/*
* 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.aop.interceptor;
import com.jamonapi.Monitor;
import com.jamonapi.MonitorFactory;
import org.aopalliance.intercept.MethodInvocation;
import org.apache.commons.logging.Log;
/**
* Performance monitor interceptor that uses <b>JAMon</b> library
* to perform the performance measurement on the intercepted method
* and output the stats.
*
* <p>This code is inspired by Thierry Templier's blog.
*
* @author Dmitriy Kopylenko
* @author Juergen Hoeller
* @author Rob Harrop
* @since 1.1.3
* @see com.jamonapi.MonitorFactory
* @see PerformanceMonitorInterceptor
*/
public class JamonPerformanceMonitorInterceptor extends AbstractMonitoringInterceptor {
private boolean trackAllInvocations = false;
/**
* Create a new JamonPerformanceMonitorInterceptor with a static logger.
*/
public JamonPerformanceMonitorInterceptor() {
}
/**
* Create a new JamonPerformanceMonitorInterceptor with a dynamic or static logger,
* according to the given flag.
* @param useDynamicLogger whether to use a dynamic logger or a static logger
* @see #setUseDynamicLogger
*/
public JamonPerformanceMonitorInterceptor(boolean useDynamicLogger) {
setUseDynamicLogger(useDynamicLogger);
}
/**
* Create a new JamonPerformanceMonitorInterceptor with a dynamic or static logger,
* according to the given flag.
* @param useDynamicLogger whether to use a dynamic logger or a static logger
* @param trackAllInvocations whether to track all invocations that go through
* this interceptor, or just invocations with trace logging enabled
* @see #setUseDynamicLogger
*/
public JamonPerformanceMonitorInterceptor(boolean useDynamicLogger, boolean trackAllInvocations) {
setUseDynamicLogger(useDynamicLogger);
setTrackAllInvocations(trackAllInvocations);
}
/**
* Set whether to track all invocations that go through this interceptor,
* or just invocations with trace logging enabled.
* <p>Default is "false": Only invocations with trace logging enabled will
* be monitored. Specify "true" to let JAMon track all invocations,
* gathering statistics even when trace logging is disabled.
*/
public void setTrackAllInvocations(boolean trackAllInvocations) {
this.trackAllInvocations = trackAllInvocations;
}
/**
* Always applies the interceptor if the "trackAllInvocations" flag has been set;
* else just kicks in if the log is enabled.
* @see #setTrackAllInvocations
* @see #isLogEnabled
*/
@Override
protected boolean isInterceptorEnabled(MethodInvocation invocation, Log logger) {
return (this.trackAllInvocations || isLogEnabled(logger));
}
/**
* Wraps the invocation with a JAMon Monitor and writes the current
* performance statistics to the log (if enabled).
* @see com.jamonapi.MonitorFactory#start
* @see com.jamonapi.Monitor#stop
*/
@Override
protected Object invokeUnderTrace(MethodInvocation invocation, Log logger) throws Throwable {
String name = createInvocationTraceName(invocation);
Monitor monitor = MonitorFactory.start(name);
try {
return invocation.proceed();
}
finally {
monitor.stop();
if (!this.trackAllInvocations || isLogEnabled(logger)) {
logger.trace("JAMon performance statistics for method [" + name + "]:\n" + monitor);
}
}
}
}