001/*
002 * Copyright 2002-2018 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.scheduling.annotation;
018
019import org.springframework.context.annotation.AdviceMode;
020import org.springframework.context.annotation.AdviceModeImportSelector;
021import org.springframework.lang.Nullable;
022
023/**
024 * Selects which implementation of {@link AbstractAsyncConfiguration} should
025 * be used based on the value of {@link EnableAsync#mode} on the importing
026 * {@code @Configuration} class.
027 *
028 * @author Chris Beams
029 * @author Juergen Hoeller
030 * @since 3.1
031 * @see EnableAsync
032 * @see ProxyAsyncConfiguration
033 */
034public class AsyncConfigurationSelector extends AdviceModeImportSelector<EnableAsync> {
035
036        private static final String ASYNC_EXECUTION_ASPECT_CONFIGURATION_CLASS_NAME =
037                        "org.springframework.scheduling.aspectj.AspectJAsyncConfiguration";
038
039
040        /**
041         * Returns {@link ProxyAsyncConfiguration} or {@code AspectJAsyncConfiguration}
042         * for {@code PROXY} and {@code ASPECTJ} values of {@link EnableAsync#mode()},
043         * respectively.
044         */
045        @Override
046        @Nullable
047        public String[] selectImports(AdviceMode adviceMode) {
048                switch (adviceMode) {
049                        case PROXY:
050                                return new String[] {ProxyAsyncConfiguration.class.getName()};
051                        case ASPECTJ:
052                                return new String[] {ASYNC_EXECUTION_ASPECT_CONFIGURATION_CLASS_NAME};
053                        default:
054                                return null;
055                }
056        }
057
058}