if (beanDefinitions.contains(name) || processed.contains(name) || name.endsWith(BeanDefinitionVisitor.PROXY_SUFFIX)) {
return;
}
boolean isInterface = JavaModelUtils.resolveKind(typeElement, ElementKind.INTERFACE).isPresent();
if (!isInterface) {
beanDefinitions.add(name);
} else {
AnnotationMetadata annotationMetadata = annotationMetadataBuilder.lookupOrBuildForType(typeElement);
if (BeanDefinitionCreatorFactory.isIntroduction(annotationMetadata) || annotationMetadata.hasStereotype(ConfigurationReader.class)) {
beanDefinitions.add(name);
}
}
}));
}
// remove already processed in previous round
for (String name : processed) {
beanDefinitions.remove(name);
postponed.remove(name);
}
// process remaining
int count = beanDefinitions.size();
if (count > 0) {
note("Creating bean classes for %s type elements", count);
ElementAnnotationMetadataFactory annotationMetadataFactory = javaVisitorContext.getElementAnnotationMetadataFactory().readOnly();
for (String className : beanDefinitions) {
if (processed.add(className)) {
final TypeElement typeElement = elementUtils.getTypeElement(className);
try {
Name classElementQualifiedName = typeElement.getQualifiedName();
if ("java.lang.Record".equals(classElementQualifiedName.toString())) {
continue;
}
JavaClassElement classElement = javaVisitorContext.getElementFactory()
.newClassElement(typeElement, annotationMetadataFactory);
if (classElement.hasAnnotation(Vetoed.class) || classElement.getPackage().hasAnnotation(Vetoed.class)) {
continue;
}
BeanDefinitionCreator beanDefinitionCreator = BeanDefinitionCreatorFactory.produce(classElement, javaVisitorContext);
for (BeanDefinitionVisitor writer : beanDefinitionCreator.build()) {
if (processed.contains(writer.getBeanDefinitionName())) {
throw new IllegalStateException("Already processed: " + writer.getBeanDefinitionName());
} else {
processBeanDefinitions(writer);
processed.add(writer.getBeanDefinitionName());
}
}
} catch (ProcessingException ex) {
error(((JavaNativeElement) ex.getOriginatingElement()).element(), ex.getMessage());
} catch (PostponeToNextRoundException e) {
processed.remove(className);
postponed.put(className, e);
}
}
}
}
}
/*
Since the underlying Filer expects us to write only once into a file we need to make sure it happens in the last
processing round.
*/
if (processingOver) {
for (Map.Entry e : postponed.entrySet()) {
javaVisitorContext.warn("Bean definition generation [" + e.getKey() + "] skipped from processing because of prior error: [" + e.getValue().getPath() + "]." +
" This error is normally due to missing classes on the classpath. Verify the compilation classpath is correct to resolve the problem.", (Element) e.getValue().getErrorElement());
}
try {
writeBeanDefinitionsToMetaInf();
for (BeanElementVisitor visitor : BeanElementVisitor.VISITORS) {
if (visitor.isEnabled()) {
try {
visitor.finish(javaVisitorContext);
} catch (Exception e) {
javaVisitorContext.fail("Error finalizing bean element visitor [" + visitor.getClass().getName() + "]: " + e.getMessage(), null);
}
}
}
final List beanElementBuilders = javaVisitorContext.getBeanElementBuilders();
if (CollectionUtils.isNotEmpty(beanElementBuilders)) {
try {
AbstractBeanDefinitionBuilder.writeBeanDefinitionBuilders(classWriterOutputVisitor, beanElementBuilders);
} catch (IOException e) {
// raise a compile error
String message = e.getMessage();
error("Unexpected error: %s", message != null ? message : e.getClass().getSimpleName());
}
}
} finally {
BeanDefinitionWriter.finish();
}
}
return false;
}
/**
* Writes {@link io.micronaut.inject.BeanDefinitionReference} into /META-INF/services/io
* .micronaut.inject.BeanDefinitionReference.
*/
private void writeBeanDefinitionsToMetaInf() {
try {
classWriterOutputVisitor.finish();
} catch (Exception e) {
String message = e.getMessage();
error("Error occurred writing META-INF files: %s", message != null ? message : e);
}
}
private void processBeanDefinitions(BeanDefinitionVisitor beanDefinitionWriter) {
try {
beanDefinitionWriter.visitBeanDefinitionEnd();
if (beanDefinitionWriter.isEnabled()) {
beanDefinitionWriter.accept(classWriterOutputVisitor);
}
} catch (IOException e) {
// raise a compile error
String message = e.getMessage();
error("Unexpected error: %s", message != null ? message : e.getClass().getSimpleName());
}
}
}
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