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/*
* Copyright 2002-2022 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.scheduling.annotation;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.function.Function;
import java.util.function.Supplier;
import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportAware;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.lang.Nullable;
import org.springframework.util.CollectionUtils;
import org.springframework.util.function.SingletonSupplier;
/**
* Abstract base {@code Configuration} class providing common structure for enabling
* Spring's asynchronous method execution capability.
*
* @author Chris Beams
* @author Juergen Hoeller
* @author Stephane Nicoll
* @since 3.1
* @see EnableAsync
*/
@Configuration(proxyBeanMethods = false)
public abstract class AbstractAsyncConfiguration implements ImportAware {
@Nullable
protected AnnotationAttributes enableAsync;
@Nullable
protected Supplier executor;
@Nullable
protected Supplier exceptionHandler;
@Override
public void setImportMetadata(AnnotationMetadata importMetadata) {
this.enableAsync = AnnotationAttributes.fromMap(
importMetadata.getAnnotationAttributes(EnableAsync.class.getName()));
if (this.enableAsync == null) {
throw new IllegalArgumentException(
"@EnableAsync is not present on importing class " + importMetadata.getClassName());
}
}
/**
* Collect any {@link AsyncConfigurer} beans through autowiring.
*/
@Autowired
void setConfigurers(ObjectProvider configurers) {
Supplier configurer = SingletonSupplier.of(() -> {
List candidates = configurers.stream().toList();
if (CollectionUtils.isEmpty(candidates)) {
return null;
}
if (candidates.size() > 1) {
throw new IllegalStateException("Only one AsyncConfigurer may exist");
}
return candidates.get(0);
});
this.executor = adapt(configurer, AsyncConfigurer::getAsyncExecutor);
this.exceptionHandler = adapt(configurer, AsyncConfigurer::getAsyncUncaughtExceptionHandler);
}
private Supplier adapt(Supplier supplier, Function provider) {
return () -> {
AsyncConfigurer configurer = supplier.get();
return (configurer != null ? provider.apply(configurer) : null);
};
}
}
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