java根据环境变量或属性执行切入点

1 周，5 日 Questions & Answers 2844

我开发了一个不错的Spring Aspect，可以用来监控我的服务操作性能。如果执行某些操作需要很长时间，它会记录这些操作

@Aspect
public class PerformanceMonitorAspect {

    private Logger logger = LoggerFactory.getLogger("performance");

    @Pointcut("execution(* com.company.MyService+.*(..))")
    public void pointCut(){

    }

    @Around("pointCut()")
    public Object profileServiceMethods(ProceedingJoinPoint thisJoinPoint) throws Throwable {
        MethodSignature ms = (MethodSignature) thisJoinPoint.getSignature();
        Method m = ms.getMethod();
        long t1 = System.nanoTime();
        Object result = thisJoinPoint.proceed();
        long t2 = System.nanoTime();
        long millis = TimeUnit.NANOSECONDS.toMillis(t2 - t1);
        if (millis < 1000) {
            logger.trace("Execution time for {}: {} ms", m.getName(), millis);
        } else {
            logger.warn("Substantial execution time for {}: {} ms", m.getName(),
                    millis);
        }
        return result;
    }

}

然而，由于它是一个@Around建议，Spring控制了我所有的方法调用，以便对它们进行分析。调试时这有点不舒服（它甚至误导了Eclipse本身），所以我希望切入点只在应用程序处于生产阶段时执行。我可以根据环境变量、Java属性或类似属性将切入点配置为有条件地执行吗

Documentation仅指方法变量条件。。。提前谢谢

编辑

根据@DavidL的建议，我将切入点改为：

@Pointcut("execution(* com.tadic.module.TadicModuleGeneric+.*(..)) && if()")
public static boolean pointCut() {
    return true;
}

这就是Eclipse不发出任何警告的方式。然而，我在运行时得到了以下结果：

GRAVE: Critical error during deployment: 
java.lang.VerifyError: Expecting a stackmap frame at branch target 7
Exception Details:
  Location:
    com/mycompany/aspects/AuditAspect.<clinit>()V @1: invokestatic
  Reason:
    Expected stackmap frame at this location.
  Bytecode:
    0000000: 00b8 0134 a700 084b 2ab3 012f b1       
  Exception Handler Table:
    bci [1, 7] => handler: 7

    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2615)
    at java.lang.Class.getDeclaredMethods(Class.java:1860)
    at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:474)
    at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:458)
    at org.springframework.util.ReflectionUtils.getUniqueDeclaredMethods(ReflectionUtils.java:518)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryMethod(AbstractAutowireCapableBeanFactory.java:639)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:575)
    at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1350)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:355)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:326)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:434)
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:624)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:461)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:410)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4973)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

看来织工做得不好。有什么建议吗

编辑2 当我通过基于Spring AOP代理的方面使用AspectJ时，就会出现这个问题。我正在使用Maven构建这个项目，并使用Eclipse AspectJ插件将其集成到我的工作区中。AspectJ版本是1.8.2，Spring AOP版本是3.2.8。我正在用Java7.0.75JDK构建它

以下是正在使用的POM示例：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.tesicnor.test</groupId>
    <artifactId>aspect-test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>aspect-test</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
        <aspectj.version>1.8.2</aspectj.version>
    </properties>

    <build>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>aspectj-maven-plugin</artifactId>
                <version>1.7</version>
                <configuration>
                    <complianceLevel>1.7</complianceLevel>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

    <dependencies>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>${aspectj.version}</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>${aspectj.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>3.2.8.RELEASE</version>
        </dependency>
    </dependencies>


</project>

这个POM是我创建的一个功能测试用例的POM。我目前的项目规模很大，似乎还有其他依赖性造成了麻烦

# 2 楼答案

终于，我成功了。似乎Eclipse在我的类路径中造成了一些混乱，导致了上述问题。我删除了aspectjweaver，根据@DavidL的答案，我可以获得以下代码：

@Aspect
public class PerformanceMonitorAspect {

    /**
     * Decide whether the Pointcut to be executed or not
     */
    private static boolean enabled;

    @Pointcut("execution(* com.company.MyService+.*(..)) && if()")
    public static boolean pointCut() {
        return enabled;
    }

    private Logger logger = LoggerFactory.getLogger("performance");

    @Around("pointCut()")
    public Object profileServiceMethods(ProceedingJoinPoint thisJoinPoint) throws Throwable {
        MethodSignature ms = (MethodSignature) thisJoinPoint.getSignature();
        Method m = ms.getMethod();
        long t1 = System.nanoTime();
        Object result = thisJoinPoint.proceed();
        long t2 = System.nanoTime();
        long millis = TimeUnit.NANOSECONDS.toMillis(t2 - t1);
        if (millis < 1000) {
            logger.trace("Execution time for {}: {} ms", m.getName(), millis);
        } else {
            logger.warn("Substantial execution time for {}: {} ms", m.getName(),
                    millis);
        }
        return result;
    }

    //The value is retrieved by Spring having read a config file written by Maven, depending on the profile
    @Value("${enable.performance.monitor}")
    public void setEnabled(boolean value) {
        enabled = value;
    }

}

然后，让Spring来管理这个方面：

<bean class="com.tadic.aspects.PerformanceMonitorAspect" factory-method="aspectOf" />

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java根据环境变量或属性执行切入点

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