spring SingletonAspectInstanceFactory 源码
spring SingletonAspectInstanceFactory 代码
文件路径：/spring-aop/src/main/java/org/springframework/aop/aspectj/SingletonAspectInstanceFactory.java
/*
* Copyright 2002-2015 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;
import java.io.Serializable;
import org.springframework.core.Ordered;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* Implementation of {@link AspectInstanceFactory} that is backed by a
* specified singleton object, returning the same instance for every
* {@link #getAspectInstance()} call.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @since 2.0
* @see SimpleAspectInstanceFactory
*/
@SuppressWarnings("serial")
public class SingletonAspectInstanceFactory implements AspectInstanceFactory, Serializable {
private final Object aspectInstance;
/**
* Create a new SingletonAspectInstanceFactory for the given aspect instance.
* @param aspectInstance the singleton aspect instance
*/
public SingletonAspectInstanceFactory(Object aspectInstance) {
Assert.notNull(aspectInstance, "Aspect instance must not be null");
this.aspectInstance = aspectInstance;
}
@Override
public final Object getAspectInstance() {
return this.aspectInstance;
}
@Override
@Nullable
public ClassLoader getAspectClassLoader() {
return this.aspectInstance.getClass().getClassLoader();
}
/**
* Determine the order for this factory's aspect instance,
* either an instance-specific order expressed through implementing
* the {@link org.springframework.core.Ordered} interface,
* or a fallback order.
* @see org.springframework.core.Ordered
* @see #getOrderForAspectClass
*/
@Override
public int getOrder() {
if (this.aspectInstance instanceof Ordered) {
return ((Ordered) this.aspectInstance).getOrder();
}
return getOrderForAspectClass(this.aspectInstance.getClass());
}
/**
* Determine a fallback order for the case that the aspect instance
* does not express an instance-specific order through implementing
* the {@link org.springframework.core.Ordered} interface.
* <p>The default implementation simply returns {@code Ordered.LOWEST_PRECEDENCE}.
* @param aspectClass the aspect class
*/
protected int getOrderForAspectClass(Class<?> aspectClass) {
return Ordered.LOWEST_PRECEDENCE;
}
}
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