Admin: 1 версия

2010-06-01T06:16:21Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:44Z

Новая страница

== AfterReturningAdvice Demo ==



<source lang="java">
File: Main.java
import org.springframework.aop.Advisor;
import org.springframework.aop.aspectj.AspectJExpressionPointcut;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.aop.support.DefaultPointcutAdvisor;
import bean.MyClass;
import bean.SimpleAfterAdvice;
public class Main {
public static void main(String[] args) {
MyClass target = new MyClass();
AspectJExpressionPointcut pc = new AspectJExpressionPointcut();
pc.setExpression("execution(* bean..*.get*(..))");
Advisor advisor = new DefaultPointcutAdvisor(pc, new SimpleAfterAdvice());
ProxyFactory pf = new ProxyFactory();
pf.setTarget(target);
pf.addAdvisor(advisor);
MyClass proxy = (MyClass) pf.getProxy();
System.out.println(proxy.getName());
proxy.setName("New Name");
System.out.println(proxy.getHeight());
}
}
File: MyClass.java
package bean;

public class MyClass {
public String getName() {
return "AAA";
}
public void setName(String name) {
}
public int getHeight() {
return 201;
}
}

File: SimpleAfterAdvice.java
package bean;
import org.springframework.aop.AfterReturningAdvice;
import java.lang.reflect.Method;

public class SimpleAfterAdvice implements AfterReturningAdvice{
public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable {
System.out.println("After method: " + method);
}
}

</source>



== Check Logic In AfterReturningAdvice ==



<source lang="java">

File: Main.java
import java.lang.reflect.Method;
import org.springframework.aop.AfterReturningAdvice;
import org.springframework.aop.framework.ProxyFactory;
public class Main {
public static void main(String[] args) {
KeyGenerator target = new KeyGenerator();
ProxyFactory factory = new ProxyFactory();
factory.setTarget(target);
factory.addAdvice(new WeakKeyCheckAdvice());
KeyGenerator keyGen = (KeyGenerator) factory.getProxy();
System.out.println("Key: " + keyGen.getKey());
}
}
class KeyGenerator {
public static final long WEAK_KEY = 1L;
public static final long STRONG_KEY = 2L;
public long getKey() {
return WEAK_KEY;
// return STRONG_KEY;
}
}
class WeakKeyCheckAdvice implements AfterReturningAdvice {
public void afterReturning(Object returnValue, Method method, Object[] args, Object target)
throws Throwable {
if ((target instanceof KeyGenerator) && ("getKey".equals(method.getName()))) {
long key = (Long) returnValue;
if (key == KeyGenerator.WEAK_KEY) {
System.out.println("a weak key");
}
}
}
}

</source>



== DefaultPointcutAdvisor and AfterReturningAdvice ==



<source lang="java">
File: Main.java
import org.springframework.aop.Advisor;
import org.springframework.aop.aspectj.AspectJExpressionPointcut;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.aop.support.DefaultPointcutAdvisor;
import bean.MyClass;
import bean.SimpleAfterAdvice;
public class Main {
public static void main(String[] args) {
MyClass target = new MyClass();
AspectJExpressionPointcut pc = new AspectJExpressionPointcut();
pc.setExpression("execution(* bean..*.get*(..))");
Advisor advisor = new DefaultPointcutAdvisor(pc, new SimpleAfterAdvice());
ProxyFactory pf = new ProxyFactory();
pf.setTarget(target);
pf.addAdvisor(advisor);
MyClass proxy = (MyClass) pf.getProxy();
System.out.println(proxy.getName());
proxy.setName("New Name");
System.out.println(proxy.getHeight());
}
}
File: MyClass.java
package bean;

public class MyClass {
public String getName() {
return "AAA";
}
public void setName(String name) {
}
public int getHeight() {
return 201;
}
}

File: SimpleAfterAdvice.java
package bean;
import org.springframework.aop.AfterReturningAdvice;
import java.lang.reflect.Method;

public class SimpleAfterAdvice implements AfterReturningAdvice{
public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable {
System.out.println("After method: " + method);
}
}

</source>



== implements AfterReturningAdvice ==



<source lang="java">

File: Main.java
import java.lang.reflect.Method;
import org.springframework.aop.AfterReturningAdvice;
import org.springframework.aop.framework.ProxyFactory;
public class Main {
public static void main(String[] args) throws Exception {
MessageWriter target = new MessageWriter();
// create the proxy
ProxyFactory pf = new ProxyFactory();
pf.addAdvice(new SimpleAfterReturningAdvice());
pf.setTarget(target);
MessageWriter proxy = (MessageWriter) pf.getProxy();
// write the messages
proxy.writeMessage();
}
}
class MessageWriter {
public void writeMessage() {
System.out.println("A");
}
}
class SimpleAfterReturningAdvice implements AfterReturningAdvice {
public void afterReturning(Object returnValue, Method method, Object[] args,
Object target) throws Throwable {
System.out.println("After method: " + method.getName());
}
}

</source>

← Предыдущая	Версия 06:16, 1 июня 2010
(нет различий)

Java/Spring/AfterReturningAdvice - История изменений

Admin: 1 версия

в 18:01, 31 мая 2010