?? usagelogaspect.java
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/*
* Copyright 2002-2006 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.samples.petclinic.aspects;
import java.util.ArrayList;
import java.util.List;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
/**
* Sample AspectJ annotation-style aspect that saves
* every owner name requested to the clinic.
*
* @author Rod Johnson
* @since 2.0
*/
@Aspect
public class UsageLogAspect {
private int historySize = 100;
// Of course saving all names is not suitable for
// production use, but this is a simple sample
private List<String> namesRequested = new ArrayList<String>(historySize);
public void setHistorySize(int historySize) {
this.historySize = historySize;
namesRequested = new ArrayList<String>(historySize);
}
@Before("execution(* *.findOwners(String)) && args(name)")
public synchronized void logNameRequest(String name) {
// Not the most efficient implementation,
// but we're aiming to illustrate the power of
// @AspectJ AOP, not write perfect code here :-)
if (namesRequested.size() > historySize) {
namesRequested.remove(0);
}
namesRequested.add(name);
}
public List<String> getNamesRequested() {
return namesRequested;
}
}
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