001/*
002 * Copyright 2002-2016 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.aop.aspectj.annotation;
018
019import java.io.Serializable;
020
021import org.springframework.aop.aspectj.SingletonAspectInstanceFactory;
022import org.springframework.core.Ordered;
023import org.springframework.core.annotation.OrderUtils;
024
025/**
026 * Implementation of {@link MetadataAwareAspectInstanceFactory} that is backed
027 * by a specified singleton object, returning the same instance for every
028 * {@link #getAspectInstance()} call.
029 *
030 * @author Rod Johnson
031 * @author Juergen Hoeller
032 * @since 2.0
033 * @see SimpleMetadataAwareAspectInstanceFactory
034 */
035@SuppressWarnings("serial")
036public class SingletonMetadataAwareAspectInstanceFactory extends SingletonAspectInstanceFactory
037                implements MetadataAwareAspectInstanceFactory, Serializable {
038
039        private final AspectMetadata metadata;
040
041
042        /**
043         * Create a new SingletonMetadataAwareAspectInstanceFactory for the given aspect.
044         * @param aspectInstance the singleton aspect instance
045         * @param aspectName the name of the aspect
046         */
047        public SingletonMetadataAwareAspectInstanceFactory(Object aspectInstance, String aspectName) {
048                super(aspectInstance);
049                this.metadata = new AspectMetadata(aspectInstance.getClass(), aspectName);
050        }
051
052
053        @Override
054        public final AspectMetadata getAspectMetadata() {
055                return this.metadata;
056        }
057
058        @Override
059        public Object getAspectCreationMutex() {
060                return this;
061        }
062
063        @Override
064        protected int getOrderForAspectClass(Class<?> aspectClass) {
065                return OrderUtils.getOrder(aspectClass, Ordered.LOWEST_PRECEDENCE);
066        }
067
068}