spring LazySingletonAspectInstanceFactoryDecorator 源码
spring LazySingletonAspectInstanceFactoryDecorator 代码
文件路径：/spring-aop/src/main/java/org/springframework/aop/aspectj/annotation/LazySingletonAspectInstanceFactoryDecorator.java
/*
* Copyright 2002-2017 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.aop.aspectj.annotation;
import java.io.Serializable;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* Decorator to cause a {@link MetadataAwareAspectInstanceFactory} to instantiate only once.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @since 2.0
*/
@SuppressWarnings("serial")
public class LazySingletonAspectInstanceFactoryDecorator implements MetadataAwareAspectInstanceFactory, Serializable {
private final MetadataAwareAspectInstanceFactory maaif;
@Nullable
private volatile Object materialized;
/**
* Create a new lazily initializing decorator for the given AspectInstanceFactory.
* @param maaif the MetadataAwareAspectInstanceFactory to decorate
*/
public LazySingletonAspectInstanceFactoryDecorator(MetadataAwareAspectInstanceFactory maaif) {
Assert.notNull(maaif, "AspectInstanceFactory must not be null");
this.maaif = maaif;
}
@Override
public Object getAspectInstance() {
Object aspectInstance = this.materialized;
if (aspectInstance == null) {
Object mutex = this.maaif.getAspectCreationMutex();
if (mutex == null) {
aspectInstance = this.maaif.getAspectInstance();
this.materialized = aspectInstance;
}
else {
synchronized (mutex) {
aspectInstance = this.materialized;
if (aspectInstance == null) {
aspectInstance = this.maaif.getAspectInstance();
this.materialized = aspectInstance;
}
}
}
}
return aspectInstance;
}
public boolean isMaterialized() {
return (this.materialized != null);
}
@Override
@Nullable
public ClassLoader getAspectClassLoader() {
return this.maaif.getAspectClassLoader();
}
@Override
public AspectMetadata getAspectMetadata() {
return this.maaif.getAspectMetadata();
}
@Override
@Nullable
public Object getAspectCreationMutex() {
return this.maaif.getAspectCreationMutex();
}
@Override
public int getOrder() {
return this.maaif.getOrder();
}
@Override
public String toString() {
return "LazySingletonAspectInstanceFactoryDecorator: decorating " + this.maaif;
}
}
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