spring SingletonTargetSource 源码
spring SingletonTargetSource 代码
文件路径：/spring-aop/src/main/java/org/springframework/aop/target/SingletonTargetSource.java
/*
* Copyright 2002-2021 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.target;
import java.io.Serializable;
import org.springframework.aop.TargetSource;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
/**
* Implementation of the {@link org.springframework.aop.TargetSource} interface
* that holds a given object. This is the default implementation of the TargetSource
* interface, as used by the Spring AOP framework. There is usually no need to
* create objects of this class in application code.
*
* <p>This class is serializable. However, the actual serializability of a
* SingletonTargetSource will depend on whether the target is serializable.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @see org.springframework.aop.framework.AdvisedSupport#setTarget(Object)
*/
public class SingletonTargetSource implements TargetSource, Serializable {
/** use serialVersionUID from Spring 1.2 for interoperability. */
private static final long serialVersionUID = 9031246629662423738L;
/** Target cached and invoked using reflection. */
private final Object target;
/**
* Create a new SingletonTargetSource for the given target.
* @param target the target object
*/
public SingletonTargetSource(Object target) {
Assert.notNull(target, "Target object must not be null");
this.target = target;
}
@Override
public Class<?> getTargetClass() {
return this.target.getClass();
}
@Override
public Object getTarget() {
return this.target;
}
@Override
public void releaseTarget(Object target) {
// nothing to do
}
@Override
public boolean isStatic() {
return true;
}
/**
* Two invoker interceptors are equal if they have the same target or if the
* targets or the targets are equal.
*/
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (!(other instanceof SingletonTargetSource otherTargetSource)) {
return false;
}
return this.target.equals(otherTargetSource.target);
}
/**
* SingletonTargetSource uses the hash code of the target object.
*/
@Override
public int hashCode() {
return this.target.hashCode();
}
@Override
public String toString() {
return "SingletonTargetSource for target object [" + ObjectUtils.identityToString(this.target) + "]";
}
}
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