案例:
public interface ForumService { void removeTopic(int topicId); void removeForum(int forumId); }
对相关方法进行性能监控
public class ForumServiceImpl implements ForumService { public void removeTopic(int topicId) { // PerformanceMonitor.begin("com.hand.proxy.ForumServiceImpl.removeTopic"); System.out.println("模拟删除Topic记录:" + topicId); try { Thread.sleep(20); } catch (InterruptedException e) { e.printStackTrace(); } // PerformanceMonitor.end(); } public void removeForum(int forumId) { // PerformanceMonitor.begin("com.hand.proxy.ForumServiceImpl.removeForum"); System.out.println("模拟删除Forum记录:" + forumId); try { Thread.sleep(20); } catch (InterruptedException e) { e.printStackTrace(); } // PerformanceMonitor.end(); } }
性能监控实现类:
public class PerformanceMonitor { // 通过一个ThreadLocal保存与调用线程相关的性能监视信息 private static ThreadLocal<MethodPerformance> performanceRecord = new ThreadLocal<MethodPerformance>(); // 启动对某一目标方法的性能监视 public static void begin(String method) { System.out.println("begin monitor..."); MethodPerformance mp = new MethodPerformance(method); performanceRecord.set(mp); } public static void end() { System.out.println("end monitor..."); MethodPerformance mp = performanceRecord.get(); // 打印出方法性能监视的结果信息 mp.printPerformance(); } }
用于记录性能监控信息:
public class PerformanceMonitor { // 通过一个ThreadLocal保存与调用线程相关的性能监视信息 private static ThreadLocal<MethodPerformance> performanceRecord = new ThreadLocal<MethodPerformance>(); // 启动对某一目标方法的性能监视 public static void begin(String method) { System.out.println("begin monitor..."); MethodPerformance mp = new MethodPerformance(method); performanceRecord.set(mp); } public static void end() { System.out.println("end monitor..."); MethodPerformance mp = performanceRecord.get(); // 打印出方法性能监视的结果信息 mp.printPerformance(); } }
1、JDK动态代理
public class PerformanceMonitor { // 通过一个ThreadLocal保存与调用线程相关的性能监视信息 private static ThreadLocal<MethodPerformance> performanceRecord = new ThreadLocal<MethodPerformance>(); // 启动对某一目标方法的性能监视 public static void begin(String method) { System.out.println("begin monitor..."); MethodPerformance mp = new MethodPerformance(method); performanceRecord.set(mp); } public static void end() { System.out.println("end monitor..."); MethodPerformance mp = performanceRecord.get(); // 打印出方法性能监视的结果信息 mp.printPerformance(); } }
public class ForumServiceTest { @Test public void proxy() { ForumService forumService = new ForumServiceImpl(); PerformanceHandler handler = new PerformanceHandler(forumService); ForumService proxy = (ForumService) Proxy.newProxyInstance(forumService.getClass().getClassLoader(), forumService.getClass().getInterfaces(), handler); proxy.removeForum(10); proxy.removeTopic(1012); } }
得到以下输出信息:
begin monitor...
模拟删除Forum记录:10
end monitor...
com.hand.proxy.ForumServiceImpl.removeForum花费21毫秒
begin monitor...
模拟删除Topic记录:1012
end monitor...
com.hand.proxy.ForumServiceImpl.removeTopic花费21毫秒
2、CGLib动态代理
<!-- https://mvnrepository.com/artifact/cglib/cglib --> <dependency> <groupId>cglib</groupId> <artifactId>cglib</artifactId> <version>2.2.2</version> </dependency>
public class CglibProxy implements MethodInterceptor { private Enhancer enhancer = new Enhancer(); public Object getProxy(Class clazz) { enhancer.setSuperclass(clazz); enhancer.setCallback(this); return enhancer.create(); } public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable { PerformanceMonitor.begin(obj.getClass().getName() + "." + method.getName()); Object result = proxy.invokeSuper(obj, args); PerformanceMonitor.end(); return result; } }
public class ForumServiceTest2 { @Test public void proxy() { CglibProxy proxy = new CglibProxy(); ForumServiceImpl forumService = (ForumServiceImpl) proxy.getProxy(ForumServiceImpl.class); forumService.removeForum(10); forumService.removeTopic(1023); } }
1)、JDK和CGLib的区别
2)、Spring在选择用JDK还是CGLib的依据
3)、JDK和CGLib的性能对比
总结
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