AOP爲Aspect Oriented Programming的縮寫,意爲:面向切面編程,經過預編譯方式和運行期動態代理實現程序功能的統一維護的一種技術。AOP是OOP的延續,是軟件開發中的一個熱點,也是Spring框架中的一個重要內容,是函數式編程的一種衍生範型。利用AOP能夠對業務邏輯的各個部分進行隔離,從而使得業務邏輯各部分之間的耦合度下降,提升程序的可重用性,同時提升了開發的效率。java
主要用在公共業務上,例如:
android
classpath 'com.hujiang.aspectjx:gradle-android-plugin-aspectjx:2.0.4'
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apply plugin: 'android-aspectjx'
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api 'org.aspectj:aspectjrt:1.8.9'
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@Target({ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
public @interface ClickLimit {
int value() default 500;
}
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@Aspect
public class ClickLimitAspect {
private static final int CHECK_FOR_DEFAULT_TIME = 500;
private static final String POINTCUT_ON_ANNOTATION =
"execution(@com.xuetian.xtuikit.click.annotation.ClickLimit * *(..))";
@Pointcut(POINTCUT_ON_ANNOTATION)
public void onAnnotationClick(){}
@Around("onAnnotationClick()")
public void processJoinPoint(ProceedingJoinPoint joinPoint) throws Throwable {
try {
Signature signature = joinPoint.getSignature();
if (!(signature instanceof MethodSignature)){
joinPoint.proceed();
return;
}
MethodSignature methodSignature = (MethodSignature) signature;
Method method = methodSignature.getMethod();
boolean isHasLimitAnnotation = method.isAnnotationPresent(ClickLimit.class);
String methodName = method.getName();
int intervalTime = CHECK_FOR_DEFAULT_TIME;
if (isHasLimitAnnotation){
ClickLimit clickLimit = method.getAnnotation(ClickLimit.class);
int limitTime = clickLimit.value();
if (limitTime <= 0){
joinPoint.proceed();
return;
}
intervalTime = limitTime;
}
Object[] args = joinPoint.getArgs();
View view = getViewFromArgs(args);
if (view == null) {
joinPoint.proceed();
return;
}
Object viewTimeTag = view.getTag(R.integer.xt_click_limit_tag_view);
if (viewTimeTag == null){
proceedAnSetTimeTag(joinPoint, view);
return;
}
long lastClickTime = (long) viewTimeTag;
if (lastClickTime <= 0){
proceedAnSetTimeTag(joinPoint, view);
return;
}
if (!canClick(lastClickTime, intervalTime)){
return;
}
proceedAnSetTimeTag(joinPoint, view);
} catch (Throwable e) {
e.printStackTrace();
joinPoint.proceed();
}
}
public void proceedAnSetTimeTag(ProceedingJoinPoint joinPoint, View view) throws Throwable {
view.setTag(R.integer.xt_click_limit_tag_view, System.currentTimeMillis());
joinPoint.proceed();
}
public View getViewFromArgs(Object[] args) {
if (args != null && args.length > 0) {
Object arg = args[0];
if (arg instanceof View) {
return (View) arg;
}
}
return null;
}
public boolean canClick(long lastClickTime, int intervalTime) {
long currentTime = System.currentTimeMillis();
long realIntervalTime = currentTime - lastClickTime;
return realIntervalTime >= intervalTime;
}
}
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