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org.springframework.boot.autoconfigure.condition.OnBeanCondition Maven / Gradle / Ivy
/*
* Copyright 2012-2015 the original author or 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
*
* http://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 org.springframework.boot.autoconfigure.condition;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.HierarchicalBeanFactory;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.context.annotation.ConfigurationCondition;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.core.type.AnnotatedTypeMetadata;
import org.springframework.core.type.MethodMetadata;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.MultiValueMap;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.ReflectionUtils.MethodCallback;
import org.springframework.util.StringUtils;
/**
* {@link Condition} that checks for the presence or absence of specific beans.
*
* @author Phillip Webb
* @author Dave Syer
* @author Jakub Kubrynski
* @author Stephane Nicoll
* @author Andy Wilkinson
*/
@Order(Ordered.LOWEST_PRECEDENCE)
class OnBeanCondition extends SpringBootCondition implements ConfigurationCondition {
private static final String[] NO_BEANS = {};
/**
* Bean definition attribute name for factory beans to signal their product type (if
* known and it can't be deduced from the factory bean class).
*/
public static final String FACTORY_BEAN_OBJECT_TYPE = BeanTypeRegistry.FACTORY_BEAN_OBJECT_TYPE;
@Override
public ConfigurationPhase getConfigurationPhase() {
return ConfigurationPhase.REGISTER_BEAN;
}
@Override
public ConditionOutcome getMatchOutcome(ConditionContext context,
AnnotatedTypeMetadata metadata) {
StringBuilder matchMessage = new StringBuilder();
if (metadata.isAnnotated(ConditionalOnBean.class.getName())) {
BeanSearchSpec spec = new BeanSearchSpec(context, metadata,
ConditionalOnBean.class);
List matching = getMatchingBeans(context, spec);
if (matching.isEmpty()) {
return ConditionOutcome
.noMatch("@ConditionalOnBean " + spec + " found no beans");
}
matchMessage.append("@ConditionalOnBean ").append(spec)
.append(" found the following ").append(matching);
}
if (metadata.isAnnotated(ConditionalOnSingleCandidate.class.getName())) {
BeanSearchSpec spec = new SingleCandidateBeanSearchSpec(context, metadata,
ConditionalOnSingleCandidate.class);
List matching = getMatchingBeans(context, spec);
if (matching.isEmpty()) {
return ConditionOutcome.noMatch(
"@ConditionalOnSingleCandidate " + spec + " found no beans");
}
else if (!hasSingleAutowireCandidate(context.getBeanFactory(), matching)) {
return ConditionOutcome.noMatch("@ConditionalOnSingleCandidate " + spec
+ " found no primary candidate amongst the" + " following "
+ matching);
}
matchMessage.append("@ConditionalOnSingleCandidate ").append(spec)
.append(" found a primary candidate amongst the following ")
.append(matching);
}
if (metadata.isAnnotated(ConditionalOnMissingBean.class.getName())) {
BeanSearchSpec spec = new BeanSearchSpec(context, metadata,
ConditionalOnMissingBean.class);
List matching = getMatchingBeans(context, spec);
if (!matching.isEmpty()) {
return ConditionOutcome.noMatch("@ConditionalOnMissingBean " + spec
+ " found the following " + matching);
}
matchMessage.append(matchMessage.length() == 0 ? "" : " ");
matchMessage.append("@ConditionalOnMissingBean ").append(spec)
.append(" found no beans");
}
return ConditionOutcome.match(matchMessage.toString());
}
private List getMatchingBeans(ConditionContext context,
BeanSearchSpec beans) {
ConfigurableListableBeanFactory beanFactory = context.getBeanFactory();
if (beans.getStrategy() == SearchStrategy.PARENTS) {
BeanFactory parent = beanFactory.getParentBeanFactory();
Assert.isInstanceOf(ConfigurableListableBeanFactory.class, parent,
"Unable to use SearchStrategy.PARENTS");
beanFactory = (ConfigurableListableBeanFactory) parent;
}
if (beanFactory == null) {
return Collections.emptyList();
}
List beanNames = new ArrayList();
boolean considerHierarchy = beans.getStrategy() == SearchStrategy.ALL;
for (String type : beans.getTypes()) {
