这是一个示例，如何使用StopWatch通过注释专用方法来设置多个测量。 使用非常有用和非常简单的方法来测量例如多个embedded式呼叫/操作的服务呼叫等等。

StopWatchHierarchy

package ch.vii.spring.aop; import java.util.Arrays; import org.aopalliance.intercept.MethodInterceptor; import org.aopalliance.intercept.MethodInvocation; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.stereotype.Component; import org.springframework.util.StopWatch; @Component public class ProfilingMethodInterceptor implements MethodInterceptor { private static final Logger log = LoggerFactory.getLogger(ProfilingMethodInterceptor.class); public Object invoke(MethodInvocation invocation) throws Throwable { if (log.isInfoEnabled()) { String stopWatchName = invocation.getMethod().toGenericString(); StopWatchHierarchy stopWatch = StopWatchHierarchy.getStopWatchHierarchy(stopWatchName); String taskName = invocation.getMethod().getName(); stopWatch.start(taskName); try { return invocation.proceed(); } finally { stopWatch.stop(); } } else { return invocation.proceed(); } } static class StopWatchHierarchy { private static final ThreadLocal stopwatchLocal = new ThreadLocal(); private static final IndentStack indentStack = new IndentStack(); static StopWatchHierarchy getStopWatchHierarchy(String id) { StopWatchHierarchy stopWatch = stopwatchLocal.get(); if (stopWatch == null) { stopWatch = new StopWatchHierarchy(id); stopwatchLocal.set(stopWatch); } return stopWatch; } static void reset() { stopwatchLocal.set(null); } final StopWatch stopWatch; final Stack stack; StopWatchHierarchy(String id) { stopWatch = new StopWatch(id); stack = new Stack(); } void start(String taskName) { if (stopWatch.isRunning()) { stopWatch.stop(); } taskName = indentStack.get(stack.size) + taskName; stack.push(taskName); stopWatch.start(taskName); } void stop() { stopWatch.stop(); stack.pop(); if (stack.isEmpty()) { log.info(stopWatch.prettyPrint()); StopWatchHierarchy.reset(); } else { stopWatch.start(stack.get()); } } } static class Stack { private int size = 0; String elements[]; public Stack() { elements = new String[10]; } public void push(String e) { if (size == elements.length) { ensureCapa(); } elements[size++] = e; } public String pop() { String e = elements[--size]; elements[size] = null; return e; } public String get() { return elements[size - 1]; } public boolean isEmpty() { return size == 0; } private void ensureCapa() { int newSize = elements.length * 2; elements = Arrays.copyOf(elements, newSize); } } static class IndentStack { String elements[] = new String[0]; public String get(int index) { if (index >= elements.length) { ensureCapa(index + 10); } return elements[index]; } private void ensureCapa(int newSize) { int oldSize = elements.length; elements = Arrays.copyOf(elements, newSize); for (int i = oldSize; i < elements.length; i++) { elements[i] = new String(new char[i]).replace("\0", "| "); } } } }

顾问

package ch.vii.spring.aop; import java.lang.reflect.Method; import org.aopalliance.aop.Advice; import org.springframework.aop.Pointcut; import org.springframework.aop.support.AbstractPointcutAdvisor; import org.springframework.aop.support.StaticMethodMatcherPointcut; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; @Component public class ProfilingAdvisor extends AbstractPointcutAdvisor { private static final long serialVersionUID = 1L; private final StaticMethodMatcherPointcut pointcut = new StaticMethodMatcherPointcut() { public boolean matches(Method method, Class> targetClass) { return method.isAnnotationPresent(ProfileExecution.class); } }; @Autowired private ProfilingMethodInterceptor interceptor; public Pointcut getPointcut() { return this.pointcut; } public Advice getAdvice() { return this.interceptor; } }

ProfileExecution注释

package ch.vii.spring.aop; import java.lang.annotation.ElementType; import java.lang.annotation.Inherited; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.METHOD) @Inherited public @interface ProfileExecution { }

注释你的代码

package ch.vii.spring; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import ch.vii.spring.aop.ProfileExecution; @Component public class Bean { @Autowired InnerBean innerBean; @ProfileExecution public void foo() { innerBean.innerFoo(); innerBean.innerFoo2(); innerBean.innerFoo(); } } public class InnerBean { @Autowired InnerInnerBean innerInnerBean; @ProfileExecution public void innerFoo() { } @ProfileExecution public void innerFoo2() { innerInnerBean.innerInnerFoo(); innerInnerBean.innerInnerFoo(); innerInnerBean.innerInnerFoo(); } }

产量

09:58:39.627 [main] INFO cvsaop.ProfilingMethodInterceptor - StopWatch 'public void ch.vii.spring.Bean.foo()': running time (millis) = 215 ----------------------------------------- ms % Task name ----------------------------------------- 00018 008 % foo 00026 012 % | innerFoo 00001 000 % foo 00016 007 % | innerFoo2 00038 018 % | | innerInnerFoo 00000 000 % | innerFoo2 00024 011 % | | innerInnerFoo 00028 013 % | innerFoo2 00024 011 % | | innerInnerFoo 00029 013 % | innerFoo2 00000 000 % foo 00011 005 % | innerFoo 00000 000 % foo