//1、聲明注解
public @interface SystemLog {}

//2、查看指令
javap -v SystemLog.class

//3、打印結(jié)果
Compiled from "SystemLog.java"
public interface com.base.test.SystemLog extends java.lang.annotation.Annotation

@Documented
@Inherited
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface SystemLog { String model () default "" ; }

public class LogInfo {
    @SystemLog(model = "日志模塊")
    public static void main(String[] args) {
        // 生成代理文件
        System.getProperties().put("sun.misc.ProxyGenerator.saveGeneratedFiles", "true");
        // 反射機(jī)制
        Method[] methods = LogInfo.class.getMethods();
        for (Method method:methods){
            SystemLog systemLog = method.getAnnotation(SystemLog.class) ;
            if (systemLog != null){
                // 動(dòng)態(tài)代理：com.sun.proxy.$Proxy2
                System.out.println(systemLog.getClass().getName());
                System.out.println(systemLog.model());
            }
        }
    }
}

public final class $Proxy2 extends Proxy implements SystemLog {
    public final String model() throws  {
        try {
            return (String)super.h.invoke(this, m3, (Object[])null);
        } catch (RuntimeException | Error var2) {
            throw var2;
        } catch (Throwable var3) {
            throw new UndeclaredThrowableException(var3);
        }
    }
}

@Data
@AllArgsConstructor
@NoArgsConstructor
public class IdKey {
    private Integer id ;
    private String key ;

    public static void main(String[] args) {
        IdKey idKey01 = new IdKey(1,"cicada") ;
        System.out.println(idKey01);
        idKey01.setId(2);
        idKey01.setKey("smile");
        System.out.println(idKey01);
    }
}

//1、Lombok處理器
@SupportedAnnotationTypes("*")
public class LombokProcessor extends AbstractProcessor {
    private JavacTransformer transformer;
    @Override
    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
         transformer.transform(prio, javacProcessingEnv.getContext(), cusForThisRound, cleanup);
    }
}

//2、AST抽象樹
public class JavacTransformer {
    public void transform(long priority, Context context, List<JCTree.JCCompilationUnit> compilationUnits,
                          CleanupRegistry cleanup) {
        JavacAST ast = new JavacAST(messager, context, unit, cleanup);
        ast.traverse(new AnnotationVisitor(priority));
        handlers.callASTVisitors(ast, priority);
    }
}

// 3、注解處理抽象類
public abstract class JavacAnnotationHandler<T extends Annotation> {
    public abstract void handle(AnnotationValues<T> annotation, JCAnnotation ast, JavacNode annotationNode);
}

//4、Getter注解處理
public class HandleGetter extends JavacAnnotationHandler<Getter> {
    @Override 
    public void handle(AnnotationValues<Getter> annotation, JCTree.JCAnnotation ast, JavacNode annotationNode) {
        JavacNode node = annotationNode.up();
        List<JCTree.JCAnnotation> onMethod = unboxAndRemoveAnnotationParameter(ast, "onMethod", "@Getter(onMethod", annotationNode);
        switch (node.getKind()) {
            case FIELD:
                createGetterForFields(level, fields, annotationNode, true, lazy, onMethod);
                break;
        }
    }
}

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface SyncLock {
    String lockKey();           // 鎖的Key
    int time () default 3000 ;  // 有效時(shí)間
    int retryNum () default 3 ; // 重試次數(shù)
}

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface BizType {
    EsIndexEnum esIndexEnum () ;        // ES索引解析適配
    MySqlTableEnum mySqlTableEnum () ;  // MySQL表解析適配
    ExcelEnum excelEnum () ;            // Excel解析適配
}