/*
 * Copyright 2002-2020 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
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package org.springframework.scheduling.annotation;

import java.util.Collection;
import java.util.concurrent.Executor;
import java.util.function.Supplier;

import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
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;

Abstract base Configuration class providing common structure for enabling Spring's asynchronous method execution capability.
Author:Chris Beams, Juergen Hoeller, Stephane Nicoll
See Also:
Since:3.1
/** * 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> executor; @Nullable protected Supplier<AsyncUncaughtExceptionHandler> exceptionHandler; @Override public void setImportMetadata(AnnotationMetadata importMetadata) { this.enableAsync = AnnotationAttributes.fromMap( importMetadata.getAnnotationAttributes(EnableAsync.class.getName(), false)); if (this.enableAsync == null) { throw new IllegalArgumentException( "@EnableAsync is not present on importing class " + importMetadata.getClassName()); } }
Collect any AsyncConfigurer beans through autowiring.
/** * Collect any {@link AsyncConfigurer} beans through autowiring. */
@Autowired(required = false) void setConfigurers(Collection<AsyncConfigurer> configurers) { if (CollectionUtils.isEmpty(configurers)) { return; } if (configurers.size() > 1) { throw new IllegalStateException("Only one AsyncConfigurer may exist"); } AsyncConfigurer configurer = configurers.iterator().next(); this.executor = configurer::getAsyncExecutor; this.exceptionHandler = configurer::getAsyncUncaughtExceptionHandler; } }