/*
* Copyright 2002-2005 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
*
* http://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.framework;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.aop.support.DelegatingIntroductionInterceptor;
/**
* Mixin to provide stateful locking functionality.
* Test/demonstration of AOP mixin support rather than a
* useful interceptor in its own right.
*
* @author Rod Johnson
* @since 10.07.2003
*/
public class LockMixin extends DelegatingIntroductionInterceptor implements Lockable {
/** This field demonstrates additional state in the mixin */
private boolean locked;
public void lock() {
this.locked = true;
}
public void unlock() {
this.locked = false;
}
/**
* @see org.springframework.aop.framework.AopProxyTests.Lockable#locked()
*/
public boolean locked() {
return this.locked;
}
/**
* Note that we need to override around advice.
* If the method is a setter and we're locked, prevent execution.
* Otherwise let super.invoke() handle it, and do normal
* Lockable(this) then target behaviour.
* @see org.aopalliance.MethodInterceptor#invoke(org.aopalliance.MethodInvocation)
*/
public Object invoke(MethodInvocation invocation) throws Throwable {
if (locked() && invocation.getMethod().getName().indexOf("set") == 0)
throw new LockedException();
return super.invoke(invocation);
}
}