beanNames.addAll(getBeanNamesForType(beanFactory, type,
context.getClassLoader(), considerHierarchy));
}
for (String ignoredType : beans.getIgnoredTypes()) {
beanNames.removeAll(getBeanNamesForType(beanFactory, ignoredType,
context.getClassLoader(), considerHierarchy));
}
for (String annotation : beans.getAnnotations()) {
beanNames.addAll(Arrays.asList(getBeanNamesForAnnotation(beanFactory,
annotation, context.getClassLoader(), considerHierarchy)));
}
for (String beanName : beans.getNames()) {
if (containsBean(beanFactory, beanName, considerHierarchy)) {
beanNames.add(beanName);
}
}
return beanNames;
}
private boolean containsBean(ConfigurableListableBeanFactory beanFactory,
String beanName, boolean considerHierarchy) {
if (considerHierarchy) {
return beanFactory.containsBean(beanName);
}
return beanFactory.containsLocalBean(beanName);
}
private Collection getBeanNamesForType(ListableBeanFactory beanFactory,
String type, ClassLoader classLoader, boolean considerHierarchy)
throws LinkageError {
try {
Set result = new LinkedHashSet();
collectBeanNamesForType(result, beanFactory,
ClassUtils.forName(type, classLoader), considerHierarchy);
return result;
}
catch (ClassNotFoundException ex) {
return Collections.emptySet();
}
}
private void collectBeanNamesForType(Set result,
ListableBeanFactory beanFactory, Class type, boolean considerHierarchy) {
result.addAll(BeanTypeRegistry.get(beanFactory).getNamesForType(type));
if (considerHierarchy && beanFactory instanceof HierarchicalBeanFactory) {
BeanFactory parent = ((HierarchicalBeanFactory) beanFactory)
.getParentBeanFactory();
if (parent instanceof ListableBeanFactory) {
collectBeanNamesForType(result, (ListableBeanFactory) parent, type,
considerHierarchy);
}
}
}
private String[] getBeanNamesForAnnotation(
ConfigurableListableBeanFactory beanFactory, String type,
ClassLoader classLoader, boolean considerHierarchy) throws LinkageError {
String[] result = NO_BEANS;
try {
@SuppressWarnings("unchecked")
Class typeClass = (Class) ClassUtils
.forName(type, classLoader);
result = beanFactory.getBeanNamesForAnnotation(typeClass);
if (considerHierarchy) {
if (beanFactory
.getParentBeanFactory() instanceof ConfigurableListableBeanFactory) {
String[] parentResult = getBeanNamesForAnnotation(
(ConfigurableListableBeanFactory) beanFactory
.getParentBeanFactory(),
type, classLoader, true);
List resultList = new ArrayList();
resultList.addAll(Arrays.asList(result));
for (String beanName : parentResult) {
if (!resultList.contains(beanName)
&& !beanFactory.containsLocalBean(beanName)) {
resultList.add(beanName);
}
}
result = StringUtils.toStringArray(resultList);
}
}
return result;
}
catch (ClassNotFoundException ex) {
return NO_BEANS;
}
}
private boolean hasSingleAutowireCandidate(
ConfigurableListableBeanFactory beanFactory, List beanNames) {
return (beanNames.size() == 1
|| getPrimaryBeans(beanFactory, beanNames).size() == 1);
}
private List getPrimaryBeans(ConfigurableListableBeanFactory beanFactory,
List beanNames) {
List primaryBeans = new ArrayList();
for (String beanName : beanNames) {
BeanDefinition beanDefinition = beanFactory.getBeanDefinition(beanName);
if (beanDefinition != null && beanDefinition.isPrimary()) {
primaryBeans.add(beanName);
}
}
return primaryBeans;
}
private static class BeanSearchSpec {
private final Class annotationType;
private final List names = new ArrayList();
private final List types = new ArrayList();
private final List annotations = new ArrayList();
private final List ignoredTypes = new ArrayList();
private final SearchStrategy strategy;
BeanSearchSpec(ConditionContext context, AnnotatedTypeMetadata metadata,
Class annotationType) {
this.annotationType = annotationType;
MultiValueMap attributes = metadata
.getAllAnnotationAttributes(annotationType.getName(), true);
collect(attributes, "name", this.names);
collect(attributes, "value", this.types);
collect(attributes, "type", this.types);
collect(attributes, "annotation", this.annotations);
collect(attributes, "ignored", this.ignoredTypes);
collect(attributes, "ignoredType", this.ignoredTypes);
this.strategy = (SearchStrategy) metadata
