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CallMonitoringAspect.java
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CallMonitoringAspect.java
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/*
* Copyright 2002-2013 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.util;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.jmx.export.annotation.ManagedAttribute;
import org.springframework.jmx.export.annotation.ManagedOperation;
import org.springframework.jmx.export.annotation.ManagedResource;
import org.springframework.util.StopWatch;
/**
* Simple aspect that monitors call count and call invocation time. It uses JMX annotations and therefore can be
* monitored using any JMX console such as the jConsole
* <p/>
* This is only useful if you use JPA or JDBC. Spring-data-jpa doesn't have any correctly annotated classes to join on
*
* @author Rob Harrop
* @author Juergen Hoeller
* @author Michael Isvy
* @since 2.5
*/
@ManagedResource("petclinic:type=CallMonitor")
@Aspect
public class CallMonitoringAspect {
private boolean enabled = true;
private int callCount = 0;
private long accumulatedCallTime = 0;
@ManagedAttribute
public boolean isEnabled() {
return enabled;
}
@ManagedAttribute
public void setEnabled(boolean enabled) {
this.enabled = enabled;
}
@ManagedOperation
public void reset() {
this.callCount = 0;
this.accumulatedCallTime = 0;
}
@ManagedAttribute
public int getCallCount() {
return callCount;
}
@ManagedAttribute
public long getCallTime() {
if (this.callCount > 0)
return this.accumulatedCallTime / this.callCount;
else
return 0;
}
@Around("within(@org.springframework.stereotype.Repository *)")
public Object invoke(ProceedingJoinPoint joinPoint) throws Throwable {
if (this.enabled) {
StopWatch sw = new StopWatch(joinPoint.toShortString());
sw.start("invoke");
try {
return joinPoint.proceed();
} finally {
sw.stop();
synchronized (this) {
this.callCount++;
this.accumulatedCallTime += sw.getTotalTimeMillis();
}
}
} else {
return joinPoint.proceed();
}
}
}