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/*
* Copyright 2012-2020 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
*
* 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 org.springframework.boot.autoconfigure.condition;
import java.security.AccessControlException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.springframework.boot.autoconfigure.AutoConfigurationImportFilter;
import org.springframework.boot.autoconfigure.AutoConfigurationMetadata;
import org.springframework.boot.autoconfigure.condition.ConditionMessage.Style;
import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.core.type.AnnotatedTypeMetadata;
import org.springframework.util.MultiValueMap;
import org.springframework.util.StringUtils;
/**
* {@link Condition} and {@link AutoConfigurationImportFilter} that checks for the
* presence or absence of specific classes.
*
* @author Phillip Webb
* @see ConditionalOnClass
* @see ConditionalOnMissingClass
*/
@Order(Ordered.HIGHEST_PRECEDENCE)
class OnClassCondition extends FilteringSpringBootCondition {
@Override
protected final ConditionOutcome[] getOutcomes(String[] autoConfigurationClasses,
AutoConfigurationMetadata autoConfigurationMetadata) {
// Split the work and perform half in a background thread if more than one
// processor is available. Using a single additional thread seems to offer the
// best performance. More threads make things worse.
if (autoConfigurationClasses.length > 1 && Runtime.getRuntime().availableProcessors() > 1) {
return resolveOutcomesThreaded(autoConfigurationClasses, autoConfigurationMetadata);
}
else {
OutcomesResolver outcomesResolver = new StandardOutcomesResolver(autoConfigurationClasses, 0,
autoConfigurationClasses.length, autoConfigurationMetadata, getBeanClassLoader());
return outcomesResolver.resolveOutcomes();
}
}
private ConditionOutcome[] resolveOutcomesThreaded(String[] autoConfigurationClasses,
AutoConfigurationMetadata autoConfigurationMetadata) {
int split = autoConfigurationClasses.length / 2;
OutcomesResolver firstHalfResolver = createOutcomesResolver(autoConfigurationClasses, 0, split,
autoConfigurationMetadata);
OutcomesResolver secondHalfResolver = new StandardOutcomesResolver(autoConfigurationClasses, split,
autoConfigurationClasses.length, autoConfigurationMetadata, getBeanClassLoader());
ConditionOutcome[] secondHalf = secondHalfResolver.resolveOutcomes();
ConditionOutcome[] firstHalf = firstHalfResolver.resolveOutcomes();
ConditionOutcome[] outcomes = new ConditionOutcome[autoConfigurationClasses.length];
System.arraycopy(firstHalf, 0, outcomes, 0, firstHalf.length);
System.arraycopy(secondHalf, 0, outcomes, split, secondHalf.length);
return outcomes;
}
private OutcomesResolver createOutcomesResolver(String[] autoConfigurationClasses, int start, int end,
AutoConfigurationMetadata autoConfigurationMetadata) {
OutcomesResolver outcomesResolver = new StandardOutcomesResolver(autoConfigurationClasses, start, end,
autoConfigurationMetadata, getBeanClassLoader());
try {
return new ThreadedOutcomesResolver(outcomesResolver);
}
catch (AccessControlException ex) {
return outcomesResolver;
}
}
@Override
public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
ClassLoader classLoader = context.getClassLoader();
ConditionMessage matchMessage = ConditionMessage.empty();
List onClasses = getCandidates(metadata, ConditionalOnClass.class);
if (onClasses != null) {
List missing = filter(onClasses, ClassNameFilter.MISSING, classLoader);
if (!missing.isEmpty()) {
return ConditionOutcome.noMatch(ConditionMessage.forCondition(ConditionalOnClass.class)
.didNotFind("required class", "required classes").items(Style.QUOTE, missing));
}
matchMessage = matchMessage.andCondition(ConditionalOnClass.class)
.found("required class", "required classes")
.items(Style.QUOTE, filter(onClasses, ClassNameFilter.PRESENT, classLoader));
}
List onMissingClasses = getCandidates(metadata, ConditionalOnMissingClass.class);
if (onMissingClasses != null) {
List present = filter(onMissingClasses, ClassNameFilter.PRESENT, classLoader);
if (!present.isEmpty()) {
return ConditionOutcome.noMatch(ConditionMessage.forCondition(ConditionalOnMissingClass.class)
.found("unwanted class", "unwanted classes").items(Style.QUOTE, present));
}
matchMessage = matchMessage.andCondition(ConditionalOnMissingClass.class)
.didNotFind("unwanted class", "unwanted classes")
.items(Style.QUOTE, filter(onMissingClasses, ClassNameFilter.MISSING, classLoader));
}
return ConditionOutcome.match(matchMessage);
}
private List getCandidates(AnnotatedTypeMetadata metadata, Class annotationType) {
MultiValueMap attributes = metadata.getAllAnnotationAttributes(annotationType.getName(), true);
if (attributes == null) {
return null;
}
List candidates = new ArrayList<>();
addAll(candidates, attributes.get("value"));
addAll(candidates, attributes.get("name"));
return candidates;
}
private void addAll(List list, List