.getAnnotationAttributes(annotationType.getName()).get("search");
BeanTypeDeductionException deductionException = null;
try {
if (this.types.isEmpty() && this.names.isEmpty()) {
addDeducedBeanType(context, metadata, this.types);
}
}
catch (BeanTypeDeductionException ex) {
deductionException = ex;
}
validate(deductionException);
}
protected void validate(BeanTypeDeductionException ex) {
if (!hasAtLeastOne(this.types, this.names, this.annotations)) {
String message = annotationName()
+ " did not specify a bean using type, name or annotation";
if (ex == null) {
throw new IllegalStateException(message);
}
throw new IllegalStateException(message + " and the attempt to deduce"
+ " the bean's type failed", ex);
}
}
private boolean hasAtLeastOne(List... lists) {
for (List list : lists) {
if (!list.isEmpty()) {
return true;
}
}
return false;
}
protected String annotationName() {
return "@" + ClassUtils.getShortName(this.annotationType);
}
protected void collect(MultiValueMap attributes, String key,
List destination) {
List values = attributes.get(key);
if (values != null) {
for (Object value : values) {
if (value instanceof String[]) {
Collections.addAll(destination, (String[]) value);
}
else {
destination.add((String) value);
}
}
}
}
private void addDeducedBeanType(ConditionContext context,
AnnotatedTypeMetadata metadata, final List beanTypes) {
if (metadata instanceof MethodMetadata
&& metadata.isAnnotated(Bean.class.getName())) {
addDeducedBeanTypeForBeanMethod(context, metadata, beanTypes,
(MethodMetadata) metadata);
}
}
private void addDeducedBeanTypeForBeanMethod(ConditionContext context,
AnnotatedTypeMetadata metadata, final List beanTypes,
final MethodMetadata methodMetadata) {
try {
// We should be safe to load at this point since we are in the
// REGISTER_BEAN phase
Class configClass = ClassUtils.forName(
methodMetadata.getDeclaringClassName(), context.getClassLoader());
ReflectionUtils.doWithMethods(configClass, new MethodCallback() {
@Override
public void doWith(Method method)
throws IllegalArgumentException, IllegalAccessException {
if (methodMetadata.getMethodName().equals(method.getName())) {
beanTypes.add(method.getReturnType().getName());
}
}
});
}
catch (Throwable ex) {
throw new BeanTypeDeductionException(
methodMetadata.getDeclaringClassName(),
methodMetadata.getMethodName(), ex);
}
}
public SearchStrategy getStrategy() {
return (this.strategy != null ? this.strategy : SearchStrategy.ALL);
}
public List getNames() {
return this.names;
}
public List getTypes() {
return this.types;
}
public List getAnnotations() {
return this.annotations;
}
public List getIgnoredTypes() {
return this.ignoredTypes;
}
@Override
public String toString() {
StringBuilder string = new StringBuilder();
string.append("(");
if (!this.names.isEmpty()) {
string.append("names: ");
string.append(StringUtils.collectionToCommaDelimitedString(this.names));
if (!this.types.isEmpty()) {
string.append("; ");
}
}
if (!this.types.isEmpty()) {
string.append("types: ");
string.append(StringUtils.collectionToCommaDelimitedString(this.types));
}
string.append("; SearchStrategy: ");
string.append(this.strategy.toString().toLowerCase());
string.append(")");
return string.toString();
}
}
private static class SingleCandidateBeanSearchSpec extends BeanSearchSpec {
SingleCandidateBeanSearchSpec(ConditionContext context,
AnnotatedTypeMetadata metadata, Class annotationType) {
super(context, metadata, annotationType);
}
@Override
protected void collect(MultiValueMap attributes, String key,
List destination) {
super.collect(attributes, key, destination);
destination.removeAll(Arrays.asList("", Object.class.getName()));
}
@Override
protected void validate(BeanTypeDeductionException ex) {
Assert.isTrue(getTypes().size() == 1, annotationName() + " annotations must "
+ "specify only one type (got " + getTypes() + ")");
}
}
static final class BeanTypeDeductionException extends RuntimeException {
private BeanTypeDeductionException(String className, String beanMethodName,
Throwable cause) {
super("Failed to deduce bean type for " + className + "." + beanMethodName,
cause);
}
}
}
